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![Deepa Dinamani](/assets/img/avatar_default.png)
CURRENT_TIME macro is not appropriate for filesystems as it doesn't use the right granularity for filesystem timestamps. Use current_time() instead. CURRENT_TIME is also not y2038 safe. This is also in preparation for the patch that transitions vfs timestamps to use 64 bit time and hence make them y2038 safe. As part of the effort current_time() will be extended to do range checks. Hence, it is necessary for all file system timestamps to use current_time(). Also, current_time() will be transitioned along with vfs to be y2038 safe. Note that whenever a single call to current_time() is used to change timestamps in different inodes, it is because they share the same time granularity. Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Felipe Balbi <balbi@kernel.org> Acked-by: Steven Whitehouse <swhiteho@redhat.com> Acked-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Acked-by: David Sterba <dsterba@suse.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
1933 lines
43 KiB
C
1933 lines
43 KiB
C
/* Updated: Karl MacMillan <kmacmillan@tresys.com>
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*
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* Added conditional policy language extensions
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*
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* Updated: Hewlett-Packard <paul@paul-moore.com>
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*
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* Added support for the policy capability bitmap
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*
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* Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
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* Copyright (C) 2003 - 2004 Tresys Technology, LLC
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* Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2.
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*/
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#include <linux/kernel.h>
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#include <linux/pagemap.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/fs.h>
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#include <linux/mutex.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <linux/security.h>
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#include <linux/major.h>
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#include <linux/seq_file.h>
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#include <linux/percpu.h>
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#include <linux/audit.h>
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#include <linux/uaccess.h>
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#include <linux/kobject.h>
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#include <linux/ctype.h>
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/* selinuxfs pseudo filesystem for exporting the security policy API.
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Based on the proc code and the fs/nfsd/nfsctl.c code. */
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#include "flask.h"
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#include "avc.h"
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#include "avc_ss.h"
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#include "security.h"
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#include "objsec.h"
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#include "conditional.h"
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/* Policy capability filenames */
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static char *policycap_names[] = {
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"network_peer_controls",
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"open_perms",
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"redhat1",
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"always_check_network"
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};
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unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
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static int __init checkreqprot_setup(char *str)
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{
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unsigned long checkreqprot;
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if (!kstrtoul(str, 0, &checkreqprot))
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selinux_checkreqprot = checkreqprot ? 1 : 0;
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return 1;
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}
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__setup("checkreqprot=", checkreqprot_setup);
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static DEFINE_MUTEX(sel_mutex);
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/* global data for booleans */
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static struct dentry *bool_dir;
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static int bool_num;
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static char **bool_pending_names;
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static int *bool_pending_values;
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/* global data for classes */
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static struct dentry *class_dir;
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static unsigned long last_class_ino;
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static char policy_opened;
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/* global data for policy capabilities */
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static struct dentry *policycap_dir;
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/* Check whether a task is allowed to use a security operation. */
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static int task_has_security(struct task_struct *tsk,
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u32 perms)
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{
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const struct task_security_struct *tsec;
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u32 sid = 0;
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rcu_read_lock();
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tsec = __task_cred(tsk)->security;
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if (tsec)
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sid = tsec->sid;
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rcu_read_unlock();
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if (!tsec)
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return -EACCES;
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return avc_has_perm(sid, SECINITSID_SECURITY,
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SECCLASS_SECURITY, perms, NULL);
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}
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enum sel_inos {
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SEL_ROOT_INO = 2,
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SEL_LOAD, /* load policy */
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SEL_ENFORCE, /* get or set enforcing status */
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SEL_CONTEXT, /* validate context */
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SEL_ACCESS, /* compute access decision */
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SEL_CREATE, /* compute create labeling decision */
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SEL_RELABEL, /* compute relabeling decision */
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SEL_USER, /* compute reachable user contexts */
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SEL_POLICYVERS, /* return policy version for this kernel */
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SEL_COMMIT_BOOLS, /* commit new boolean values */
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SEL_MLS, /* return if MLS policy is enabled */
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SEL_DISABLE, /* disable SELinux until next reboot */
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SEL_MEMBER, /* compute polyinstantiation membership decision */
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SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
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SEL_COMPAT_NET, /* whether to use old compat network packet controls */
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SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
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SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
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SEL_STATUS, /* export current status using mmap() */
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SEL_POLICY, /* allow userspace to read the in kernel policy */
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SEL_VALIDATE_TRANS, /* compute validatetrans decision */
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SEL_INO_NEXT, /* The next inode number to use */
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};
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static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
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#define SEL_INITCON_INO_OFFSET 0x01000000
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#define SEL_BOOL_INO_OFFSET 0x02000000
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#define SEL_CLASS_INO_OFFSET 0x04000000
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#define SEL_POLICYCAP_INO_OFFSET 0x08000000
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#define SEL_INO_MASK 0x00ffffff
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#define TMPBUFLEN 12
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static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
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size_t count, loff_t *ppos)
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{
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char tmpbuf[TMPBUFLEN];
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ssize_t length;
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length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
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return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
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}
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#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
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static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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char *page = NULL;
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ssize_t length;
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int new_value;
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if (count >= PAGE_SIZE)
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return -ENOMEM;
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/* No partial writes. */
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if (*ppos != 0)
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return -EINVAL;
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page = memdup_user_nul(buf, count);
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if (IS_ERR(page))
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return PTR_ERR(page);
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length = -EINVAL;
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if (sscanf(page, "%d", &new_value) != 1)
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goto out;
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if (new_value != selinux_enforcing) {
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length = task_has_security(current, SECURITY__SETENFORCE);
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if (length)
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goto out;
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audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
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"enforcing=%d old_enforcing=%d auid=%u ses=%u",
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new_value, selinux_enforcing,
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from_kuid(&init_user_ns, audit_get_loginuid(current)),
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audit_get_sessionid(current));
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selinux_enforcing = new_value;
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if (selinux_enforcing)
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avc_ss_reset(0);
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selnl_notify_setenforce(selinux_enforcing);
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selinux_status_update_setenforce(selinux_enforcing);
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}
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length = count;
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out:
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kfree(page);
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return length;
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}
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#else
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#define sel_write_enforce NULL
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#endif
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static const struct file_operations sel_enforce_ops = {
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.read = sel_read_enforce,
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.write = sel_write_enforce,
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.llseek = generic_file_llseek,
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};
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static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
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size_t count, loff_t *ppos)
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{
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char tmpbuf[TMPBUFLEN];
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ssize_t length;
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ino_t ino = file_inode(filp)->i_ino;
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int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
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security_get_reject_unknown() : !security_get_allow_unknown();
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length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
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return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
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}
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static const struct file_operations sel_handle_unknown_ops = {
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.read = sel_read_handle_unknown,
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.llseek = generic_file_llseek,
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};
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static int sel_open_handle_status(struct inode *inode, struct file *filp)
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{
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struct page *status = selinux_kernel_status_page();
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if (!status)
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return -ENOMEM;
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filp->private_data = status;
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return 0;
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}
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static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
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size_t count, loff_t *ppos)
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{
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struct page *status = filp->private_data;
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BUG_ON(!status);
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return simple_read_from_buffer(buf, count, ppos,
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page_address(status),
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sizeof(struct selinux_kernel_status));
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}
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static int sel_mmap_handle_status(struct file *filp,
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struct vm_area_struct *vma)
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{
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struct page *status = filp->private_data;
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unsigned long size = vma->vm_end - vma->vm_start;
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BUG_ON(!status);
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/* only allows one page from the head */
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if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
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return -EIO;
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/* disallow writable mapping */
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if (vma->vm_flags & VM_WRITE)
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return -EPERM;
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/* disallow mprotect() turns it into writable */
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vma->vm_flags &= ~VM_MAYWRITE;
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return remap_pfn_range(vma, vma->vm_start,
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page_to_pfn(status),
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size, vma->vm_page_prot);
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}
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static const struct file_operations sel_handle_status_ops = {
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.open = sel_open_handle_status,
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.read = sel_read_handle_status,
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.mmap = sel_mmap_handle_status,
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.llseek = generic_file_llseek,
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};
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#ifdef CONFIG_SECURITY_SELINUX_DISABLE
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static ssize_t sel_write_disable(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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char *page;
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ssize_t length;
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int new_value;
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if (count >= PAGE_SIZE)
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return -ENOMEM;
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/* No partial writes. */
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if (*ppos != 0)
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return -EINVAL;
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page = memdup_user_nul(buf, count);
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if (IS_ERR(page))
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return PTR_ERR(page);
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length = -EINVAL;
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if (sscanf(page, "%d", &new_value) != 1)
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goto out;
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if (new_value) {
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length = selinux_disable();
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if (length)
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goto out;
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audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
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"selinux=0 auid=%u ses=%u",
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from_kuid(&init_user_ns, audit_get_loginuid(current)),
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audit_get_sessionid(current));
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}
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length = count;
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out:
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kfree(page);
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return length;
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}
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#else
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#define sel_write_disable NULL
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#endif
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static const struct file_operations sel_disable_ops = {
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.write = sel_write_disable,
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.llseek = generic_file_llseek,
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};
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static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
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size_t count, loff_t *ppos)
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{
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char tmpbuf[TMPBUFLEN];
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ssize_t length;
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length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
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return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
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}
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static const struct file_operations sel_policyvers_ops = {
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.read = sel_read_policyvers,
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.llseek = generic_file_llseek,
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};
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/* declaration for sel_write_load */
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static int sel_make_bools(void);
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static int sel_make_classes(void);
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static int sel_make_policycap(void);
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/* declaration for sel_make_class_dirs */
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static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
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unsigned long *ino);
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static ssize_t sel_read_mls(struct file *filp, char __user *buf,
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size_t count, loff_t *ppos)
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{
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char tmpbuf[TMPBUFLEN];
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ssize_t length;
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length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
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security_mls_enabled());
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return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
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}
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static const struct file_operations sel_mls_ops = {
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.read = sel_read_mls,
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.llseek = generic_file_llseek,
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};
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struct policy_load_memory {
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size_t len;
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void *data;
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};
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static int sel_open_policy(struct inode *inode, struct file *filp)
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{
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struct policy_load_memory *plm = NULL;
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int rc;
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BUG_ON(filp->private_data);
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mutex_lock(&sel_mutex);
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rc = task_has_security(current, SECURITY__READ_POLICY);
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if (rc)
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goto err;
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rc = -EBUSY;
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if (policy_opened)
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goto err;
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rc = -ENOMEM;
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plm = kzalloc(sizeof(*plm), GFP_KERNEL);
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if (!plm)
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goto err;
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if (i_size_read(inode) != security_policydb_len()) {
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inode_lock(inode);
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i_size_write(inode, security_policydb_len());
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inode_unlock(inode);
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}
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rc = security_read_policy(&plm->data, &plm->len);
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if (rc)
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goto err;
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policy_opened = 1;
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filp->private_data = plm;
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mutex_unlock(&sel_mutex);
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return 0;
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err:
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mutex_unlock(&sel_mutex);
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if (plm)
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vfree(plm->data);
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kfree(plm);
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return rc;
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}
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static int sel_release_policy(struct inode *inode, struct file *filp)
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{
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struct policy_load_memory *plm = filp->private_data;
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BUG_ON(!plm);
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policy_opened = 0;
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vfree(plm->data);
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kfree(plm);
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return 0;
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}
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static ssize_t sel_read_policy(struct file *filp, char __user *buf,
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size_t count, loff_t *ppos)
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{
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struct policy_load_memory *plm = filp->private_data;
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int ret;
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mutex_lock(&sel_mutex);
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ret = task_has_security(current, SECURITY__READ_POLICY);
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if (ret)
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goto out;
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ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
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out:
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mutex_unlock(&sel_mutex);
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return ret;
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}
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static int sel_mmap_policy_fault(struct vm_area_struct *vma,
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struct vm_fault *vmf)
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{
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struct policy_load_memory *plm = vma->vm_file->private_data;
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unsigned long offset;
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struct page *page;
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if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
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return VM_FAULT_SIGBUS;
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offset = vmf->pgoff << PAGE_SHIFT;
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if (offset >= roundup(plm->len, PAGE_SIZE))
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return VM_FAULT_SIGBUS;
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page = vmalloc_to_page(plm->data + offset);
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get_page(page);
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vmf->page = page;
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return 0;
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}
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static const struct vm_operations_struct sel_mmap_policy_ops = {
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.fault = sel_mmap_policy_fault,
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.page_mkwrite = sel_mmap_policy_fault,
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};
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static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
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{
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if (vma->vm_flags & VM_SHARED) {
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/* do not allow mprotect to make mapping writable */
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vma->vm_flags &= ~VM_MAYWRITE;
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if (vma->vm_flags & VM_WRITE)
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return -EACCES;
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}
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vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
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vma->vm_ops = &sel_mmap_policy_ops;
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return 0;
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}
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static const struct file_operations sel_policy_ops = {
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.open = sel_open_policy,
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.read = sel_read_policy,
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.mmap = sel_mmap_policy,
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.release = sel_release_policy,
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.llseek = generic_file_llseek,
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};
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static ssize_t sel_write_load(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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ssize_t length;
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void *data = NULL;
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mutex_lock(&sel_mutex);
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length = task_has_security(current, SECURITY__LOAD_POLICY);
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if (length)
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goto out;
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/* No partial writes. */
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length = -EINVAL;
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if (*ppos != 0)
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goto out;
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length = -EFBIG;
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if (count > 64 * 1024 * 1024)
|
|
goto out;
|
|
|
|
length = -ENOMEM;
|
|
data = vmalloc(count);
|
|
if (!data)
|
|
goto out;
|
|
|
|
length = -EFAULT;
|
|
if (copy_from_user(data, buf, count) != 0)
|
|
goto out;
|
|
|
|
length = security_load_policy(data, count);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = sel_make_bools();
|
|
if (length)
|
|
goto out1;
|
|
|
|
length = sel_make_classes();
|
|
if (length)
|
|
goto out1;
|
|
|
|
length = sel_make_policycap();
|
|
if (length)
|
|
goto out1;
|
|
|
|
length = count;
|
|
|
|
out1:
|
|
audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
|
|
"policy loaded auid=%u ses=%u",
|
|
from_kuid(&init_user_ns, audit_get_loginuid(current)),
|
|
audit_get_sessionid(current));
|
|
out:
|
|
mutex_unlock(&sel_mutex);
|
|
vfree(data);
|
|
return length;
|
|
}
|
|
|
|
static const struct file_operations sel_load_ops = {
|
|
.write = sel_write_load,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
|
|
{
|
|
char *canon = NULL;
|
|
u32 sid, len;
|
|
ssize_t length;
|
|
|
|
length = task_has_security(current, SECURITY__CHECK_CONTEXT);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = security_context_to_sid(buf, size, &sid, GFP_KERNEL);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = security_sid_to_context(sid, &canon, &len);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = -ERANGE;
|
|
if (len > SIMPLE_TRANSACTION_LIMIT) {
|
|
printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
|
|
"payload max\n", __func__, len);
|
|
goto out;
|
|
}
|
|
|
|
memcpy(buf, canon, len);
|
|
length = len;
|
|
out:
|
|
kfree(canon);
|
|
return length;
|
|
}
|
|
|
|
static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char tmpbuf[TMPBUFLEN];
|
|
ssize_t length;
|
|
|
|
length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
|
|
return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
|
|
}
|
|
|
|
static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char *page;
|
|
ssize_t length;
|
|
unsigned int new_value;
|
|
|
|
length = task_has_security(current, SECURITY__SETCHECKREQPROT);
|
|
if (length)
|
|
return length;
|
|
|
|
if (count >= PAGE_SIZE)
|
|
return -ENOMEM;
|
|
|
|
/* No partial writes. */
|
|
if (*ppos != 0)
|
|
return -EINVAL;
|
|
|
|
page = memdup_user_nul(buf, count);
|
|
if (IS_ERR(page))
|
|
return PTR_ERR(page);
|
|
|
|
length = -EINVAL;
|
|
if (sscanf(page, "%u", &new_value) != 1)
|
|
goto out;
|
|
|
|
selinux_checkreqprot = new_value ? 1 : 0;
|
|
length = count;
|
|
out:
|
|
kfree(page);
|
|
return length;
|
|
}
|
|
static const struct file_operations sel_checkreqprot_ops = {
|
|
.read = sel_read_checkreqprot,
|
|
.write = sel_write_checkreqprot,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static ssize_t sel_write_validatetrans(struct file *file,
|
|
const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char *oldcon = NULL, *newcon = NULL, *taskcon = NULL;
|
|
char *req = NULL;
|
|
u32 osid, nsid, tsid;
|
|
u16 tclass;
|
|
int rc;
|
|
|
|
rc = task_has_security(current, SECURITY__VALIDATE_TRANS);
|
|
if (rc)
|
|
goto out;
|
|
|
|
rc = -ENOMEM;
|
|
if (count >= PAGE_SIZE)
|
|
goto out;
|
|
|
|
/* No partial writes. */
|
|
rc = -EINVAL;
|
|
if (*ppos != 0)
|
|
goto out;
|
|
|
|
rc = -ENOMEM;
|
|
req = kzalloc(count + 1, GFP_KERNEL);
|
|
if (!req)
|
|
goto out;
|
|
|
|
rc = -EFAULT;
|
|
if (copy_from_user(req, buf, count))
|
|
goto out;
|
|
|
|
rc = -ENOMEM;
|
|
oldcon = kzalloc(count + 1, GFP_KERNEL);
|
|
if (!oldcon)
|
|
goto out;
|
|
|
|
newcon = kzalloc(count + 1, GFP_KERNEL);
|
|
if (!newcon)
|
|
goto out;
|
|
|
|
taskcon = kzalloc(count + 1, GFP_KERNEL);
|
|
if (!taskcon)
|
|
goto out;
|
|
|
|
rc = -EINVAL;
|
|
if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4)
|
|
goto out;
|
|
|
|
rc = security_context_str_to_sid(oldcon, &osid, GFP_KERNEL);
|
|
if (rc)
|
|
goto out;
|
|
|
|
rc = security_context_str_to_sid(newcon, &nsid, GFP_KERNEL);
|
|
if (rc)
|
|
goto out;
|
|
|
|
rc = security_context_str_to_sid(taskcon, &tsid, GFP_KERNEL);
|
|
if (rc)
|
|
goto out;
|
|
|
|
rc = security_validate_transition_user(osid, nsid, tsid, tclass);
|
|
if (!rc)
|
|
rc = count;
|
|
out:
|
|
kfree(req);
|
|
kfree(oldcon);
|
|
kfree(newcon);
|
|
kfree(taskcon);
|
|
return rc;
|
|
}
|
|
|
|
static const struct file_operations sel_transition_ops = {
|
|
.write = sel_write_validatetrans,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
/*
|
|
* Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
|
|
*/
|
|
static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
|
|
static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
|
|
static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
|
|
static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
|
|
static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
|
|
|
|
static ssize_t (*write_op[])(struct file *, char *, size_t) = {
|
|
[SEL_ACCESS] = sel_write_access,
|
|
[SEL_CREATE] = sel_write_create,
|
|
[SEL_RELABEL] = sel_write_relabel,
|
|
[SEL_USER] = sel_write_user,
|
|
[SEL_MEMBER] = sel_write_member,
|
|
[SEL_CONTEXT] = sel_write_context,
|
|
};
|
|
|
|
static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
|
|
{
|
|
ino_t ino = file_inode(file)->i_ino;
|
|
char *data;
|
|
ssize_t rv;
|
|
|
|
if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
|
|
return -EINVAL;
|
|
|
|
data = simple_transaction_get(file, buf, size);
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
rv = write_op[ino](file, data, size);
|
|
if (rv > 0) {
|
|
simple_transaction_set(file, rv);
|
|
rv = size;
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
static const struct file_operations transaction_ops = {
|
|
.write = selinux_transaction_write,
|
|
.read = simple_transaction_read,
|
|
.release = simple_transaction_release,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
/*
|
|
* payload - write methods
|
|
* If the method has a response, the response should be put in buf,
|
|
* and the length returned. Otherwise return 0 or and -error.
|
|
*/
|
|
|
|
static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
|
|
{
|
|
char *scon = NULL, *tcon = NULL;
|
|
u32 ssid, tsid;
|
|
u16 tclass;
|
|
struct av_decision avd;
|
|
ssize_t length;
|
|
|
|
length = task_has_security(current, SECURITY__COMPUTE_AV);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = -ENOMEM;
|
|
scon = kzalloc(size + 1, GFP_KERNEL);
|
|
if (!scon)
|
|
goto out;
|
|
|
|
length = -ENOMEM;
|
|
tcon = kzalloc(size + 1, GFP_KERNEL);
|
|
if (!tcon)
|
|
goto out;
|
|
|
|
length = -EINVAL;
|
|
if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
|
|
goto out;
|
|
|
|
length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
|
|
if (length)
|
|
goto out;
|
|
|
|
security_compute_av_user(ssid, tsid, tclass, &avd);
|
|
|
|
length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
|
|
"%x %x %x %x %u %x",
|
|
avd.allowed, 0xffffffff,
|
|
avd.auditallow, avd.auditdeny,
|
|
avd.seqno, avd.flags);
|
|
out:
|
|
kfree(tcon);
|
|
kfree(scon);
|
|
return length;
|
|
}
|
|
|
|
static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
|
|
{
|
|
char *scon = NULL, *tcon = NULL;
|
|
char *namebuf = NULL, *objname = NULL;
|
|
u32 ssid, tsid, newsid;
|
|
u16 tclass;
|
|
ssize_t length;
|
|
char *newcon = NULL;
|
|
u32 len;
|
|
int nargs;
|
|
|
|
length = task_has_security(current, SECURITY__COMPUTE_CREATE);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = -ENOMEM;
|
|
scon = kzalloc(size + 1, GFP_KERNEL);
|
|
if (!scon)
|
|
goto out;
|
|
|
|
length = -ENOMEM;
|
|
tcon = kzalloc(size + 1, GFP_KERNEL);
|
|
if (!tcon)
|
|
goto out;
|
|
|
|
length = -ENOMEM;
|
|
namebuf = kzalloc(size + 1, GFP_KERNEL);
|
|
if (!namebuf)
|
|
goto out;
|
|
|
|
length = -EINVAL;
|
|
nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
|
|
if (nargs < 3 || nargs > 4)
|
|
goto out;
|
|
if (nargs == 4) {
|
|
/*
|
|
* If and when the name of new object to be queried contains
|
|
* either whitespace or multibyte characters, they shall be
|
|
* encoded based on the percentage-encoding rule.
|
|
* If not encoded, the sscanf logic picks up only left-half
|
|
* of the supplied name; splitted by a whitespace unexpectedly.
|
|
*/
|
|
char *r, *w;
|
|
int c1, c2;
|
|
|
|
r = w = namebuf;
|
|
do {
|
|
c1 = *r++;
|
|
if (c1 == '+')
|
|
c1 = ' ';
|
|
else if (c1 == '%') {
|
|
c1 = hex_to_bin(*r++);
|
|
if (c1 < 0)
|
|
goto out;
|
|
c2 = hex_to_bin(*r++);
|
|
if (c2 < 0)
|
|
goto out;
|
|
c1 = (c1 << 4) | c2;
|
|
}
|
|
*w++ = c1;
|
|
} while (c1 != '\0');
|
|
|
|
objname = namebuf;
|
|
}
|
|
|
|
length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = security_transition_sid_user(ssid, tsid, tclass,
|
|
objname, &newsid);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = security_sid_to_context(newsid, &newcon, &len);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = -ERANGE;
|
|
if (len > SIMPLE_TRANSACTION_LIMIT) {
|
|
printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
|
|
"payload max\n", __func__, len);
|
|
goto out;
|
|
}
|
|
|
|
memcpy(buf, newcon, len);
|
|
length = len;
|
|
out:
|
|
kfree(newcon);
|
|
kfree(namebuf);
|
|
kfree(tcon);
|
|
kfree(scon);
|
|
return length;
|
|
}
|
|
|
|
static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
|
|
{
|
|
char *scon = NULL, *tcon = NULL;
|
|
u32 ssid, tsid, newsid;
|
|
u16 tclass;
|
|
ssize_t length;
|
|
char *newcon = NULL;
|
|
u32 len;
|
|
|
|
length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = -ENOMEM;
|
|
scon = kzalloc(size + 1, GFP_KERNEL);
|
|
if (!scon)
|
|
goto out;
|
|
|
|
length = -ENOMEM;
|
|
tcon = kzalloc(size + 1, GFP_KERNEL);
|
|
if (!tcon)
|
|
goto out;
|
|
|
|
length = -EINVAL;
|
|
if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
|
|
goto out;
|
|
|
|
length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = security_change_sid(ssid, tsid, tclass, &newsid);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = security_sid_to_context(newsid, &newcon, &len);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = -ERANGE;
|
|
if (len > SIMPLE_TRANSACTION_LIMIT)
|
|
goto out;
|
|
|
|
memcpy(buf, newcon, len);
|
|
length = len;
|
|
out:
|
|
kfree(newcon);
|
|
kfree(tcon);
|
|
kfree(scon);
|
|
return length;
|
|
}
|
|
|
|
static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
|
|
{
|
|
char *con = NULL, *user = NULL, *ptr;
|
|
u32 sid, *sids = NULL;
|
|
ssize_t length;
|
|
char *newcon;
|
|
int i, rc;
|
|
u32 len, nsids;
|
|
|
|
length = task_has_security(current, SECURITY__COMPUTE_USER);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = -ENOMEM;
|
|
con = kzalloc(size + 1, GFP_KERNEL);
|
|
if (!con)
|
|
goto out;
|
|
|
|
length = -ENOMEM;
|
|
user = kzalloc(size + 1, GFP_KERNEL);
|
|
if (!user)
|
|
goto out;
|
|
|
|
length = -EINVAL;
|
|
if (sscanf(buf, "%s %s", con, user) != 2)
|
|
goto out;
|
|
|
|
length = security_context_str_to_sid(con, &sid, GFP_KERNEL);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = security_get_user_sids(sid, user, &sids, &nsids);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = sprintf(buf, "%u", nsids) + 1;
|
|
ptr = buf + length;
|
|
for (i = 0; i < nsids; i++) {
|
|
rc = security_sid_to_context(sids[i], &newcon, &len);
|
|
if (rc) {
|
|
length = rc;
|
|
goto out;
|
|
}
|
|
if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
|
|
kfree(newcon);
|
|
length = -ERANGE;
|
|
goto out;
|
|
}
|
|
memcpy(ptr, newcon, len);
|
|
kfree(newcon);
|
|
ptr += len;
|
|
length += len;
|
|
}
|
|
out:
|
|
kfree(sids);
|
|
kfree(user);
|
|
kfree(con);
|
|
return length;
|
|
}
|
|
|
|
static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
|
|
{
|
|
char *scon = NULL, *tcon = NULL;
|
|
u32 ssid, tsid, newsid;
|
|
u16 tclass;
|
|
ssize_t length;
|
|
char *newcon = NULL;
|
|
u32 len;
|
|
|
|
length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = -ENOMEM;
|
|
scon = kzalloc(size + 1, GFP_KERNEL);
|
|
if (!scon)
|
|
goto out;
|
|
|
|
length = -ENOMEM;
|
|
tcon = kzalloc(size + 1, GFP_KERNEL);
|
|
if (!tcon)
|
|
goto out;
|
|
|
|
length = -EINVAL;
|
|
if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
|
|
goto out;
|
|
|
|
length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = security_member_sid(ssid, tsid, tclass, &newsid);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = security_sid_to_context(newsid, &newcon, &len);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = -ERANGE;
|
|
if (len > SIMPLE_TRANSACTION_LIMIT) {
|
|
printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
|
|
"payload max\n", __func__, len);
|
|
goto out;
|
|
}
|
|
|
|
memcpy(buf, newcon, len);
|
|
length = len;
|
|
out:
|
|
kfree(newcon);
|
|
kfree(tcon);
|
|
kfree(scon);
|
|
return length;
|
|
}
|
|
|
|
static struct inode *sel_make_inode(struct super_block *sb, int mode)
|
|
{
|
|
struct inode *ret = new_inode(sb);
|
|
|
|
if (ret) {
|
|
ret->i_mode = mode;
|
|
ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t sel_read_bool(struct file *filep, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char *page = NULL;
|
|
ssize_t length;
|
|
ssize_t ret;
|
|
int cur_enforcing;
|
|
unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
|
|
const char *name = filep->f_path.dentry->d_name.name;
|
|
|
|
mutex_lock(&sel_mutex);
|
|
|
|
ret = -EINVAL;
|
|
if (index >= bool_num || strcmp(name, bool_pending_names[index]))
|
|
goto out;
|
|
|
|
ret = -ENOMEM;
|
|
page = (char *)get_zeroed_page(GFP_KERNEL);
|
|
if (!page)
|
|
goto out;
|
|
|
|
cur_enforcing = security_get_bool_value(index);
|
|
if (cur_enforcing < 0) {
|
|
ret = cur_enforcing;
|
|
goto out;
|
|
}
|
|
length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
|
|
bool_pending_values[index]);
|
|
ret = simple_read_from_buffer(buf, count, ppos, page, length);
|
|
out:
|
|
mutex_unlock(&sel_mutex);
|
|
free_page((unsigned long)page);
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char *page = NULL;
|
|
ssize_t length;
|
|
int new_value;
|
|
unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
|
|
const char *name = filep->f_path.dentry->d_name.name;
|
|
|
|
mutex_lock(&sel_mutex);
|
|
|
|
length = task_has_security(current, SECURITY__SETBOOL);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = -EINVAL;
|
|
if (index >= bool_num || strcmp(name, bool_pending_names[index]))
|
|
goto out;
|
|
|
|
length = -ENOMEM;
|
|
if (count >= PAGE_SIZE)
|
|
goto out;
|
|
|
|
/* No partial writes. */
|
|
length = -EINVAL;
|
|
if (*ppos != 0)
|
|
goto out;
|
|
|
|
page = memdup_user_nul(buf, count);
|
|
if (IS_ERR(page)) {
|
|
length = PTR_ERR(page);
|
|
page = NULL;
|
|
goto out;
|
|
}
|
|
|
|
length = -EINVAL;
|
|
if (sscanf(page, "%d", &new_value) != 1)
|
|
goto out;
|
|
|
|
if (new_value)
|
|
new_value = 1;
|
|
|
|
bool_pending_values[index] = new_value;
|
|
length = count;
|
|
|
|
out:
|
|
mutex_unlock(&sel_mutex);
|
|
kfree(page);
|
|
return length;
|
|
}
|
|
|
|
static const struct file_operations sel_bool_ops = {
|
|
.read = sel_read_bool,
|
|
.write = sel_write_bool,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static ssize_t sel_commit_bools_write(struct file *filep,
|
|
const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char *page = NULL;
|
|
ssize_t length;
|
|
int new_value;
|
|
|
|
mutex_lock(&sel_mutex);
|
|
|
|
length = task_has_security(current, SECURITY__SETBOOL);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = -ENOMEM;
|
|
if (count >= PAGE_SIZE)
|
|
goto out;
|
|
|
|
/* No partial writes. */
|
|
length = -EINVAL;
|
|
if (*ppos != 0)
|
|
goto out;
|
|
|
|
page = memdup_user_nul(buf, count);
|
|
if (IS_ERR(page)) {
|
|
length = PTR_ERR(page);
|
|
page = NULL;
|
|
goto out;
|
|
}
|
|
|
|
length = -EINVAL;
|
|
if (sscanf(page, "%d", &new_value) != 1)
|
|
goto out;
|
|
|
|
length = 0;
|
|
if (new_value && bool_pending_values)
|
|
length = security_set_bools(bool_num, bool_pending_values);
|
|
|
|
if (!length)
|
|
length = count;
|
|
|
|
out:
|
|
mutex_unlock(&sel_mutex);
|
|
kfree(page);
|
|
return length;
|
|
}
|
|
|
|
static const struct file_operations sel_commit_bools_ops = {
|
|
.write = sel_commit_bools_write,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static void sel_remove_entries(struct dentry *de)
|
|
{
|
|
d_genocide(de);
|
|
shrink_dcache_parent(de);
|
|
}
|
|
|
|
#define BOOL_DIR_NAME "booleans"
|
|
|
|
static int sel_make_bools(void)
|
|
{
|
|
int i, ret;
|
|
ssize_t len;
|
|
struct dentry *dentry = NULL;
|
|
struct dentry *dir = bool_dir;
|
|
struct inode *inode = NULL;
|
|
struct inode_security_struct *isec;
|
|
char **names = NULL, *page;
|
|
int num;
|
|
int *values = NULL;
|
|
u32 sid;
|
|
|
|
/* remove any existing files */
|
|
for (i = 0; i < bool_num; i++)
|
|
kfree(bool_pending_names[i]);
|
|
kfree(bool_pending_names);
|
|
kfree(bool_pending_values);
|
|
bool_num = 0;
|
|
bool_pending_names = NULL;
|
|
bool_pending_values = NULL;
|
|
|
|
sel_remove_entries(dir);
|
|
|
|
ret = -ENOMEM;
|
|
page = (char *)get_zeroed_page(GFP_KERNEL);
|
|
if (!page)
|
|
goto out;
|
|
|
|
ret = security_get_bools(&num, &names, &values);
|
|
if (ret)
|
|
goto out;
|
|
|
|
for (i = 0; i < num; i++) {
|
|
ret = -ENOMEM;
|
|
dentry = d_alloc_name(dir, names[i]);
|
|
if (!dentry)
|
|
goto out;
|
|
|
|
ret = -ENOMEM;
|
|
inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
|
|
if (!inode)
|
|
goto out;
|
|
|
|
ret = -ENAMETOOLONG;
|
|
len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
|
|
if (len >= PAGE_SIZE)
|
|
goto out;
|
|
|
|
isec = (struct inode_security_struct *)inode->i_security;
|
|
ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
|
|
if (ret)
|
|
goto out;
|
|
|
|
isec->sid = sid;
|
|
isec->initialized = 1;
|
|
inode->i_fop = &sel_bool_ops;
|
|
inode->i_ino = i|SEL_BOOL_INO_OFFSET;
|
|
d_add(dentry, inode);
|
|
}
|
|
bool_num = num;
|
|
bool_pending_names = names;
|
|
bool_pending_values = values;
|
|
|
|
free_page((unsigned long)page);
|
|
return 0;
|
|
out:
|
|
free_page((unsigned long)page);
|
|
|
|
if (names) {
|
|
for (i = 0; i < num; i++)
|
|
kfree(names[i]);
|
|
kfree(names);
|
|
}
|
|
kfree(values);
|
|
sel_remove_entries(dir);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#define NULL_FILE_NAME "null"
|
|
|
|
struct path selinux_null;
|
|
|
|
static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char tmpbuf[TMPBUFLEN];
|
|
ssize_t length;
|
|
|
|
length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
|
|
return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
|
|
}
|
|
|
|
static ssize_t sel_write_avc_cache_threshold(struct file *file,
|
|
const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
|
|
{
|
|
char *page;
|
|
ssize_t ret;
|
|
unsigned int new_value;
|
|
|
|
ret = task_has_security(current, SECURITY__SETSECPARAM);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (count >= PAGE_SIZE)
|
|
return -ENOMEM;
|
|
|
|
/* No partial writes. */
|
|
if (*ppos != 0)
|
|
return -EINVAL;
|
|
|
|
page = memdup_user_nul(buf, count);
|
|
if (IS_ERR(page))
|
|
return PTR_ERR(page);
|
|
|
|
ret = -EINVAL;
|
|
if (sscanf(page, "%u", &new_value) != 1)
|
|
goto out;
|
|
|
|
avc_cache_threshold = new_value;
|
|
|
|
ret = count;
|
|
out:
|
|
kfree(page);
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char *page;
|
|
ssize_t length;
|
|
|
|
page = (char *)__get_free_page(GFP_KERNEL);
|
|
if (!page)
|
|
return -ENOMEM;
|
|
|
|
length = avc_get_hash_stats(page);
|
|
if (length >= 0)
|
|
length = simple_read_from_buffer(buf, count, ppos, page, length);
|
|
free_page((unsigned long)page);
|
|
|
|
return length;
|
|
}
|
|
|
|
static const struct file_operations sel_avc_cache_threshold_ops = {
|
|
.read = sel_read_avc_cache_threshold,
|
|
.write = sel_write_avc_cache_threshold,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static const struct file_operations sel_avc_hash_stats_ops = {
|
|
.read = sel_read_avc_hash_stats,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
|
|
static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
|
|
{
|
|
int cpu;
|
|
|
|
for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
|
|
if (!cpu_possible(cpu))
|
|
continue;
|
|
*idx = cpu + 1;
|
|
return &per_cpu(avc_cache_stats, cpu);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
|
|
{
|
|
loff_t n = *pos - 1;
|
|
|
|
if (*pos == 0)
|
|
return SEQ_START_TOKEN;
|
|
|
|
return sel_avc_get_stat_idx(&n);
|
|
}
|
|
|
|
static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
return sel_avc_get_stat_idx(pos);
|
|
}
|
|
|
|
static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct avc_cache_stats *st = v;
|
|
|
|
if (v == SEQ_START_TOKEN)
|
|
seq_printf(seq, "lookups hits misses allocations reclaims "
|
|
"frees\n");
|
|
else {
|
|
unsigned int lookups = st->lookups;
|
|
unsigned int misses = st->misses;
|
|
unsigned int hits = lookups - misses;
|
|
seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
|
|
hits, misses, st->allocations,
|
|
st->reclaims, st->frees);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
|
|
{ }
|
|
|
|
static const struct seq_operations sel_avc_cache_stats_seq_ops = {
|
|
.start = sel_avc_stats_seq_start,
|
|
.next = sel_avc_stats_seq_next,
|
|
.show = sel_avc_stats_seq_show,
|
|
.stop = sel_avc_stats_seq_stop,
|
|
};
|
|
|
|
static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &sel_avc_cache_stats_seq_ops);
|
|
}
|
|
|
|
static const struct file_operations sel_avc_cache_stats_ops = {
|
|
.open = sel_open_avc_cache_stats,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release,
|
|
};
|
|
#endif
|
|
|
|
static int sel_make_avc_files(struct dentry *dir)
|
|
{
|
|
int i;
|
|
static struct tree_descr files[] = {
|
|
{ "cache_threshold",
|
|
&sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
|
|
{ "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
|
|
#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
|
|
{ "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
|
|
#endif
|
|
};
|
|
|
|
for (i = 0; i < ARRAY_SIZE(files); i++) {
|
|
struct inode *inode;
|
|
struct dentry *dentry;
|
|
|
|
dentry = d_alloc_name(dir, files[i].name);
|
|
if (!dentry)
|
|
return -ENOMEM;
|
|
|
|
inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
|
|
if (!inode)
|
|
return -ENOMEM;
|
|
|
|
inode->i_fop = files[i].ops;
|
|
inode->i_ino = ++sel_last_ino;
|
|
d_add(dentry, inode);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t sel_read_initcon(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char *con;
|
|
u32 sid, len;
|
|
ssize_t ret;
|
|
|
|
sid = file_inode(file)->i_ino&SEL_INO_MASK;
|
|
ret = security_sid_to_context(sid, &con, &len);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = simple_read_from_buffer(buf, count, ppos, con, len);
|
|
kfree(con);
|
|
return ret;
|
|
}
|
|
|
|
static const struct file_operations sel_initcon_ops = {
|
|
.read = sel_read_initcon,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static int sel_make_initcon_files(struct dentry *dir)
|
|
{
|
|
int i;
|
|
|
|
for (i = 1; i <= SECINITSID_NUM; i++) {
|
|
struct inode *inode;
|
|
struct dentry *dentry;
|
|
dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
|
|
if (!dentry)
|
|
return -ENOMEM;
|
|
|
|
inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
|
|
if (!inode)
|
|
return -ENOMEM;
|
|
|
|
inode->i_fop = &sel_initcon_ops;
|
|
inode->i_ino = i|SEL_INITCON_INO_OFFSET;
|
|
d_add(dentry, inode);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline unsigned long sel_class_to_ino(u16 class)
|
|
{
|
|
return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
|
|
}
|
|
|
|
static inline u16 sel_ino_to_class(unsigned long ino)
|
|
{
|
|
return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
|
|
}
|
|
|
|
static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
|
|
{
|
|
return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
|
|
}
|
|
|
|
static inline u32 sel_ino_to_perm(unsigned long ino)
|
|
{
|
|
return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
|
|
}
|
|
|
|
static ssize_t sel_read_class(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
unsigned long ino = file_inode(file)->i_ino;
|
|
char res[TMPBUFLEN];
|
|
ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
|
|
return simple_read_from_buffer(buf, count, ppos, res, len);
|
|
}
|
|
|
|
static const struct file_operations sel_class_ops = {
|
|
.read = sel_read_class,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static ssize_t sel_read_perm(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
unsigned long ino = file_inode(file)->i_ino;
|
|
char res[TMPBUFLEN];
|
|
ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
|
|
return simple_read_from_buffer(buf, count, ppos, res, len);
|
|
}
|
|
|
|
static const struct file_operations sel_perm_ops = {
|
|
.read = sel_read_perm,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static ssize_t sel_read_policycap(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
int value;
|
|
char tmpbuf[TMPBUFLEN];
|
|
ssize_t length;
|
|
unsigned long i_ino = file_inode(file)->i_ino;
|
|
|
|
value = security_policycap_supported(i_ino & SEL_INO_MASK);
|
|
length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
|
|
|
|
return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
|
|
}
|
|
|
|
static const struct file_operations sel_policycap_ops = {
|
|
.read = sel_read_policycap,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static int sel_make_perm_files(char *objclass, int classvalue,
|
|
struct dentry *dir)
|
|
{
|
|
int i, rc, nperms;
|
|
char **perms;
|
|
|
|
rc = security_get_permissions(objclass, &perms, &nperms);
|
|
if (rc)
|
|
return rc;
|
|
|
|
for (i = 0; i < nperms; i++) {
|
|
struct inode *inode;
|
|
struct dentry *dentry;
|
|
|
|
rc = -ENOMEM;
|
|
dentry = d_alloc_name(dir, perms[i]);
|
|
if (!dentry)
|
|
goto out;
|
|
|
|
rc = -ENOMEM;
|
|
inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
|
|
if (!inode)
|
|
goto out;
|
|
|
|
inode->i_fop = &sel_perm_ops;
|
|
/* i+1 since perm values are 1-indexed */
|
|
inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
|
|
d_add(dentry, inode);
|
|
}
|
|
rc = 0;
|
|
out:
|
|
for (i = 0; i < nperms; i++)
|
|
kfree(perms[i]);
|
|
kfree(perms);
|
|
return rc;
|
|
}
|
|
|
|
static int sel_make_class_dir_entries(char *classname, int index,
|
|
struct dentry *dir)
|
|
{
|
|
struct dentry *dentry = NULL;
|
|
struct inode *inode = NULL;
|
|
int rc;
|
|
|
|
dentry = d_alloc_name(dir, "index");
|
|
if (!dentry)
|
|
return -ENOMEM;
|
|
|
|
inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
|
|
if (!inode)
|
|
return -ENOMEM;
|
|
|
|
inode->i_fop = &sel_class_ops;
|
|
inode->i_ino = sel_class_to_ino(index);
|
|
d_add(dentry, inode);
|
|
|
|
dentry = sel_make_dir(dir, "perms", &last_class_ino);
|
|
if (IS_ERR(dentry))
|
|
return PTR_ERR(dentry);
|
|
|
|
rc = sel_make_perm_files(classname, index, dentry);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int sel_make_classes(void)
|
|
{
|
|
int rc, nclasses, i;
|
|
char **classes;
|
|
|
|
/* delete any existing entries */
|
|
sel_remove_entries(class_dir);
|
|
|
|
rc = security_get_classes(&classes, &nclasses);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* +2 since classes are 1-indexed */
|
|
last_class_ino = sel_class_to_ino(nclasses + 2);
|
|
|
|
for (i = 0; i < nclasses; i++) {
|
|
struct dentry *class_name_dir;
|
|
|
|
class_name_dir = sel_make_dir(class_dir, classes[i],
|
|
&last_class_ino);
|
|
if (IS_ERR(class_name_dir)) {
|
|
rc = PTR_ERR(class_name_dir);
|
|
goto out;
|
|
}
|
|
|
|
/* i+1 since class values are 1-indexed */
|
|
rc = sel_make_class_dir_entries(classes[i], i + 1,
|
|
class_name_dir);
|
|
if (rc)
|
|
goto out;
|
|
}
|
|
rc = 0;
|
|
out:
|
|
for (i = 0; i < nclasses; i++)
|
|
kfree(classes[i]);
|
|
kfree(classes);
|
|
return rc;
|
|
}
|
|
|
|
static int sel_make_policycap(void)
|
|
{
|
|
unsigned int iter;
|
|
struct dentry *dentry = NULL;
|
|
struct inode *inode = NULL;
|
|
|
|
sel_remove_entries(policycap_dir);
|
|
|
|
for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
|
|
if (iter < ARRAY_SIZE(policycap_names))
|
|
dentry = d_alloc_name(policycap_dir,
|
|
policycap_names[iter]);
|
|
else
|
|
dentry = d_alloc_name(policycap_dir, "unknown");
|
|
|
|
if (dentry == NULL)
|
|
return -ENOMEM;
|
|
|
|
inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
|
|
if (inode == NULL)
|
|
return -ENOMEM;
|
|
|
|
inode->i_fop = &sel_policycap_ops;
|
|
inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
|
|
d_add(dentry, inode);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
|
|
unsigned long *ino)
|
|
{
|
|
struct dentry *dentry = d_alloc_name(dir, name);
|
|
struct inode *inode;
|
|
|
|
if (!dentry)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
|
|
if (!inode) {
|
|
dput(dentry);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
inode->i_op = &simple_dir_inode_operations;
|
|
inode->i_fop = &simple_dir_operations;
|
|
inode->i_ino = ++(*ino);
|
|
/* directory inodes start off with i_nlink == 2 (for "." entry) */
|
|
inc_nlink(inode);
|
|
d_add(dentry, inode);
|
|
/* bump link count on parent directory, too */
|
|
inc_nlink(d_inode(dir));
|
|
|
|
return dentry;
|
|
}
|
|
|
|
static int sel_fill_super(struct super_block *sb, void *data, int silent)
|
|
{
|
|
int ret;
|
|
struct dentry *dentry;
|
|
struct inode *inode;
|
|
struct inode_security_struct *isec;
|
|
|
|
static struct tree_descr selinux_files[] = {
|
|
[SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
|
|
[SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
|
|
[SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
|
|
[SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
|
|
[SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
|
|
[SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
|
|
[SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
|
|
[SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
|
|
[SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
|
|
[SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
|
|
[SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
|
|
[SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
|
|
[SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
|
|
[SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
|
|
[SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
|
|
[SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
|
|
[SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
|
|
[SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops,
|
|
S_IWUGO},
|
|
/* last one */ {""}
|
|
};
|
|
ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
|
|
if (ret)
|
|
goto err;
|
|
|
|
bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &sel_last_ino);
|
|
if (IS_ERR(bool_dir)) {
|
|
ret = PTR_ERR(bool_dir);
|
|
bool_dir = NULL;
|
|
goto err;
|
|
}
|
|
|
|
ret = -ENOMEM;
|
|
dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
|
|
if (!dentry)
|
|
goto err;
|
|
|
|
ret = -ENOMEM;
|
|
inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
|
|
if (!inode)
|
|
goto err;
|
|
|
|
inode->i_ino = ++sel_last_ino;
|
|
isec = (struct inode_security_struct *)inode->i_security;
|
|
isec->sid = SECINITSID_DEVNULL;
|
|
isec->sclass = SECCLASS_CHR_FILE;
|
|
isec->initialized = 1;
|
|
|
|
init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
|
|
d_add(dentry, inode);
|
|
selinux_null.dentry = dentry;
|
|
|
|
dentry = sel_make_dir(sb->s_root, "avc", &sel_last_ino);
|
|
if (IS_ERR(dentry)) {
|
|
ret = PTR_ERR(dentry);
|
|
goto err;
|
|
}
|
|
|
|
ret = sel_make_avc_files(dentry);
|
|
if (ret)
|
|
goto err;
|
|
|
|
dentry = sel_make_dir(sb->s_root, "initial_contexts", &sel_last_ino);
|
|
if (IS_ERR(dentry)) {
|
|
ret = PTR_ERR(dentry);
|
|
goto err;
|
|
}
|
|
|
|
ret = sel_make_initcon_files(dentry);
|
|
if (ret)
|
|
goto err;
|
|
|
|
class_dir = sel_make_dir(sb->s_root, "class", &sel_last_ino);
|
|
if (IS_ERR(class_dir)) {
|
|
ret = PTR_ERR(class_dir);
|
|
class_dir = NULL;
|
|
goto err;
|
|
}
|
|
|
|
policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities", &sel_last_ino);
|
|
if (IS_ERR(policycap_dir)) {
|
|
ret = PTR_ERR(policycap_dir);
|
|
policycap_dir = NULL;
|
|
goto err;
|
|
}
|
|
return 0;
|
|
err:
|
|
printk(KERN_ERR "SELinux: %s: failed while creating inodes\n",
|
|
__func__);
|
|
return ret;
|
|
}
|
|
|
|
static struct dentry *sel_mount(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data)
|
|
{
|
|
return mount_single(fs_type, flags, data, sel_fill_super);
|
|
}
|
|
|
|
static struct file_system_type sel_fs_type = {
|
|
.name = "selinuxfs",
|
|
.mount = sel_mount,
|
|
.kill_sb = kill_litter_super,
|
|
};
|
|
|
|
struct vfsmount *selinuxfs_mount;
|
|
|
|
static int __init init_sel_fs(void)
|
|
{
|
|
int err;
|
|
|
|
if (!selinux_enabled)
|
|
return 0;
|
|
|
|
err = sysfs_create_mount_point(fs_kobj, "selinux");
|
|
if (err)
|
|
return err;
|
|
|
|
err = register_filesystem(&sel_fs_type);
|
|
if (err) {
|
|
sysfs_remove_mount_point(fs_kobj, "selinux");
|
|
return err;
|
|
}
|
|
|
|
selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
|
|
if (IS_ERR(selinuxfs_mount)) {
|
|
printk(KERN_ERR "selinuxfs: could not mount!\n");
|
|
err = PTR_ERR(selinuxfs_mount);
|
|
selinuxfs_mount = NULL;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
__initcall(init_sel_fs);
|
|
|
|
#ifdef CONFIG_SECURITY_SELINUX_DISABLE
|
|
void exit_sel_fs(void)
|
|
{
|
|
sysfs_remove_mount_point(fs_kobj, "selinux");
|
|
kern_unmount(selinuxfs_mount);
|
|
unregister_filesystem(&sel_fs_type);
|
|
}
|
|
#endif
|