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![Guillaume Nault](/assets/img/avatar_default.png)
The sk_getsecid hook shouldn't need to modify its socket argument. Make it const so that callers of security_sk_classify_flow() can use a const struct sock *. Signed-off-by: Guillaume Nault <gnault@redhat.com> Reviewed-by: Simon Horman <simon.horman@corigine.com> Signed-off-by: David S. Miller <davem@davemloft.net>
5293 lines
150 KiB
C
5293 lines
150 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Security plug functions
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*
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* Copyright (C) 2001 WireX Communications, Inc <chris@wirex.com>
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* Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
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* Copyright (C) 2001 Networks Associates Technology, Inc <ssmalley@nai.com>
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* Copyright (C) 2016 Mellanox Technologies
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* Copyright (C) 2023 Microsoft Corporation <paul@paul-moore.com>
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*/
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#define pr_fmt(fmt) "LSM: " fmt
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#include <linux/bpf.h>
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#include <linux/capability.h>
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#include <linux/dcache.h>
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#include <linux/export.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/kernel_read_file.h>
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#include <linux/lsm_hooks.h>
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#include <linux/integrity.h>
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#include <linux/ima.h>
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#include <linux/evm.h>
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#include <linux/fsnotify.h>
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#include <linux/mman.h>
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#include <linux/mount.h>
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#include <linux/personality.h>
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#include <linux/backing-dev.h>
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#include <linux/string.h>
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#include <linux/msg.h>
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#include <net/flow.h>
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#define MAX_LSM_EVM_XATTR 2
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/* How many LSMs were built into the kernel? */
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#define LSM_COUNT (__end_lsm_info - __start_lsm_info)
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/*
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* These are descriptions of the reasons that can be passed to the
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* security_locked_down() LSM hook. Placing this array here allows
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* all security modules to use the same descriptions for auditing
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* purposes.
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*/
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const char *const lockdown_reasons[LOCKDOWN_CONFIDENTIALITY_MAX + 1] = {
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[LOCKDOWN_NONE] = "none",
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[LOCKDOWN_MODULE_SIGNATURE] = "unsigned module loading",
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[LOCKDOWN_DEV_MEM] = "/dev/mem,kmem,port",
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[LOCKDOWN_EFI_TEST] = "/dev/efi_test access",
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[LOCKDOWN_KEXEC] = "kexec of unsigned images",
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[LOCKDOWN_HIBERNATION] = "hibernation",
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[LOCKDOWN_PCI_ACCESS] = "direct PCI access",
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[LOCKDOWN_IOPORT] = "raw io port access",
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[LOCKDOWN_MSR] = "raw MSR access",
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[LOCKDOWN_ACPI_TABLES] = "modifying ACPI tables",
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[LOCKDOWN_DEVICE_TREE] = "modifying device tree contents",
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[LOCKDOWN_PCMCIA_CIS] = "direct PCMCIA CIS storage",
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[LOCKDOWN_TIOCSSERIAL] = "reconfiguration of serial port IO",
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[LOCKDOWN_MODULE_PARAMETERS] = "unsafe module parameters",
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[LOCKDOWN_MMIOTRACE] = "unsafe mmio",
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[LOCKDOWN_DEBUGFS] = "debugfs access",
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[LOCKDOWN_XMON_WR] = "xmon write access",
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[LOCKDOWN_BPF_WRITE_USER] = "use of bpf to write user RAM",
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[LOCKDOWN_DBG_WRITE_KERNEL] = "use of kgdb/kdb to write kernel RAM",
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[LOCKDOWN_RTAS_ERROR_INJECTION] = "RTAS error injection",
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[LOCKDOWN_INTEGRITY_MAX] = "integrity",
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[LOCKDOWN_KCORE] = "/proc/kcore access",
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[LOCKDOWN_KPROBES] = "use of kprobes",
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[LOCKDOWN_BPF_READ_KERNEL] = "use of bpf to read kernel RAM",
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[LOCKDOWN_DBG_READ_KERNEL] = "use of kgdb/kdb to read kernel RAM",
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[LOCKDOWN_PERF] = "unsafe use of perf",
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[LOCKDOWN_TRACEFS] = "use of tracefs",
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[LOCKDOWN_XMON_RW] = "xmon read and write access",
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[LOCKDOWN_XFRM_SECRET] = "xfrm SA secret",
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[LOCKDOWN_CONFIDENTIALITY_MAX] = "confidentiality",
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};
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struct security_hook_heads security_hook_heads __ro_after_init;
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static BLOCKING_NOTIFIER_HEAD(blocking_lsm_notifier_chain);
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static struct kmem_cache *lsm_file_cache;
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static struct kmem_cache *lsm_inode_cache;
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char *lsm_names;
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static struct lsm_blob_sizes blob_sizes __ro_after_init;
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/* Boot-time LSM user choice */
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static __initdata const char *chosen_lsm_order;
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static __initdata const char *chosen_major_lsm;
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static __initconst const char *const builtin_lsm_order = CONFIG_LSM;
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/* Ordered list of LSMs to initialize. */
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static __initdata struct lsm_info **ordered_lsms;
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static __initdata struct lsm_info *exclusive;
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static __initdata bool debug;
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#define init_debug(...) \
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do { \
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if (debug) \
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pr_info(__VA_ARGS__); \
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} while (0)
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static bool __init is_enabled(struct lsm_info *lsm)
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{
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if (!lsm->enabled)
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return false;
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return *lsm->enabled;
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}
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/* Mark an LSM's enabled flag. */
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static int lsm_enabled_true __initdata = 1;
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static int lsm_enabled_false __initdata = 0;
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static void __init set_enabled(struct lsm_info *lsm, bool enabled)
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{
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/*
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* When an LSM hasn't configured an enable variable, we can use
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* a hard-coded location for storing the default enabled state.
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*/
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if (!lsm->enabled) {
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if (enabled)
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lsm->enabled = &lsm_enabled_true;
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else
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lsm->enabled = &lsm_enabled_false;
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} else if (lsm->enabled == &lsm_enabled_true) {
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if (!enabled)
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lsm->enabled = &lsm_enabled_false;
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} else if (lsm->enabled == &lsm_enabled_false) {
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if (enabled)
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lsm->enabled = &lsm_enabled_true;
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} else {
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*lsm->enabled = enabled;
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}
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}
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/* Is an LSM already listed in the ordered LSMs list? */
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static bool __init exists_ordered_lsm(struct lsm_info *lsm)
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{
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struct lsm_info **check;
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for (check = ordered_lsms; *check; check++)
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if (*check == lsm)
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return true;
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return false;
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}
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/* Append an LSM to the list of ordered LSMs to initialize. */
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static int last_lsm __initdata;
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static void __init append_ordered_lsm(struct lsm_info *lsm, const char *from)
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{
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/* Ignore duplicate selections. */
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if (exists_ordered_lsm(lsm))
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return;
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if (WARN(last_lsm == LSM_COUNT, "%s: out of LSM slots!?\n", from))
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return;
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/* Enable this LSM, if it is not already set. */
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if (!lsm->enabled)
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lsm->enabled = &lsm_enabled_true;
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ordered_lsms[last_lsm++] = lsm;
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init_debug("%s ordered: %s (%s)\n", from, lsm->name,
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is_enabled(lsm) ? "enabled" : "disabled");
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}
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/* Is an LSM allowed to be initialized? */
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static bool __init lsm_allowed(struct lsm_info *lsm)
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{
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/* Skip if the LSM is disabled. */
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if (!is_enabled(lsm))
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return false;
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/* Not allowed if another exclusive LSM already initialized. */
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if ((lsm->flags & LSM_FLAG_EXCLUSIVE) && exclusive) {
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init_debug("exclusive disabled: %s\n", lsm->name);
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return false;
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}
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return true;
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}
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static void __init lsm_set_blob_size(int *need, int *lbs)
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{
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int offset;
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if (*need <= 0)
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return;
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offset = ALIGN(*lbs, sizeof(void *));
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*lbs = offset + *need;
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*need = offset;
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}
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static void __init lsm_set_blob_sizes(struct lsm_blob_sizes *needed)
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{
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if (!needed)
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return;
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lsm_set_blob_size(&needed->lbs_cred, &blob_sizes.lbs_cred);
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lsm_set_blob_size(&needed->lbs_file, &blob_sizes.lbs_file);
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/*
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* The inode blob gets an rcu_head in addition to
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* what the modules might need.
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*/
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if (needed->lbs_inode && blob_sizes.lbs_inode == 0)
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blob_sizes.lbs_inode = sizeof(struct rcu_head);
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lsm_set_blob_size(&needed->lbs_inode, &blob_sizes.lbs_inode);
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lsm_set_blob_size(&needed->lbs_ipc, &blob_sizes.lbs_ipc);
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lsm_set_blob_size(&needed->lbs_msg_msg, &blob_sizes.lbs_msg_msg);
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lsm_set_blob_size(&needed->lbs_superblock, &blob_sizes.lbs_superblock);
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lsm_set_blob_size(&needed->lbs_task, &blob_sizes.lbs_task);
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}
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/* Prepare LSM for initialization. */
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static void __init prepare_lsm(struct lsm_info *lsm)
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{
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int enabled = lsm_allowed(lsm);
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/* Record enablement (to handle any following exclusive LSMs). */
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set_enabled(lsm, enabled);
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/* If enabled, do pre-initialization work. */
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if (enabled) {
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if ((lsm->flags & LSM_FLAG_EXCLUSIVE) && !exclusive) {
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exclusive = lsm;
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init_debug("exclusive chosen: %s\n", lsm->name);
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}
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lsm_set_blob_sizes(lsm->blobs);
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}
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}
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/* Initialize a given LSM, if it is enabled. */
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static void __init initialize_lsm(struct lsm_info *lsm)
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{
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if (is_enabled(lsm)) {
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int ret;
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init_debug("initializing %s\n", lsm->name);
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ret = lsm->init();
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WARN(ret, "%s failed to initialize: %d\n", lsm->name, ret);
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}
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}
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/* Populate ordered LSMs list from comma-separated LSM name list. */
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static void __init ordered_lsm_parse(const char *order, const char *origin)
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{
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struct lsm_info *lsm;
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char *sep, *name, *next;
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/* LSM_ORDER_FIRST is always first. */
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for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
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if (lsm->order == LSM_ORDER_FIRST)
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append_ordered_lsm(lsm, " first");
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}
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/* Process "security=", if given. */
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if (chosen_major_lsm) {
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struct lsm_info *major;
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/*
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* To match the original "security=" behavior, this
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* explicitly does NOT fallback to another Legacy Major
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* if the selected one was separately disabled: disable
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* all non-matching Legacy Major LSMs.
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*/
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for (major = __start_lsm_info; major < __end_lsm_info;
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major++) {
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if ((major->flags & LSM_FLAG_LEGACY_MAJOR) &&
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strcmp(major->name, chosen_major_lsm) != 0) {
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set_enabled(major, false);
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init_debug("security=%s disabled: %s (only one legacy major LSM)\n",
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chosen_major_lsm, major->name);
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}
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}
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}
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sep = kstrdup(order, GFP_KERNEL);
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next = sep;
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/* Walk the list, looking for matching LSMs. */
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while ((name = strsep(&next, ",")) != NULL) {
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bool found = false;
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for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
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if (strcmp(lsm->name, name) == 0) {
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if (lsm->order == LSM_ORDER_MUTABLE)
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append_ordered_lsm(lsm, origin);
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found = true;
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}
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}
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if (!found)
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init_debug("%s ignored: %s (not built into kernel)\n",
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origin, name);
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}
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/* Process "security=", if given. */
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if (chosen_major_lsm) {
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for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
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if (exists_ordered_lsm(lsm))
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continue;
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if (strcmp(lsm->name, chosen_major_lsm) == 0)
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append_ordered_lsm(lsm, "security=");
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}
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}
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/* LSM_ORDER_LAST is always last. */
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for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
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if (lsm->order == LSM_ORDER_LAST)
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append_ordered_lsm(lsm, " last");
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}
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/* Disable all LSMs not in the ordered list. */
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for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
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if (exists_ordered_lsm(lsm))
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continue;
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set_enabled(lsm, false);
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init_debug("%s skipped: %s (not in requested order)\n",
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origin, lsm->name);
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}
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kfree(sep);
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}
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static void __init lsm_early_cred(struct cred *cred);
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static void __init lsm_early_task(struct task_struct *task);
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static int lsm_append(const char *new, char **result);
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static void __init report_lsm_order(void)
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{
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struct lsm_info **lsm, *early;
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int first = 0;
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pr_info("initializing lsm=");
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/* Report each enabled LSM name, comma separated. */
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for (early = __start_early_lsm_info;
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early < __end_early_lsm_info; early++)
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if (is_enabled(early))
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pr_cont("%s%s", first++ == 0 ? "" : ",", early->name);
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for (lsm = ordered_lsms; *lsm; lsm++)
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if (is_enabled(*lsm))
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pr_cont("%s%s", first++ == 0 ? "" : ",", (*lsm)->name);
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pr_cont("\n");
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}
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static void __init ordered_lsm_init(void)
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{
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struct lsm_info **lsm;
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ordered_lsms = kcalloc(LSM_COUNT + 1, sizeof(*ordered_lsms),
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GFP_KERNEL);
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if (chosen_lsm_order) {
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if (chosen_major_lsm) {
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pr_warn("security=%s is ignored because it is superseded by lsm=%s\n",
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chosen_major_lsm, chosen_lsm_order);
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chosen_major_lsm = NULL;
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}
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ordered_lsm_parse(chosen_lsm_order, "cmdline");
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} else
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ordered_lsm_parse(builtin_lsm_order, "builtin");
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for (lsm = ordered_lsms; *lsm; lsm++)
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prepare_lsm(*lsm);
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report_lsm_order();
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init_debug("cred blob size = %d\n", blob_sizes.lbs_cred);
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init_debug("file blob size = %d\n", blob_sizes.lbs_file);
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init_debug("inode blob size = %d\n", blob_sizes.lbs_inode);
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init_debug("ipc blob size = %d\n", blob_sizes.lbs_ipc);
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init_debug("msg_msg blob size = %d\n", blob_sizes.lbs_msg_msg);
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init_debug("superblock blob size = %d\n", blob_sizes.lbs_superblock);
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init_debug("task blob size = %d\n", blob_sizes.lbs_task);
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/*
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* Create any kmem_caches needed for blobs
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*/
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if (blob_sizes.lbs_file)
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lsm_file_cache = kmem_cache_create("lsm_file_cache",
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blob_sizes.lbs_file, 0,
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SLAB_PANIC, NULL);
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if (blob_sizes.lbs_inode)
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lsm_inode_cache = kmem_cache_create("lsm_inode_cache",
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blob_sizes.lbs_inode, 0,
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SLAB_PANIC, NULL);
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lsm_early_cred((struct cred *) current->cred);
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lsm_early_task(current);
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for (lsm = ordered_lsms; *lsm; lsm++)
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initialize_lsm(*lsm);
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kfree(ordered_lsms);
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}
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int __init early_security_init(void)
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{
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struct lsm_info *lsm;
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#define LSM_HOOK(RET, DEFAULT, NAME, ...) \
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INIT_HLIST_HEAD(&security_hook_heads.NAME);
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#include "linux/lsm_hook_defs.h"
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#undef LSM_HOOK
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for (lsm = __start_early_lsm_info; lsm < __end_early_lsm_info; lsm++) {
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if (!lsm->enabled)
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lsm->enabled = &lsm_enabled_true;
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prepare_lsm(lsm);
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initialize_lsm(lsm);
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}
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return 0;
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}
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/**
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* security_init - initializes the security framework
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*
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* This should be called early in the kernel initialization sequence.
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*/
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int __init security_init(void)
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{
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struct lsm_info *lsm;
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init_debug("legacy security=%s\n", chosen_major_lsm ? : " *unspecified*");
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init_debug(" CONFIG_LSM=%s\n", builtin_lsm_order);
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init_debug("boot arg lsm=%s\n", chosen_lsm_order ? : " *unspecified*");
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/*
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* Append the names of the early LSM modules now that kmalloc() is
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* available
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*/
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for (lsm = __start_early_lsm_info; lsm < __end_early_lsm_info; lsm++) {
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init_debug(" early started: %s (%s)\n", lsm->name,
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is_enabled(lsm) ? "enabled" : "disabled");
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if (lsm->enabled)
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lsm_append(lsm->name, &lsm_names);
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}
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/* Load LSMs in specified order. */
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ordered_lsm_init();
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return 0;
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}
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/* Save user chosen LSM */
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static int __init choose_major_lsm(char *str)
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{
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chosen_major_lsm = str;
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return 1;
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}
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__setup("security=", choose_major_lsm);
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/* Explicitly choose LSM initialization order. */
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static int __init choose_lsm_order(char *str)
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{
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chosen_lsm_order = str;
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return 1;
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}
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__setup("lsm=", choose_lsm_order);
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/* Enable LSM order debugging. */
|
|
static int __init enable_debug(char *str)
|
|
{
|
|
debug = true;
|
|
return 1;
|
|
}
|
|
__setup("lsm.debug", enable_debug);
|
|
|
|
static bool match_last_lsm(const char *list, const char *lsm)
|
|
{
|
|
const char *last;
|
|
|
|
if (WARN_ON(!list || !lsm))
|
|
return false;
|
|
last = strrchr(list, ',');
|
|
if (last)
|
|
/* Pass the comma, strcmp() will check for '\0' */
|
|
last++;
|
|
else
|
|
last = list;
|
|
return !strcmp(last, lsm);
|
|
}
|
|
|
|
static int lsm_append(const char *new, char **result)
|
|
{
|
|
char *cp;
|
|
|
|
if (*result == NULL) {
|
|
*result = kstrdup(new, GFP_KERNEL);
|
|
if (*result == NULL)
|
|
return -ENOMEM;
|
|
} else {
|
|
/* Check if it is the last registered name */
|
|
if (match_last_lsm(*result, new))
|
|
return 0;
|
|
cp = kasprintf(GFP_KERNEL, "%s,%s", *result, new);
|
|
if (cp == NULL)
|
|
return -ENOMEM;
|
|
kfree(*result);
|
|
*result = cp;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* security_add_hooks - Add a modules hooks to the hook lists.
|
|
* @hooks: the hooks to add
|
|
* @count: the number of hooks to add
|
|
* @lsm: the name of the security module
|
|
*
|
|
* Each LSM has to register its hooks with the infrastructure.
|
|
*/
|
|
void __init security_add_hooks(struct security_hook_list *hooks, int count,
|
|
const char *lsm)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < count; i++) {
|
|
hooks[i].lsm = lsm;
|
|
hlist_add_tail_rcu(&hooks[i].list, hooks[i].head);
|
|
}
|
|
|
|
/*
|
|
* Don't try to append during early_security_init(), we'll come back
|
|
* and fix this up afterwards.
|
|
*/
|
|
if (slab_is_available()) {
|
|
if (lsm_append(lsm, &lsm_names) < 0)
|
|
panic("%s - Cannot get early memory.\n", __func__);
|
|
}
|
|
}
|
|
|
|
int call_blocking_lsm_notifier(enum lsm_event event, void *data)
|
|
{
|
|
return blocking_notifier_call_chain(&blocking_lsm_notifier_chain,
|
|
event, data);
|
|
}
|
|
EXPORT_SYMBOL(call_blocking_lsm_notifier);
|
|
|
|
int register_blocking_lsm_notifier(struct notifier_block *nb)
|
|
{
|
|
return blocking_notifier_chain_register(&blocking_lsm_notifier_chain,
|
|
nb);
|
|
}
|
|
EXPORT_SYMBOL(register_blocking_lsm_notifier);
|
|
|
|
int unregister_blocking_lsm_notifier(struct notifier_block *nb)
|
|
{
|
|
return blocking_notifier_chain_unregister(&blocking_lsm_notifier_chain,
|
|
nb);
|
|
}
|
|
EXPORT_SYMBOL(unregister_blocking_lsm_notifier);
|
|
|
|
/**
|
|
* lsm_cred_alloc - allocate a composite cred blob
|
|
* @cred: the cred that needs a blob
|
|
* @gfp: allocation type
|
|
*
|
|
* Allocate the cred blob for all the modules
|
|
*
|
|
* Returns 0, or -ENOMEM if memory can't be allocated.
|
|
*/
|
|
static int lsm_cred_alloc(struct cred *cred, gfp_t gfp)
|
|
{
|
|
if (blob_sizes.lbs_cred == 0) {
|
|
cred->security = NULL;
|
|
return 0;
|
|
}
|
|
|
|
cred->security = kzalloc(blob_sizes.lbs_cred, gfp);
|
|
if (cred->security == NULL)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* lsm_early_cred - during initialization allocate a composite cred blob
|
|
* @cred: the cred that needs a blob
|
|
*
|
|
* Allocate the cred blob for all the modules
|
|
*/
|
|
static void __init lsm_early_cred(struct cred *cred)
|
|
{
|
|
int rc = lsm_cred_alloc(cred, GFP_KERNEL);
|
|
|
|
if (rc)
|
|
panic("%s: Early cred alloc failed.\n", __func__);
|
|
}
|
|
|
|
/**
|
|
* lsm_file_alloc - allocate a composite file blob
|
|
* @file: the file that needs a blob
|
|
*
|
|
* Allocate the file blob for all the modules
|
|
*
|
|
* Returns 0, or -ENOMEM if memory can't be allocated.
|
|
*/
|
|
static int lsm_file_alloc(struct file *file)
|
|
{
|
|
if (!lsm_file_cache) {
|
|
file->f_security = NULL;
|
|
return 0;
|
|
}
|
|
|
|
file->f_security = kmem_cache_zalloc(lsm_file_cache, GFP_KERNEL);
|
|
if (file->f_security == NULL)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* lsm_inode_alloc - allocate a composite inode blob
|
|
* @inode: the inode that needs a blob
|
|
*
|
|
* Allocate the inode blob for all the modules
|
|
*
|
|
* Returns 0, or -ENOMEM if memory can't be allocated.
|
|
*/
|
|
int lsm_inode_alloc(struct inode *inode)
|
|
{
|
|
if (!lsm_inode_cache) {
|
|
inode->i_security = NULL;
|
|
return 0;
|
|
}
|
|
|
|
inode->i_security = kmem_cache_zalloc(lsm_inode_cache, GFP_NOFS);
|
|
if (inode->i_security == NULL)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* lsm_task_alloc - allocate a composite task blob
|
|
* @task: the task that needs a blob
|
|
*
|
|
* Allocate the task blob for all the modules
|
|
*
|
|
* Returns 0, or -ENOMEM if memory can't be allocated.
|
|
*/
|
|
static int lsm_task_alloc(struct task_struct *task)
|
|
{
|
|
if (blob_sizes.lbs_task == 0) {
|
|
task->security = NULL;
|
|
return 0;
|
|
}
|
|
|
|
task->security = kzalloc(blob_sizes.lbs_task, GFP_KERNEL);
|
|
if (task->security == NULL)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* lsm_ipc_alloc - allocate a composite ipc blob
|
|
* @kip: the ipc that needs a blob
|
|
*
|
|
* Allocate the ipc blob for all the modules
|
|
*
|
|
* Returns 0, or -ENOMEM if memory can't be allocated.
|
|
*/
|
|
static int lsm_ipc_alloc(struct kern_ipc_perm *kip)
|
|
{
|
|
if (blob_sizes.lbs_ipc == 0) {
|
|
kip->security = NULL;
|
|
return 0;
|
|
}
|
|
|
|
kip->security = kzalloc(blob_sizes.lbs_ipc, GFP_KERNEL);
|
|
if (kip->security == NULL)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* lsm_msg_msg_alloc - allocate a composite msg_msg blob
|
|
* @mp: the msg_msg that needs a blob
|
|
*
|
|
* Allocate the ipc blob for all the modules
|
|
*
|
|
* Returns 0, or -ENOMEM if memory can't be allocated.
|
|
*/
|
|
static int lsm_msg_msg_alloc(struct msg_msg *mp)
|
|
{
|
|
if (blob_sizes.lbs_msg_msg == 0) {
|
|
mp->security = NULL;
|
|
return 0;
|
|
}
|
|
|
|
mp->security = kzalloc(blob_sizes.lbs_msg_msg, GFP_KERNEL);
|
|
if (mp->security == NULL)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* lsm_early_task - during initialization allocate a composite task blob
|
|
* @task: the task that needs a blob
|
|
*
|
|
* Allocate the task blob for all the modules
|
|
*/
|
|
static void __init lsm_early_task(struct task_struct *task)
|
|
{
|
|
int rc = lsm_task_alloc(task);
|
|
|
|
if (rc)
|
|
panic("%s: Early task alloc failed.\n", __func__);
|
|
}
|
|
|
|
/**
|
|
* lsm_superblock_alloc - allocate a composite superblock blob
|
|
* @sb: the superblock that needs a blob
|
|
*
|
|
* Allocate the superblock blob for all the modules
|
|
*
|
|
* Returns 0, or -ENOMEM if memory can't be allocated.
|
|
*/
|
|
static int lsm_superblock_alloc(struct super_block *sb)
|
|
{
|
|
if (blob_sizes.lbs_superblock == 0) {
|
|
sb->s_security = NULL;
|
|
return 0;
|
|
}
|
|
|
|
sb->s_security = kzalloc(blob_sizes.lbs_superblock, GFP_KERNEL);
|
|
if (sb->s_security == NULL)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The default value of the LSM hook is defined in linux/lsm_hook_defs.h and
|
|
* can be accessed with:
|
|
*
|
|
* LSM_RET_DEFAULT(<hook_name>)
|
|
*
|
|
* The macros below define static constants for the default value of each
|
|
* LSM hook.
|
|
*/
|
|
#define LSM_RET_DEFAULT(NAME) (NAME##_default)
|
|
#define DECLARE_LSM_RET_DEFAULT_void(DEFAULT, NAME)
|
|
#define DECLARE_LSM_RET_DEFAULT_int(DEFAULT, NAME) \
|
|
static const int __maybe_unused LSM_RET_DEFAULT(NAME) = (DEFAULT);
|
|
#define LSM_HOOK(RET, DEFAULT, NAME, ...) \
|
|
DECLARE_LSM_RET_DEFAULT_##RET(DEFAULT, NAME)
|
|
|
|
#include <linux/lsm_hook_defs.h>
|
|
#undef LSM_HOOK
|
|
|
|
/*
|
|
* Hook list operation macros.
|
|
*
|
|
* call_void_hook:
|
|
* This is a hook that does not return a value.
|
|
*
|
|
* call_int_hook:
|
|
* This is a hook that returns a value.
|
|
*/
|
|
|
|
#define call_void_hook(FUNC, ...) \
|
|
do { \
|
|
struct security_hook_list *P; \
|
|
\
|
|
hlist_for_each_entry(P, &security_hook_heads.FUNC, list) \
|
|
P->hook.FUNC(__VA_ARGS__); \
|
|
} while (0)
|
|
|
|
#define call_int_hook(FUNC, IRC, ...) ({ \
|
|
int RC = IRC; \
|
|
do { \
|
|
struct security_hook_list *P; \
|
|
\
|
|
hlist_for_each_entry(P, &security_hook_heads.FUNC, list) { \
|
|
RC = P->hook.FUNC(__VA_ARGS__); \
|
|
if (RC != 0) \
|
|
break; \
|
|
} \
|
|
} while (0); \
|
|
RC; \
|
|
})
|
|
|
|
/* Security operations */
|
|
|
|
/**
|
|
* security_binder_set_context_mgr() - Check if becoming binder ctx mgr is ok
|
|
* @mgr: task credentials of current binder process
|
|
*
|
|
* Check whether @mgr is allowed to be the binder context manager.
|
|
*
|
|
* Return: Return 0 if permission is granted.
|
|
*/
|
|
int security_binder_set_context_mgr(const struct cred *mgr)
|
|
{
|
|
return call_int_hook(binder_set_context_mgr, 0, mgr);
|
|
}
|
|
|
|
/**
|
|
* security_binder_transaction() - Check if a binder transaction is allowed
|
|
* @from: sending process
|
|
* @to: receiving process
|
|
*
|
|
* Check whether @from is allowed to invoke a binder transaction call to @to.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_binder_transaction(const struct cred *from,
|
|
const struct cred *to)
|
|
{
|
|
return call_int_hook(binder_transaction, 0, from, to);
|
|
}
|
|
|
|
/**
|
|
* security_binder_transfer_binder() - Check if a binder transfer is allowed
|
|
* @from: sending process
|
|
* @to: receiving process
|
|
*
|
|
* Check whether @from is allowed to transfer a binder reference to @to.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_binder_transfer_binder(const struct cred *from,
|
|
const struct cred *to)
|
|
{
|
|
return call_int_hook(binder_transfer_binder, 0, from, to);
|
|
}
|
|
|
|
/**
|
|
* security_binder_transfer_file() - Check if a binder file xfer is allowed
|
|
* @from: sending process
|
|
* @to: receiving process
|
|
* @file: file being transferred
|
|
*
|
|
* Check whether @from is allowed to transfer @file to @to.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_binder_transfer_file(const struct cred *from,
|
|
const struct cred *to, struct file *file)
|
|
{
|
|
return call_int_hook(binder_transfer_file, 0, from, to, file);
|
|
}
|
|
|
|
/**
|
|
* security_ptrace_access_check() - Check if tracing is allowed
|
|
* @child: target process
|
|
* @mode: PTRACE_MODE flags
|
|
*
|
|
* Check permission before allowing the current process to trace the @child
|
|
* process. Security modules may also want to perform a process tracing check
|
|
* during an execve in the set_security or apply_creds hooks of tracing check
|
|
* during an execve in the bprm_set_creds hook of binprm_security_ops if the
|
|
* process is being traced and its security attributes would be changed by the
|
|
* execve.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_ptrace_access_check(struct task_struct *child, unsigned int mode)
|
|
{
|
|
return call_int_hook(ptrace_access_check, 0, child, mode);
|
|
}
|
|
|
|
/**
|
|
* security_ptrace_traceme() - Check if tracing is allowed
|
|
* @parent: tracing process
|
|
*
|
|
* Check that the @parent process has sufficient permission to trace the
|
|
* current process before allowing the current process to present itself to the
|
|
* @parent process for tracing.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_ptrace_traceme(struct task_struct *parent)
|
|
{
|
|
return call_int_hook(ptrace_traceme, 0, parent);
|
|
}
|
|
|
|
/**
|
|
* security_capget() - Get the capability sets for a process
|
|
* @target: target process
|
|
* @effective: effective capability set
|
|
* @inheritable: inheritable capability set
|
|
* @permitted: permitted capability set
|
|
*
|
|
* Get the @effective, @inheritable, and @permitted capability sets for the
|
|
* @target process. The hook may also perform permission checking to determine
|
|
* if the current process is allowed to see the capability sets of the @target
|
|
* process.
|
|
*
|
|
* Return: Returns 0 if the capability sets were successfully obtained.
|
|
*/
|
|
int security_capget(struct task_struct *target,
|
|
kernel_cap_t *effective,
|
|
kernel_cap_t *inheritable,
|
|
kernel_cap_t *permitted)
|
|
{
|
|
return call_int_hook(capget, 0, target,
|
|
effective, inheritable, permitted);
|
|
}
|
|
|
|
/**
|
|
* security_capset() - Set the capability sets for a process
|
|
* @new: new credentials for the target process
|
|
* @old: current credentials of the target process
|
|
* @effective: effective capability set
|
|
* @inheritable: inheritable capability set
|
|
* @permitted: permitted capability set
|
|
*
|
|
* Set the @effective, @inheritable, and @permitted capability sets for the
|
|
* current process.
|
|
*
|
|
* Return: Returns 0 and update @new if permission is granted.
|
|
*/
|
|
int security_capset(struct cred *new, const struct cred *old,
|
|
const kernel_cap_t *effective,
|
|
const kernel_cap_t *inheritable,
|
|
const kernel_cap_t *permitted)
|
|
{
|
|
return call_int_hook(capset, 0, new, old,
|
|
effective, inheritable, permitted);
|
|
}
|
|
|
|
/**
|
|
* security_capable() - Check if a process has the necessary capability
|
|
* @cred: credentials to examine
|
|
* @ns: user namespace
|
|
* @cap: capability requested
|
|
* @opts: capability check options
|
|
*
|
|
* Check whether the @tsk process has the @cap capability in the indicated
|
|
* credentials. @cap contains the capability <include/linux/capability.h>.
|
|
* @opts contains options for the capable check <include/linux/security.h>.
|
|
*
|
|
* Return: Returns 0 if the capability is granted.
|
|
*/
|
|
int security_capable(const struct cred *cred,
|
|
struct user_namespace *ns,
|
|
int cap,
|
|
unsigned int opts)
|
|
{
|
|
return call_int_hook(capable, 0, cred, ns, cap, opts);
|
|
}
|
|
|
|
/**
|
|
* security_quotactl() - Check if a quotactl() syscall is allowed for this fs
|
|
* @cmds: commands
|
|
* @type: type
|
|
* @id: id
|
|
* @sb: filesystem
|
|
*
|
|
* Check whether the quotactl syscall is allowed for this @sb.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_quotactl(int cmds, int type, int id, struct super_block *sb)
|
|
{
|
|
return call_int_hook(quotactl, 0, cmds, type, id, sb);
|
|
}
|
|
|
|
/**
|
|
* security_quota_on() - Check if QUOTAON is allowed for a dentry
|
|
* @dentry: dentry
|
|
*
|
|
* Check whether QUOTAON is allowed for @dentry.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_quota_on(struct dentry *dentry)
|
|
{
|
|
return call_int_hook(quota_on, 0, dentry);
|
|
}
|
|
|
|
/**
|
|
* security_syslog() - Check if accessing the kernel message ring is allowed
|
|
* @type: SYSLOG_ACTION_* type
|
|
*
|
|
* Check permission before accessing the kernel message ring or changing
|
|
* logging to the console. See the syslog(2) manual page for an explanation of
|
|
* the @type values.
|
|
*
|
|
* Return: Return 0 if permission is granted.
|
|
*/
|
|
int security_syslog(int type)
|
|
{
|
|
return call_int_hook(syslog, 0, type);
|
|
}
|
|
|
|
/**
|
|
* security_settime64() - Check if changing the system time is allowed
|
|
* @ts: new time
|
|
* @tz: timezone
|
|
*
|
|
* Check permission to change the system time, struct timespec64 is defined in
|
|
* <include/linux/time64.h> and timezone is defined in <include/linux/time.h>.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_settime64(const struct timespec64 *ts, const struct timezone *tz)
|
|
{
|
|
return call_int_hook(settime, 0, ts, tz);
|
|
}
|
|
|
|
/**
|
|
* security_vm_enough_memory_mm() - Check if allocating a new mem map is allowed
|
|
* @mm: mm struct
|
|
* @pages: number of pages
|
|
*
|
|
* Check permissions for allocating a new virtual mapping. If all LSMs return
|
|
* a positive value, __vm_enough_memory() will be called with cap_sys_admin
|
|
* set. If at least one LSM returns 0 or negative, __vm_enough_memory() will be
|
|
* called with cap_sys_admin cleared.
|
|
*
|
|
* Return: Returns 0 if permission is granted by the LSM infrastructure to the
|
|
* caller.
|
|
*/
|
|
int security_vm_enough_memory_mm(struct mm_struct *mm, long pages)
|
|
{
|
|
struct security_hook_list *hp;
|
|
int cap_sys_admin = 1;
|
|
int rc;
|
|
|
|
/*
|
|
* The module will respond with a positive value if
|
|
* it thinks the __vm_enough_memory() call should be
|
|
* made with the cap_sys_admin set. If all of the modules
|
|
* agree that it should be set it will. If any module
|
|
* thinks it should not be set it won't.
|
|
*/
|
|
hlist_for_each_entry(hp, &security_hook_heads.vm_enough_memory, list) {
|
|
rc = hp->hook.vm_enough_memory(mm, pages);
|
|
if (rc <= 0) {
|
|
cap_sys_admin = 0;
|
|
break;
|
|
}
|
|
}
|
|
return __vm_enough_memory(mm, pages, cap_sys_admin);
|
|
}
|
|
|
|
/**
|
|
* security_bprm_creds_for_exec() - Prepare the credentials for exec()
|
|
* @bprm: binary program information
|
|
*
|
|
* If the setup in prepare_exec_creds did not setup @bprm->cred->security
|
|
* properly for executing @bprm->file, update the LSM's portion of
|
|
* @bprm->cred->security to be what commit_creds needs to install for the new
|
|
* program. This hook may also optionally check permissions (e.g. for
|
|
* transitions between security domains). The hook must set @bprm->secureexec
|
|
* to 1 if AT_SECURE should be set to request libc enable secure mode. @bprm
|
|
* contains the linux_binprm structure.
|
|
*
|
|
* Return: Returns 0 if the hook is successful and permission is granted.
|
|
*/
|
|
int security_bprm_creds_for_exec(struct linux_binprm *bprm)
|
|
{
|
|
return call_int_hook(bprm_creds_for_exec, 0, bprm);
|
|
}
|
|
|
|
/**
|
|
* security_bprm_creds_from_file() - Update linux_binprm creds based on file
|
|
* @bprm: binary program information
|
|
* @file: associated file
|
|
*
|
|
* If @file is setpcap, suid, sgid or otherwise marked to change privilege upon
|
|
* exec, update @bprm->cred to reflect that change. This is called after
|
|
* finding the binary that will be executed without an interpreter. This
|
|
* ensures that the credentials will not be derived from a script that the
|
|
* binary will need to reopen, which when reopend may end up being a completely
|
|
* different file. This hook may also optionally check permissions (e.g. for
|
|
* transitions between security domains). The hook must set @bprm->secureexec
|
|
* to 1 if AT_SECURE should be set to request libc enable secure mode. The
|
|
* hook must add to @bprm->per_clear any personality flags that should be
|
|
* cleared from current->personality. @bprm contains the linux_binprm
|
|
* structure.
|
|
*
|
|
* Return: Returns 0 if the hook is successful and permission is granted.
|
|
*/
|
|
int security_bprm_creds_from_file(struct linux_binprm *bprm, struct file *file)
|
|
{
|
|
return call_int_hook(bprm_creds_from_file, 0, bprm, file);
|
|
}
|
|
|
|
/**
|
|
* security_bprm_check() - Mediate binary handler search
|
|
* @bprm: binary program information
|
|
*
|
|
* This hook mediates the point when a search for a binary handler will begin.
|
|
* It allows a check against the @bprm->cred->security value which was set in
|
|
* the preceding creds_for_exec call. The argv list and envp list are reliably
|
|
* available in @bprm. This hook may be called multiple times during a single
|
|
* execve. @bprm contains the linux_binprm structure.
|
|
*
|
|
* Return: Returns 0 if the hook is successful and permission is granted.
|
|
*/
|
|
int security_bprm_check(struct linux_binprm *bprm)
|
|
{
|
|
int ret;
|
|
|
|
ret = call_int_hook(bprm_check_security, 0, bprm);
|
|
if (ret)
|
|
return ret;
|
|
return ima_bprm_check(bprm);
|
|
}
|
|
|
|
/**
|
|
* security_bprm_committing_creds() - Install creds for a process during exec()
|
|
* @bprm: binary program information
|
|
*
|
|
* Prepare to install the new security attributes of a process being
|
|
* transformed by an execve operation, based on the old credentials pointed to
|
|
* by @current->cred and the information set in @bprm->cred by the
|
|
* bprm_creds_for_exec hook. @bprm points to the linux_binprm structure. This
|
|
* hook is a good place to perform state changes on the process such as closing
|
|
* open file descriptors to which access will no longer be granted when the
|
|
* attributes are changed. This is called immediately before commit_creds().
|
|
*/
|
|
void security_bprm_committing_creds(struct linux_binprm *bprm)
|
|
{
|
|
call_void_hook(bprm_committing_creds, bprm);
|
|
}
|
|
|
|
/**
|
|
* security_bprm_committed_creds() - Tidy up after cred install during exec()
|
|
* @bprm: binary program information
|
|
*
|
|
* Tidy up after the installation of the new security attributes of a process
|
|
* being transformed by an execve operation. The new credentials have, by this
|
|
* point, been set to @current->cred. @bprm points to the linux_binprm
|
|
* structure. This hook is a good place to perform state changes on the
|
|
* process such as clearing out non-inheritable signal state. This is called
|
|
* immediately after commit_creds().
|
|
*/
|
|
void security_bprm_committed_creds(struct linux_binprm *bprm)
|
|
{
|
|
call_void_hook(bprm_committed_creds, bprm);
|
|
}
|
|
|
|
/**
|
|
* security_fs_context_dup() - Duplicate a fs_context LSM blob
|
|
* @fc: destination filesystem context
|
|
* @src_fc: source filesystem context
|
|
*
|
|
* Allocate and attach a security structure to sc->security. This pointer is
|
|
* initialised to NULL by the caller. @fc indicates the new filesystem context.
|
|
* @src_fc indicates the original filesystem context.
|
|
*
|
|
* Return: Returns 0 on success or a negative error code on failure.
|
|
*/
|
|
int security_fs_context_dup(struct fs_context *fc, struct fs_context *src_fc)
|
|
{
|
|
return call_int_hook(fs_context_dup, 0, fc, src_fc);
|
|
}
|
|
|
|
/**
|
|
* security_fs_context_parse_param() - Configure a filesystem context
|
|
* @fc: filesystem context
|
|
* @param: filesystem parameter
|
|
*
|
|
* Userspace provided a parameter to configure a superblock. The LSM can
|
|
* consume the parameter or return it to the caller for use elsewhere.
|
|
*
|
|
* Return: If the parameter is used by the LSM it should return 0, if it is
|
|
* returned to the caller -ENOPARAM is returned, otherwise a negative
|
|
* error code is returned.
|
|
*/
|
|
int security_fs_context_parse_param(struct fs_context *fc,
|
|
struct fs_parameter *param)
|
|
{
|
|
struct security_hook_list *hp;
|
|
int trc;
|
|
int rc = -ENOPARAM;
|
|
|
|
hlist_for_each_entry(hp, &security_hook_heads.fs_context_parse_param,
|
|
list) {
|
|
trc = hp->hook.fs_context_parse_param(fc, param);
|
|
if (trc == 0)
|
|
rc = 0;
|
|
else if (trc != -ENOPARAM)
|
|
return trc;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* security_sb_alloc() - Allocate a super_block LSM blob
|
|
* @sb: filesystem superblock
|
|
*
|
|
* Allocate and attach a security structure to the sb->s_security field. The
|
|
* s_security field is initialized to NULL when the structure is allocated.
|
|
* @sb contains the super_block structure to be modified.
|
|
*
|
|
* Return: Returns 0 if operation was successful.
|
|
*/
|
|
int security_sb_alloc(struct super_block *sb)
|
|
{
|
|
int rc = lsm_superblock_alloc(sb);
|
|
|
|
if (unlikely(rc))
|
|
return rc;
|
|
rc = call_int_hook(sb_alloc_security, 0, sb);
|
|
if (unlikely(rc))
|
|
security_sb_free(sb);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* security_sb_delete() - Release super_block LSM associated objects
|
|
* @sb: filesystem superblock
|
|
*
|
|
* Release objects tied to a superblock (e.g. inodes). @sb contains the
|
|
* super_block structure being released.
|
|
*/
|
|
void security_sb_delete(struct super_block *sb)
|
|
{
|
|
call_void_hook(sb_delete, sb);
|
|
}
|
|
|
|
/**
|
|
* security_sb_free() - Free a super_block LSM blob
|
|
* @sb: filesystem superblock
|
|
*
|
|
* Deallocate and clear the sb->s_security field. @sb contains the super_block
|
|
* structure to be modified.
|
|
*/
|
|
void security_sb_free(struct super_block *sb)
|
|
{
|
|
call_void_hook(sb_free_security, sb);
|
|
kfree(sb->s_security);
|
|
sb->s_security = NULL;
|
|
}
|
|
|
|
/**
|
|
* security_free_mnt_opts() - Free memory associated with mount options
|
|
* @mnt_opts: LSM processed mount options
|
|
*
|
|
* Free memory associated with @mnt_ops.
|
|
*/
|
|
void security_free_mnt_opts(void **mnt_opts)
|
|
{
|
|
if (!*mnt_opts)
|
|
return;
|
|
call_void_hook(sb_free_mnt_opts, *mnt_opts);
|
|
*mnt_opts = NULL;
|
|
}
|
|
EXPORT_SYMBOL(security_free_mnt_opts);
|
|
|
|
/**
|
|
* security_sb_eat_lsm_opts() - Consume LSM mount options
|
|
* @options: mount options
|
|
* @mnt_opts: LSM processed mount options
|
|
*
|
|
* Eat (scan @options) and save them in @mnt_opts.
|
|
*
|
|
* Return: Returns 0 on success, negative values on failure.
|
|
*/
|
|
int security_sb_eat_lsm_opts(char *options, void **mnt_opts)
|
|
{
|
|
return call_int_hook(sb_eat_lsm_opts, 0, options, mnt_opts);
|
|
}
|
|
EXPORT_SYMBOL(security_sb_eat_lsm_opts);
|
|
|
|
/**
|
|
* security_sb_mnt_opts_compat() - Check if new mount options are allowed
|
|
* @sb: filesystem superblock
|
|
* @mnt_opts: new mount options
|
|
*
|
|
* Determine if the new mount options in @mnt_opts are allowed given the
|
|
* existing mounted filesystem at @sb. @sb superblock being compared.
|
|
*
|
|
* Return: Returns 0 if options are compatible.
|
|
*/
|
|
int security_sb_mnt_opts_compat(struct super_block *sb,
|
|
void *mnt_opts)
|
|
{
|
|
return call_int_hook(sb_mnt_opts_compat, 0, sb, mnt_opts);
|
|
}
|
|
EXPORT_SYMBOL(security_sb_mnt_opts_compat);
|
|
|
|
/**
|
|
* security_sb_remount() - Verify no incompatible mount changes during remount
|
|
* @sb: filesystem superblock
|
|
* @mnt_opts: (re)mount options
|
|
*
|
|
* Extracts security system specific mount options and verifies no changes are
|
|
* being made to those options.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_sb_remount(struct super_block *sb,
|
|
void *mnt_opts)
|
|
{
|
|
return call_int_hook(sb_remount, 0, sb, mnt_opts);
|
|
}
|
|
EXPORT_SYMBOL(security_sb_remount);
|
|
|
|
/**
|
|
* security_sb_kern_mount() - Check if a kernel mount is allowed
|
|
* @sb: filesystem superblock
|
|
*
|
|
* Mount this @sb if allowed by permissions.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_sb_kern_mount(struct super_block *sb)
|
|
{
|
|
return call_int_hook(sb_kern_mount, 0, sb);
|
|
}
|
|
|
|
/**
|
|
* security_sb_show_options() - Output the mount options for a superblock
|
|
* @m: output file
|
|
* @sb: filesystem superblock
|
|
*
|
|
* Show (print on @m) mount options for this @sb.
|
|
*
|
|
* Return: Returns 0 on success, negative values on failure.
|
|
*/
|
|
int security_sb_show_options(struct seq_file *m, struct super_block *sb)
|
|
{
|
|
return call_int_hook(sb_show_options, 0, m, sb);
|
|
}
|
|
|
|
/**
|
|
* security_sb_statfs() - Check if accessing fs stats is allowed
|
|
* @dentry: superblock handle
|
|
*
|
|
* Check permission before obtaining filesystem statistics for the @mnt
|
|
* mountpoint. @dentry is a handle on the superblock for the filesystem.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_sb_statfs(struct dentry *dentry)
|
|
{
|
|
return call_int_hook(sb_statfs, 0, dentry);
|
|
}
|
|
|
|
/**
|
|
* security_sb_mount() - Check permission for mounting a filesystem
|
|
* @dev_name: filesystem backing device
|
|
* @path: mount point
|
|
* @type: filesystem type
|
|
* @flags: mount flags
|
|
* @data: filesystem specific data
|
|
*
|
|
* Check permission before an object specified by @dev_name is mounted on the
|
|
* mount point named by @nd. For an ordinary mount, @dev_name identifies a
|
|
* device if the file system type requires a device. For a remount
|
|
* (@flags & MS_REMOUNT), @dev_name is irrelevant. For a loopback/bind mount
|
|
* (@flags & MS_BIND), @dev_name identifies the pathname of the object being
|
|
* mounted.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_sb_mount(const char *dev_name, const struct path *path,
|
|
const char *type, unsigned long flags, void *data)
|
|
{
|
|
return call_int_hook(sb_mount, 0, dev_name, path, type, flags, data);
|
|
}
|
|
|
|
/**
|
|
* security_sb_umount() - Check permission for unmounting a filesystem
|
|
* @mnt: mounted filesystem
|
|
* @flags: unmount flags
|
|
*
|
|
* Check permission before the @mnt file system is unmounted.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_sb_umount(struct vfsmount *mnt, int flags)
|
|
{
|
|
return call_int_hook(sb_umount, 0, mnt, flags);
|
|
}
|
|
|
|
/**
|
|
* security_sb_pivotroot() - Check permissions for pivoting the rootfs
|
|
* @old_path: new location for current rootfs
|
|
* @new_path: location of the new rootfs
|
|
*
|
|
* Check permission before pivoting the root filesystem.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_sb_pivotroot(const struct path *old_path,
|
|
const struct path *new_path)
|
|
{
|
|
return call_int_hook(sb_pivotroot, 0, old_path, new_path);
|
|
}
|
|
|
|
/**
|
|
* security_sb_set_mnt_opts() - Set the mount options for a filesystem
|
|
* @sb: filesystem superblock
|
|
* @mnt_opts: binary mount options
|
|
* @kern_flags: kernel flags (in)
|
|
* @set_kern_flags: kernel flags (out)
|
|
*
|
|
* Set the security relevant mount options used for a superblock.
|
|
*
|
|
* Return: Returns 0 on success, error on failure.
|
|
*/
|
|
int security_sb_set_mnt_opts(struct super_block *sb,
|
|
void *mnt_opts,
|
|
unsigned long kern_flags,
|
|
unsigned long *set_kern_flags)
|
|
{
|
|
return call_int_hook(sb_set_mnt_opts,
|
|
mnt_opts ? -EOPNOTSUPP : 0, sb,
|
|
mnt_opts, kern_flags, set_kern_flags);
|
|
}
|
|
EXPORT_SYMBOL(security_sb_set_mnt_opts);
|
|
|
|
/**
|
|
* security_sb_clone_mnt_opts() - Duplicate superblock mount options
|
|
* @oldsb: source superblock
|
|
* @newsb: destination superblock
|
|
* @kern_flags: kernel flags (in)
|
|
* @set_kern_flags: kernel flags (out)
|
|
*
|
|
* Copy all security options from a given superblock to another.
|
|
*
|
|
* Return: Returns 0 on success, error on failure.
|
|
*/
|
|
int security_sb_clone_mnt_opts(const struct super_block *oldsb,
|
|
struct super_block *newsb,
|
|
unsigned long kern_flags,
|
|
unsigned long *set_kern_flags)
|
|
{
|
|
return call_int_hook(sb_clone_mnt_opts, 0, oldsb, newsb,
|
|
kern_flags, set_kern_flags);
|
|
}
|
|
EXPORT_SYMBOL(security_sb_clone_mnt_opts);
|
|
|
|
/**
|
|
* security_move_mount() - Check permissions for moving a mount
|
|
* @from_path: source mount point
|
|
* @to_path: destination mount point
|
|
*
|
|
* Check permission before a mount is moved.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_move_mount(const struct path *from_path,
|
|
const struct path *to_path)
|
|
{
|
|
return call_int_hook(move_mount, 0, from_path, to_path);
|
|
}
|
|
|
|
/**
|
|
* security_path_notify() - Check if setting a watch is allowed
|
|
* @path: file path
|
|
* @mask: event mask
|
|
* @obj_type: file path type
|
|
*
|
|
* Check permissions before setting a watch on events as defined by @mask, on
|
|
* an object at @path, whose type is defined by @obj_type.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_path_notify(const struct path *path, u64 mask,
|
|
unsigned int obj_type)
|
|
{
|
|
return call_int_hook(path_notify, 0, path, mask, obj_type);
|
|
}
|
|
|
|
/**
|
|
* security_inode_alloc() - Allocate an inode LSM blob
|
|
* @inode: the inode
|
|
*
|
|
* Allocate and attach a security structure to @inode->i_security. The
|
|
* i_security field is initialized to NULL when the inode structure is
|
|
* allocated.
|
|
*
|
|
* Return: Return 0 if operation was successful.
|
|
*/
|
|
int security_inode_alloc(struct inode *inode)
|
|
{
|
|
int rc = lsm_inode_alloc(inode);
|
|
|
|
if (unlikely(rc))
|
|
return rc;
|
|
rc = call_int_hook(inode_alloc_security, 0, inode);
|
|
if (unlikely(rc))
|
|
security_inode_free(inode);
|
|
return rc;
|
|
}
|
|
|
|
static void inode_free_by_rcu(struct rcu_head *head)
|
|
{
|
|
/*
|
|
* The rcu head is at the start of the inode blob
|
|
*/
|
|
kmem_cache_free(lsm_inode_cache, head);
|
|
}
|
|
|
|
/**
|
|
* security_inode_free() - Free an inode's LSM blob
|
|
* @inode: the inode
|
|
*
|
|
* Deallocate the inode security structure and set @inode->i_security to NULL.
|
|
*/
|
|
void security_inode_free(struct inode *inode)
|
|
{
|
|
integrity_inode_free(inode);
|
|
call_void_hook(inode_free_security, inode);
|
|
/*
|
|
* The inode may still be referenced in a path walk and
|
|
* a call to security_inode_permission() can be made
|
|
* after inode_free_security() is called. Ideally, the VFS
|
|
* wouldn't do this, but fixing that is a much harder
|
|
* job. For now, simply free the i_security via RCU, and
|
|
* leave the current inode->i_security pointer intact.
|
|
* The inode will be freed after the RCU grace period too.
|
|
*/
|
|
if (inode->i_security)
|
|
call_rcu((struct rcu_head *)inode->i_security,
|
|
inode_free_by_rcu);
|
|
}
|
|
|
|
/**
|
|
* security_dentry_init_security() - Perform dentry initialization
|
|
* @dentry: the dentry to initialize
|
|
* @mode: mode used to determine resource type
|
|
* @name: name of the last path component
|
|
* @xattr_name: name of the security/LSM xattr
|
|
* @ctx: pointer to the resulting LSM context
|
|
* @ctxlen: length of @ctx
|
|
*
|
|
* Compute a context for a dentry as the inode is not yet available since NFSv4
|
|
* has no label backed by an EA anyway. It is important to note that
|
|
* @xattr_name does not need to be free'd by the caller, it is a static string.
|
|
*
|
|
* Return: Returns 0 on success, negative values on failure.
|
|
*/
|
|
int security_dentry_init_security(struct dentry *dentry, int mode,
|
|
const struct qstr *name,
|
|
const char **xattr_name, void **ctx,
|
|
u32 *ctxlen)
|
|
{
|
|
struct security_hook_list *hp;
|
|
int rc;
|
|
|
|
/*
|
|
* Only one module will provide a security context.
|
|
*/
|
|
hlist_for_each_entry(hp, &security_hook_heads.dentry_init_security,
|
|
list) {
|
|
rc = hp->hook.dentry_init_security(dentry, mode, name,
|
|
xattr_name, ctx, ctxlen);
|
|
if (rc != LSM_RET_DEFAULT(dentry_init_security))
|
|
return rc;
|
|
}
|
|
return LSM_RET_DEFAULT(dentry_init_security);
|
|
}
|
|
EXPORT_SYMBOL(security_dentry_init_security);
|
|
|
|
/**
|
|
* security_dentry_create_files_as() - Perform dentry initialization
|
|
* @dentry: the dentry to initialize
|
|
* @mode: mode used to determine resource type
|
|
* @name: name of the last path component
|
|
* @old: creds to use for LSM context calculations
|
|
* @new: creds to modify
|
|
*
|
|
* Compute a context for a dentry as the inode is not yet available and set
|
|
* that context in passed in creds so that new files are created using that
|
|
* context. Context is calculated using the passed in creds and not the creds
|
|
* of the caller.
|
|
*
|
|
* Return: Returns 0 on success, error on failure.
|
|
*/
|
|
int security_dentry_create_files_as(struct dentry *dentry, int mode,
|
|
struct qstr *name,
|
|
const struct cred *old, struct cred *new)
|
|
{
|
|
return call_int_hook(dentry_create_files_as, 0, dentry, mode,
|
|
name, old, new);
|
|
}
|
|
EXPORT_SYMBOL(security_dentry_create_files_as);
|
|
|
|
/**
|
|
* security_inode_init_security() - Initialize an inode's LSM context
|
|
* @inode: the inode
|
|
* @dir: parent directory
|
|
* @qstr: last component of the pathname
|
|
* @initxattrs: callback function to write xattrs
|
|
* @fs_data: filesystem specific data
|
|
*
|
|
* Obtain the security attribute name suffix and value to set on a newly
|
|
* created inode and set up the incore security field for the new inode. This
|
|
* hook is called by the fs code as part of the inode creation transaction and
|
|
* provides for atomic labeling of the inode, unlike the post_create/mkdir/...
|
|
* hooks called by the VFS. The hook function is expected to allocate the name
|
|
* and value via kmalloc, with the caller being responsible for calling kfree
|
|
* after using them. If the security module does not use security attributes
|
|
* or does not wish to put a security attribute on this particular inode, then
|
|
* it should return -EOPNOTSUPP to skip this processing.
|
|
*
|
|
* Return: Returns 0 on success, -EOPNOTSUPP if no security attribute is
|
|
* needed, or -ENOMEM on memory allocation failure.
|
|
*/
|
|
int security_inode_init_security(struct inode *inode, struct inode *dir,
|
|
const struct qstr *qstr,
|
|
const initxattrs initxattrs, void *fs_data)
|
|
{
|
|
struct xattr new_xattrs[MAX_LSM_EVM_XATTR + 1];
|
|
struct xattr *lsm_xattr, *evm_xattr, *xattr;
|
|
int ret;
|
|
|
|
if (unlikely(IS_PRIVATE(inode)))
|
|
return 0;
|
|
|
|
if (!initxattrs)
|
|
return call_int_hook(inode_init_security, -EOPNOTSUPP, inode,
|
|
dir, qstr, NULL, NULL, NULL);
|
|
memset(new_xattrs, 0, sizeof(new_xattrs));
|
|
lsm_xattr = new_xattrs;
|
|
ret = call_int_hook(inode_init_security, -EOPNOTSUPP, inode, dir, qstr,
|
|
&lsm_xattr->name,
|
|
&lsm_xattr->value,
|
|
&lsm_xattr->value_len);
|
|
if (ret)
|
|
goto out;
|
|
|
|
evm_xattr = lsm_xattr + 1;
|
|
ret = evm_inode_init_security(inode, lsm_xattr, evm_xattr);
|
|
if (ret)
|
|
goto out;
|
|
ret = initxattrs(inode, new_xattrs, fs_data);
|
|
out:
|
|
for (xattr = new_xattrs; xattr->value != NULL; xattr++)
|
|
kfree(xattr->value);
|
|
return (ret == -EOPNOTSUPP) ? 0 : ret;
|
|
}
|
|
EXPORT_SYMBOL(security_inode_init_security);
|
|
|
|
/**
|
|
* security_inode_init_security_anon() - Initialize an anonymous inode
|
|
* @inode: the inode
|
|
* @name: the anonymous inode class
|
|
* @context_inode: an optional related inode
|
|
*
|
|
* Set up the incore security field for the new anonymous inode and return
|
|
* whether the inode creation is permitted by the security module or not.
|
|
*
|
|
* Return: Returns 0 on success, -EACCES if the security module denies the
|
|
* creation of this inode, or another -errno upon other errors.
|
|
*/
|
|
int security_inode_init_security_anon(struct inode *inode,
|
|
const struct qstr *name,
|
|
const struct inode *context_inode)
|
|
{
|
|
return call_int_hook(inode_init_security_anon, 0, inode, name,
|
|
context_inode);
|
|
}
|
|
|
|
#ifdef CONFIG_SECURITY_PATH
|
|
/**
|
|
* security_path_mknod() - Check if creating a special file is allowed
|
|
* @dir: parent directory
|
|
* @dentry: new file
|
|
* @mode: new file mode
|
|
* @dev: device number
|
|
*
|
|
* Check permissions when creating a file. Note that this hook is called even
|
|
* if mknod operation is being done for a regular file.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_path_mknod(const struct path *dir, struct dentry *dentry,
|
|
umode_t mode, unsigned int dev)
|
|
{
|
|
if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
|
|
return 0;
|
|
return call_int_hook(path_mknod, 0, dir, dentry, mode, dev);
|
|
}
|
|
EXPORT_SYMBOL(security_path_mknod);
|
|
|
|
/**
|
|
* security_path_mkdir() - Check if creating a new directory is allowed
|
|
* @dir: parent directory
|
|
* @dentry: new directory
|
|
* @mode: new directory mode
|
|
*
|
|
* Check permissions to create a new directory in the existing directory.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_path_mkdir(const struct path *dir, struct dentry *dentry,
|
|
umode_t mode)
|
|
{
|
|
if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
|
|
return 0;
|
|
return call_int_hook(path_mkdir, 0, dir, dentry, mode);
|
|
}
|
|
EXPORT_SYMBOL(security_path_mkdir);
|
|
|
|
/**
|
|
* security_path_rmdir() - Check if removing a directory is allowed
|
|
* @dir: parent directory
|
|
* @dentry: directory to remove
|
|
*
|
|
* Check the permission to remove a directory.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_path_rmdir(const struct path *dir, struct dentry *dentry)
|
|
{
|
|
if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
|
|
return 0;
|
|
return call_int_hook(path_rmdir, 0, dir, dentry);
|
|
}
|
|
|
|
/**
|
|
* security_path_unlink() - Check if removing a hard link is allowed
|
|
* @dir: parent directory
|
|
* @dentry: file
|
|
*
|
|
* Check the permission to remove a hard link to a file.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_path_unlink(const struct path *dir, struct dentry *dentry)
|
|
{
|
|
if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
|
|
return 0;
|
|
return call_int_hook(path_unlink, 0, dir, dentry);
|
|
}
|
|
EXPORT_SYMBOL(security_path_unlink);
|
|
|
|
/**
|
|
* security_path_symlink() - Check if creating a symbolic link is allowed
|
|
* @dir: parent directory
|
|
* @dentry: symbolic link
|
|
* @old_name: file pathname
|
|
*
|
|
* Check the permission to create a symbolic link to a file.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_path_symlink(const struct path *dir, struct dentry *dentry,
|
|
const char *old_name)
|
|
{
|
|
if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
|
|
return 0;
|
|
return call_int_hook(path_symlink, 0, dir, dentry, old_name);
|
|
}
|
|
|
|
/**
|
|
* security_path_link - Check if creating a hard link is allowed
|
|
* @old_dentry: existing file
|
|
* @new_dir: new parent directory
|
|
* @new_dentry: new link
|
|
*
|
|
* Check permission before creating a new hard link to a file.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_path_link(struct dentry *old_dentry, const struct path *new_dir,
|
|
struct dentry *new_dentry)
|
|
{
|
|
if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry))))
|
|
return 0;
|
|
return call_int_hook(path_link, 0, old_dentry, new_dir, new_dentry);
|
|
}
|
|
|
|
/**
|
|
* security_path_rename() - Check if renaming a file is allowed
|
|
* @old_dir: parent directory of the old file
|
|
* @old_dentry: the old file
|
|
* @new_dir: parent directory of the new file
|
|
* @new_dentry: the new file
|
|
* @flags: flags
|
|
*
|
|
* Check for permission to rename a file or directory.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_path_rename(const struct path *old_dir, struct dentry *old_dentry,
|
|
const struct path *new_dir, struct dentry *new_dentry,
|
|
unsigned int flags)
|
|
{
|
|
if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)) ||
|
|
(d_is_positive(new_dentry) &&
|
|
IS_PRIVATE(d_backing_inode(new_dentry)))))
|
|
return 0;
|
|
|
|
return call_int_hook(path_rename, 0, old_dir, old_dentry, new_dir,
|
|
new_dentry, flags);
|
|
}
|
|
EXPORT_SYMBOL(security_path_rename);
|
|
|
|
/**
|
|
* security_path_truncate() - Check if truncating a file is allowed
|
|
* @path: file
|
|
*
|
|
* Check permission before truncating the file indicated by path. Note that
|
|
* truncation permissions may also be checked based on already opened files,
|
|
* using the security_file_truncate() hook.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_path_truncate(const struct path *path)
|
|
{
|
|
if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
|
|
return 0;
|
|
return call_int_hook(path_truncate, 0, path);
|
|
}
|
|
|
|
/**
|
|
* security_path_chmod() - Check if changing the file's mode is allowed
|
|
* @path: file
|
|
* @mode: new mode
|
|
*
|
|
* Check for permission to change a mode of the file @path. The new mode is
|
|
* specified in @mode which is a bitmask of constants from
|
|
* <include/uapi/linux/stat.h>.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_path_chmod(const struct path *path, umode_t mode)
|
|
{
|
|
if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
|
|
return 0;
|
|
return call_int_hook(path_chmod, 0, path, mode);
|
|
}
|
|
|
|
/**
|
|
* security_path_chown() - Check if changing the file's owner/group is allowed
|
|
* @path: file
|
|
* @uid: file owner
|
|
* @gid: file group
|
|
*
|
|
* Check for permission to change owner/group of a file or directory.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_path_chown(const struct path *path, kuid_t uid, kgid_t gid)
|
|
{
|
|
if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
|
|
return 0;
|
|
return call_int_hook(path_chown, 0, path, uid, gid);
|
|
}
|
|
|
|
/**
|
|
* security_path_chroot() - Check if changing the root directory is allowed
|
|
* @path: directory
|
|
*
|
|
* Check for permission to change root directory.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_path_chroot(const struct path *path)
|
|
{
|
|
return call_int_hook(path_chroot, 0, path);
|
|
}
|
|
#endif /* CONFIG_SECURITY_PATH */
|
|
|
|
/**
|
|
* security_inode_create() - Check if creating a file is allowed
|
|
* @dir: the parent directory
|
|
* @dentry: the file being created
|
|
* @mode: requested file mode
|
|
*
|
|
* Check permission to create a regular file.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_inode_create(struct inode *dir, struct dentry *dentry,
|
|
umode_t mode)
|
|
{
|
|
if (unlikely(IS_PRIVATE(dir)))
|
|
return 0;
|
|
return call_int_hook(inode_create, 0, dir, dentry, mode);
|
|
}
|
|
EXPORT_SYMBOL_GPL(security_inode_create);
|
|
|
|
/**
|
|
* security_inode_link() - Check if creating a hard link is allowed
|
|
* @old_dentry: existing file
|
|
* @dir: new parent directory
|
|
* @new_dentry: new link
|
|
*
|
|
* Check permission before creating a new hard link to a file.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_inode_link(struct dentry *old_dentry, struct inode *dir,
|
|
struct dentry *new_dentry)
|
|
{
|
|
if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry))))
|
|
return 0;
|
|
return call_int_hook(inode_link, 0, old_dentry, dir, new_dentry);
|
|
}
|
|
|
|
/**
|
|
* security_inode_unlink() - Check if removing a hard link is allowed
|
|
* @dir: parent directory
|
|
* @dentry: file
|
|
*
|
|
* Check the permission to remove a hard link to a file.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_inode_unlink(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
|
|
return 0;
|
|
return call_int_hook(inode_unlink, 0, dir, dentry);
|
|
}
|
|
|
|
/**
|
|
* security_inode_symlink() - Check if creating a symbolic link is allowed
|
|
* @dir: parent directory
|
|
* @dentry: symbolic link
|
|
* @old_name: existing filename
|
|
*
|
|
* Check the permission to create a symbolic link to a file.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_inode_symlink(struct inode *dir, struct dentry *dentry,
|
|
const char *old_name)
|
|
{
|
|
if (unlikely(IS_PRIVATE(dir)))
|
|
return 0;
|
|
return call_int_hook(inode_symlink, 0, dir, dentry, old_name);
|
|
}
|
|
|
|
/**
|
|
* security_inode_mkdir() - Check if creation a new director is allowed
|
|
* @dir: parent directory
|
|
* @dentry: new directory
|
|
* @mode: new directory mode
|
|
*
|
|
* Check permissions to create a new directory in the existing directory
|
|
* associated with inode structure @dir.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_inode_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
|
|
{
|
|
if (unlikely(IS_PRIVATE(dir)))
|
|
return 0;
|
|
return call_int_hook(inode_mkdir, 0, dir, dentry, mode);
|
|
}
|
|
EXPORT_SYMBOL_GPL(security_inode_mkdir);
|
|
|
|
/**
|
|
* security_inode_rmdir() - Check if removing a directory is allowed
|
|
* @dir: parent directory
|
|
* @dentry: directory to be removed
|
|
*
|
|
* Check the permission to remove a directory.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_inode_rmdir(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
|
|
return 0;
|
|
return call_int_hook(inode_rmdir, 0, dir, dentry);
|
|
}
|
|
|
|
/**
|
|
* security_inode_mknod() - Check if creating a special file is allowed
|
|
* @dir: parent directory
|
|
* @dentry: new file
|
|
* @mode: new file mode
|
|
* @dev: device number
|
|
*
|
|
* Check permissions when creating a special file (or a socket or a fifo file
|
|
* created via the mknod system call). Note that if mknod operation is being
|
|
* done for a regular file, then the create hook will be called and not this
|
|
* hook.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_inode_mknod(struct inode *dir, struct dentry *dentry,
|
|
umode_t mode, dev_t dev)
|
|
{
|
|
if (unlikely(IS_PRIVATE(dir)))
|
|
return 0;
|
|
return call_int_hook(inode_mknod, 0, dir, dentry, mode, dev);
|
|
}
|
|
|
|
/**
|
|
* security_inode_rename() - Check if renaming a file is allowed
|
|
* @old_dir: parent directory of the old file
|
|
* @old_dentry: the old file
|
|
* @new_dir: parent directory of the new file
|
|
* @new_dentry: the new file
|
|
* @flags: flags
|
|
*
|
|
* Check for permission to rename a file or directory.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_inode_rename(struct inode *old_dir, struct dentry *old_dentry,
|
|
struct inode *new_dir, struct dentry *new_dentry,
|
|
unsigned int flags)
|
|
{
|
|
if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)) ||
|
|
(d_is_positive(new_dentry) &&
|
|
IS_PRIVATE(d_backing_inode(new_dentry)))))
|
|
return 0;
|
|
|
|
if (flags & RENAME_EXCHANGE) {
|
|
int err = call_int_hook(inode_rename, 0, new_dir, new_dentry,
|
|
old_dir, old_dentry);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
return call_int_hook(inode_rename, 0, old_dir, old_dentry,
|
|
new_dir, new_dentry);
|
|
}
|
|
|
|
/**
|
|
* security_inode_readlink() - Check if reading a symbolic link is allowed
|
|
* @dentry: link
|
|
*
|
|
* Check the permission to read the symbolic link.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_inode_readlink(struct dentry *dentry)
|
|
{
|
|
if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
|
|
return 0;
|
|
return call_int_hook(inode_readlink, 0, dentry);
|
|
}
|
|
|
|
/**
|
|
* security_inode_follow_link() - Check if following a symbolic link is allowed
|
|
* @dentry: link dentry
|
|
* @inode: link inode
|
|
* @rcu: true if in RCU-walk mode
|
|
*
|
|
* Check permission to follow a symbolic link when looking up a pathname. If
|
|
* @rcu is true, @inode is not stable.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_inode_follow_link(struct dentry *dentry, struct inode *inode,
|
|
bool rcu)
|
|
{
|
|
if (unlikely(IS_PRIVATE(inode)))
|
|
return 0;
|
|
return call_int_hook(inode_follow_link, 0, dentry, inode, rcu);
|
|
}
|
|
|
|
/**
|
|
* security_inode_permission() - Check if accessing an inode is allowed
|
|
* @inode: inode
|
|
* @mask: access mask
|
|
*
|
|
* Check permission before accessing an inode. This hook is called by the
|
|
* existing Linux permission function, so a security module can use it to
|
|
* provide additional checking for existing Linux permission checks. Notice
|
|
* that this hook is called when a file is opened (as well as many other
|
|
* operations), whereas the file_security_ops permission hook is called when
|
|
* the actual read/write operations are performed.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_inode_permission(struct inode *inode, int mask)
|
|
{
|
|
if (unlikely(IS_PRIVATE(inode)))
|
|
return 0;
|
|
return call_int_hook(inode_permission, 0, inode, mask);
|
|
}
|
|
|
|
/**
|
|
* security_inode_setattr() - Check if setting file attributes is allowed
|
|
* @idmap: idmap of the mount
|
|
* @dentry: file
|
|
* @attr: new attributes
|
|
*
|
|
* Check permission before setting file attributes. Note that the kernel call
|
|
* to notify_change is performed from several locations, whenever file
|
|
* attributes change (such as when a file is truncated, chown/chmod operations,
|
|
* transferring disk quotas, etc).
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_inode_setattr(struct mnt_idmap *idmap,
|
|
struct dentry *dentry, struct iattr *attr)
|
|
{
|
|
int ret;
|
|
|
|
if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
|
|
return 0;
|
|
ret = call_int_hook(inode_setattr, 0, dentry, attr);
|
|
if (ret)
|
|
return ret;
|
|
return evm_inode_setattr(idmap, dentry, attr);
|
|
}
|
|
EXPORT_SYMBOL_GPL(security_inode_setattr);
|
|
|
|
/**
|
|
* security_inode_getattr() - Check if getting file attributes is allowed
|
|
* @path: file
|
|
*
|
|
* Check permission before obtaining file attributes.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_inode_getattr(const struct path *path)
|
|
{
|
|
if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
|
|
return 0;
|
|
return call_int_hook(inode_getattr, 0, path);
|
|
}
|
|
|
|
/**
|
|
* security_inode_setxattr() - Check if setting file xattrs is allowed
|
|
* @idmap: idmap of the mount
|
|
* @dentry: file
|
|
* @name: xattr name
|
|
* @value: xattr value
|
|
* @size: size of xattr value
|
|
* @flags: flags
|
|
*
|
|
* Check permission before setting the extended attributes.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_inode_setxattr(struct mnt_idmap *idmap,
|
|
struct dentry *dentry, const char *name,
|
|
const void *value, size_t size, int flags)
|
|
{
|
|
int ret;
|
|
|
|
if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
|
|
return 0;
|
|
/*
|
|
* SELinux and Smack integrate the cap call,
|
|
* so assume that all LSMs supplying this call do so.
|
|
*/
|
|
ret = call_int_hook(inode_setxattr, 1, idmap, dentry, name, value,
|
|
size, flags);
|
|
|
|
if (ret == 1)
|
|
ret = cap_inode_setxattr(dentry, name, value, size, flags);
|
|
if (ret)
|
|
return ret;
|
|
ret = ima_inode_setxattr(dentry, name, value, size);
|
|
if (ret)
|
|
return ret;
|
|
return evm_inode_setxattr(idmap, dentry, name, value, size);
|
|
}
|
|
|
|
/**
|
|
* security_inode_set_acl() - Check if setting posix acls is allowed
|
|
* @idmap: idmap of the mount
|
|
* @dentry: file
|
|
* @acl_name: acl name
|
|
* @kacl: acl struct
|
|
*
|
|
* Check permission before setting posix acls, the posix acls in @kacl are
|
|
* identified by @acl_name.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_inode_set_acl(struct mnt_idmap *idmap,
|
|
struct dentry *dentry, const char *acl_name,
|
|
struct posix_acl *kacl)
|
|
{
|
|
int ret;
|
|
|
|
if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
|
|
return 0;
|
|
ret = call_int_hook(inode_set_acl, 0, idmap, dentry, acl_name,
|
|
kacl);
|
|
if (ret)
|
|
return ret;
|
|
ret = ima_inode_set_acl(idmap, dentry, acl_name, kacl);
|
|
if (ret)
|
|
return ret;
|
|
return evm_inode_set_acl(idmap, dentry, acl_name, kacl);
|
|
}
|
|
|
|
/**
|
|
* security_inode_get_acl() - Check if reading posix acls is allowed
|
|
* @idmap: idmap of the mount
|
|
* @dentry: file
|
|
* @acl_name: acl name
|
|
*
|
|
* Check permission before getting osix acls, the posix acls are identified by
|
|
* @acl_name.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_inode_get_acl(struct mnt_idmap *idmap,
|
|
struct dentry *dentry, const char *acl_name)
|
|
{
|
|
if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
|
|
return 0;
|
|
return call_int_hook(inode_get_acl, 0, idmap, dentry, acl_name);
|
|
}
|
|
|
|
/**
|
|
* security_inode_remove_acl() - Check if removing a posix acl is allowed
|
|
* @idmap: idmap of the mount
|
|
* @dentry: file
|
|
* @acl_name: acl name
|
|
*
|
|
* Check permission before removing posix acls, the posix acls are identified
|
|
* by @acl_name.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_inode_remove_acl(struct mnt_idmap *idmap,
|
|
struct dentry *dentry, const char *acl_name)
|
|
{
|
|
int ret;
|
|
|
|
if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
|
|
return 0;
|
|
ret = call_int_hook(inode_remove_acl, 0, idmap, dentry, acl_name);
|
|
if (ret)
|
|
return ret;
|
|
ret = ima_inode_remove_acl(idmap, dentry, acl_name);
|
|
if (ret)
|
|
return ret;
|
|
return evm_inode_remove_acl(idmap, dentry, acl_name);
|
|
}
|
|
|
|
/**
|
|
* security_inode_post_setxattr() - Update the inode after a setxattr operation
|
|
* @dentry: file
|
|
* @name: xattr name
|
|
* @value: xattr value
|
|
* @size: xattr value size
|
|
* @flags: flags
|
|
*
|
|
* Update inode security field after successful setxattr operation.
|
|
*/
|
|
void security_inode_post_setxattr(struct dentry *dentry, const char *name,
|
|
const void *value, size_t size, int flags)
|
|
{
|
|
if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
|
|
return;
|
|
call_void_hook(inode_post_setxattr, dentry, name, value, size, flags);
|
|
evm_inode_post_setxattr(dentry, name, value, size);
|
|
}
|
|
|
|
/**
|
|
* security_inode_getxattr() - Check if xattr access is allowed
|
|
* @dentry: file
|
|
* @name: xattr name
|
|
*
|
|
* Check permission before obtaining the extended attributes identified by
|
|
* @name for @dentry.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_inode_getxattr(struct dentry *dentry, const char *name)
|
|
{
|
|
if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
|
|
return 0;
|
|
return call_int_hook(inode_getxattr, 0, dentry, name);
|
|
}
|
|
|
|
/**
|
|
* security_inode_listxattr() - Check if listing xattrs is allowed
|
|
* @dentry: file
|
|
*
|
|
* Check permission before obtaining the list of extended attribute names for
|
|
* @dentry.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_inode_listxattr(struct dentry *dentry)
|
|
{
|
|
if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
|
|
return 0;
|
|
return call_int_hook(inode_listxattr, 0, dentry);
|
|
}
|
|
|
|
/**
|
|
* security_inode_removexattr() - Check if removing an xattr is allowed
|
|
* @idmap: idmap of the mount
|
|
* @dentry: file
|
|
* @name: xattr name
|
|
*
|
|
* Check permission before removing the extended attribute identified by @name
|
|
* for @dentry.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_inode_removexattr(struct mnt_idmap *idmap,
|
|
struct dentry *dentry, const char *name)
|
|
{
|
|
int ret;
|
|
|
|
if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
|
|
return 0;
|
|
/*
|
|
* SELinux and Smack integrate the cap call,
|
|
* so assume that all LSMs supplying this call do so.
|
|
*/
|
|
ret = call_int_hook(inode_removexattr, 1, idmap, dentry, name);
|
|
if (ret == 1)
|
|
ret = cap_inode_removexattr(idmap, dentry, name);
|
|
if (ret)
|
|
return ret;
|
|
ret = ima_inode_removexattr(dentry, name);
|
|
if (ret)
|
|
return ret;
|
|
return evm_inode_removexattr(idmap, dentry, name);
|
|
}
|
|
|
|
/**
|
|
* security_inode_need_killpriv() - Check if security_inode_killpriv() required
|
|
* @dentry: associated dentry
|
|
*
|
|
* Called when an inode has been changed to determine if
|
|
* security_inode_killpriv() should be called.
|
|
*
|
|
* Return: Return <0 on error to abort the inode change operation, return 0 if
|
|
* security_inode_killpriv() does not need to be called, return >0 if
|
|
* security_inode_killpriv() does need to be called.
|
|
*/
|
|
int security_inode_need_killpriv(struct dentry *dentry)
|
|
{
|
|
return call_int_hook(inode_need_killpriv, 0, dentry);
|
|
}
|
|
|
|
/**
|
|
* security_inode_killpriv() - The setuid bit is removed, update LSM state
|
|
* @idmap: idmap of the mount
|
|
* @dentry: associated dentry
|
|
*
|
|
* The @dentry's setuid bit is being removed. Remove similar security labels.
|
|
* Called with the dentry->d_inode->i_mutex held.
|
|
*
|
|
* Return: Return 0 on success. If error is returned, then the operation
|
|
* causing setuid bit removal is failed.
|
|
*/
|
|
int security_inode_killpriv(struct mnt_idmap *idmap,
|
|
struct dentry *dentry)
|
|
{
|
|
return call_int_hook(inode_killpriv, 0, idmap, dentry);
|
|
}
|
|
|
|
/**
|
|
* security_inode_getsecurity() - Get the xattr security label of an inode
|
|
* @idmap: idmap of the mount
|
|
* @inode: inode
|
|
* @name: xattr name
|
|
* @buffer: security label buffer
|
|
* @alloc: allocation flag
|
|
*
|
|
* Retrieve a copy of the extended attribute representation of the security
|
|
* label associated with @name for @inode via @buffer. Note that @name is the
|
|
* remainder of the attribute name after the security prefix has been removed.
|
|
* @alloc is used to specify if the call should return a value via the buffer
|
|
* or just the value length.
|
|
*
|
|
* Return: Returns size of buffer on success.
|
|
*/
|
|
int security_inode_getsecurity(struct mnt_idmap *idmap,
|
|
struct inode *inode, const char *name,
|
|
void **buffer, bool alloc)
|
|
{
|
|
struct security_hook_list *hp;
|
|
int rc;
|
|
|
|
if (unlikely(IS_PRIVATE(inode)))
|
|
return LSM_RET_DEFAULT(inode_getsecurity);
|
|
/*
|
|
* Only one module will provide an attribute with a given name.
|
|
*/
|
|
hlist_for_each_entry(hp, &security_hook_heads.inode_getsecurity, list) {
|
|
rc = hp->hook.inode_getsecurity(idmap, inode, name, buffer,
|
|
alloc);
|
|
if (rc != LSM_RET_DEFAULT(inode_getsecurity))
|
|
return rc;
|
|
}
|
|
return LSM_RET_DEFAULT(inode_getsecurity);
|
|
}
|
|
|
|
/**
|
|
* security_inode_setsecurity() - Set the xattr security label of an inode
|
|
* @inode: inode
|
|
* @name: xattr name
|
|
* @value: security label
|
|
* @size: length of security label
|
|
* @flags: flags
|
|
*
|
|
* Set the security label associated with @name for @inode from the extended
|
|
* attribute value @value. @size indicates the size of the @value in bytes.
|
|
* @flags may be XATTR_CREATE, XATTR_REPLACE, or 0. Note that @name is the
|
|
* remainder of the attribute name after the security. prefix has been removed.
|
|
*
|
|
* Return: Returns 0 on success.
|
|
*/
|
|
int security_inode_setsecurity(struct inode *inode, const char *name,
|
|
const void *value, size_t size, int flags)
|
|
{
|
|
struct security_hook_list *hp;
|
|
int rc;
|
|
|
|
if (unlikely(IS_PRIVATE(inode)))
|
|
return LSM_RET_DEFAULT(inode_setsecurity);
|
|
/*
|
|
* Only one module will provide an attribute with a given name.
|
|
*/
|
|
hlist_for_each_entry(hp, &security_hook_heads.inode_setsecurity, list) {
|
|
rc = hp->hook.inode_setsecurity(inode, name, value, size,
|
|
flags);
|
|
if (rc != LSM_RET_DEFAULT(inode_setsecurity))
|
|
return rc;
|
|
}
|
|
return LSM_RET_DEFAULT(inode_setsecurity);
|
|
}
|
|
|
|
/**
|
|
* security_inode_listsecurity() - List the xattr security label names
|
|
* @inode: inode
|
|
* @buffer: buffer
|
|
* @buffer_size: size of buffer
|
|
*
|
|
* Copy the extended attribute names for the security labels associated with
|
|
* @inode into @buffer. The maximum size of @buffer is specified by
|
|
* @buffer_size. @buffer may be NULL to request the size of the buffer
|
|
* required.
|
|
*
|
|
* Return: Returns number of bytes used/required on success.
|
|
*/
|
|
int security_inode_listsecurity(struct inode *inode,
|
|
char *buffer, size_t buffer_size)
|
|
{
|
|
if (unlikely(IS_PRIVATE(inode)))
|
|
return 0;
|
|
return call_int_hook(inode_listsecurity, 0, inode, buffer, buffer_size);
|
|
}
|
|
EXPORT_SYMBOL(security_inode_listsecurity);
|
|
|
|
/**
|
|
* security_inode_getsecid() - Get an inode's secid
|
|
* @inode: inode
|
|
* @secid: secid to return
|
|
*
|
|
* Get the secid associated with the node. In case of failure, @secid will be
|
|
* set to zero.
|
|
*/
|
|
void security_inode_getsecid(struct inode *inode, u32 *secid)
|
|
{
|
|
call_void_hook(inode_getsecid, inode, secid);
|
|
}
|
|
|
|
/**
|
|
* security_inode_copy_up() - Create new creds for an overlayfs copy-up op
|
|
* @src: union dentry of copy-up file
|
|
* @new: newly created creds
|
|
*
|
|
* A file is about to be copied up from lower layer to upper layer of overlay
|
|
* filesystem. Security module can prepare a set of new creds and modify as
|
|
* need be and return new creds. Caller will switch to new creds temporarily to
|
|
* create new file and release newly allocated creds.
|
|
*
|
|
* Return: Returns 0 on success or a negative error code on error.
|
|
*/
|
|
int security_inode_copy_up(struct dentry *src, struct cred **new)
|
|
{
|
|
return call_int_hook(inode_copy_up, 0, src, new);
|
|
}
|
|
EXPORT_SYMBOL(security_inode_copy_up);
|
|
|
|
/**
|
|
* security_inode_copy_up_xattr() - Filter xattrs in an overlayfs copy-up op
|
|
* @name: xattr name
|
|
*
|
|
* Filter the xattrs being copied up when a unioned file is copied up from a
|
|
* lower layer to the union/overlay layer. The caller is responsible for
|
|
* reading and writing the xattrs, this hook is merely a filter.
|
|
*
|
|
* Return: Returns 0 to accept the xattr, 1 to discard the xattr, -EOPNOTSUPP
|
|
* if the security module does not know about attribute, or a negative
|
|
* error code to abort the copy up.
|
|
*/
|
|
int security_inode_copy_up_xattr(const char *name)
|
|
{
|
|
struct security_hook_list *hp;
|
|
int rc;
|
|
|
|
/*
|
|
* The implementation can return 0 (accept the xattr), 1 (discard the
|
|
* xattr), -EOPNOTSUPP if it does not know anything about the xattr or
|
|
* any other error code in case of an error.
|
|
*/
|
|
hlist_for_each_entry(hp,
|
|
&security_hook_heads.inode_copy_up_xattr, list) {
|
|
rc = hp->hook.inode_copy_up_xattr(name);
|
|
if (rc != LSM_RET_DEFAULT(inode_copy_up_xattr))
|
|
return rc;
|
|
}
|
|
|
|
return LSM_RET_DEFAULT(inode_copy_up_xattr);
|
|
}
|
|
EXPORT_SYMBOL(security_inode_copy_up_xattr);
|
|
|
|
/**
|
|
* security_kernfs_init_security() - Init LSM context for a kernfs node
|
|
* @kn_dir: parent kernfs node
|
|
* @kn: the kernfs node to initialize
|
|
*
|
|
* Initialize the security context of a newly created kernfs node based on its
|
|
* own and its parent's attributes.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_kernfs_init_security(struct kernfs_node *kn_dir,
|
|
struct kernfs_node *kn)
|
|
{
|
|
return call_int_hook(kernfs_init_security, 0, kn_dir, kn);
|
|
}
|
|
|
|
/**
|
|
* security_file_permission() - Check file permissions
|
|
* @file: file
|
|
* @mask: requested permissions
|
|
*
|
|
* Check file permissions before accessing an open file. This hook is called
|
|
* by various operations that read or write files. A security module can use
|
|
* this hook to perform additional checking on these operations, e.g. to
|
|
* revalidate permissions on use to support privilege bracketing or policy
|
|
* changes. Notice that this hook is used when the actual read/write
|
|
* operations are performed, whereas the inode_security_ops hook is called when
|
|
* a file is opened (as well as many other operations). Although this hook can
|
|
* be used to revalidate permissions for various system call operations that
|
|
* read or write files, it does not address the revalidation of permissions for
|
|
* memory-mapped files. Security modules must handle this separately if they
|
|
* need such revalidation.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_file_permission(struct file *file, int mask)
|
|
{
|
|
int ret;
|
|
|
|
ret = call_int_hook(file_permission, 0, file, mask);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return fsnotify_perm(file, mask);
|
|
}
|
|
|
|
/**
|
|
* security_file_alloc() - Allocate and init a file's LSM blob
|
|
* @file: the file
|
|
*
|
|
* Allocate and attach a security structure to the file->f_security field. The
|
|
* security field is initialized to NULL when the structure is first created.
|
|
*
|
|
* Return: Return 0 if the hook is successful and permission is granted.
|
|
*/
|
|
int security_file_alloc(struct file *file)
|
|
{
|
|
int rc = lsm_file_alloc(file);
|
|
|
|
if (rc)
|
|
return rc;
|
|
rc = call_int_hook(file_alloc_security, 0, file);
|
|
if (unlikely(rc))
|
|
security_file_free(file);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* security_file_free() - Free a file's LSM blob
|
|
* @file: the file
|
|
*
|
|
* Deallocate and free any security structures stored in file->f_security.
|
|
*/
|
|
void security_file_free(struct file *file)
|
|
{
|
|
void *blob;
|
|
|
|
call_void_hook(file_free_security, file);
|
|
|
|
blob = file->f_security;
|
|
if (blob) {
|
|
file->f_security = NULL;
|
|
kmem_cache_free(lsm_file_cache, blob);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* security_file_ioctl() - Check if an ioctl is allowed
|
|
* @file: associated file
|
|
* @cmd: ioctl cmd
|
|
* @arg: ioctl arguments
|
|
*
|
|
* Check permission for an ioctl operation on @file. Note that @arg sometimes
|
|
* represents a user space pointer; in other cases, it may be a simple integer
|
|
* value. When @arg represents a user space pointer, it should never be used
|
|
* by the security module.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
return call_int_hook(file_ioctl, 0, file, cmd, arg);
|
|
}
|
|
EXPORT_SYMBOL_GPL(security_file_ioctl);
|
|
|
|
static inline unsigned long mmap_prot(struct file *file, unsigned long prot)
|
|
{
|
|
/*
|
|
* Does we have PROT_READ and does the application expect
|
|
* it to imply PROT_EXEC? If not, nothing to talk about...
|
|
*/
|
|
if ((prot & (PROT_READ | PROT_EXEC)) != PROT_READ)
|
|
return prot;
|
|
if (!(current->personality & READ_IMPLIES_EXEC))
|
|
return prot;
|
|
/*
|
|
* if that's an anonymous mapping, let it.
|
|
*/
|
|
if (!file)
|
|
return prot | PROT_EXEC;
|
|
/*
|
|
* ditto if it's not on noexec mount, except that on !MMU we need
|
|
* NOMMU_MAP_EXEC (== VM_MAYEXEC) in this case
|
|
*/
|
|
if (!path_noexec(&file->f_path)) {
|
|
#ifndef CONFIG_MMU
|
|
if (file->f_op->mmap_capabilities) {
|
|
unsigned caps = file->f_op->mmap_capabilities(file);
|
|
if (!(caps & NOMMU_MAP_EXEC))
|
|
return prot;
|
|
}
|
|
#endif
|
|
return prot | PROT_EXEC;
|
|
}
|
|
/* anything on noexec mount won't get PROT_EXEC */
|
|
return prot;
|
|
}
|
|
|
|
/**
|
|
* security_mmap_file() - Check if mmap'ing a file is allowed
|
|
* @file: file
|
|
* @prot: protection applied by the kernel
|
|
* @flags: flags
|
|
*
|
|
* Check permissions for a mmap operation. The @file may be NULL, e.g. if
|
|
* mapping anonymous memory.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_mmap_file(struct file *file, unsigned long prot,
|
|
unsigned long flags)
|
|
{
|
|
unsigned long prot_adj = mmap_prot(file, prot);
|
|
int ret;
|
|
|
|
ret = call_int_hook(mmap_file, 0, file, prot, prot_adj, flags);
|
|
if (ret)
|
|
return ret;
|
|
return ima_file_mmap(file, prot, prot_adj, flags);
|
|
}
|
|
|
|
/**
|
|
* security_mmap_addr() - Check if mmap'ing an address is allowed
|
|
* @addr: address
|
|
*
|
|
* Check permissions for a mmap operation at @addr.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_mmap_addr(unsigned long addr)
|
|
{
|
|
return call_int_hook(mmap_addr, 0, addr);
|
|
}
|
|
|
|
/**
|
|
* security_file_mprotect() - Check if changing memory protections is allowed
|
|
* @vma: memory region
|
|
* @reqprot: application requested protection
|
|
* @prot: protection applied by the kernel
|
|
*
|
|
* Check permissions before changing memory access permissions.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_file_mprotect(struct vm_area_struct *vma, unsigned long reqprot,
|
|
unsigned long prot)
|
|
{
|
|
int ret;
|
|
|
|
ret = call_int_hook(file_mprotect, 0, vma, reqprot, prot);
|
|
if (ret)
|
|
return ret;
|
|
return ima_file_mprotect(vma, prot);
|
|
}
|
|
|
|
/**
|
|
* security_file_lock() - Check if a file lock is allowed
|
|
* @file: file
|
|
* @cmd: lock operation (e.g. F_RDLCK, F_WRLCK)
|
|
*
|
|
* Check permission before performing file locking operations. Note the hook
|
|
* mediates both flock and fcntl style locks.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_file_lock(struct file *file, unsigned int cmd)
|
|
{
|
|
return call_int_hook(file_lock, 0, file, cmd);
|
|
}
|
|
|
|
/**
|
|
* security_file_fcntl() - Check if fcntl() op is allowed
|
|
* @file: file
|
|
* @cmd: fnctl command
|
|
* @arg: command argument
|
|
*
|
|
* Check permission before allowing the file operation specified by @cmd from
|
|
* being performed on the file @file. Note that @arg sometimes represents a
|
|
* user space pointer; in other cases, it may be a simple integer value. When
|
|
* @arg represents a user space pointer, it should never be used by the
|
|
* security module.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_file_fcntl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
return call_int_hook(file_fcntl, 0, file, cmd, arg);
|
|
}
|
|
|
|
/**
|
|
* security_file_set_fowner() - Set the file owner info in the LSM blob
|
|
* @file: the file
|
|
*
|
|
* Save owner security information (typically from current->security) in
|
|
* file->f_security for later use by the send_sigiotask hook.
|
|
*
|
|
* Return: Returns 0 on success.
|
|
*/
|
|
void security_file_set_fowner(struct file *file)
|
|
{
|
|
call_void_hook(file_set_fowner, file);
|
|
}
|
|
|
|
/**
|
|
* security_file_send_sigiotask() - Check if sending SIGIO/SIGURG is allowed
|
|
* @tsk: target task
|
|
* @fown: signal sender
|
|
* @sig: signal to be sent, SIGIO is sent if 0
|
|
*
|
|
* Check permission for the file owner @fown to send SIGIO or SIGURG to the
|
|
* process @tsk. Note that this hook is sometimes called from interrupt. Note
|
|
* that the fown_struct, @fown, is never outside the context of a struct file,
|
|
* so the file structure (and associated security information) can always be
|
|
* obtained: container_of(fown, struct file, f_owner).
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_file_send_sigiotask(struct task_struct *tsk,
|
|
struct fown_struct *fown, int sig)
|
|
{
|
|
return call_int_hook(file_send_sigiotask, 0, tsk, fown, sig);
|
|
}
|
|
|
|
/**
|
|
* security_file_receive() - Check is receiving a file via IPC is allowed
|
|
* @file: file being received
|
|
*
|
|
* This hook allows security modules to control the ability of a process to
|
|
* receive an open file descriptor via socket IPC.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_file_receive(struct file *file)
|
|
{
|
|
return call_int_hook(file_receive, 0, file);
|
|
}
|
|
|
|
/**
|
|
* security_file_open() - Save open() time state for late use by the LSM
|
|
* @file:
|
|
*
|
|
* Save open-time permission checking state for later use upon file_permission,
|
|
* and recheck access if anything has changed since inode_permission.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_file_open(struct file *file)
|
|
{
|
|
int ret;
|
|
|
|
ret = call_int_hook(file_open, 0, file);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return fsnotify_perm(file, MAY_OPEN);
|
|
}
|
|
|
|
/**
|
|
* security_file_truncate() - Check if truncating a file is allowed
|
|
* @file: file
|
|
*
|
|
* Check permission before truncating a file, i.e. using ftruncate. Note that
|
|
* truncation permission may also be checked based on the path, using the
|
|
* @path_truncate hook.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_file_truncate(struct file *file)
|
|
{
|
|
return call_int_hook(file_truncate, 0, file);
|
|
}
|
|
|
|
/**
|
|
* security_task_alloc() - Allocate a task's LSM blob
|
|
* @task: the task
|
|
* @clone_flags: flags indicating what is being shared
|
|
*
|
|
* Handle allocation of task-related resources.
|
|
*
|
|
* Return: Returns a zero on success, negative values on failure.
|
|
*/
|
|
int security_task_alloc(struct task_struct *task, unsigned long clone_flags)
|
|
{
|
|
int rc = lsm_task_alloc(task);
|
|
|
|
if (rc)
|
|
return rc;
|
|
rc = call_int_hook(task_alloc, 0, task, clone_flags);
|
|
if (unlikely(rc))
|
|
security_task_free(task);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* security_task_free() - Free a task's LSM blob and related resources
|
|
* @task: task
|
|
*
|
|
* Handle release of task-related resources. Note that this can be called from
|
|
* interrupt context.
|
|
*/
|
|
void security_task_free(struct task_struct *task)
|
|
{
|
|
call_void_hook(task_free, task);
|
|
|
|
kfree(task->security);
|
|
task->security = NULL;
|
|
}
|
|
|
|
/**
|
|
* security_cred_alloc_blank() - Allocate the min memory to allow cred_transfer
|
|
* @cred: credentials
|
|
* @gfp: gfp flags
|
|
*
|
|
* Only allocate sufficient memory and attach to @cred such that
|
|
* cred_transfer() will not get ENOMEM.
|
|
*
|
|
* Return: Returns 0 on success, negative values on failure.
|
|
*/
|
|
int security_cred_alloc_blank(struct cred *cred, gfp_t gfp)
|
|
{
|
|
int rc = lsm_cred_alloc(cred, gfp);
|
|
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = call_int_hook(cred_alloc_blank, 0, cred, gfp);
|
|
if (unlikely(rc))
|
|
security_cred_free(cred);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* security_cred_free() - Free the cred's LSM blob and associated resources
|
|
* @cred: credentials
|
|
*
|
|
* Deallocate and clear the cred->security field in a set of credentials.
|
|
*/
|
|
void security_cred_free(struct cred *cred)
|
|
{
|
|
/*
|
|
* There is a failure case in prepare_creds() that
|
|
* may result in a call here with ->security being NULL.
|
|
*/
|
|
if (unlikely(cred->security == NULL))
|
|
return;
|
|
|
|
call_void_hook(cred_free, cred);
|
|
|
|
kfree(cred->security);
|
|
cred->security = NULL;
|
|
}
|
|
|
|
/**
|
|
* security_prepare_creds() - Prepare a new set of credentials
|
|
* @new: new credentials
|
|
* @old: original credentials
|
|
* @gfp: gfp flags
|
|
*
|
|
* Prepare a new set of credentials by copying the data from the old set.
|
|
*
|
|
* Return: Returns 0 on success, negative values on failure.
|
|
*/
|
|
int security_prepare_creds(struct cred *new, const struct cred *old, gfp_t gfp)
|
|
{
|
|
int rc = lsm_cred_alloc(new, gfp);
|
|
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = call_int_hook(cred_prepare, 0, new, old, gfp);
|
|
if (unlikely(rc))
|
|
security_cred_free(new);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* security_transfer_creds() - Transfer creds
|
|
* @new: target credentials
|
|
* @old: original credentials
|
|
*
|
|
* Transfer data from original creds to new creds.
|
|
*/
|
|
void security_transfer_creds(struct cred *new, const struct cred *old)
|
|
{
|
|
call_void_hook(cred_transfer, new, old);
|
|
}
|
|
|
|
/**
|
|
* security_cred_getsecid() - Get the secid from a set of credentials
|
|
* @c: credentials
|
|
* @secid: secid value
|
|
*
|
|
* Retrieve the security identifier of the cred structure @c. In case of
|
|
* failure, @secid will be set to zero.
|
|
*/
|
|
void security_cred_getsecid(const struct cred *c, u32 *secid)
|
|
{
|
|
*secid = 0;
|
|
call_void_hook(cred_getsecid, c, secid);
|
|
}
|
|
EXPORT_SYMBOL(security_cred_getsecid);
|
|
|
|
/**
|
|
* security_kernel_act_as() - Set the kernel credentials to act as secid
|
|
* @new: credentials
|
|
* @secid: secid
|
|
*
|
|
* Set the credentials for a kernel service to act as (subjective context).
|
|
* The current task must be the one that nominated @secid.
|
|
*
|
|
* Return: Returns 0 if successful.
|
|
*/
|
|
int security_kernel_act_as(struct cred *new, u32 secid)
|
|
{
|
|
return call_int_hook(kernel_act_as, 0, new, secid);
|
|
}
|
|
|
|
/**
|
|
* security_kernel_create_files_as() - Set file creation context using an inode
|
|
* @new: target credentials
|
|
* @inode: reference inode
|
|
*
|
|
* Set the file creation context in a set of credentials to be the same as the
|
|
* objective context of the specified inode. The current task must be the one
|
|
* that nominated @inode.
|
|
*
|
|
* Return: Returns 0 if successful.
|
|
*/
|
|
int security_kernel_create_files_as(struct cred *new, struct inode *inode)
|
|
{
|
|
return call_int_hook(kernel_create_files_as, 0, new, inode);
|
|
}
|
|
|
|
/**
|
|
* security_kernel_module_request() - Check is loading a module is allowed
|
|
* @kmod_name: module name
|
|
*
|
|
* Ability to trigger the kernel to automatically upcall to userspace for
|
|
* userspace to load a kernel module with the given name.
|
|
*
|
|
* Return: Returns 0 if successful.
|
|
*/
|
|
int security_kernel_module_request(char *kmod_name)
|
|
{
|
|
int ret;
|
|
|
|
ret = call_int_hook(kernel_module_request, 0, kmod_name);
|
|
if (ret)
|
|
return ret;
|
|
return integrity_kernel_module_request(kmod_name);
|
|
}
|
|
|
|
/**
|
|
* security_kernel_read_file() - Read a file specified by userspace
|
|
* @file: file
|
|
* @id: file identifier
|
|
* @contents: trust if security_kernel_post_read_file() will be called
|
|
*
|
|
* Read a file specified by userspace.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_kernel_read_file(struct file *file, enum kernel_read_file_id id,
|
|
bool contents)
|
|
{
|
|
int ret;
|
|
|
|
ret = call_int_hook(kernel_read_file, 0, file, id, contents);
|
|
if (ret)
|
|
return ret;
|
|
return ima_read_file(file, id, contents);
|
|
}
|
|
EXPORT_SYMBOL_GPL(security_kernel_read_file);
|
|
|
|
/**
|
|
* security_kernel_post_read_file() - Read a file specified by userspace
|
|
* @file: file
|
|
* @buf: file contents
|
|
* @size: size of file contents
|
|
* @id: file identifier
|
|
*
|
|
* Read a file specified by userspace. This must be paired with a prior call
|
|
* to security_kernel_read_file() call that indicated this hook would also be
|
|
* called, see security_kernel_read_file() for more information.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_kernel_post_read_file(struct file *file, char *buf, loff_t size,
|
|
enum kernel_read_file_id id)
|
|
{
|
|
int ret;
|
|
|
|
ret = call_int_hook(kernel_post_read_file, 0, file, buf, size, id);
|
|
if (ret)
|
|
return ret;
|
|
return ima_post_read_file(file, buf, size, id);
|
|
}
|
|
EXPORT_SYMBOL_GPL(security_kernel_post_read_file);
|
|
|
|
/**
|
|
* security_kernel_load_data() - Load data provided by userspace
|
|
* @id: data identifier
|
|
* @contents: true if security_kernel_post_load_data() will be called
|
|
*
|
|
* Load data provided by userspace.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_kernel_load_data(enum kernel_load_data_id id, bool contents)
|
|
{
|
|
int ret;
|
|
|
|
ret = call_int_hook(kernel_load_data, 0, id, contents);
|
|
if (ret)
|
|
return ret;
|
|
return ima_load_data(id, contents);
|
|
}
|
|
EXPORT_SYMBOL_GPL(security_kernel_load_data);
|
|
|
|
/**
|
|
* security_kernel_post_load_data() - Load userspace data from a non-file source
|
|
* @buf: data
|
|
* @size: size of data
|
|
* @id: data identifier
|
|
* @description: text description of data, specific to the id value
|
|
*
|
|
* Load data provided by a non-file source (usually userspace buffer). This
|
|
* must be paired with a prior security_kernel_load_data() call that indicated
|
|
* this hook would also be called, see security_kernel_load_data() for more
|
|
* information.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_kernel_post_load_data(char *buf, loff_t size,
|
|
enum kernel_load_data_id id,
|
|
char *description)
|
|
{
|
|
int ret;
|
|
|
|
ret = call_int_hook(kernel_post_load_data, 0, buf, size, id,
|
|
description);
|
|
if (ret)
|
|
return ret;
|
|
return ima_post_load_data(buf, size, id, description);
|
|
}
|
|
EXPORT_SYMBOL_GPL(security_kernel_post_load_data);
|
|
|
|
/**
|
|
* security_task_fix_setuid() - Update LSM with new user id attributes
|
|
* @new: updated credentials
|
|
* @old: credentials being replaced
|
|
* @flags: LSM_SETID_* flag values
|
|
*
|
|
* Update the module's state after setting one or more of the user identity
|
|
* attributes of the current process. The @flags parameter indicates which of
|
|
* the set*uid system calls invoked this hook. If @new is the set of
|
|
* credentials that will be installed. Modifications should be made to this
|
|
* rather than to @current->cred.
|
|
*
|
|
* Return: Returns 0 on success.
|
|
*/
|
|
int security_task_fix_setuid(struct cred *new, const struct cred *old,
|
|
int flags)
|
|
{
|
|
return call_int_hook(task_fix_setuid, 0, new, old, flags);
|
|
}
|
|
|
|
/**
|
|
* security_task_fix_setgid() - Update LSM with new group id attributes
|
|
* @new: updated credentials
|
|
* @old: credentials being replaced
|
|
* @flags: LSM_SETID_* flag value
|
|
*
|
|
* Update the module's state after setting one or more of the group identity
|
|
* attributes of the current process. The @flags parameter indicates which of
|
|
* the set*gid system calls invoked this hook. @new is the set of credentials
|
|
* that will be installed. Modifications should be made to this rather than to
|
|
* @current->cred.
|
|
*
|
|
* Return: Returns 0 on success.
|
|
*/
|
|
int security_task_fix_setgid(struct cred *new, const struct cred *old,
|
|
int flags)
|
|
{
|
|
return call_int_hook(task_fix_setgid, 0, new, old, flags);
|
|
}
|
|
|
|
/**
|
|
* security_task_fix_setgroups() - Update LSM with new supplementary groups
|
|
* @new: updated credentials
|
|
* @old: credentials being replaced
|
|
*
|
|
* Update the module's state after setting the supplementary group identity
|
|
* attributes of the current process. @new is the set of credentials that will
|
|
* be installed. Modifications should be made to this rather than to
|
|
* @current->cred.
|
|
*
|
|
* Return: Returns 0 on success.
|
|
*/
|
|
int security_task_fix_setgroups(struct cred *new, const struct cred *old)
|
|
{
|
|
return call_int_hook(task_fix_setgroups, 0, new, old);
|
|
}
|
|
|
|
/**
|
|
* security_task_setpgid() - Check if setting the pgid is allowed
|
|
* @p: task being modified
|
|
* @pgid: new pgid
|
|
*
|
|
* Check permission before setting the process group identifier of the process
|
|
* @p to @pgid.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_task_setpgid(struct task_struct *p, pid_t pgid)
|
|
{
|
|
return call_int_hook(task_setpgid, 0, p, pgid);
|
|
}
|
|
|
|
/**
|
|
* security_task_getpgid() - Check if getting the pgid is allowed
|
|
* @p: task
|
|
*
|
|
* Check permission before getting the process group identifier of the process
|
|
* @p.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_task_getpgid(struct task_struct *p)
|
|
{
|
|
return call_int_hook(task_getpgid, 0, p);
|
|
}
|
|
|
|
/**
|
|
* security_task_getsid() - Check if getting the session id is allowed
|
|
* @p: task
|
|
*
|
|
* Check permission before getting the session identifier of the process @p.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_task_getsid(struct task_struct *p)
|
|
{
|
|
return call_int_hook(task_getsid, 0, p);
|
|
}
|
|
|
|
/**
|
|
* security_current_getsecid_subj() - Get the current task's subjective secid
|
|
* @secid: secid value
|
|
*
|
|
* Retrieve the subjective security identifier of the current task and return
|
|
* it in @secid. In case of failure, @secid will be set to zero.
|
|
*/
|
|
void security_current_getsecid_subj(u32 *secid)
|
|
{
|
|
*secid = 0;
|
|
call_void_hook(current_getsecid_subj, secid);
|
|
}
|
|
EXPORT_SYMBOL(security_current_getsecid_subj);
|
|
|
|
/**
|
|
* security_task_getsecid_obj() - Get a task's objective secid
|
|
* @p: target task
|
|
* @secid: secid value
|
|
*
|
|
* Retrieve the objective security identifier of the task_struct in @p and
|
|
* return it in @secid. In case of failure, @secid will be set to zero.
|
|
*/
|
|
void security_task_getsecid_obj(struct task_struct *p, u32 *secid)
|
|
{
|
|
*secid = 0;
|
|
call_void_hook(task_getsecid_obj, p, secid);
|
|
}
|
|
EXPORT_SYMBOL(security_task_getsecid_obj);
|
|
|
|
/**
|
|
* security_task_setnice() - Check if setting a task's nice value is allowed
|
|
* @p: target task
|
|
* @nice: nice value
|
|
*
|
|
* Check permission before setting the nice value of @p to @nice.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_task_setnice(struct task_struct *p, int nice)
|
|
{
|
|
return call_int_hook(task_setnice, 0, p, nice);
|
|
}
|
|
|
|
/**
|
|
* security_task_setioprio() - Check if setting a task's ioprio is allowed
|
|
* @p: target task
|
|
* @ioprio: ioprio value
|
|
*
|
|
* Check permission before setting the ioprio value of @p to @ioprio.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_task_setioprio(struct task_struct *p, int ioprio)
|
|
{
|
|
return call_int_hook(task_setioprio, 0, p, ioprio);
|
|
}
|
|
|
|
/**
|
|
* security_task_getioprio() - Check if getting a task's ioprio is allowed
|
|
* @p: task
|
|
*
|
|
* Check permission before getting the ioprio value of @p.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_task_getioprio(struct task_struct *p)
|
|
{
|
|
return call_int_hook(task_getioprio, 0, p);
|
|
}
|
|
|
|
/**
|
|
* security_task_prlimit() - Check if get/setting resources limits is allowed
|
|
* @cred: current task credentials
|
|
* @tcred: target task credentials
|
|
* @flags: LSM_PRLIMIT_* flag bits indicating a get/set/both
|
|
*
|
|
* Check permission before getting and/or setting the resource limits of
|
|
* another task.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_task_prlimit(const struct cred *cred, const struct cred *tcred,
|
|
unsigned int flags)
|
|
{
|
|
return call_int_hook(task_prlimit, 0, cred, tcred, flags);
|
|
}
|
|
|
|
/**
|
|
* security_task_setrlimit() - Check if setting a new rlimit value is allowed
|
|
* @p: target task's group leader
|
|
* @resource: resource whose limit is being set
|
|
* @new_rlim: new resource limit
|
|
*
|
|
* Check permission before setting the resource limits of process @p for
|
|
* @resource to @new_rlim. The old resource limit values can be examined by
|
|
* dereferencing (p->signal->rlim + resource).
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_task_setrlimit(struct task_struct *p, unsigned int resource,
|
|
struct rlimit *new_rlim)
|
|
{
|
|
return call_int_hook(task_setrlimit, 0, p, resource, new_rlim);
|
|
}
|
|
|
|
/**
|
|
* security_task_setscheduler() - Check if setting sched policy/param is allowed
|
|
* @p: target task
|
|
*
|
|
* Check permission before setting scheduling policy and/or parameters of
|
|
* process @p.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_task_setscheduler(struct task_struct *p)
|
|
{
|
|
return call_int_hook(task_setscheduler, 0, p);
|
|
}
|
|
|
|
/**
|
|
* security_task_getscheduler() - Check if getting scheduling info is allowed
|
|
* @p: target task
|
|
*
|
|
* Check permission before obtaining scheduling information for process @p.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_task_getscheduler(struct task_struct *p)
|
|
{
|
|
return call_int_hook(task_getscheduler, 0, p);
|
|
}
|
|
|
|
/**
|
|
* security_task_movememory() - Check if moving memory is allowed
|
|
* @p: task
|
|
*
|
|
* Check permission before moving memory owned by process @p.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_task_movememory(struct task_struct *p)
|
|
{
|
|
return call_int_hook(task_movememory, 0, p);
|
|
}
|
|
|
|
/**
|
|
* security_task_kill() - Check if sending a signal is allowed
|
|
* @p: target process
|
|
* @info: signal information
|
|
* @sig: signal value
|
|
* @cred: credentials of the signal sender, NULL if @current
|
|
*
|
|
* Check permission before sending signal @sig to @p. @info can be NULL, the
|
|
* constant 1, or a pointer to a kernel_siginfo structure. If @info is 1 or
|
|
* SI_FROMKERNEL(info) is true, then the signal should be viewed as coming from
|
|
* the kernel and should typically be permitted. SIGIO signals are handled
|
|
* separately by the send_sigiotask hook in file_security_ops.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_task_kill(struct task_struct *p, struct kernel_siginfo *info,
|
|
int sig, const struct cred *cred)
|
|
{
|
|
return call_int_hook(task_kill, 0, p, info, sig, cred);
|
|
}
|
|
|
|
/**
|
|
* security_task_prctl() - Check if a prctl op is allowed
|
|
* @option: operation
|
|
* @arg2: argument
|
|
* @arg3: argument
|
|
* @arg4: argument
|
|
* @arg5: argument
|
|
*
|
|
* Check permission before performing a process control operation on the
|
|
* current process.
|
|
*
|
|
* Return: Return -ENOSYS if no-one wanted to handle this op, any other value
|
|
* to cause prctl() to return immediately with that value.
|
|
*/
|
|
int security_task_prctl(int option, unsigned long arg2, unsigned long arg3,
|
|
unsigned long arg4, unsigned long arg5)
|
|
{
|
|
int thisrc;
|
|
int rc = LSM_RET_DEFAULT(task_prctl);
|
|
struct security_hook_list *hp;
|
|
|
|
hlist_for_each_entry(hp, &security_hook_heads.task_prctl, list) {
|
|
thisrc = hp->hook.task_prctl(option, arg2, arg3, arg4, arg5);
|
|
if (thisrc != LSM_RET_DEFAULT(task_prctl)) {
|
|
rc = thisrc;
|
|
if (thisrc != 0)
|
|
break;
|
|
}
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* security_task_to_inode() - Set the security attributes of a task's inode
|
|
* @p: task
|
|
* @inode: inode
|
|
*
|
|
* Set the security attributes for an inode based on an associated task's
|
|
* security attributes, e.g. for /proc/pid inodes.
|
|
*/
|
|
void security_task_to_inode(struct task_struct *p, struct inode *inode)
|
|
{
|
|
call_void_hook(task_to_inode, p, inode);
|
|
}
|
|
|
|
/**
|
|
* security_create_user_ns() - Check if creating a new userns is allowed
|
|
* @cred: prepared creds
|
|
*
|
|
* Check permission prior to creating a new user namespace.
|
|
*
|
|
* Return: Returns 0 if successful, otherwise < 0 error code.
|
|
*/
|
|
int security_create_user_ns(const struct cred *cred)
|
|
{
|
|
return call_int_hook(userns_create, 0, cred);
|
|
}
|
|
|
|
/**
|
|
* security_ipc_permission() - Check if sysv ipc access is allowed
|
|
* @ipcp: ipc permission structure
|
|
* @flag: requested permissions
|
|
*
|
|
* Check permissions for access to IPC.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_ipc_permission(struct kern_ipc_perm *ipcp, short flag)
|
|
{
|
|
return call_int_hook(ipc_permission, 0, ipcp, flag);
|
|
}
|
|
|
|
/**
|
|
* security_ipc_getsecid() - Get the sysv ipc object's secid
|
|
* @ipcp: ipc permission structure
|
|
* @secid: secid pointer
|
|
*
|
|
* Get the secid associated with the ipc object. In case of failure, @secid
|
|
* will be set to zero.
|
|
*/
|
|
void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid)
|
|
{
|
|
*secid = 0;
|
|
call_void_hook(ipc_getsecid, ipcp, secid);
|
|
}
|
|
|
|
/**
|
|
* security_msg_msg_alloc() - Allocate a sysv ipc message LSM blob
|
|
* @msg: message structure
|
|
*
|
|
* Allocate and attach a security structure to the msg->security field. The
|
|
* security field is initialized to NULL when the structure is first created.
|
|
*
|
|
* Return: Return 0 if operation was successful and permission is granted.
|
|
*/
|
|
int security_msg_msg_alloc(struct msg_msg *msg)
|
|
{
|
|
int rc = lsm_msg_msg_alloc(msg);
|
|
|
|
if (unlikely(rc))
|
|
return rc;
|
|
rc = call_int_hook(msg_msg_alloc_security, 0, msg);
|
|
if (unlikely(rc))
|
|
security_msg_msg_free(msg);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* security_msg_msg_free() - Free a sysv ipc message LSM blob
|
|
* @msg: message structure
|
|
*
|
|
* Deallocate the security structure for this message.
|
|
*/
|
|
void security_msg_msg_free(struct msg_msg *msg)
|
|
{
|
|
call_void_hook(msg_msg_free_security, msg);
|
|
kfree(msg->security);
|
|
msg->security = NULL;
|
|
}
|
|
|
|
/**
|
|
* security_msg_queue_alloc() - Allocate a sysv ipc msg queue LSM blob
|
|
* @msq: sysv ipc permission structure
|
|
*
|
|
* Allocate and attach a security structure to @msg. The security field is
|
|
* initialized to NULL when the structure is first created.
|
|
*
|
|
* Return: Returns 0 if operation was successful and permission is granted.
|
|
*/
|
|
int security_msg_queue_alloc(struct kern_ipc_perm *msq)
|
|
{
|
|
int rc = lsm_ipc_alloc(msq);
|
|
|
|
if (unlikely(rc))
|
|
return rc;
|
|
rc = call_int_hook(msg_queue_alloc_security, 0, msq);
|
|
if (unlikely(rc))
|
|
security_msg_queue_free(msq);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* security_msg_queue_free() - Free a sysv ipc msg queue LSM blob
|
|
* @msq: sysv ipc permission structure
|
|
*
|
|
* Deallocate security field @perm->security for the message queue.
|
|
*/
|
|
void security_msg_queue_free(struct kern_ipc_perm *msq)
|
|
{
|
|
call_void_hook(msg_queue_free_security, msq);
|
|
kfree(msq->security);
|
|
msq->security = NULL;
|
|
}
|
|
|
|
/**
|
|
* security_msg_queue_associate() - Check if a msg queue operation is allowed
|
|
* @msq: sysv ipc permission structure
|
|
* @msqflg: operation flags
|
|
*
|
|
* Check permission when a message queue is requested through the msgget system
|
|
* call. This hook is only called when returning the message queue identifier
|
|
* for an existing message queue, not when a new message queue is created.
|
|
*
|
|
* Return: Return 0 if permission is granted.
|
|
*/
|
|
int security_msg_queue_associate(struct kern_ipc_perm *msq, int msqflg)
|
|
{
|
|
return call_int_hook(msg_queue_associate, 0, msq, msqflg);
|
|
}
|
|
|
|
/**
|
|
* security_msg_queue_msgctl() - Check if a msg queue operation is allowed
|
|
* @msq: sysv ipc permission structure
|
|
* @cmd: operation
|
|
*
|
|
* Check permission when a message control operation specified by @cmd is to be
|
|
* performed on the message queue with permissions.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_msg_queue_msgctl(struct kern_ipc_perm *msq, int cmd)
|
|
{
|
|
return call_int_hook(msg_queue_msgctl, 0, msq, cmd);
|
|
}
|
|
|
|
/**
|
|
* security_msg_queue_msgsnd() - Check if sending a sysv ipc message is allowed
|
|
* @msq: sysv ipc permission structure
|
|
* @msg: message
|
|
* @msqflg: operation flags
|
|
*
|
|
* Check permission before a message, @msg, is enqueued on the message queue
|
|
* with permissions specified in @msq.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_msg_queue_msgsnd(struct kern_ipc_perm *msq,
|
|
struct msg_msg *msg, int msqflg)
|
|
{
|
|
return call_int_hook(msg_queue_msgsnd, 0, msq, msg, msqflg);
|
|
}
|
|
|
|
/**
|
|
* security_msg_queue_msgrcv() - Check if receiving a sysv ipc msg is allowed
|
|
* @msq: sysv ipc permission structure
|
|
* @msg: message
|
|
* @target: target task
|
|
* @type: type of message requested
|
|
* @mode: operation flags
|
|
*
|
|
* Check permission before a message, @msg, is removed from the message queue.
|
|
* The @target task structure contains a pointer to the process that will be
|
|
* receiving the message (not equal to the current process when inline receives
|
|
* are being performed).
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_msg_queue_msgrcv(struct kern_ipc_perm *msq, struct msg_msg *msg,
|
|
struct task_struct *target, long type, int mode)
|
|
{
|
|
return call_int_hook(msg_queue_msgrcv, 0, msq, msg, target, type, mode);
|
|
}
|
|
|
|
/**
|
|
* security_shm_alloc() - Allocate a sysv shm LSM blob
|
|
* @shp: sysv ipc permission structure
|
|
*
|
|
* Allocate and attach a security structure to the @shp security field. The
|
|
* security field is initialized to NULL when the structure is first created.
|
|
*
|
|
* Return: Returns 0 if operation was successful and permission is granted.
|
|
*/
|
|
int security_shm_alloc(struct kern_ipc_perm *shp)
|
|
{
|
|
int rc = lsm_ipc_alloc(shp);
|
|
|
|
if (unlikely(rc))
|
|
return rc;
|
|
rc = call_int_hook(shm_alloc_security, 0, shp);
|
|
if (unlikely(rc))
|
|
security_shm_free(shp);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* security_shm_free() - Free a sysv shm LSM blob
|
|
* @shp: sysv ipc permission structure
|
|
*
|
|
* Deallocate the security structure @perm->security for the memory segment.
|
|
*/
|
|
void security_shm_free(struct kern_ipc_perm *shp)
|
|
{
|
|
call_void_hook(shm_free_security, shp);
|
|
kfree(shp->security);
|
|
shp->security = NULL;
|
|
}
|
|
|
|
/**
|
|
* security_shm_associate() - Check if a sysv shm operation is allowed
|
|
* @shp: sysv ipc permission structure
|
|
* @shmflg: operation flags
|
|
*
|
|
* Check permission when a shared memory region is requested through the shmget
|
|
* system call. This hook is only called when returning the shared memory
|
|
* region identifier for an existing region, not when a new shared memory
|
|
* region is created.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_shm_associate(struct kern_ipc_perm *shp, int shmflg)
|
|
{
|
|
return call_int_hook(shm_associate, 0, shp, shmflg);
|
|
}
|
|
|
|
/**
|
|
* security_shm_shmctl() - Check if a sysv shm operation is allowed
|
|
* @shp: sysv ipc permission structure
|
|
* @cmd: operation
|
|
*
|
|
* Check permission when a shared memory control operation specified by @cmd is
|
|
* to be performed on the shared memory region with permissions in @shp.
|
|
*
|
|
* Return: Return 0 if permission is granted.
|
|
*/
|
|
int security_shm_shmctl(struct kern_ipc_perm *shp, int cmd)
|
|
{
|
|
return call_int_hook(shm_shmctl, 0, shp, cmd);
|
|
}
|
|
|
|
/**
|
|
* security_shm_shmat() - Check if a sysv shm attach operation is allowed
|
|
* @shp: sysv ipc permission structure
|
|
* @shmaddr: address of memory region to attach
|
|
* @shmflg: operation flags
|
|
*
|
|
* Check permissions prior to allowing the shmat system call to attach the
|
|
* shared memory segment with permissions @shp to the data segment of the
|
|
* calling process. The attaching address is specified by @shmaddr.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_shm_shmat(struct kern_ipc_perm *shp,
|
|
char __user *shmaddr, int shmflg)
|
|
{
|
|
return call_int_hook(shm_shmat, 0, shp, shmaddr, shmflg);
|
|
}
|
|
|
|
/**
|
|
* security_sem_alloc() - Allocate a sysv semaphore LSM blob
|
|
* @sma: sysv ipc permission structure
|
|
*
|
|
* Allocate and attach a security structure to the @sma security field. The
|
|
* security field is initialized to NULL when the structure is first created.
|
|
*
|
|
* Return: Returns 0 if operation was successful and permission is granted.
|
|
*/
|
|
int security_sem_alloc(struct kern_ipc_perm *sma)
|
|
{
|
|
int rc = lsm_ipc_alloc(sma);
|
|
|
|
if (unlikely(rc))
|
|
return rc;
|
|
rc = call_int_hook(sem_alloc_security, 0, sma);
|
|
if (unlikely(rc))
|
|
security_sem_free(sma);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* security_sem_free() - Free a sysv semaphore LSM blob
|
|
* @sma: sysv ipc permission structure
|
|
*
|
|
* Deallocate security structure @sma->security for the semaphore.
|
|
*/
|
|
void security_sem_free(struct kern_ipc_perm *sma)
|
|
{
|
|
call_void_hook(sem_free_security, sma);
|
|
kfree(sma->security);
|
|
sma->security = NULL;
|
|
}
|
|
|
|
/**
|
|
* security_sem_associate() - Check if a sysv semaphore operation is allowed
|
|
* @sma: sysv ipc permission structure
|
|
* @semflg: operation flags
|
|
*
|
|
* Check permission when a semaphore is requested through the semget system
|
|
* call. This hook is only called when returning the semaphore identifier for
|
|
* an existing semaphore, not when a new one must be created.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_sem_associate(struct kern_ipc_perm *sma, int semflg)
|
|
{
|
|
return call_int_hook(sem_associate, 0, sma, semflg);
|
|
}
|
|
|
|
/**
|
|
* security_sem_semctl() - Check if a sysv semaphore operation is allowed
|
|
* @sma: sysv ipc permission structure
|
|
* @cmd: operation
|
|
*
|
|
* Check permission when a semaphore operation specified by @cmd is to be
|
|
* performed on the semaphore.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_sem_semctl(struct kern_ipc_perm *sma, int cmd)
|
|
{
|
|
return call_int_hook(sem_semctl, 0, sma, cmd);
|
|
}
|
|
|
|
/**
|
|
* security_sem_semop() - Check if a sysv semaphore operation is allowed
|
|
* @sma: sysv ipc permission structure
|
|
* @sops: operations to perform
|
|
* @nsops: number of operations
|
|
* @alter: flag indicating changes will be made
|
|
*
|
|
* Check permissions before performing operations on members of the semaphore
|
|
* set. If the @alter flag is nonzero, the semaphore set may be modified.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_sem_semop(struct kern_ipc_perm *sma, struct sembuf *sops,
|
|
unsigned nsops, int alter)
|
|
{
|
|
return call_int_hook(sem_semop, 0, sma, sops, nsops, alter);
|
|
}
|
|
|
|
/**
|
|
* security_d_instantiate() - Populate an inode's LSM state based on a dentry
|
|
* @dentry: dentry
|
|
* @inode: inode
|
|
*
|
|
* Fill in @inode security information for a @dentry if allowed.
|
|
*/
|
|
void security_d_instantiate(struct dentry *dentry, struct inode *inode)
|
|
{
|
|
if (unlikely(inode && IS_PRIVATE(inode)))
|
|
return;
|
|
call_void_hook(d_instantiate, dentry, inode);
|
|
}
|
|
EXPORT_SYMBOL(security_d_instantiate);
|
|
|
|
/**
|
|
* security_getprocattr() - Read an attribute for a task
|
|
* @p: the task
|
|
* @lsm: LSM name
|
|
* @name: attribute name
|
|
* @value: attribute value
|
|
*
|
|
* Read attribute @name for task @p and store it into @value if allowed.
|
|
*
|
|
* Return: Returns the length of @value on success, a negative value otherwise.
|
|
*/
|
|
int security_getprocattr(struct task_struct *p, const char *lsm,
|
|
const char *name, char **value)
|
|
{
|
|
struct security_hook_list *hp;
|
|
|
|
hlist_for_each_entry(hp, &security_hook_heads.getprocattr, list) {
|
|
if (lsm != NULL && strcmp(lsm, hp->lsm))
|
|
continue;
|
|
return hp->hook.getprocattr(p, name, value);
|
|
}
|
|
return LSM_RET_DEFAULT(getprocattr);
|
|
}
|
|
|
|
/**
|
|
* security_setprocattr() - Set an attribute for a task
|
|
* @lsm: LSM name
|
|
* @name: attribute name
|
|
* @value: attribute value
|
|
* @size: attribute value size
|
|
*
|
|
* Write (set) the current task's attribute @name to @value, size @size if
|
|
* allowed.
|
|
*
|
|
* Return: Returns bytes written on success, a negative value otherwise.
|
|
*/
|
|
int security_setprocattr(const char *lsm, const char *name, void *value,
|
|
size_t size)
|
|
{
|
|
struct security_hook_list *hp;
|
|
|
|
hlist_for_each_entry(hp, &security_hook_heads.setprocattr, list) {
|
|
if (lsm != NULL && strcmp(lsm, hp->lsm))
|
|
continue;
|
|
return hp->hook.setprocattr(name, value, size);
|
|
}
|
|
return LSM_RET_DEFAULT(setprocattr);
|
|
}
|
|
|
|
/**
|
|
* security_netlink_send() - Save info and check if netlink sending is allowed
|
|
* @sk: sending socket
|
|
* @skb: netlink message
|
|
*
|
|
* Save security information for a netlink message so that permission checking
|
|
* can be performed when the message is processed. The security information
|
|
* can be saved using the eff_cap field of the netlink_skb_parms structure.
|
|
* Also may be used to provide fine grained control over message transmission.
|
|
*
|
|
* Return: Returns 0 if the information was successfully saved and message is
|
|
* allowed to be transmitted.
|
|
*/
|
|
int security_netlink_send(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
return call_int_hook(netlink_send, 0, sk, skb);
|
|
}
|
|
|
|
/**
|
|
* security_ismaclabel() - Check is the named attribute is a MAC label
|
|
* @name: full extended attribute name
|
|
*
|
|
* Check if the extended attribute specified by @name represents a MAC label.
|
|
*
|
|
* Return: Returns 1 if name is a MAC attribute otherwise returns 0.
|
|
*/
|
|
int security_ismaclabel(const char *name)
|
|
{
|
|
return call_int_hook(ismaclabel, 0, name);
|
|
}
|
|
EXPORT_SYMBOL(security_ismaclabel);
|
|
|
|
/**
|
|
* security_secid_to_secctx() - Convert a secid to a secctx
|
|
* @secid: secid
|
|
* @secdata: secctx
|
|
* @seclen: secctx length
|
|
*
|
|
* Convert secid to security context. If @secdata is NULL the length of the
|
|
* result will be returned in @seclen, but no @secdata will be returned. This
|
|
* does mean that the length could change between calls to check the length and
|
|
* the next call which actually allocates and returns the @secdata.
|
|
*
|
|
* Return: Return 0 on success, error on failure.
|
|
*/
|
|
int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
|
|
{
|
|
struct security_hook_list *hp;
|
|
int rc;
|
|
|
|
/*
|
|
* Currently, only one LSM can implement secid_to_secctx (i.e this
|
|
* LSM hook is not "stackable").
|
|
*/
|
|
hlist_for_each_entry(hp, &security_hook_heads.secid_to_secctx, list) {
|
|
rc = hp->hook.secid_to_secctx(secid, secdata, seclen);
|
|
if (rc != LSM_RET_DEFAULT(secid_to_secctx))
|
|
return rc;
|
|
}
|
|
|
|
return LSM_RET_DEFAULT(secid_to_secctx);
|
|
}
|
|
EXPORT_SYMBOL(security_secid_to_secctx);
|
|
|
|
/**
|
|
* security_secctx_to_secid() - Convert a secctx to a secid
|
|
* @secdata: secctx
|
|
* @seclen: length of secctx
|
|
* @secid: secid
|
|
*
|
|
* Convert security context to secid.
|
|
*
|
|
* Return: Returns 0 on success, error on failure.
|
|
*/
|
|
int security_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
|
|
{
|
|
*secid = 0;
|
|
return call_int_hook(secctx_to_secid, 0, secdata, seclen, secid);
|
|
}
|
|
EXPORT_SYMBOL(security_secctx_to_secid);
|
|
|
|
/**
|
|
* security_release_secctx() - Free a secctx buffer
|
|
* @secdata: secctx
|
|
* @seclen: length of secctx
|
|
*
|
|
* Release the security context.
|
|
*/
|
|
void security_release_secctx(char *secdata, u32 seclen)
|
|
{
|
|
call_void_hook(release_secctx, secdata, seclen);
|
|
}
|
|
EXPORT_SYMBOL(security_release_secctx);
|
|
|
|
/**
|
|
* security_inode_invalidate_secctx() - Invalidate an inode's security label
|
|
* @inode: inode
|
|
*
|
|
* Notify the security module that it must revalidate the security context of
|
|
* an inode.
|
|
*/
|
|
void security_inode_invalidate_secctx(struct inode *inode)
|
|
{
|
|
call_void_hook(inode_invalidate_secctx, inode);
|
|
}
|
|
EXPORT_SYMBOL(security_inode_invalidate_secctx);
|
|
|
|
/**
|
|
* security_inode_notifysecctx() - Nofify the LSM of an inode's security label
|
|
* @inode: inode
|
|
* @ctx: secctx
|
|
* @ctxlen: length of secctx
|
|
*
|
|
* Notify the security module of what the security context of an inode should
|
|
* be. Initializes the incore security context managed by the security module
|
|
* for this inode. Example usage: NFS client invokes this hook to initialize
|
|
* the security context in its incore inode to the value provided by the server
|
|
* for the file when the server returned the file's attributes to the client.
|
|
* Must be called with inode->i_mutex locked.
|
|
*
|
|
* Return: Returns 0 on success, error on failure.
|
|
*/
|
|
int security_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
|
|
{
|
|
return call_int_hook(inode_notifysecctx, 0, inode, ctx, ctxlen);
|
|
}
|
|
EXPORT_SYMBOL(security_inode_notifysecctx);
|
|
|
|
/**
|
|
* security_inode_setsecctx() - Change the security label of an inode
|
|
* @dentry: inode
|
|
* @ctx: secctx
|
|
* @ctxlen: length of secctx
|
|
*
|
|
* Change the security context of an inode. Updates the incore security
|
|
* context managed by the security module and invokes the fs code as needed
|
|
* (via __vfs_setxattr_noperm) to update any backing xattrs that represent the
|
|
* context. Example usage: NFS server invokes this hook to change the security
|
|
* context in its incore inode and on the backing filesystem to a value
|
|
* provided by the client on a SETATTR operation. Must be called with
|
|
* inode->i_mutex locked.
|
|
*
|
|
* Return: Returns 0 on success, error on failure.
|
|
*/
|
|
int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
|
|
{
|
|
return call_int_hook(inode_setsecctx, 0, dentry, ctx, ctxlen);
|
|
}
|
|
EXPORT_SYMBOL(security_inode_setsecctx);
|
|
|
|
/**
|
|
* security_inode_getsecctx() - Get the security label of an inode
|
|
* @inode: inode
|
|
* @ctx: secctx
|
|
* @ctxlen: length of secctx
|
|
*
|
|
* On success, returns 0 and fills out @ctx and @ctxlen with the security
|
|
* context for the given @inode.
|
|
*
|
|
* Return: Returns 0 on success, error on failure.
|
|
*/
|
|
int security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
|
|
{
|
|
return call_int_hook(inode_getsecctx, -EOPNOTSUPP, inode, ctx, ctxlen);
|
|
}
|
|
EXPORT_SYMBOL(security_inode_getsecctx);
|
|
|
|
#ifdef CONFIG_WATCH_QUEUE
|
|
/**
|
|
* security_post_notification() - Check if a watch notification can be posted
|
|
* @w_cred: credentials of the task that set the watch
|
|
* @cred: credentials of the task which triggered the watch
|
|
* @n: the notification
|
|
*
|
|
* Check to see if a watch notification can be posted to a particular queue.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_post_notification(const struct cred *w_cred,
|
|
const struct cred *cred,
|
|
struct watch_notification *n)
|
|
{
|
|
return call_int_hook(post_notification, 0, w_cred, cred, n);
|
|
}
|
|
#endif /* CONFIG_WATCH_QUEUE */
|
|
|
|
#ifdef CONFIG_KEY_NOTIFICATIONS
|
|
/**
|
|
* security_watch_key() - Check if a task is allowed to watch for key events
|
|
* @key: the key to watch
|
|
*
|
|
* Check to see if a process is allowed to watch for event notifications from
|
|
* a key or keyring.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_watch_key(struct key *key)
|
|
{
|
|
return call_int_hook(watch_key, 0, key);
|
|
}
|
|
#endif /* CONFIG_KEY_NOTIFICATIONS */
|
|
|
|
#ifdef CONFIG_SECURITY_NETWORK
|
|
/**
|
|
* security_unix_stream_connect() - Check if a AF_UNIX stream is allowed
|
|
* @sock: originating sock
|
|
* @other: peer sock
|
|
* @newsk: new sock
|
|
*
|
|
* Check permissions before establishing a Unix domain stream connection
|
|
* between @sock and @other.
|
|
*
|
|
* The @unix_stream_connect and @unix_may_send hooks were necessary because
|
|
* Linux provides an alternative to the conventional file name space for Unix
|
|
* domain sockets. Whereas binding and connecting to sockets in the file name
|
|
* space is mediated by the typical file permissions (and caught by the mknod
|
|
* and permission hooks in inode_security_ops), binding and connecting to
|
|
* sockets in the abstract name space is completely unmediated. Sufficient
|
|
* control of Unix domain sockets in the abstract name space isn't possible
|
|
* using only the socket layer hooks, since we need to know the actual target
|
|
* socket, which is not looked up until we are inside the af_unix code.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_unix_stream_connect(struct sock *sock, struct sock *other,
|
|
struct sock *newsk)
|
|
{
|
|
return call_int_hook(unix_stream_connect, 0, sock, other, newsk);
|
|
}
|
|
EXPORT_SYMBOL(security_unix_stream_connect);
|
|
|
|
/**
|
|
* security_unix_may_send() - Check if AF_UNIX socket can send datagrams
|
|
* @sock: originating sock
|
|
* @other: peer sock
|
|
*
|
|
* Check permissions before connecting or sending datagrams from @sock to
|
|
* @other.
|
|
*
|
|
* The @unix_stream_connect and @unix_may_send hooks were necessary because
|
|
* Linux provides an alternative to the conventional file name space for Unix
|
|
* domain sockets. Whereas binding and connecting to sockets in the file name
|
|
* space is mediated by the typical file permissions (and caught by the mknod
|
|
* and permission hooks in inode_security_ops), binding and connecting to
|
|
* sockets in the abstract name space is completely unmediated. Sufficient
|
|
* control of Unix domain sockets in the abstract name space isn't possible
|
|
* using only the socket layer hooks, since we need to know the actual target
|
|
* socket, which is not looked up until we are inside the af_unix code.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_unix_may_send(struct socket *sock, struct socket *other)
|
|
{
|
|
return call_int_hook(unix_may_send, 0, sock, other);
|
|
}
|
|
EXPORT_SYMBOL(security_unix_may_send);
|
|
|
|
/**
|
|
* security_socket_create() - Check if creating a new socket is allowed
|
|
* @family: protocol family
|
|
* @type: communications type
|
|
* @protocol: requested protocol
|
|
* @kern: set to 1 if a kernel socket is requested
|
|
*
|
|
* Check permissions prior to creating a new socket.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_socket_create(int family, int type, int protocol, int kern)
|
|
{
|
|
return call_int_hook(socket_create, 0, family, type, protocol, kern);
|
|
}
|
|
|
|
/**
|
|
* security_socket_post_create() - Initialize a newly created socket
|
|
* @sock: socket
|
|
* @family: protocol family
|
|
* @type: communications type
|
|
* @protocol: requested protocol
|
|
* @kern: set to 1 if a kernel socket is requested
|
|
*
|
|
* This hook allows a module to update or allocate a per-socket security
|
|
* structure. Note that the security field was not added directly to the socket
|
|
* structure, but rather, the socket security information is stored in the
|
|
* associated inode. Typically, the inode alloc_security hook will allocate
|
|
* and attach security information to SOCK_INODE(sock)->i_security. This hook
|
|
* may be used to update the SOCK_INODE(sock)->i_security field with additional
|
|
* information that wasn't available when the inode was allocated.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_socket_post_create(struct socket *sock, int family,
|
|
int type, int protocol, int kern)
|
|
{
|
|
return call_int_hook(socket_post_create, 0, sock, family, type,
|
|
protocol, kern);
|
|
}
|
|
|
|
/**
|
|
* security_socket_socketpair() - Check if creating a socketpair is allowed
|
|
* @socka: first socket
|
|
* @sockb: second socket
|
|
*
|
|
* Check permissions before creating a fresh pair of sockets.
|
|
*
|
|
* Return: Returns 0 if permission is granted and the connection was
|
|
* established.
|
|
*/
|
|
int security_socket_socketpair(struct socket *socka, struct socket *sockb)
|
|
{
|
|
return call_int_hook(socket_socketpair, 0, socka, sockb);
|
|
}
|
|
EXPORT_SYMBOL(security_socket_socketpair);
|
|
|
|
/**
|
|
* security_socket_bind() - Check if a socket bind operation is allowed
|
|
* @sock: socket
|
|
* @address: requested bind address
|
|
* @addrlen: length of address
|
|
*
|
|
* Check permission before socket protocol layer bind operation is performed
|
|
* and the socket @sock is bound to the address specified in the @address
|
|
* parameter.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_socket_bind(struct socket *sock,
|
|
struct sockaddr *address, int addrlen)
|
|
{
|
|
return call_int_hook(socket_bind, 0, sock, address, addrlen);
|
|
}
|
|
|
|
/**
|
|
* security_socket_connect() - Check if a socket connect operation is allowed
|
|
* @sock: socket
|
|
* @address: address of remote connection point
|
|
* @addrlen: length of address
|
|
*
|
|
* Check permission before socket protocol layer connect operation attempts to
|
|
* connect socket @sock to a remote address, @address.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_socket_connect(struct socket *sock,
|
|
struct sockaddr *address, int addrlen)
|
|
{
|
|
return call_int_hook(socket_connect, 0, sock, address, addrlen);
|
|
}
|
|
|
|
/**
|
|
* security_socket_listen() - Check if a socket is allowed to listen
|
|
* @sock: socket
|
|
* @backlog: connection queue size
|
|
*
|
|
* Check permission before socket protocol layer listen operation.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_socket_listen(struct socket *sock, int backlog)
|
|
{
|
|
return call_int_hook(socket_listen, 0, sock, backlog);
|
|
}
|
|
|
|
/**
|
|
* security_socket_accept() - Check if a socket is allowed to accept connections
|
|
* @sock: listening socket
|
|
* @newsock: newly creation connection socket
|
|
*
|
|
* Check permission before accepting a new connection. Note that the new
|
|
* socket, @newsock, has been created and some information copied to it, but
|
|
* the accept operation has not actually been performed.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_socket_accept(struct socket *sock, struct socket *newsock)
|
|
{
|
|
return call_int_hook(socket_accept, 0, sock, newsock);
|
|
}
|
|
|
|
/**
|
|
* security_socket_sendmsg() - Check is sending a message is allowed
|
|
* @sock: sending socket
|
|
* @msg: message to send
|
|
* @size: size of message
|
|
*
|
|
* Check permission before transmitting a message to another socket.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_socket_sendmsg(struct socket *sock, struct msghdr *msg, int size)
|
|
{
|
|
return call_int_hook(socket_sendmsg, 0, sock, msg, size);
|
|
}
|
|
|
|
/**
|
|
* security_socket_recvmsg() - Check if receiving a message is allowed
|
|
* @sock: receiving socket
|
|
* @msg: message to receive
|
|
* @size: size of message
|
|
* @flags: operational flags
|
|
*
|
|
* Check permission before receiving a message from a socket.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_socket_recvmsg(struct socket *sock, struct msghdr *msg,
|
|
int size, int flags)
|
|
{
|
|
return call_int_hook(socket_recvmsg, 0, sock, msg, size, flags);
|
|
}
|
|
|
|
/**
|
|
* security_socket_getsockname() - Check if reading the socket addr is allowed
|
|
* @sock: socket
|
|
*
|
|
* Check permission before reading the local address (name) of the socket
|
|
* object.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_socket_getsockname(struct socket *sock)
|
|
{
|
|
return call_int_hook(socket_getsockname, 0, sock);
|
|
}
|
|
|
|
/**
|
|
* security_socket_getpeername() - Check if reading the peer's addr is allowed
|
|
* @sock: socket
|
|
*
|
|
* Check permission before the remote address (name) of a socket object.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_socket_getpeername(struct socket *sock)
|
|
{
|
|
return call_int_hook(socket_getpeername, 0, sock);
|
|
}
|
|
|
|
/**
|
|
* security_socket_getsockopt() - Check if reading a socket option is allowed
|
|
* @sock: socket
|
|
* @level: option's protocol level
|
|
* @optname: option name
|
|
*
|
|
* Check permissions before retrieving the options associated with socket
|
|
* @sock.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_socket_getsockopt(struct socket *sock, int level, int optname)
|
|
{
|
|
return call_int_hook(socket_getsockopt, 0, sock, level, optname);
|
|
}
|
|
|
|
/**
|
|
* security_socket_setsockopt() - Check if setting a socket option is allowed
|
|
* @sock: socket
|
|
* @level: option's protocol level
|
|
* @optname: option name
|
|
*
|
|
* Check permissions before setting the options associated with socket @sock.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_socket_setsockopt(struct socket *sock, int level, int optname)
|
|
{
|
|
return call_int_hook(socket_setsockopt, 0, sock, level, optname);
|
|
}
|
|
|
|
/**
|
|
* security_socket_shutdown() - Checks if shutting down the socket is allowed
|
|
* @sock: socket
|
|
* @how: flag indicating how sends and receives are handled
|
|
*
|
|
* Checks permission before all or part of a connection on the socket @sock is
|
|
* shut down.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_socket_shutdown(struct socket *sock, int how)
|
|
{
|
|
return call_int_hook(socket_shutdown, 0, sock, how);
|
|
}
|
|
|
|
/**
|
|
* security_sock_rcv_skb() - Check if an incoming network packet is allowed
|
|
* @sk: destination sock
|
|
* @skb: incoming packet
|
|
*
|
|
* Check permissions on incoming network packets. This hook is distinct from
|
|
* Netfilter's IP input hooks since it is the first time that the incoming
|
|
* sk_buff @skb has been associated with a particular socket, @sk. Must not
|
|
* sleep inside this hook because some callers hold spinlocks.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
return call_int_hook(socket_sock_rcv_skb, 0, sk, skb);
|
|
}
|
|
EXPORT_SYMBOL(security_sock_rcv_skb);
|
|
|
|
/**
|
|
* security_socket_getpeersec_stream() - Get the remote peer label
|
|
* @sock: socket
|
|
* @optval: destination buffer
|
|
* @optlen: size of peer label copied into the buffer
|
|
* @len: maximum size of the destination buffer
|
|
*
|
|
* This hook allows the security module to provide peer socket security state
|
|
* for unix or connected tcp sockets to userspace via getsockopt SO_GETPEERSEC.
|
|
* For tcp sockets this can be meaningful if the socket is associated with an
|
|
* ipsec SA.
|
|
*
|
|
* Return: Returns 0 if all is well, otherwise, typical getsockopt return
|
|
* values.
|
|
*/
|
|
int security_socket_getpeersec_stream(struct socket *sock, sockptr_t optval,
|
|
sockptr_t optlen, unsigned int len)
|
|
{
|
|
return call_int_hook(socket_getpeersec_stream, -ENOPROTOOPT, sock,
|
|
optval, optlen, len);
|
|
}
|
|
|
|
/**
|
|
* security_socket_getpeersec_dgram() - Get the remote peer label
|
|
* @sock: socket
|
|
* @skb: datagram packet
|
|
* @secid: remote peer label secid
|
|
*
|
|
* This hook allows the security module to provide peer socket security state
|
|
* for udp sockets on a per-packet basis to userspace via getsockopt
|
|
* SO_GETPEERSEC. The application must first have indicated the IP_PASSSEC
|
|
* option via getsockopt. It can then retrieve the security state returned by
|
|
* this hook for a packet via the SCM_SECURITY ancillary message type.
|
|
*
|
|
* Return: Returns 0 on success, error on failure.
|
|
*/
|
|
int security_socket_getpeersec_dgram(struct socket *sock,
|
|
struct sk_buff *skb, u32 *secid)
|
|
{
|
|
return call_int_hook(socket_getpeersec_dgram, -ENOPROTOOPT, sock,
|
|
skb, secid);
|
|
}
|
|
EXPORT_SYMBOL(security_socket_getpeersec_dgram);
|
|
|
|
/**
|
|
* security_sk_alloc() - Allocate and initialize a sock's LSM blob
|
|
* @sk: sock
|
|
* @family: protocol family
|
|
* @priority: gfp flags
|
|
*
|
|
* Allocate and attach a security structure to the sk->sk_security field, which
|
|
* is used to copy security attributes between local stream sockets.
|
|
*
|
|
* Return: Returns 0 on success, error on failure.
|
|
*/
|
|
int security_sk_alloc(struct sock *sk, int family, gfp_t priority)
|
|
{
|
|
return call_int_hook(sk_alloc_security, 0, sk, family, priority);
|
|
}
|
|
|
|
/**
|
|
* security_sk_free() - Free the sock's LSM blob
|
|
* @sk: sock
|
|
*
|
|
* Deallocate security structure.
|
|
*/
|
|
void security_sk_free(struct sock *sk)
|
|
{
|
|
call_void_hook(sk_free_security, sk);
|
|
}
|
|
|
|
/**
|
|
* security_sk_clone() - Clone a sock's LSM state
|
|
* @sk: original sock
|
|
* @newsk: target sock
|
|
*
|
|
* Clone/copy security structure.
|
|
*/
|
|
void security_sk_clone(const struct sock *sk, struct sock *newsk)
|
|
{
|
|
call_void_hook(sk_clone_security, sk, newsk);
|
|
}
|
|
EXPORT_SYMBOL(security_sk_clone);
|
|
|
|
void security_sk_classify_flow(const struct sock *sk, struct flowi_common *flic)
|
|
{
|
|
call_void_hook(sk_getsecid, sk, &flic->flowic_secid);
|
|
}
|
|
EXPORT_SYMBOL(security_sk_classify_flow);
|
|
|
|
/**
|
|
* security_req_classify_flow() - Set a flow's secid based on request_sock
|
|
* @req: request_sock
|
|
* @flic: target flow
|
|
*
|
|
* Sets @flic's secid to @req's secid.
|
|
*/
|
|
void security_req_classify_flow(const struct request_sock *req,
|
|
struct flowi_common *flic)
|
|
{
|
|
call_void_hook(req_classify_flow, req, flic);
|
|
}
|
|
EXPORT_SYMBOL(security_req_classify_flow);
|
|
|
|
/**
|
|
* security_sock_graft() - Reconcile LSM state when grafting a sock on a socket
|
|
* @sk: sock being grafted
|
|
* @parent: target parent socket
|
|
*
|
|
* Sets @parent's inode secid to @sk's secid and update @sk with any necessary
|
|
* LSM state from @parent.
|
|
*/
|
|
void security_sock_graft(struct sock *sk, struct socket *parent)
|
|
{
|
|
call_void_hook(sock_graft, sk, parent);
|
|
}
|
|
EXPORT_SYMBOL(security_sock_graft);
|
|
|
|
/**
|
|
* security_inet_conn_request() - Set request_sock state using incoming connect
|
|
* @sk: parent listening sock
|
|
* @skb: incoming connection
|
|
* @req: new request_sock
|
|
*
|
|
* Initialize the @req LSM state based on @sk and the incoming connect in @skb.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_inet_conn_request(const struct sock *sk,
|
|
struct sk_buff *skb, struct request_sock *req)
|
|
{
|
|
return call_int_hook(inet_conn_request, 0, sk, skb, req);
|
|
}
|
|
EXPORT_SYMBOL(security_inet_conn_request);
|
|
|
|
/**
|
|
* security_inet_csk_clone() - Set new sock LSM state based on request_sock
|
|
* @newsk: new sock
|
|
* @req: connection request_sock
|
|
*
|
|
* Set that LSM state of @sock using the LSM state from @req.
|
|
*/
|
|
void security_inet_csk_clone(struct sock *newsk,
|
|
const struct request_sock *req)
|
|
{
|
|
call_void_hook(inet_csk_clone, newsk, req);
|
|
}
|
|
|
|
/**
|
|
* security_inet_conn_established() - Update sock's LSM state with connection
|
|
* @sk: sock
|
|
* @skb: connection packet
|
|
*
|
|
* Update @sock's LSM state to represent a new connection from @skb.
|
|
*/
|
|
void security_inet_conn_established(struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
call_void_hook(inet_conn_established, sk, skb);
|
|
}
|
|
EXPORT_SYMBOL(security_inet_conn_established);
|
|
|
|
/**
|
|
* security_secmark_relabel_packet() - Check if setting a secmark is allowed
|
|
* @secid: new secmark value
|
|
*
|
|
* Check if the process should be allowed to relabel packets to @secid.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_secmark_relabel_packet(u32 secid)
|
|
{
|
|
return call_int_hook(secmark_relabel_packet, 0, secid);
|
|
}
|
|
EXPORT_SYMBOL(security_secmark_relabel_packet);
|
|
|
|
/**
|
|
* security_secmark_refcount_inc() - Increment the secmark labeling rule count
|
|
*
|
|
* Tells the LSM to increment the number of secmark labeling rules loaded.
|
|
*/
|
|
void security_secmark_refcount_inc(void)
|
|
{
|
|
call_void_hook(secmark_refcount_inc);
|
|
}
|
|
EXPORT_SYMBOL(security_secmark_refcount_inc);
|
|
|
|
/**
|
|
* security_secmark_refcount_dec() - Decrement the secmark labeling rule count
|
|
*
|
|
* Tells the LSM to decrement the number of secmark labeling rules loaded.
|
|
*/
|
|
void security_secmark_refcount_dec(void)
|
|
{
|
|
call_void_hook(secmark_refcount_dec);
|
|
}
|
|
EXPORT_SYMBOL(security_secmark_refcount_dec);
|
|
|
|
/**
|
|
* security_tun_dev_alloc_security() - Allocate a LSM blob for a TUN device
|
|
* @security: pointer to the LSM blob
|
|
*
|
|
* This hook allows a module to allocate a security structure for a TUN device,
|
|
* returning the pointer in @security.
|
|
*
|
|
* Return: Returns a zero on success, negative values on failure.
|
|
*/
|
|
int security_tun_dev_alloc_security(void **security)
|
|
{
|
|
return call_int_hook(tun_dev_alloc_security, 0, security);
|
|
}
|
|
EXPORT_SYMBOL(security_tun_dev_alloc_security);
|
|
|
|
/**
|
|
* security_tun_dev_free_security() - Free a TUN device LSM blob
|
|
* @security: LSM blob
|
|
*
|
|
* This hook allows a module to free the security structure for a TUN device.
|
|
*/
|
|
void security_tun_dev_free_security(void *security)
|
|
{
|
|
call_void_hook(tun_dev_free_security, security);
|
|
}
|
|
EXPORT_SYMBOL(security_tun_dev_free_security);
|
|
|
|
/**
|
|
* security_tun_dev_create() - Check if creating a TUN device is allowed
|
|
*
|
|
* Check permissions prior to creating a new TUN device.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_tun_dev_create(void)
|
|
{
|
|
return call_int_hook(tun_dev_create, 0);
|
|
}
|
|
EXPORT_SYMBOL(security_tun_dev_create);
|
|
|
|
/**
|
|
* security_tun_dev_attach_queue() - Check if attaching a TUN queue is allowed
|
|
* @security: TUN device LSM blob
|
|
*
|
|
* Check permissions prior to attaching to a TUN device queue.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_tun_dev_attach_queue(void *security)
|
|
{
|
|
return call_int_hook(tun_dev_attach_queue, 0, security);
|
|
}
|
|
EXPORT_SYMBOL(security_tun_dev_attach_queue);
|
|
|
|
/**
|
|
* security_tun_dev_attach() - Update TUN device LSM state on attach
|
|
* @sk: associated sock
|
|
* @security: TUN device LSM blob
|
|
*
|
|
* This hook can be used by the module to update any security state associated
|
|
* with the TUN device's sock structure.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_tun_dev_attach(struct sock *sk, void *security)
|
|
{
|
|
return call_int_hook(tun_dev_attach, 0, sk, security);
|
|
}
|
|
EXPORT_SYMBOL(security_tun_dev_attach);
|
|
|
|
/**
|
|
* security_tun_dev_open() - Update TUN device LSM state on open
|
|
* @security: TUN device LSM blob
|
|
*
|
|
* This hook can be used by the module to update any security state associated
|
|
* with the TUN device's security structure.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_tun_dev_open(void *security)
|
|
{
|
|
return call_int_hook(tun_dev_open, 0, security);
|
|
}
|
|
EXPORT_SYMBOL(security_tun_dev_open);
|
|
|
|
/**
|
|
* security_sctp_assoc_request() - Update the LSM on a SCTP association req
|
|
* @asoc: SCTP association
|
|
* @skb: packet requesting the association
|
|
*
|
|
* Passes the @asoc and @chunk->skb of the association INIT packet to the LSM.
|
|
*
|
|
* Return: Returns 0 on success, error on failure.
|
|
*/
|
|
int security_sctp_assoc_request(struct sctp_association *asoc,
|
|
struct sk_buff *skb)
|
|
{
|
|
return call_int_hook(sctp_assoc_request, 0, asoc, skb);
|
|
}
|
|
EXPORT_SYMBOL(security_sctp_assoc_request);
|
|
|
|
/**
|
|
* security_sctp_bind_connect() - Validate a list of addrs for a SCTP option
|
|
* @sk: socket
|
|
* @optname: SCTP option to validate
|
|
* @address: list of IP addresses to validate
|
|
* @addrlen: length of the address list
|
|
*
|
|
* Validiate permissions required for each address associated with sock @sk.
|
|
* Depending on @optname, the addresses will be treated as either a connect or
|
|
* bind service. The @addrlen is calculated on each IPv4 and IPv6 address using
|
|
* sizeof(struct sockaddr_in) or sizeof(struct sockaddr_in6).
|
|
*
|
|
* Return: Returns 0 on success, error on failure.
|
|
*/
|
|
int security_sctp_bind_connect(struct sock *sk, int optname,
|
|
struct sockaddr *address, int addrlen)
|
|
{
|
|
return call_int_hook(sctp_bind_connect, 0, sk, optname,
|
|
address, addrlen);
|
|
}
|
|
EXPORT_SYMBOL(security_sctp_bind_connect);
|
|
|
|
/**
|
|
* security_sctp_sk_clone() - Clone a SCTP sock's LSM state
|
|
* @asoc: SCTP association
|
|
* @sk: original sock
|
|
* @newsk: target sock
|
|
*
|
|
* Called whenever a new socket is created by accept(2) (i.e. a TCP style
|
|
* socket) or when a socket is 'peeled off' e.g userspace calls
|
|
* sctp_peeloff(3).
|
|
*/
|
|
void security_sctp_sk_clone(struct sctp_association *asoc, struct sock *sk,
|
|
struct sock *newsk)
|
|
{
|
|
call_void_hook(sctp_sk_clone, asoc, sk, newsk);
|
|
}
|
|
EXPORT_SYMBOL(security_sctp_sk_clone);
|
|
|
|
/**
|
|
* security_sctp_assoc_established() - Update LSM state when assoc established
|
|
* @asoc: SCTP association
|
|
* @skb: packet establishing the association
|
|
*
|
|
* Passes the @asoc and @chunk->skb of the association COOKIE_ACK packet to the
|
|
* security module.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_sctp_assoc_established(struct sctp_association *asoc,
|
|
struct sk_buff *skb)
|
|
{
|
|
return call_int_hook(sctp_assoc_established, 0, asoc, skb);
|
|
}
|
|
EXPORT_SYMBOL(security_sctp_assoc_established);
|
|
|
|
/**
|
|
* security_mptcp_add_subflow() - Inherit the LSM label from the MPTCP socket
|
|
* @sk: the owning MPTCP socket
|
|
* @ssk: the new subflow
|
|
*
|
|
* Update the labeling for the given MPTCP subflow, to match the one of the
|
|
* owning MPTCP socket. This hook has to be called after the socket creation and
|
|
* initialization via the security_socket_create() and
|
|
* security_socket_post_create() LSM hooks.
|
|
*
|
|
* Return: Returns 0 on success or a negative error code on failure.
|
|
*/
|
|
int security_mptcp_add_subflow(struct sock *sk, struct sock *ssk)
|
|
{
|
|
return call_int_hook(mptcp_add_subflow, 0, sk, ssk);
|
|
}
|
|
|
|
#endif /* CONFIG_SECURITY_NETWORK */
|
|
|
|
#ifdef CONFIG_SECURITY_INFINIBAND
|
|
/**
|
|
* security_ib_pkey_access() - Check if access to an IB pkey is allowed
|
|
* @sec: LSM blob
|
|
* @subnet_prefix: subnet prefix of the port
|
|
* @pkey: IB pkey
|
|
*
|
|
* Check permission to access a pkey when modifying a QP.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_ib_pkey_access(void *sec, u64 subnet_prefix, u16 pkey)
|
|
{
|
|
return call_int_hook(ib_pkey_access, 0, sec, subnet_prefix, pkey);
|
|
}
|
|
EXPORT_SYMBOL(security_ib_pkey_access);
|
|
|
|
/**
|
|
* security_ib_endport_manage_subnet() - Check if SMPs traffic is allowed
|
|
* @sec: LSM blob
|
|
* @dev_name: IB device name
|
|
* @port_num: port number
|
|
*
|
|
* Check permissions to send and receive SMPs on a end port.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_ib_endport_manage_subnet(void *sec,
|
|
const char *dev_name, u8 port_num)
|
|
{
|
|
return call_int_hook(ib_endport_manage_subnet, 0, sec,
|
|
dev_name, port_num);
|
|
}
|
|
EXPORT_SYMBOL(security_ib_endport_manage_subnet);
|
|
|
|
/**
|
|
* security_ib_alloc_security() - Allocate an Infiniband LSM blob
|
|
* @sec: LSM blob
|
|
*
|
|
* Allocate a security structure for Infiniband objects.
|
|
*
|
|
* Return: Returns 0 on success, non-zero on failure.
|
|
*/
|
|
int security_ib_alloc_security(void **sec)
|
|
{
|
|
return call_int_hook(ib_alloc_security, 0, sec);
|
|
}
|
|
EXPORT_SYMBOL(security_ib_alloc_security);
|
|
|
|
/**
|
|
* security_ib_free_security() - Free an Infiniband LSM blob
|
|
* @sec: LSM blob
|
|
*
|
|
* Deallocate an Infiniband security structure.
|
|
*/
|
|
void security_ib_free_security(void *sec)
|
|
{
|
|
call_void_hook(ib_free_security, sec);
|
|
}
|
|
EXPORT_SYMBOL(security_ib_free_security);
|
|
#endif /* CONFIG_SECURITY_INFINIBAND */
|
|
|
|
#ifdef CONFIG_SECURITY_NETWORK_XFRM
|
|
/**
|
|
* security_xfrm_policy_alloc() - Allocate a xfrm policy LSM blob
|
|
* @ctxp: xfrm security context being added to the SPD
|
|
* @sec_ctx: security label provided by userspace
|
|
* @gfp: gfp flags
|
|
*
|
|
* Allocate a security structure to the xp->security field; the security field
|
|
* is initialized to NULL when the xfrm_policy is allocated.
|
|
*
|
|
* Return: Return 0 if operation was successful.
|
|
*/
|
|
int security_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp,
|
|
struct xfrm_user_sec_ctx *sec_ctx,
|
|
gfp_t gfp)
|
|
{
|
|
return call_int_hook(xfrm_policy_alloc_security, 0, ctxp, sec_ctx, gfp);
|
|
}
|
|
EXPORT_SYMBOL(security_xfrm_policy_alloc);
|
|
|
|
/**
|
|
* security_xfrm_policy_clone() - Clone xfrm policy LSM state
|
|
* @old_ctx: xfrm security context
|
|
* @new_ctxp: target xfrm security context
|
|
*
|
|
* Allocate a security structure in new_ctxp that contains the information from
|
|
* the old_ctx structure.
|
|
*
|
|
* Return: Return 0 if operation was successful.
|
|
*/
|
|
int security_xfrm_policy_clone(struct xfrm_sec_ctx *old_ctx,
|
|
struct xfrm_sec_ctx **new_ctxp)
|
|
{
|
|
return call_int_hook(xfrm_policy_clone_security, 0, old_ctx, new_ctxp);
|
|
}
|
|
|
|
/**
|
|
* security_xfrm_policy_free() - Free a xfrm security context
|
|
* @ctx: xfrm security context
|
|
*
|
|
* Free LSM resources associated with @ctx.
|
|
*/
|
|
void security_xfrm_policy_free(struct xfrm_sec_ctx *ctx)
|
|
{
|
|
call_void_hook(xfrm_policy_free_security, ctx);
|
|
}
|
|
EXPORT_SYMBOL(security_xfrm_policy_free);
|
|
|
|
/**
|
|
* security_xfrm_policy_delete() - Check if deleting a xfrm policy is allowed
|
|
* @ctx: xfrm security context
|
|
*
|
|
* Authorize deletion of a SPD entry.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_xfrm_policy_delete(struct xfrm_sec_ctx *ctx)
|
|
{
|
|
return call_int_hook(xfrm_policy_delete_security, 0, ctx);
|
|
}
|
|
|
|
/**
|
|
* security_xfrm_state_alloc() - Allocate a xfrm state LSM blob
|
|
* @x: xfrm state being added to the SAD
|
|
* @sec_ctx: security label provided by userspace
|
|
*
|
|
* Allocate a security structure to the @x->security field; the security field
|
|
* is initialized to NULL when the xfrm_state is allocated. Set the context to
|
|
* correspond to @sec_ctx.
|
|
*
|
|
* Return: Return 0 if operation was successful.
|
|
*/
|
|
int security_xfrm_state_alloc(struct xfrm_state *x,
|
|
struct xfrm_user_sec_ctx *sec_ctx)
|
|
{
|
|
return call_int_hook(xfrm_state_alloc, 0, x, sec_ctx);
|
|
}
|
|
EXPORT_SYMBOL(security_xfrm_state_alloc);
|
|
|
|
/**
|
|
* security_xfrm_state_alloc_acquire() - Allocate a xfrm state LSM blob
|
|
* @x: xfrm state being added to the SAD
|
|
* @polsec: associated policy's security context
|
|
* @secid: secid from the flow
|
|
*
|
|
* Allocate a security structure to the x->security field; the security field
|
|
* is initialized to NULL when the xfrm_state is allocated. Set the context to
|
|
* correspond to secid.
|
|
*
|
|
* Return: Returns 0 if operation was successful.
|
|
*/
|
|
int security_xfrm_state_alloc_acquire(struct xfrm_state *x,
|
|
struct xfrm_sec_ctx *polsec, u32 secid)
|
|
{
|
|
return call_int_hook(xfrm_state_alloc_acquire, 0, x, polsec, secid);
|
|
}
|
|
|
|
/**
|
|
* security_xfrm_state_delete() - Check if deleting a xfrm state is allowed
|
|
* @x: xfrm state
|
|
*
|
|
* Authorize deletion of x->security.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_xfrm_state_delete(struct xfrm_state *x)
|
|
{
|
|
return call_int_hook(xfrm_state_delete_security, 0, x);
|
|
}
|
|
EXPORT_SYMBOL(security_xfrm_state_delete);
|
|
|
|
/**
|
|
* security_xfrm_state_free() - Free a xfrm state
|
|
* @x: xfrm state
|
|
*
|
|
* Deallocate x->security.
|
|
*/
|
|
void security_xfrm_state_free(struct xfrm_state *x)
|
|
{
|
|
call_void_hook(xfrm_state_free_security, x);
|
|
}
|
|
|
|
/**
|
|
* security_xfrm_policy_lookup() - Check if using a xfrm policy is allowed
|
|
* @ctx: target xfrm security context
|
|
* @fl_secid: flow secid used to authorize access
|
|
*
|
|
* Check permission when a flow selects a xfrm_policy for processing XFRMs on a
|
|
* packet. The hook is called when selecting either a per-socket policy or a
|
|
* generic xfrm policy.
|
|
*
|
|
* Return: Return 0 if permission is granted, -ESRCH otherwise, or -errno on
|
|
* other errors.
|
|
*/
|
|
int security_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx, u32 fl_secid)
|
|
{
|
|
return call_int_hook(xfrm_policy_lookup, 0, ctx, fl_secid);
|
|
}
|
|
|
|
/**
|
|
* security_xfrm_state_pol_flow_match() - Check for a xfrm match
|
|
* @x: xfrm state to match
|
|
* @xp: xfrm policy to check for a match
|
|
* @flic: flow to check for a match.
|
|
*
|
|
* Check @xp and @flic for a match with @x.
|
|
*
|
|
* Return: Returns 1 if there is a match.
|
|
*/
|
|
int security_xfrm_state_pol_flow_match(struct xfrm_state *x,
|
|
struct xfrm_policy *xp,
|
|
const struct flowi_common *flic)
|
|
{
|
|
struct security_hook_list *hp;
|
|
int rc = LSM_RET_DEFAULT(xfrm_state_pol_flow_match);
|
|
|
|
/*
|
|
* Since this function is expected to return 0 or 1, the judgment
|
|
* becomes difficult if multiple LSMs supply this call. Fortunately,
|
|
* we can use the first LSM's judgment because currently only SELinux
|
|
* supplies this call.
|
|
*
|
|
* For speed optimization, we explicitly break the loop rather than
|
|
* using the macro
|
|
*/
|
|
hlist_for_each_entry(hp, &security_hook_heads.xfrm_state_pol_flow_match,
|
|
list) {
|
|
rc = hp->hook.xfrm_state_pol_flow_match(x, xp, flic);
|
|
break;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* security_xfrm_decode_session() - Determine the xfrm secid for a packet
|
|
* @skb: xfrm packet
|
|
* @secid: secid
|
|
*
|
|
* Decode the packet in @skb and return the security label in @secid.
|
|
*
|
|
* Return: Return 0 if all xfrms used have the same secid.
|
|
*/
|
|
int security_xfrm_decode_session(struct sk_buff *skb, u32 *secid)
|
|
{
|
|
return call_int_hook(xfrm_decode_session, 0, skb, secid, 1);
|
|
}
|
|
|
|
void security_skb_classify_flow(struct sk_buff *skb, struct flowi_common *flic)
|
|
{
|
|
int rc = call_int_hook(xfrm_decode_session, 0, skb, &flic->flowic_secid,
|
|
0);
|
|
|
|
BUG_ON(rc);
|
|
}
|
|
EXPORT_SYMBOL(security_skb_classify_flow);
|
|
#endif /* CONFIG_SECURITY_NETWORK_XFRM */
|
|
|
|
#ifdef CONFIG_KEYS
|
|
/**
|
|
* security_key_alloc() - Allocate and initialize a kernel key LSM blob
|
|
* @key: key
|
|
* @cred: credentials
|
|
* @flags: allocation flags
|
|
*
|
|
* Permit allocation of a key and assign security data. Note that key does not
|
|
* have a serial number assigned at this point.
|
|
*
|
|
* Return: Return 0 if permission is granted, -ve error otherwise.
|
|
*/
|
|
int security_key_alloc(struct key *key, const struct cred *cred,
|
|
unsigned long flags)
|
|
{
|
|
return call_int_hook(key_alloc, 0, key, cred, flags);
|
|
}
|
|
|
|
/**
|
|
* security_key_free() - Free a kernel key LSM blob
|
|
* @key: key
|
|
*
|
|
* Notification of destruction; free security data.
|
|
*/
|
|
void security_key_free(struct key *key)
|
|
{
|
|
call_void_hook(key_free, key);
|
|
}
|
|
|
|
/**
|
|
* security_key_permission() - Check if a kernel key operation is allowed
|
|
* @key_ref: key reference
|
|
* @cred: credentials of actor requesting access
|
|
* @need_perm: requested permissions
|
|
*
|
|
* See whether a specific operational right is granted to a process on a key.
|
|
*
|
|
* Return: Return 0 if permission is granted, -ve error otherwise.
|
|
*/
|
|
int security_key_permission(key_ref_t key_ref, const struct cred *cred,
|
|
enum key_need_perm need_perm)
|
|
{
|
|
return call_int_hook(key_permission, 0, key_ref, cred, need_perm);
|
|
}
|
|
|
|
/**
|
|
* security_key_getsecurity() - Get the key's security label
|
|
* @key: key
|
|
* @buffer: security label buffer
|
|
*
|
|
* Get a textual representation of the security context attached to a key for
|
|
* the purposes of honouring KEYCTL_GETSECURITY. This function allocates the
|
|
* storage for the NUL-terminated string and the caller should free it.
|
|
*
|
|
* Return: Returns the length of @buffer (including terminating NUL) or -ve if
|
|
* an error occurs. May also return 0 (and a NULL buffer pointer) if
|
|
* there is no security label assigned to the key.
|
|
*/
|
|
int security_key_getsecurity(struct key *key, char **buffer)
|
|
{
|
|
*buffer = NULL;
|
|
return call_int_hook(key_getsecurity, 0, key, buffer);
|
|
}
|
|
#endif /* CONFIG_KEYS */
|
|
|
|
#ifdef CONFIG_AUDIT
|
|
/**
|
|
* security_audit_rule_init() - Allocate and init an LSM audit rule struct
|
|
* @field: audit action
|
|
* @op: rule operator
|
|
* @rulestr: rule context
|
|
* @lsmrule: receive buffer for audit rule struct
|
|
*
|
|
* Allocate and initialize an LSM audit rule structure.
|
|
*
|
|
* Return: Return 0 if @lsmrule has been successfully set, -EINVAL in case of
|
|
* an invalid rule.
|
|
*/
|
|
int security_audit_rule_init(u32 field, u32 op, char *rulestr, void **lsmrule)
|
|
{
|
|
return call_int_hook(audit_rule_init, 0, field, op, rulestr, lsmrule);
|
|
}
|
|
|
|
/**
|
|
* security_audit_rule_known() - Check if an audit rule contains LSM fields
|
|
* @krule: audit rule
|
|
*
|
|
* Specifies whether given @krule contains any fields related to the current
|
|
* LSM.
|
|
*
|
|
* Return: Returns 1 in case of relation found, 0 otherwise.
|
|
*/
|
|
int security_audit_rule_known(struct audit_krule *krule)
|
|
{
|
|
return call_int_hook(audit_rule_known, 0, krule);
|
|
}
|
|
|
|
/**
|
|
* security_audit_rule_free() - Free an LSM audit rule struct
|
|
* @lsmrule: audit rule struct
|
|
*
|
|
* Deallocate the LSM audit rule structure previously allocated by
|
|
* audit_rule_init().
|
|
*/
|
|
void security_audit_rule_free(void *lsmrule)
|
|
{
|
|
call_void_hook(audit_rule_free, lsmrule);
|
|
}
|
|
|
|
/**
|
|
* security_audit_rule_match() - Check if a label matches an audit rule
|
|
* @secid: security label
|
|
* @field: LSM audit field
|
|
* @op: matching operator
|
|
* @lsmrule: audit rule
|
|
*
|
|
* Determine if given @secid matches a rule previously approved by
|
|
* security_audit_rule_known().
|
|
*
|
|
* Return: Returns 1 if secid matches the rule, 0 if it does not, -ERRNO on
|
|
* failure.
|
|
*/
|
|
int security_audit_rule_match(u32 secid, u32 field, u32 op, void *lsmrule)
|
|
{
|
|
return call_int_hook(audit_rule_match, 0, secid, field, op, lsmrule);
|
|
}
|
|
#endif /* CONFIG_AUDIT */
|
|
|
|
#ifdef CONFIG_BPF_SYSCALL
|
|
/**
|
|
* security_bpf() - Check if the bpf syscall operation is allowed
|
|
* @cmd: command
|
|
* @attr: bpf attribute
|
|
* @size: size
|
|
*
|
|
* Do a initial check for all bpf syscalls after the attribute is copied into
|
|
* the kernel. The actual security module can implement their own rules to
|
|
* check the specific cmd they need.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_bpf(int cmd, union bpf_attr *attr, unsigned int size)
|
|
{
|
|
return call_int_hook(bpf, 0, cmd, attr, size);
|
|
}
|
|
|
|
/**
|
|
* security_bpf_map() - Check if access to a bpf map is allowed
|
|
* @map: bpf map
|
|
* @fmode: mode
|
|
*
|
|
* Do a check when the kernel generates and returns a file descriptor for eBPF
|
|
* maps.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_bpf_map(struct bpf_map *map, fmode_t fmode)
|
|
{
|
|
return call_int_hook(bpf_map, 0, map, fmode);
|
|
}
|
|
|
|
/**
|
|
* security_bpf_prog() - Check if access to a bpf program is allowed
|
|
* @prog: bpf program
|
|
*
|
|
* Do a check when the kernel generates and returns a file descriptor for eBPF
|
|
* programs.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_bpf_prog(struct bpf_prog *prog)
|
|
{
|
|
return call_int_hook(bpf_prog, 0, prog);
|
|
}
|
|
|
|
/**
|
|
* security_bpf_map_alloc() - Allocate a bpf map LSM blob
|
|
* @map: bpf map
|
|
*
|
|
* Initialize the security field inside bpf map.
|
|
*
|
|
* Return: Returns 0 on success, error on failure.
|
|
*/
|
|
int security_bpf_map_alloc(struct bpf_map *map)
|
|
{
|
|
return call_int_hook(bpf_map_alloc_security, 0, map);
|
|
}
|
|
|
|
/**
|
|
* security_bpf_prog_alloc() - Allocate a bpf program LSM blob
|
|
* @aux: bpf program aux info struct
|
|
*
|
|
* Initialize the security field inside bpf program.
|
|
*
|
|
* Return: Returns 0 on success, error on failure.
|
|
*/
|
|
int security_bpf_prog_alloc(struct bpf_prog_aux *aux)
|
|
{
|
|
return call_int_hook(bpf_prog_alloc_security, 0, aux);
|
|
}
|
|
|
|
/**
|
|
* security_bpf_map_free() - Free a bpf map's LSM blob
|
|
* @map: bpf map
|
|
*
|
|
* Clean up the security information stored inside bpf map.
|
|
*/
|
|
void security_bpf_map_free(struct bpf_map *map)
|
|
{
|
|
call_void_hook(bpf_map_free_security, map);
|
|
}
|
|
|
|
/**
|
|
* security_bpf_prog_free() - Free a bpf program's LSM blob
|
|
* @aux: bpf program aux info struct
|
|
*
|
|
* Clean up the security information stored inside bpf prog.
|
|
*/
|
|
void security_bpf_prog_free(struct bpf_prog_aux *aux)
|
|
{
|
|
call_void_hook(bpf_prog_free_security, aux);
|
|
}
|
|
#endif /* CONFIG_BPF_SYSCALL */
|
|
|
|
/**
|
|
* security_locked_down() - Check if a kernel feature is allowed
|
|
* @what: requested kernel feature
|
|
*
|
|
* Determine whether a kernel feature that potentially enables arbitrary code
|
|
* execution in kernel space should be permitted.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_locked_down(enum lockdown_reason what)
|
|
{
|
|
return call_int_hook(locked_down, 0, what);
|
|
}
|
|
EXPORT_SYMBOL(security_locked_down);
|
|
|
|
#ifdef CONFIG_PERF_EVENTS
|
|
/**
|
|
* security_perf_event_open() - Check if a perf event open is allowed
|
|
* @attr: perf event attribute
|
|
* @type: type of event
|
|
*
|
|
* Check whether the @type of perf_event_open syscall is allowed.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_perf_event_open(struct perf_event_attr *attr, int type)
|
|
{
|
|
return call_int_hook(perf_event_open, 0, attr, type);
|
|
}
|
|
|
|
/**
|
|
* security_perf_event_alloc() - Allocate a perf event LSM blob
|
|
* @event: perf event
|
|
*
|
|
* Allocate and save perf_event security info.
|
|
*
|
|
* Return: Returns 0 on success, error on failure.
|
|
*/
|
|
int security_perf_event_alloc(struct perf_event *event)
|
|
{
|
|
return call_int_hook(perf_event_alloc, 0, event);
|
|
}
|
|
|
|
/**
|
|
* security_perf_event_free() - Free a perf event LSM blob
|
|
* @event: perf event
|
|
*
|
|
* Release (free) perf_event security info.
|
|
*/
|
|
void security_perf_event_free(struct perf_event *event)
|
|
{
|
|
call_void_hook(perf_event_free, event);
|
|
}
|
|
|
|
/**
|
|
* security_perf_event_read() - Check if reading a perf event label is allowed
|
|
* @event: perf event
|
|
*
|
|
* Read perf_event security info if allowed.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_perf_event_read(struct perf_event *event)
|
|
{
|
|
return call_int_hook(perf_event_read, 0, event);
|
|
}
|
|
|
|
/**
|
|
* security_perf_event_write() - Check if writing a perf event label is allowed
|
|
* @event: perf event
|
|
*
|
|
* Write perf_event security info if allowed.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_perf_event_write(struct perf_event *event)
|
|
{
|
|
return call_int_hook(perf_event_write, 0, event);
|
|
}
|
|
#endif /* CONFIG_PERF_EVENTS */
|
|
|
|
#ifdef CONFIG_IO_URING
|
|
/**
|
|
* security_uring_override_creds() - Check if overriding creds is allowed
|
|
* @new: new credentials
|
|
*
|
|
* Check if the current task, executing an io_uring operation, is allowed to
|
|
* override it's credentials with @new.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_uring_override_creds(const struct cred *new)
|
|
{
|
|
return call_int_hook(uring_override_creds, 0, new);
|
|
}
|
|
|
|
/**
|
|
* security_uring_sqpoll() - Check if IORING_SETUP_SQPOLL is allowed
|
|
*
|
|
* Check whether the current task is allowed to spawn a io_uring polling thread
|
|
* (IORING_SETUP_SQPOLL).
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_uring_sqpoll(void)
|
|
{
|
|
return call_int_hook(uring_sqpoll, 0);
|
|
}
|
|
|
|
/**
|
|
* security_uring_cmd() - Check if a io_uring passthrough command is allowed
|
|
* @ioucmd: command
|
|
*
|
|
* Check whether the file_operations uring_cmd is allowed to run.
|
|
*
|
|
* Return: Returns 0 if permission is granted.
|
|
*/
|
|
int security_uring_cmd(struct io_uring_cmd *ioucmd)
|
|
{
|
|
return call_int_hook(uring_cmd, 0, ioucmd);
|
|
}
|
|
#endif /* CONFIG_IO_URING */
|