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![Zhihao Cheng](/assets/img/avatar_default.png)
Commit7bc3e6e55a
("proc: Use a list of inodes to flush from proc") moved proc_flush_task() behind __exit_signal(). Then, process systemd can take long period high cpu usage during releasing task in following concurrent processes: systemd ps kernel_waitid stat(/proc/tgid) do_wait filename_lookup wait_consider_task lookup_fast release_task __exit_signal __unhash_process detach_pid __change_pid // remove task->pid_links d_revalidate -> pid_revalidate // 0 d_invalidate(/proc/tgid) shrink_dcache_parent(/proc/tgid) d_walk(/proc/tgid) spin_lock_nested(/proc/tgid/fd) // iterating opened fd proc_flush_pid | d_invalidate (/proc/tgid/fd) | shrink_dcache_parent(/proc/tgid/fd) | shrink_dentry_list(subdirs) ↓ shrink_lock_dentry(/proc/tgid/fd) --> race on dentry lock Function d_invalidate() will remove dentry from hash firstly, but why does proc_flush_pid() process dentry '/proc/tgid/fd' before dentry '/proc/tgid'? That's because proc_pid_make_inode() adds proc inode in reverse order by invoking hlist_add_head_rcu(). But proc should not add any inodes under '/proc/tgid' except '/proc/tgid/task/pid', fix it by adding inode into 'pid->inodes' only if the inode is /proc/tgid or /proc/tgid/task/pid. Performance regression: Create 200 tasks, each task open one file for 50,000 times. Kill all tasks when opened files exceed 10,000,000 (cat /proc/sys/fs/file-nr). Before fix: $ time killall -wq aa real 4m40.946s # During this period, we can see 'ps' and 'systemd' taking high cpu usage. After fix: $ time killall -wq aa real 1m20.732s # During this period, we can see 'systemd' taking high cpu usage. Link: https://lkml.kernel.org/r/20220713130029.4133533-1-chengzhihao1@huawei.com Fixes:7bc3e6e55a
("proc: Use a list of inodes to flush from proc") Link: https://bugzilla.kernel.org/show_bug.cgi?id=216054 Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com> Signed-off-by: Zhang Yi <yi.zhang@huawei.com> Suggested-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Brian Foster <bfoster@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Eric Biederman <ebiederm@xmission.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Baoquan He <bhe@redhat.com> Cc: Kalesh Singh <kaleshsingh@google.com> Cc: Yu Kuai <yukuai3@huawei.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
3909 lines
93 KiB
C
3909 lines
93 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/fs/proc/base.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* proc base directory handling functions
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*
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* 1999, Al Viro. Rewritten. Now it covers the whole per-process part.
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* Instead of using magical inumbers to determine the kind of object
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* we allocate and fill in-core inodes upon lookup. They don't even
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* go into icache. We cache the reference to task_struct upon lookup too.
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* Eventually it should become a filesystem in its own. We don't use the
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* rest of procfs anymore.
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*
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*
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* Changelog:
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* 17-Jan-2005
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* Allan Bezerra
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* Bruna Moreira <bruna.moreira@indt.org.br>
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* Edjard Mota <edjard.mota@indt.org.br>
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* Ilias Biris <ilias.biris@indt.org.br>
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* Mauricio Lin <mauricio.lin@indt.org.br>
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*
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* Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
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*
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* A new process specific entry (smaps) included in /proc. It shows the
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* size of rss for each memory area. The maps entry lacks information
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* about physical memory size (rss) for each mapped file, i.e.,
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* rss information for executables and library files.
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* This additional information is useful for any tools that need to know
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* about physical memory consumption for a process specific library.
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*
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* Changelog:
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* 21-Feb-2005
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* Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
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* Pud inclusion in the page table walking.
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*
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* ChangeLog:
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* 10-Mar-2005
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* 10LE Instituto Nokia de Tecnologia - INdT:
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* A better way to walks through the page table as suggested by Hugh Dickins.
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*
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* Simo Piiroinen <simo.piiroinen@nokia.com>:
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* Smaps information related to shared, private, clean and dirty pages.
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*
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* Paul Mundt <paul.mundt@nokia.com>:
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* Overall revision about smaps.
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*/
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#include <linux/uaccess.h>
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#include <linux/errno.h>
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#include <linux/time.h>
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#include <linux/proc_fs.h>
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#include <linux/stat.h>
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#include <linux/task_io_accounting_ops.h>
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#include <linux/init.h>
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#include <linux/capability.h>
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#include <linux/file.h>
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#include <linux/fdtable.h>
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#include <linux/generic-radix-tree.h>
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#include <linux/string.h>
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#include <linux/seq_file.h>
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#include <linux/namei.h>
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#include <linux/mnt_namespace.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/rcupdate.h>
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#include <linux/kallsyms.h>
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#include <linux/stacktrace.h>
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#include <linux/resource.h>
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#include <linux/module.h>
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#include <linux/mount.h>
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#include <linux/security.h>
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#include <linux/ptrace.h>
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#include <linux/printk.h>
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#include <linux/cache.h>
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#include <linux/cgroup.h>
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#include <linux/cpuset.h>
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#include <linux/audit.h>
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#include <linux/poll.h>
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#include <linux/nsproxy.h>
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#include <linux/oom.h>
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#include <linux/elf.h>
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#include <linux/pid_namespace.h>
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#include <linux/user_namespace.h>
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#include <linux/fs_struct.h>
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#include <linux/slab.h>
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#include <linux/sched/autogroup.h>
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#include <linux/sched/mm.h>
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#include <linux/sched/coredump.h>
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#include <linux/sched/debug.h>
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#include <linux/sched/stat.h>
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#include <linux/posix-timers.h>
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#include <linux/time_namespace.h>
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#include <linux/resctrl.h>
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#include <linux/cn_proc.h>
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#include <trace/events/oom.h>
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#include "internal.h"
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#include "fd.h"
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#include "../../lib/kstrtox.h"
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/* NOTE:
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* Implementing inode permission operations in /proc is almost
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* certainly an error. Permission checks need to happen during
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* each system call not at open time. The reason is that most of
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* what we wish to check for permissions in /proc varies at runtime.
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*
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* The classic example of a problem is opening file descriptors
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* in /proc for a task before it execs a suid executable.
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*/
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static u8 nlink_tid __ro_after_init;
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static u8 nlink_tgid __ro_after_init;
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struct pid_entry {
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const char *name;
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unsigned int len;
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umode_t mode;
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const struct inode_operations *iop;
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const struct file_operations *fop;
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union proc_op op;
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};
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#define NOD(NAME, MODE, IOP, FOP, OP) { \
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.name = (NAME), \
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.len = sizeof(NAME) - 1, \
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.mode = MODE, \
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.iop = IOP, \
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.fop = FOP, \
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.op = OP, \
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}
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#define DIR(NAME, MODE, iops, fops) \
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NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} )
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#define LNK(NAME, get_link) \
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NOD(NAME, (S_IFLNK|S_IRWXUGO), \
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&proc_pid_link_inode_operations, NULL, \
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{ .proc_get_link = get_link } )
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#define REG(NAME, MODE, fops) \
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NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {})
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#define ONE(NAME, MODE, show) \
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NOD(NAME, (S_IFREG|(MODE)), \
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NULL, &proc_single_file_operations, \
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{ .proc_show = show } )
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#define ATTR(LSM, NAME, MODE) \
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NOD(NAME, (S_IFREG|(MODE)), \
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NULL, &proc_pid_attr_operations, \
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{ .lsm = LSM })
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/*
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* Count the number of hardlinks for the pid_entry table, excluding the .
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* and .. links.
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*/
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static unsigned int __init pid_entry_nlink(const struct pid_entry *entries,
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unsigned int n)
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{
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unsigned int i;
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unsigned int count;
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count = 2;
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for (i = 0; i < n; ++i) {
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if (S_ISDIR(entries[i].mode))
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++count;
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}
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return count;
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}
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static int get_task_root(struct task_struct *task, struct path *root)
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{
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int result = -ENOENT;
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task_lock(task);
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if (task->fs) {
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get_fs_root(task->fs, root);
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result = 0;
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}
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task_unlock(task);
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return result;
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}
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static int proc_cwd_link(struct dentry *dentry, struct path *path)
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{
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struct task_struct *task = get_proc_task(d_inode(dentry));
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int result = -ENOENT;
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if (task) {
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task_lock(task);
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if (task->fs) {
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get_fs_pwd(task->fs, path);
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result = 0;
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}
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task_unlock(task);
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put_task_struct(task);
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}
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return result;
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}
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static int proc_root_link(struct dentry *dentry, struct path *path)
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{
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struct task_struct *task = get_proc_task(d_inode(dentry));
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int result = -ENOENT;
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if (task) {
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result = get_task_root(task, path);
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put_task_struct(task);
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}
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return result;
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}
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/*
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* If the user used setproctitle(), we just get the string from
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* user space at arg_start, and limit it to a maximum of one page.
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*/
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static ssize_t get_mm_proctitle(struct mm_struct *mm, char __user *buf,
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size_t count, unsigned long pos,
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unsigned long arg_start)
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{
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char *page;
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int ret, got;
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if (pos >= PAGE_SIZE)
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return 0;
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page = (char *)__get_free_page(GFP_KERNEL);
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if (!page)
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return -ENOMEM;
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ret = 0;
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got = access_remote_vm(mm, arg_start, page, PAGE_SIZE, FOLL_ANON);
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if (got > 0) {
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int len = strnlen(page, got);
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/* Include the NUL character if it was found */
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if (len < got)
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len++;
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if (len > pos) {
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len -= pos;
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if (len > count)
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len = count;
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len -= copy_to_user(buf, page+pos, len);
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if (!len)
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len = -EFAULT;
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ret = len;
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}
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}
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free_page((unsigned long)page);
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return ret;
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}
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static ssize_t get_mm_cmdline(struct mm_struct *mm, char __user *buf,
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size_t count, loff_t *ppos)
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{
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unsigned long arg_start, arg_end, env_start, env_end;
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unsigned long pos, len;
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char *page, c;
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/* Check if process spawned far enough to have cmdline. */
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if (!mm->env_end)
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return 0;
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spin_lock(&mm->arg_lock);
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arg_start = mm->arg_start;
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arg_end = mm->arg_end;
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env_start = mm->env_start;
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env_end = mm->env_end;
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spin_unlock(&mm->arg_lock);
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if (arg_start >= arg_end)
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return 0;
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/*
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* We allow setproctitle() to overwrite the argument
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* strings, and overflow past the original end. But
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* only when it overflows into the environment area.
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*/
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if (env_start != arg_end || env_end < env_start)
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env_start = env_end = arg_end;
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len = env_end - arg_start;
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/* We're not going to care if "*ppos" has high bits set */
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pos = *ppos;
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if (pos >= len)
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return 0;
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if (count > len - pos)
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count = len - pos;
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if (!count)
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return 0;
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/*
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* Magical special case: if the argv[] end byte is not
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* zero, the user has overwritten it with setproctitle(3).
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*
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* Possible future enhancement: do this only once when
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* pos is 0, and set a flag in the 'struct file'.
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*/
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if (access_remote_vm(mm, arg_end-1, &c, 1, FOLL_ANON) == 1 && c)
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return get_mm_proctitle(mm, buf, count, pos, arg_start);
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/*
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* For the non-setproctitle() case we limit things strictly
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* to the [arg_start, arg_end[ range.
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*/
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pos += arg_start;
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if (pos < arg_start || pos >= arg_end)
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return 0;
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if (count > arg_end - pos)
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count = arg_end - pos;
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page = (char *)__get_free_page(GFP_KERNEL);
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if (!page)
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return -ENOMEM;
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len = 0;
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while (count) {
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int got;
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size_t size = min_t(size_t, PAGE_SIZE, count);
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got = access_remote_vm(mm, pos, page, size, FOLL_ANON);
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if (got <= 0)
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break;
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got -= copy_to_user(buf, page, got);
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if (unlikely(!got)) {
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if (!len)
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len = -EFAULT;
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break;
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}
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pos += got;
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buf += got;
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len += got;
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count -= got;
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}
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free_page((unsigned long)page);
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return len;
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}
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static ssize_t get_task_cmdline(struct task_struct *tsk, char __user *buf,
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size_t count, loff_t *pos)
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{
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struct mm_struct *mm;
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ssize_t ret;
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mm = get_task_mm(tsk);
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if (!mm)
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return 0;
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ret = get_mm_cmdline(mm, buf, count, pos);
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mmput(mm);
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return ret;
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}
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static ssize_t proc_pid_cmdline_read(struct file *file, char __user *buf,
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size_t count, loff_t *pos)
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{
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struct task_struct *tsk;
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ssize_t ret;
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BUG_ON(*pos < 0);
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tsk = get_proc_task(file_inode(file));
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if (!tsk)
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return -ESRCH;
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ret = get_task_cmdline(tsk, buf, count, pos);
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put_task_struct(tsk);
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if (ret > 0)
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*pos += ret;
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return ret;
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}
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static const struct file_operations proc_pid_cmdline_ops = {
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.read = proc_pid_cmdline_read,
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.llseek = generic_file_llseek,
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};
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#ifdef CONFIG_KALLSYMS
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/*
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* Provides a wchan file via kallsyms in a proper one-value-per-file format.
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* Returns the resolved symbol. If that fails, simply return the address.
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*/
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static int proc_pid_wchan(struct seq_file *m, struct pid_namespace *ns,
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struct pid *pid, struct task_struct *task)
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{
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unsigned long wchan;
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char symname[KSYM_NAME_LEN];
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if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS))
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goto print0;
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wchan = get_wchan(task);
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if (wchan && !lookup_symbol_name(wchan, symname)) {
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seq_puts(m, symname);
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return 0;
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}
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print0:
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seq_putc(m, '0');
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return 0;
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}
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#endif /* CONFIG_KALLSYMS */
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static int lock_trace(struct task_struct *task)
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{
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int err = down_read_killable(&task->signal->exec_update_lock);
|
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if (err)
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return err;
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if (!ptrace_may_access(task, PTRACE_MODE_ATTACH_FSCREDS)) {
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up_read(&task->signal->exec_update_lock);
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return -EPERM;
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}
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return 0;
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}
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|
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static void unlock_trace(struct task_struct *task)
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{
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up_read(&task->signal->exec_update_lock);
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}
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|
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#ifdef CONFIG_STACKTRACE
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|
|
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#define MAX_STACK_TRACE_DEPTH 64
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|
|
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static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns,
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struct pid *pid, struct task_struct *task)
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{
|
|
unsigned long *entries;
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int err;
|
|
|
|
/*
|
|
* The ability to racily run the kernel stack unwinder on a running task
|
|
* and then observe the unwinder output is scary; while it is useful for
|
|
* debugging kernel issues, it can also allow an attacker to leak kernel
|
|
* stack contents.
|
|
* Doing this in a manner that is at least safe from races would require
|
|
* some work to ensure that the remote task can not be scheduled; and
|
|
* even then, this would still expose the unwinder as local attack
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|
* surface.
|
|
* Therefore, this interface is restricted to root.
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|
*/
|
|
if (!file_ns_capable(m->file, &init_user_ns, CAP_SYS_ADMIN))
|
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return -EACCES;
|
|
|
|
entries = kmalloc_array(MAX_STACK_TRACE_DEPTH, sizeof(*entries),
|
|
GFP_KERNEL);
|
|
if (!entries)
|
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return -ENOMEM;
|
|
|
|
err = lock_trace(task);
|
|
if (!err) {
|
|
unsigned int i, nr_entries;
|
|
|
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nr_entries = stack_trace_save_tsk(task, entries,
|
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MAX_STACK_TRACE_DEPTH, 0);
|
|
|
|
for (i = 0; i < nr_entries; i++) {
|
|
seq_printf(m, "[<0>] %pB\n", (void *)entries[i]);
|
|
}
|
|
|
|
unlock_trace(task);
|
|
}
|
|
kfree(entries);
|
|
|
|
return err;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_SCHED_INFO
|
|
/*
|
|
* Provides /proc/PID/schedstat
|
|
*/
|
|
static int proc_pid_schedstat(struct seq_file *m, struct pid_namespace *ns,
|
|
struct pid *pid, struct task_struct *task)
|
|
{
|
|
if (unlikely(!sched_info_on()))
|
|
seq_puts(m, "0 0 0\n");
|
|
else
|
|
seq_printf(m, "%llu %llu %lu\n",
|
|
(unsigned long long)task->se.sum_exec_runtime,
|
|
(unsigned long long)task->sched_info.run_delay,
|
|
task->sched_info.pcount);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_LATENCYTOP
|
|
static int lstats_show_proc(struct seq_file *m, void *v)
|
|
{
|
|
int i;
|
|
struct inode *inode = m->private;
|
|
struct task_struct *task = get_proc_task(inode);
|
|
|
|
if (!task)
|
|
return -ESRCH;
|
|
seq_puts(m, "Latency Top version : v0.1\n");
|
|
for (i = 0; i < LT_SAVECOUNT; i++) {
|
|
struct latency_record *lr = &task->latency_record[i];
|
|
if (lr->backtrace[0]) {
|
|
int q;
|
|
seq_printf(m, "%i %li %li",
|
|
lr->count, lr->time, lr->max);
|
|
for (q = 0; q < LT_BACKTRACEDEPTH; q++) {
|
|
unsigned long bt = lr->backtrace[q];
|
|
|
|
if (!bt)
|
|
break;
|
|
seq_printf(m, " %ps", (void *)bt);
|
|
}
|
|
seq_putc(m, '\n');
|
|
}
|
|
|
|
}
|
|
put_task_struct(task);
|
|
return 0;
|
|
}
|
|
|
|
static int lstats_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, lstats_show_proc, inode);
|
|
}
|
|
|
|
static ssize_t lstats_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *offs)
|
|
{
|
|
struct task_struct *task = get_proc_task(file_inode(file));
|
|
|
|
if (!task)
|
|
return -ESRCH;
|
|
clear_tsk_latency_tracing(task);
|
|
put_task_struct(task);
|
|
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations proc_lstats_operations = {
|
|
.open = lstats_open,
|
|
.read = seq_read,
|
|
.write = lstats_write,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
#endif
|
|
|
|
static int proc_oom_score(struct seq_file *m, struct pid_namespace *ns,
|
|
struct pid *pid, struct task_struct *task)
|
|
{
|
|
unsigned long totalpages = totalram_pages() + total_swap_pages;
|
|
unsigned long points = 0;
|
|
long badness;
|
|
|
|
badness = oom_badness(task, totalpages);
|
|
/*
|
|
* Special case OOM_SCORE_ADJ_MIN for all others scale the
|
|
* badness value into [0, 2000] range which we have been
|
|
* exporting for a long time so userspace might depend on it.
|
|
*/
|
|
if (badness != LONG_MIN)
|
|
points = (1000 + badness * 1000 / (long)totalpages) * 2 / 3;
|
|
|
|
seq_printf(m, "%lu\n", points);
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct limit_names {
|
|
const char *name;
|
|
const char *unit;
|
|
};
|
|
|
|
static const struct limit_names lnames[RLIM_NLIMITS] = {
|
|
[RLIMIT_CPU] = {"Max cpu time", "seconds"},
|
|
[RLIMIT_FSIZE] = {"Max file size", "bytes"},
|
|
[RLIMIT_DATA] = {"Max data size", "bytes"},
|
|
[RLIMIT_STACK] = {"Max stack size", "bytes"},
|
|
[RLIMIT_CORE] = {"Max core file size", "bytes"},
|
|
[RLIMIT_RSS] = {"Max resident set", "bytes"},
|
|
[RLIMIT_NPROC] = {"Max processes", "processes"},
|
|
[RLIMIT_NOFILE] = {"Max open files", "files"},
|
|
[RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"},
|
|
[RLIMIT_AS] = {"Max address space", "bytes"},
|
|
[RLIMIT_LOCKS] = {"Max file locks", "locks"},
|
|
[RLIMIT_SIGPENDING] = {"Max pending signals", "signals"},
|
|
[RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"},
|
|
[RLIMIT_NICE] = {"Max nice priority", NULL},
|
|
[RLIMIT_RTPRIO] = {"Max realtime priority", NULL},
|
|
[RLIMIT_RTTIME] = {"Max realtime timeout", "us"},
|
|
};
|
|
|
|
/* Display limits for a process */
|
|
static int proc_pid_limits(struct seq_file *m, struct pid_namespace *ns,
|
|
struct pid *pid, struct task_struct *task)
|
|
{
|
|
unsigned int i;
|
|
unsigned long flags;
|
|
|
|
struct rlimit rlim[RLIM_NLIMITS];
|
|
|
|
if (!lock_task_sighand(task, &flags))
|
|
return 0;
|
|
memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS);
|
|
unlock_task_sighand(task, &flags);
|
|
|
|
/*
|
|
* print the file header
|
|
*/
|
|
seq_puts(m, "Limit "
|
|
"Soft Limit "
|
|
"Hard Limit "
|
|
"Units \n");
|
|
|
|
for (i = 0; i < RLIM_NLIMITS; i++) {
|
|
if (rlim[i].rlim_cur == RLIM_INFINITY)
|
|
seq_printf(m, "%-25s %-20s ",
|
|
lnames[i].name, "unlimited");
|
|
else
|
|
seq_printf(m, "%-25s %-20lu ",
|
|
lnames[i].name, rlim[i].rlim_cur);
|
|
|
|
if (rlim[i].rlim_max == RLIM_INFINITY)
|
|
seq_printf(m, "%-20s ", "unlimited");
|
|
else
|
|
seq_printf(m, "%-20lu ", rlim[i].rlim_max);
|
|
|
|
if (lnames[i].unit)
|
|
seq_printf(m, "%-10s\n", lnames[i].unit);
|
|
else
|
|
seq_putc(m, '\n');
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
|
|
static int proc_pid_syscall(struct seq_file *m, struct pid_namespace *ns,
|
|
struct pid *pid, struct task_struct *task)
|
|
{
|
|
struct syscall_info info;
|
|
u64 *args = &info.data.args[0];
|
|
int res;
|
|
|
|
res = lock_trace(task);
|
|
if (res)
|
|
return res;
|
|
|
|
if (task_current_syscall(task, &info))
|
|
seq_puts(m, "running\n");
|
|
else if (info.data.nr < 0)
|
|
seq_printf(m, "%d 0x%llx 0x%llx\n",
|
|
info.data.nr, info.sp, info.data.instruction_pointer);
|
|
else
|
|
seq_printf(m,
|
|
"%d 0x%llx 0x%llx 0x%llx 0x%llx 0x%llx 0x%llx 0x%llx 0x%llx\n",
|
|
info.data.nr,
|
|
args[0], args[1], args[2], args[3], args[4], args[5],
|
|
info.sp, info.data.instruction_pointer);
|
|
unlock_trace(task);
|
|
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
|
|
|
|
/************************************************************************/
|
|
/* Here the fs part begins */
|
|
/************************************************************************/
|
|
|
|
/* permission checks */
|
|
static bool proc_fd_access_allowed(struct inode *inode)
|
|
{
|
|
struct task_struct *task;
|
|
bool allowed = false;
|
|
/* Allow access to a task's file descriptors if it is us or we
|
|
* may use ptrace attach to the process and find out that
|
|
* information.
|
|
*/
|
|
task = get_proc_task(inode);
|
|
if (task) {
|
|
allowed = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS);
|
|
put_task_struct(task);
|
|
}
|
|
return allowed;
|
|
}
|
|
|
|
int proc_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
|
|
struct iattr *attr)
|
|
{
|
|
int error;
|
|
struct inode *inode = d_inode(dentry);
|
|
|
|
if (attr->ia_valid & ATTR_MODE)
|
|
return -EPERM;
|
|
|
|
error = setattr_prepare(&init_user_ns, dentry, attr);
|
|
if (error)
|
|
return error;
|
|
|
|
setattr_copy(&init_user_ns, inode, attr);
|
|
mark_inode_dirty(inode);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* May current process learn task's sched/cmdline info (for hide_pid_min=1)
|
|
* or euid/egid (for hide_pid_min=2)?
|
|
*/
|
|
static bool has_pid_permissions(struct proc_fs_info *fs_info,
|
|
struct task_struct *task,
|
|
enum proc_hidepid hide_pid_min)
|
|
{
|
|
/*
|
|
* If 'hidpid' mount option is set force a ptrace check,
|
|
* we indicate that we are using a filesystem syscall
|
|
* by passing PTRACE_MODE_READ_FSCREDS
|
|
*/
|
|
if (fs_info->hide_pid == HIDEPID_NOT_PTRACEABLE)
|
|
return ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS);
|
|
|
|
if (fs_info->hide_pid < hide_pid_min)
|
|
return true;
|
|
if (in_group_p(fs_info->pid_gid))
|
|
return true;
|
|
return ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS);
|
|
}
|
|
|
|
|
|
static int proc_pid_permission(struct user_namespace *mnt_userns,
|
|
struct inode *inode, int mask)
|
|
{
|
|
struct proc_fs_info *fs_info = proc_sb_info(inode->i_sb);
|
|
struct task_struct *task;
|
|
bool has_perms;
|
|
|
|
task = get_proc_task(inode);
|
|
if (!task)
|
|
return -ESRCH;
|
|
has_perms = has_pid_permissions(fs_info, task, HIDEPID_NO_ACCESS);
|
|
put_task_struct(task);
|
|
|
|
if (!has_perms) {
|
|
if (fs_info->hide_pid == HIDEPID_INVISIBLE) {
|
|
/*
|
|
* Let's make getdents(), stat(), and open()
|
|
* consistent with each other. If a process
|
|
* may not stat() a file, it shouldn't be seen
|
|
* in procfs at all.
|
|
*/
|
|
return -ENOENT;
|
|
}
|
|
|
|
return -EPERM;
|
|
}
|
|
return generic_permission(&init_user_ns, inode, mask);
|
|
}
|
|
|
|
|
|
|
|
static const struct inode_operations proc_def_inode_operations = {
|
|
.setattr = proc_setattr,
|
|
};
|
|
|
|
static int proc_single_show(struct seq_file *m, void *v)
|
|
{
|
|
struct inode *inode = m->private;
|
|
struct pid_namespace *ns = proc_pid_ns(inode->i_sb);
|
|
struct pid *pid = proc_pid(inode);
|
|
struct task_struct *task;
|
|
int ret;
|
|
|
|
task = get_pid_task(pid, PIDTYPE_PID);
|
|
if (!task)
|
|
return -ESRCH;
|
|
|
|
ret = PROC_I(inode)->op.proc_show(m, ns, pid, task);
|
|
|
|
put_task_struct(task);
|
|
return ret;
|
|
}
|
|
|
|
static int proc_single_open(struct inode *inode, struct file *filp)
|
|
{
|
|
return single_open(filp, proc_single_show, inode);
|
|
}
|
|
|
|
static const struct file_operations proc_single_file_operations = {
|
|
.open = proc_single_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
|
|
struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode)
|
|
{
|
|
struct task_struct *task = get_proc_task(inode);
|
|
struct mm_struct *mm = ERR_PTR(-ESRCH);
|
|
|
|
if (task) {
|
|
mm = mm_access(task, mode | PTRACE_MODE_FSCREDS);
|
|
put_task_struct(task);
|
|
|
|
if (!IS_ERR_OR_NULL(mm)) {
|
|
/* ensure this mm_struct can't be freed */
|
|
mmgrab(mm);
|
|
/* but do not pin its memory */
|
|
mmput(mm);
|
|
}
|
|
}
|
|
|
|
return mm;
|
|
}
|
|
|
|
static int __mem_open(struct inode *inode, struct file *file, unsigned int mode)
|
|
{
|
|
struct mm_struct *mm = proc_mem_open(inode, mode);
|
|
|
|
if (IS_ERR(mm))
|
|
return PTR_ERR(mm);
|
|
|
|
file->private_data = mm;
|
|
return 0;
|
|
}
|
|
|
|
static int mem_open(struct inode *inode, struct file *file)
|
|
{
|
|
int ret = __mem_open(inode, file, PTRACE_MODE_ATTACH);
|
|
|
|
/* OK to pass negative loff_t, we can catch out-of-range */
|
|
file->f_mode |= FMODE_UNSIGNED_OFFSET;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t mem_rw(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos, int write)
|
|
{
|
|
struct mm_struct *mm = file->private_data;
|
|
unsigned long addr = *ppos;
|
|
ssize_t copied;
|
|
char *page;
|
|
unsigned int flags;
|
|
|
|
if (!mm)
|
|
return 0;
|
|
|
|
page = (char *)__get_free_page(GFP_KERNEL);
|
|
if (!page)
|
|
return -ENOMEM;
|
|
|
|
copied = 0;
|
|
if (!mmget_not_zero(mm))
|
|
goto free;
|
|
|
|
flags = FOLL_FORCE | (write ? FOLL_WRITE : 0);
|
|
|
|
while (count > 0) {
|
|
size_t this_len = min_t(size_t, count, PAGE_SIZE);
|
|
|
|
if (write && copy_from_user(page, buf, this_len)) {
|
|
copied = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
this_len = access_remote_vm(mm, addr, page, this_len, flags);
|
|
if (!this_len) {
|
|
if (!copied)
|
|
copied = -EIO;
|
|
break;
|
|
}
|
|
|
|
if (!write && copy_to_user(buf, page, this_len)) {
|
|
copied = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
buf += this_len;
|
|
addr += this_len;
|
|
copied += this_len;
|
|
count -= this_len;
|
|
}
|
|
*ppos = addr;
|
|
|
|
mmput(mm);
|
|
free:
|
|
free_page((unsigned long) page);
|
|
return copied;
|
|
}
|
|
|
|
static ssize_t mem_read(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
return mem_rw(file, buf, count, ppos, 0);
|
|
}
|
|
|
|
static ssize_t mem_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
return mem_rw(file, (char __user*)buf, count, ppos, 1);
|
|
}
|
|
|
|
loff_t mem_lseek(struct file *file, loff_t offset, int orig)
|
|
{
|
|
switch (orig) {
|
|
case 0:
|
|
file->f_pos = offset;
|
|
break;
|
|
case 1:
|
|
file->f_pos += offset;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
force_successful_syscall_return();
|
|
return file->f_pos;
|
|
}
|
|
|
|
static int mem_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct mm_struct *mm = file->private_data;
|
|
if (mm)
|
|
mmdrop(mm);
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations proc_mem_operations = {
|
|
.llseek = mem_lseek,
|
|
.read = mem_read,
|
|
.write = mem_write,
|
|
.open = mem_open,
|
|
.release = mem_release,
|
|
};
|
|
|
|
static int environ_open(struct inode *inode, struct file *file)
|
|
{
|
|
return __mem_open(inode, file, PTRACE_MODE_READ);
|
|
}
|
|
|
|
static ssize_t environ_read(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char *page;
|
|
unsigned long src = *ppos;
|
|
int ret = 0;
|
|
struct mm_struct *mm = file->private_data;
|
|
unsigned long env_start, env_end;
|
|
|
|
/* Ensure the process spawned far enough to have an environment. */
|
|
if (!mm || !mm->env_end)
|
|
return 0;
|
|
|
|
page = (char *)__get_free_page(GFP_KERNEL);
|
|
if (!page)
|
|
return -ENOMEM;
|
|
|
|
ret = 0;
|
|
if (!mmget_not_zero(mm))
|
|
goto free;
|
|
|
|
spin_lock(&mm->arg_lock);
|
|
env_start = mm->env_start;
|
|
env_end = mm->env_end;
|
|
spin_unlock(&mm->arg_lock);
|
|
|
|
while (count > 0) {
|
|
size_t this_len, max_len;
|
|
int retval;
|
|
|
|
if (src >= (env_end - env_start))
|
|
break;
|
|
|
|
this_len = env_end - (env_start + src);
|
|
|
|
max_len = min_t(size_t, PAGE_SIZE, count);
|
|
this_len = min(max_len, this_len);
|
|
|
|
retval = access_remote_vm(mm, (env_start + src), page, this_len, FOLL_ANON);
|
|
|
|
if (retval <= 0) {
|
|
ret = retval;
|
|
break;
|
|
}
|
|
|
|
if (copy_to_user(buf, page, retval)) {
|
|
ret = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
ret += retval;
|
|
src += retval;
|
|
buf += retval;
|
|
count -= retval;
|
|
}
|
|
*ppos = src;
|
|
mmput(mm);
|
|
|
|
free:
|
|
free_page((unsigned long) page);
|
|
return ret;
|
|
}
|
|
|
|
static const struct file_operations proc_environ_operations = {
|
|
.open = environ_open,
|
|
.read = environ_read,
|
|
.llseek = generic_file_llseek,
|
|
.release = mem_release,
|
|
};
|
|
|
|
static int auxv_open(struct inode *inode, struct file *file)
|
|
{
|
|
return __mem_open(inode, file, PTRACE_MODE_READ_FSCREDS);
|
|
}
|
|
|
|
static ssize_t auxv_read(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct mm_struct *mm = file->private_data;
|
|
unsigned int nwords = 0;
|
|
|
|
if (!mm)
|
|
return 0;
|
|
do {
|
|
nwords += 2;
|
|
} while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
|
|
return simple_read_from_buffer(buf, count, ppos, mm->saved_auxv,
|
|
nwords * sizeof(mm->saved_auxv[0]));
|
|
}
|
|
|
|
static const struct file_operations proc_auxv_operations = {
|
|
.open = auxv_open,
|
|
.read = auxv_read,
|
|
.llseek = generic_file_llseek,
|
|
.release = mem_release,
|
|
};
|
|
|
|
static ssize_t oom_adj_read(struct file *file, char __user *buf, size_t count,
|
|
loff_t *ppos)
|
|
{
|
|
struct task_struct *task = get_proc_task(file_inode(file));
|
|
char buffer[PROC_NUMBUF];
|
|
int oom_adj = OOM_ADJUST_MIN;
|
|
size_t len;
|
|
|
|
if (!task)
|
|
return -ESRCH;
|
|
if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MAX)
|
|
oom_adj = OOM_ADJUST_MAX;
|
|
else
|
|
oom_adj = (task->signal->oom_score_adj * -OOM_DISABLE) /
|
|
OOM_SCORE_ADJ_MAX;
|
|
put_task_struct(task);
|
|
if (oom_adj > OOM_ADJUST_MAX)
|
|
oom_adj = OOM_ADJUST_MAX;
|
|
len = snprintf(buffer, sizeof(buffer), "%d\n", oom_adj);
|
|
return simple_read_from_buffer(buf, count, ppos, buffer, len);
|
|
}
|
|
|
|
static int __set_oom_adj(struct file *file, int oom_adj, bool legacy)
|
|
{
|
|
struct mm_struct *mm = NULL;
|
|
struct task_struct *task;
|
|
int err = 0;
|
|
|
|
task = get_proc_task(file_inode(file));
|
|
if (!task)
|
|
return -ESRCH;
|
|
|
|
mutex_lock(&oom_adj_mutex);
|
|
if (legacy) {
|
|
if (oom_adj < task->signal->oom_score_adj &&
|
|
!capable(CAP_SYS_RESOURCE)) {
|
|
err = -EACCES;
|
|
goto err_unlock;
|
|
}
|
|
/*
|
|
* /proc/pid/oom_adj is provided for legacy purposes, ask users to use
|
|
* /proc/pid/oom_score_adj instead.
|
|
*/
|
|
pr_warn_once("%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n",
|
|
current->comm, task_pid_nr(current), task_pid_nr(task),
|
|
task_pid_nr(task));
|
|
} else {
|
|
if ((short)oom_adj < task->signal->oom_score_adj_min &&
|
|
!capable(CAP_SYS_RESOURCE)) {
|
|
err = -EACCES;
|
|
goto err_unlock;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Make sure we will check other processes sharing the mm if this is
|
|
* not vfrok which wants its own oom_score_adj.
|
|
* pin the mm so it doesn't go away and get reused after task_unlock
|
|
*/
|
|
if (!task->vfork_done) {
|
|
struct task_struct *p = find_lock_task_mm(task);
|
|
|
|
if (p) {
|
|
if (test_bit(MMF_MULTIPROCESS, &p->mm->flags)) {
|
|
mm = p->mm;
|
|
mmgrab(mm);
|
|
}
|
|
task_unlock(p);
|
|
}
|
|
}
|
|
|
|
task->signal->oom_score_adj = oom_adj;
|
|
if (!legacy && has_capability_noaudit(current, CAP_SYS_RESOURCE))
|
|
task->signal->oom_score_adj_min = (short)oom_adj;
|
|
trace_oom_score_adj_update(task);
|
|
|
|
if (mm) {
|
|
struct task_struct *p;
|
|
|
|
rcu_read_lock();
|
|
for_each_process(p) {
|
|
if (same_thread_group(task, p))
|
|
continue;
|
|
|
|
/* do not touch kernel threads or the global init */
|
|
if (p->flags & PF_KTHREAD || is_global_init(p))
|
|
continue;
|
|
|
|
task_lock(p);
|
|
if (!p->vfork_done && process_shares_mm(p, mm)) {
|
|
p->signal->oom_score_adj = oom_adj;
|
|
if (!legacy && has_capability_noaudit(current, CAP_SYS_RESOURCE))
|
|
p->signal->oom_score_adj_min = (short)oom_adj;
|
|
}
|
|
task_unlock(p);
|
|
}
|
|
rcu_read_unlock();
|
|
mmdrop(mm);
|
|
}
|
|
err_unlock:
|
|
mutex_unlock(&oom_adj_mutex);
|
|
put_task_struct(task);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* /proc/pid/oom_adj exists solely for backwards compatibility with previous
|
|
* kernels. The effective policy is defined by oom_score_adj, which has a
|
|
* different scale: oom_adj grew exponentially and oom_score_adj grows linearly.
|
|
* Values written to oom_adj are simply mapped linearly to oom_score_adj.
|
|
* Processes that become oom disabled via oom_adj will still be oom disabled
|
|
* with this implementation.
|
|
*
|
|
* oom_adj cannot be removed since existing userspace binaries use it.
|
|
*/
|
|
static ssize_t oom_adj_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char buffer[PROC_NUMBUF];
|
|
int oom_adj;
|
|
int err;
|
|
|
|
memset(buffer, 0, sizeof(buffer));
|
|
if (count > sizeof(buffer) - 1)
|
|
count = sizeof(buffer) - 1;
|
|
if (copy_from_user(buffer, buf, count)) {
|
|
err = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
err = kstrtoint(strstrip(buffer), 0, &oom_adj);
|
|
if (err)
|
|
goto out;
|
|
if ((oom_adj < OOM_ADJUST_MIN || oom_adj > OOM_ADJUST_MAX) &&
|
|
oom_adj != OOM_DISABLE) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
|
|
* value is always attainable.
|
|
*/
|
|
if (oom_adj == OOM_ADJUST_MAX)
|
|
oom_adj = OOM_SCORE_ADJ_MAX;
|
|
else
|
|
oom_adj = (oom_adj * OOM_SCORE_ADJ_MAX) / -OOM_DISABLE;
|
|
|
|
err = __set_oom_adj(file, oom_adj, true);
|
|
out:
|
|
return err < 0 ? err : count;
|
|
}
|
|
|
|
static const struct file_operations proc_oom_adj_operations = {
|
|
.read = oom_adj_read,
|
|
.write = oom_adj_write,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static ssize_t oom_score_adj_read(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct task_struct *task = get_proc_task(file_inode(file));
|
|
char buffer[PROC_NUMBUF];
|
|
short oom_score_adj = OOM_SCORE_ADJ_MIN;
|
|
size_t len;
|
|
|
|
if (!task)
|
|
return -ESRCH;
|
|
oom_score_adj = task->signal->oom_score_adj;
|
|
put_task_struct(task);
|
|
len = snprintf(buffer, sizeof(buffer), "%hd\n", oom_score_adj);
|
|
return simple_read_from_buffer(buf, count, ppos, buffer, len);
|
|
}
|
|
|
|
static ssize_t oom_score_adj_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char buffer[PROC_NUMBUF];
|
|
int oom_score_adj;
|
|
int err;
|
|
|
|
memset(buffer, 0, sizeof(buffer));
|
|
if (count > sizeof(buffer) - 1)
|
|
count = sizeof(buffer) - 1;
|
|
if (copy_from_user(buffer, buf, count)) {
|
|
err = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
err = kstrtoint(strstrip(buffer), 0, &oom_score_adj);
|
|
if (err)
|
|
goto out;
|
|
if (oom_score_adj < OOM_SCORE_ADJ_MIN ||
|
|
oom_score_adj > OOM_SCORE_ADJ_MAX) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
err = __set_oom_adj(file, oom_score_adj, false);
|
|
out:
|
|
return err < 0 ? err : count;
|
|
}
|
|
|
|
static const struct file_operations proc_oom_score_adj_operations = {
|
|
.read = oom_score_adj_read,
|
|
.write = oom_score_adj_write,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
#ifdef CONFIG_AUDIT
|
|
#define TMPBUFLEN 11
|
|
static ssize_t proc_loginuid_read(struct file * file, char __user * buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct inode * inode = file_inode(file);
|
|
struct task_struct *task = get_proc_task(inode);
|
|
ssize_t length;
|
|
char tmpbuf[TMPBUFLEN];
|
|
|
|
if (!task)
|
|
return -ESRCH;
|
|
length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
|
|
from_kuid(file->f_cred->user_ns,
|
|
audit_get_loginuid(task)));
|
|
put_task_struct(task);
|
|
return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
|
|
}
|
|
|
|
static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct inode * inode = file_inode(file);
|
|
uid_t loginuid;
|
|
kuid_t kloginuid;
|
|
int rv;
|
|
|
|
/* Don't let kthreads write their own loginuid */
|
|
if (current->flags & PF_KTHREAD)
|
|
return -EPERM;
|
|
|
|
rcu_read_lock();
|
|
if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) {
|
|
rcu_read_unlock();
|
|
return -EPERM;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (*ppos != 0) {
|
|
/* No partial writes. */
|
|
return -EINVAL;
|
|
}
|
|
|
|
rv = kstrtou32_from_user(buf, count, 10, &loginuid);
|
|
if (rv < 0)
|
|
return rv;
|
|
|
|
/* is userspace tring to explicitly UNSET the loginuid? */
|
|
if (loginuid == AUDIT_UID_UNSET) {
|
|
kloginuid = INVALID_UID;
|
|
} else {
|
|
kloginuid = make_kuid(file->f_cred->user_ns, loginuid);
|
|
if (!uid_valid(kloginuid))
|
|
return -EINVAL;
|
|
}
|
|
|
|
rv = audit_set_loginuid(kloginuid);
|
|
if (rv < 0)
|
|
return rv;
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations proc_loginuid_operations = {
|
|
.read = proc_loginuid_read,
|
|
.write = proc_loginuid_write,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static ssize_t proc_sessionid_read(struct file * file, char __user * buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct inode * inode = file_inode(file);
|
|
struct task_struct *task = get_proc_task(inode);
|
|
ssize_t length;
|
|
char tmpbuf[TMPBUFLEN];
|
|
|
|
if (!task)
|
|
return -ESRCH;
|
|
length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
|
|
audit_get_sessionid(task));
|
|
put_task_struct(task);
|
|
return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
|
|
}
|
|
|
|
static const struct file_operations proc_sessionid_operations = {
|
|
.read = proc_sessionid_read,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
#endif
|
|
|
|
#ifdef CONFIG_FAULT_INJECTION
|
|
static ssize_t proc_fault_inject_read(struct file * file, char __user * buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct task_struct *task = get_proc_task(file_inode(file));
|
|
char buffer[PROC_NUMBUF];
|
|
size_t len;
|
|
int make_it_fail;
|
|
|
|
if (!task)
|
|
return -ESRCH;
|
|
make_it_fail = task->make_it_fail;
|
|
put_task_struct(task);
|
|
|
|
len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail);
|
|
|
|
return simple_read_from_buffer(buf, count, ppos, buffer, len);
|
|
}
|
|
|
|
static ssize_t proc_fault_inject_write(struct file * file,
|
|
const char __user * buf, size_t count, loff_t *ppos)
|
|
{
|
|
struct task_struct *task;
|
|
char buffer[PROC_NUMBUF];
|
|
int make_it_fail;
|
|
int rv;
|
|
|
|
if (!capable(CAP_SYS_RESOURCE))
|
|
return -EPERM;
|
|
memset(buffer, 0, sizeof(buffer));
|
|
if (count > sizeof(buffer) - 1)
|
|
count = sizeof(buffer) - 1;
|
|
if (copy_from_user(buffer, buf, count))
|
|
return -EFAULT;
|
|
rv = kstrtoint(strstrip(buffer), 0, &make_it_fail);
|
|
if (rv < 0)
|
|
return rv;
|
|
if (make_it_fail < 0 || make_it_fail > 1)
|
|
return -EINVAL;
|
|
|
|
task = get_proc_task(file_inode(file));
|
|
if (!task)
|
|
return -ESRCH;
|
|
task->make_it_fail = make_it_fail;
|
|
put_task_struct(task);
|
|
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations proc_fault_inject_operations = {
|
|
.read = proc_fault_inject_read,
|
|
.write = proc_fault_inject_write,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static ssize_t proc_fail_nth_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct task_struct *task;
|
|
int err;
|
|
unsigned int n;
|
|
|
|
err = kstrtouint_from_user(buf, count, 0, &n);
|
|
if (err)
|
|
return err;
|
|
|
|
task = get_proc_task(file_inode(file));
|
|
if (!task)
|
|
return -ESRCH;
|
|
task->fail_nth = n;
|
|
put_task_struct(task);
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t proc_fail_nth_read(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct task_struct *task;
|
|
char numbuf[PROC_NUMBUF];
|
|
ssize_t len;
|
|
|
|
task = get_proc_task(file_inode(file));
|
|
if (!task)
|
|
return -ESRCH;
|
|
len = snprintf(numbuf, sizeof(numbuf), "%u\n", task->fail_nth);
|
|
put_task_struct(task);
|
|
return simple_read_from_buffer(buf, count, ppos, numbuf, len);
|
|
}
|
|
|
|
static const struct file_operations proc_fail_nth_operations = {
|
|
.read = proc_fail_nth_read,
|
|
.write = proc_fail_nth_write,
|
|
};
|
|
#endif
|
|
|
|
|
|
#ifdef CONFIG_SCHED_DEBUG
|
|
/*
|
|
* Print out various scheduling related per-task fields:
|
|
*/
|
|
static int sched_show(struct seq_file *m, void *v)
|
|
{
|
|
struct inode *inode = m->private;
|
|
struct pid_namespace *ns = proc_pid_ns(inode->i_sb);
|
|
struct task_struct *p;
|
|
|
|
p = get_proc_task(inode);
|
|
if (!p)
|
|
return -ESRCH;
|
|
proc_sched_show_task(p, ns, m);
|
|
|
|
put_task_struct(p);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t
|
|
sched_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *offset)
|
|
{
|
|
struct inode *inode = file_inode(file);
|
|
struct task_struct *p;
|
|
|
|
p = get_proc_task(inode);
|
|
if (!p)
|
|
return -ESRCH;
|
|
proc_sched_set_task(p);
|
|
|
|
put_task_struct(p);
|
|
|
|
return count;
|
|
}
|
|
|
|
static int sched_open(struct inode *inode, struct file *filp)
|
|
{
|
|
return single_open(filp, sched_show, inode);
|
|
}
|
|
|
|
static const struct file_operations proc_pid_sched_operations = {
|
|
.open = sched_open,
|
|
.read = seq_read,
|
|
.write = sched_write,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
#endif
|
|
|
|
#ifdef CONFIG_SCHED_AUTOGROUP
|
|
/*
|
|
* Print out autogroup related information:
|
|
*/
|
|
static int sched_autogroup_show(struct seq_file *m, void *v)
|
|
{
|
|
struct inode *inode = m->private;
|
|
struct task_struct *p;
|
|
|
|
p = get_proc_task(inode);
|
|
if (!p)
|
|
return -ESRCH;
|
|
proc_sched_autogroup_show_task(p, m);
|
|
|
|
put_task_struct(p);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t
|
|
sched_autogroup_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *offset)
|
|
{
|
|
struct inode *inode = file_inode(file);
|
|
struct task_struct *p;
|
|
char buffer[PROC_NUMBUF];
|
|
int nice;
|
|
int err;
|
|
|
|
memset(buffer, 0, sizeof(buffer));
|
|
if (count > sizeof(buffer) - 1)
|
|
count = sizeof(buffer) - 1;
|
|
if (copy_from_user(buffer, buf, count))
|
|
return -EFAULT;
|
|
|
|
err = kstrtoint(strstrip(buffer), 0, &nice);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
p = get_proc_task(inode);
|
|
if (!p)
|
|
return -ESRCH;
|
|
|
|
err = proc_sched_autogroup_set_nice(p, nice);
|
|
if (err)
|
|
count = err;
|
|
|
|
put_task_struct(p);
|
|
|
|
return count;
|
|
}
|
|
|
|
static int sched_autogroup_open(struct inode *inode, struct file *filp)
|
|
{
|
|
int ret;
|
|
|
|
ret = single_open(filp, sched_autogroup_show, NULL);
|
|
if (!ret) {
|
|
struct seq_file *m = filp->private_data;
|
|
|
|
m->private = inode;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static const struct file_operations proc_pid_sched_autogroup_operations = {
|
|
.open = sched_autogroup_open,
|
|
.read = seq_read,
|
|
.write = sched_autogroup_write,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
#endif /* CONFIG_SCHED_AUTOGROUP */
|
|
|
|
#ifdef CONFIG_TIME_NS
|
|
static int timens_offsets_show(struct seq_file *m, void *v)
|
|
{
|
|
struct task_struct *p;
|
|
|
|
p = get_proc_task(file_inode(m->file));
|
|
if (!p)
|
|
return -ESRCH;
|
|
proc_timens_show_offsets(p, m);
|
|
|
|
put_task_struct(p);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t timens_offsets_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct inode *inode = file_inode(file);
|
|
struct proc_timens_offset offsets[2];
|
|
char *kbuf = NULL, *pos, *next_line;
|
|
struct task_struct *p;
|
|
int ret, noffsets;
|
|
|
|
/* Only allow < page size writes at the beginning of the file */
|
|
if ((*ppos != 0) || (count >= PAGE_SIZE))
|
|
return -EINVAL;
|
|
|
|
/* Slurp in the user data */
|
|
kbuf = memdup_user_nul(buf, count);
|
|
if (IS_ERR(kbuf))
|
|
return PTR_ERR(kbuf);
|
|
|
|
/* Parse the user data */
|
|
ret = -EINVAL;
|
|
noffsets = 0;
|
|
for (pos = kbuf; pos; pos = next_line) {
|
|
struct proc_timens_offset *off = &offsets[noffsets];
|
|
char clock[10];
|
|
int err;
|
|
|
|
/* Find the end of line and ensure we don't look past it */
|
|
next_line = strchr(pos, '\n');
|
|
if (next_line) {
|
|
*next_line = '\0';
|
|
next_line++;
|
|
if (*next_line == '\0')
|
|
next_line = NULL;
|
|
}
|
|
|
|
err = sscanf(pos, "%9s %lld %lu", clock,
|
|
&off->val.tv_sec, &off->val.tv_nsec);
|
|
if (err != 3 || off->val.tv_nsec >= NSEC_PER_SEC)
|
|
goto out;
|
|
|
|
clock[sizeof(clock) - 1] = 0;
|
|
if (strcmp(clock, "monotonic") == 0 ||
|
|
strcmp(clock, __stringify(CLOCK_MONOTONIC)) == 0)
|
|
off->clockid = CLOCK_MONOTONIC;
|
|
else if (strcmp(clock, "boottime") == 0 ||
|
|
strcmp(clock, __stringify(CLOCK_BOOTTIME)) == 0)
|
|
off->clockid = CLOCK_BOOTTIME;
|
|
else
|
|
goto out;
|
|
|
|
noffsets++;
|
|
if (noffsets == ARRAY_SIZE(offsets)) {
|
|
if (next_line)
|
|
count = next_line - kbuf;
|
|
break;
|
|
}
|
|
}
|
|
|
|
ret = -ESRCH;
|
|
p = get_proc_task(inode);
|
|
if (!p)
|
|
goto out;
|
|
ret = proc_timens_set_offset(file, p, offsets, noffsets);
|
|
put_task_struct(p);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = count;
|
|
out:
|
|
kfree(kbuf);
|
|
return ret;
|
|
}
|
|
|
|
static int timens_offsets_open(struct inode *inode, struct file *filp)
|
|
{
|
|
return single_open(filp, timens_offsets_show, inode);
|
|
}
|
|
|
|
static const struct file_operations proc_timens_offsets_operations = {
|
|
.open = timens_offsets_open,
|
|
.read = seq_read,
|
|
.write = timens_offsets_write,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
#endif /* CONFIG_TIME_NS */
|
|
|
|
static ssize_t comm_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *offset)
|
|
{
|
|
struct inode *inode = file_inode(file);
|
|
struct task_struct *p;
|
|
char buffer[TASK_COMM_LEN];
|
|
const size_t maxlen = sizeof(buffer) - 1;
|
|
|
|
memset(buffer, 0, sizeof(buffer));
|
|
if (copy_from_user(buffer, buf, count > maxlen ? maxlen : count))
|
|
return -EFAULT;
|
|
|
|
p = get_proc_task(inode);
|
|
if (!p)
|
|
return -ESRCH;
|
|
|
|
if (same_thread_group(current, p)) {
|
|
set_task_comm(p, buffer);
|
|
proc_comm_connector(p);
|
|
}
|
|
else
|
|
count = -EINVAL;
|
|
|
|
put_task_struct(p);
|
|
|
|
return count;
|
|
}
|
|
|
|
static int comm_show(struct seq_file *m, void *v)
|
|
{
|
|
struct inode *inode = m->private;
|
|
struct task_struct *p;
|
|
|
|
p = get_proc_task(inode);
|
|
if (!p)
|
|
return -ESRCH;
|
|
|
|
proc_task_name(m, p, false);
|
|
seq_putc(m, '\n');
|
|
|
|
put_task_struct(p);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int comm_open(struct inode *inode, struct file *filp)
|
|
{
|
|
return single_open(filp, comm_show, inode);
|
|
}
|
|
|
|
static const struct file_operations proc_pid_set_comm_operations = {
|
|
.open = comm_open,
|
|
.read = seq_read,
|
|
.write = comm_write,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static int proc_exe_link(struct dentry *dentry, struct path *exe_path)
|
|
{
|
|
struct task_struct *task;
|
|
struct file *exe_file;
|
|
|
|
task = get_proc_task(d_inode(dentry));
|
|
if (!task)
|
|
return -ENOENT;
|
|
exe_file = get_task_exe_file(task);
|
|
put_task_struct(task);
|
|
if (exe_file) {
|
|
*exe_path = exe_file->f_path;
|
|
path_get(&exe_file->f_path);
|
|
fput(exe_file);
|
|
return 0;
|
|
} else
|
|
return -ENOENT;
|
|
}
|
|
|
|
static const char *proc_pid_get_link(struct dentry *dentry,
|
|
struct inode *inode,
|
|
struct delayed_call *done)
|
|
{
|
|
struct path path;
|
|
int error = -EACCES;
|
|
|
|
if (!dentry)
|
|
return ERR_PTR(-ECHILD);
|
|
|
|
/* Are we allowed to snoop on the tasks file descriptors? */
|
|
if (!proc_fd_access_allowed(inode))
|
|
goto out;
|
|
|
|
error = PROC_I(inode)->op.proc_get_link(dentry, &path);
|
|
if (error)
|
|
goto out;
|
|
|
|
error = nd_jump_link(&path);
|
|
out:
|
|
return ERR_PTR(error);
|
|
}
|
|
|
|
static int do_proc_readlink(struct path *path, char __user *buffer, int buflen)
|
|
{
|
|
char *tmp = kmalloc(PATH_MAX, GFP_KERNEL);
|
|
char *pathname;
|
|
int len;
|
|
|
|
if (!tmp)
|
|
return -ENOMEM;
|
|
|
|
pathname = d_path(path, tmp, PATH_MAX);
|
|
len = PTR_ERR(pathname);
|
|
if (IS_ERR(pathname))
|
|
goto out;
|
|
len = tmp + PATH_MAX - 1 - pathname;
|
|
|
|
if (len > buflen)
|
|
len = buflen;
|
|
if (copy_to_user(buffer, pathname, len))
|
|
len = -EFAULT;
|
|
out:
|
|
kfree(tmp);
|
|
return len;
|
|
}
|
|
|
|
static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen)
|
|
{
|
|
int error = -EACCES;
|
|
struct inode *inode = d_inode(dentry);
|
|
struct path path;
|
|
|
|
/* Are we allowed to snoop on the tasks file descriptors? */
|
|
if (!proc_fd_access_allowed(inode))
|
|
goto out;
|
|
|
|
error = PROC_I(inode)->op.proc_get_link(dentry, &path);
|
|
if (error)
|
|
goto out;
|
|
|
|
error = do_proc_readlink(&path, buffer, buflen);
|
|
path_put(&path);
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
const struct inode_operations proc_pid_link_inode_operations = {
|
|
.readlink = proc_pid_readlink,
|
|
.get_link = proc_pid_get_link,
|
|
.setattr = proc_setattr,
|
|
};
|
|
|
|
|
|
/* building an inode */
|
|
|
|
void task_dump_owner(struct task_struct *task, umode_t mode,
|
|
kuid_t *ruid, kgid_t *rgid)
|
|
{
|
|
/* Depending on the state of dumpable compute who should own a
|
|
* proc file for a task.
|
|
*/
|
|
const struct cred *cred;
|
|
kuid_t uid;
|
|
kgid_t gid;
|
|
|
|
if (unlikely(task->flags & PF_KTHREAD)) {
|
|
*ruid = GLOBAL_ROOT_UID;
|
|
*rgid = GLOBAL_ROOT_GID;
|
|
return;
|
|
}
|
|
|
|
/* Default to the tasks effective ownership */
|
|
rcu_read_lock();
|
|
cred = __task_cred(task);
|
|
uid = cred->euid;
|
|
gid = cred->egid;
|
|
rcu_read_unlock();
|
|
|
|
/*
|
|
* Before the /proc/pid/status file was created the only way to read
|
|
* the effective uid of a /process was to stat /proc/pid. Reading
|
|
* /proc/pid/status is slow enough that procps and other packages
|
|
* kept stating /proc/pid. To keep the rules in /proc simple I have
|
|
* made this apply to all per process world readable and executable
|
|
* directories.
|
|
*/
|
|
if (mode != (S_IFDIR|S_IRUGO|S_IXUGO)) {
|
|
struct mm_struct *mm;
|
|
task_lock(task);
|
|
mm = task->mm;
|
|
/* Make non-dumpable tasks owned by some root */
|
|
if (mm) {
|
|
if (get_dumpable(mm) != SUID_DUMP_USER) {
|
|
struct user_namespace *user_ns = mm->user_ns;
|
|
|
|
uid = make_kuid(user_ns, 0);
|
|
if (!uid_valid(uid))
|
|
uid = GLOBAL_ROOT_UID;
|
|
|
|
gid = make_kgid(user_ns, 0);
|
|
if (!gid_valid(gid))
|
|
gid = GLOBAL_ROOT_GID;
|
|
}
|
|
} else {
|
|
uid = GLOBAL_ROOT_UID;
|
|
gid = GLOBAL_ROOT_GID;
|
|
}
|
|
task_unlock(task);
|
|
}
|
|
*ruid = uid;
|
|
*rgid = gid;
|
|
}
|
|
|
|
void proc_pid_evict_inode(struct proc_inode *ei)
|
|
{
|
|
struct pid *pid = ei->pid;
|
|
|
|
if (S_ISDIR(ei->vfs_inode.i_mode)) {
|
|
spin_lock(&pid->lock);
|
|
hlist_del_init_rcu(&ei->sibling_inodes);
|
|
spin_unlock(&pid->lock);
|
|
}
|
|
|
|
put_pid(pid);
|
|
}
|
|
|
|
struct inode *proc_pid_make_inode(struct super_block *sb,
|
|
struct task_struct *task, umode_t mode)
|
|
{
|
|
struct inode * inode;
|
|
struct proc_inode *ei;
|
|
struct pid *pid;
|
|
|
|
/* We need a new inode */
|
|
|
|
inode = new_inode(sb);
|
|
if (!inode)
|
|
goto out;
|
|
|
|
/* Common stuff */
|
|
ei = PROC_I(inode);
|
|
inode->i_mode = mode;
|
|
inode->i_ino = get_next_ino();
|
|
inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
|
|
inode->i_op = &proc_def_inode_operations;
|
|
|
|
/*
|
|
* grab the reference to task.
|
|
*/
|
|
pid = get_task_pid(task, PIDTYPE_PID);
|
|
if (!pid)
|
|
goto out_unlock;
|
|
|
|
/* Let the pid remember us for quick removal */
|
|
ei->pid = pid;
|
|
|
|
task_dump_owner(task, 0, &inode->i_uid, &inode->i_gid);
|
|
security_task_to_inode(task, inode);
|
|
|
|
out:
|
|
return inode;
|
|
|
|
out_unlock:
|
|
iput(inode);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Generating an inode and adding it into @pid->inodes, so that task will
|
|
* invalidate inode's dentry before being released.
|
|
*
|
|
* This helper is used for creating dir-type entries under '/proc' and
|
|
* '/proc/<tgid>/task'. Other entries(eg. fd, stat) under '/proc/<tgid>'
|
|
* can be released by invalidating '/proc/<tgid>' dentry.
|
|
* In theory, dentries under '/proc/<tgid>/task' can also be released by
|
|
* invalidating '/proc/<tgid>' dentry, we reserve it to handle single
|
|
* thread exiting situation: Any one of threads should invalidate its
|
|
* '/proc/<tgid>/task/<pid>' dentry before released.
|
|
*/
|
|
static struct inode *proc_pid_make_base_inode(struct super_block *sb,
|
|
struct task_struct *task, umode_t mode)
|
|
{
|
|
struct inode *inode;
|
|
struct proc_inode *ei;
|
|
struct pid *pid;
|
|
|
|
inode = proc_pid_make_inode(sb, task, mode);
|
|
if (!inode)
|
|
return NULL;
|
|
|
|
/* Let proc_flush_pid find this directory inode */
|
|
ei = PROC_I(inode);
|
|
pid = ei->pid;
|
|
spin_lock(&pid->lock);
|
|
hlist_add_head_rcu(&ei->sibling_inodes, &pid->inodes);
|
|
spin_unlock(&pid->lock);
|
|
|
|
return inode;
|
|
}
|
|
|
|
int pid_getattr(struct user_namespace *mnt_userns, const struct path *path,
|
|
struct kstat *stat, u32 request_mask, unsigned int query_flags)
|
|
{
|
|
struct inode *inode = d_inode(path->dentry);
|
|
struct proc_fs_info *fs_info = proc_sb_info(inode->i_sb);
|
|
struct task_struct *task;
|
|
|
|
generic_fillattr(&init_user_ns, inode, stat);
|
|
|
|
stat->uid = GLOBAL_ROOT_UID;
|
|
stat->gid = GLOBAL_ROOT_GID;
|
|
rcu_read_lock();
|
|
task = pid_task(proc_pid(inode), PIDTYPE_PID);
|
|
if (task) {
|
|
if (!has_pid_permissions(fs_info, task, HIDEPID_INVISIBLE)) {
|
|
rcu_read_unlock();
|
|
/*
|
|
* This doesn't prevent learning whether PID exists,
|
|
* it only makes getattr() consistent with readdir().
|
|
*/
|
|
return -ENOENT;
|
|
}
|
|
task_dump_owner(task, inode->i_mode, &stat->uid, &stat->gid);
|
|
}
|
|
rcu_read_unlock();
|
|
return 0;
|
|
}
|
|
|
|
/* dentry stuff */
|
|
|
|
/*
|
|
* Set <pid>/... inode ownership (can change due to setuid(), etc.)
|
|
*/
|
|
void pid_update_inode(struct task_struct *task, struct inode *inode)
|
|
{
|
|
task_dump_owner(task, inode->i_mode, &inode->i_uid, &inode->i_gid);
|
|
|
|
inode->i_mode &= ~(S_ISUID | S_ISGID);
|
|
security_task_to_inode(task, inode);
|
|
}
|
|
|
|
/*
|
|
* Rewrite the inode's ownerships here because the owning task may have
|
|
* performed a setuid(), etc.
|
|
*
|
|
*/
|
|
static int pid_revalidate(struct dentry *dentry, unsigned int flags)
|
|
{
|
|
struct inode *inode;
|
|
struct task_struct *task;
|
|
int ret = 0;
|
|
|
|
rcu_read_lock();
|
|
inode = d_inode_rcu(dentry);
|
|
if (!inode)
|
|
goto out;
|
|
task = pid_task(proc_pid(inode), PIDTYPE_PID);
|
|
|
|
if (task) {
|
|
pid_update_inode(task, inode);
|
|
ret = 1;
|
|
}
|
|
out:
|
|
rcu_read_unlock();
|
|
return ret;
|
|
}
|
|
|
|
static inline bool proc_inode_is_dead(struct inode *inode)
|
|
{
|
|
return !proc_pid(inode)->tasks[PIDTYPE_PID].first;
|
|
}
|
|
|
|
int pid_delete_dentry(const struct dentry *dentry)
|
|
{
|
|
/* Is the task we represent dead?
|
|
* If so, then don't put the dentry on the lru list,
|
|
* kill it immediately.
|
|
*/
|
|
return proc_inode_is_dead(d_inode(dentry));
|
|
}
|
|
|
|
const struct dentry_operations pid_dentry_operations =
|
|
{
|
|
.d_revalidate = pid_revalidate,
|
|
.d_delete = pid_delete_dentry,
|
|
};
|
|
|
|
/* Lookups */
|
|
|
|
/*
|
|
* Fill a directory entry.
|
|
*
|
|
* If possible create the dcache entry and derive our inode number and
|
|
* file type from dcache entry.
|
|
*
|
|
* Since all of the proc inode numbers are dynamically generated, the inode
|
|
* numbers do not exist until the inode is cache. This means creating
|
|
* the dcache entry in readdir is necessary to keep the inode numbers
|
|
* reported by readdir in sync with the inode numbers reported
|
|
* by stat.
|
|
*/
|
|
bool proc_fill_cache(struct file *file, struct dir_context *ctx,
|
|
const char *name, unsigned int len,
|
|
instantiate_t instantiate, struct task_struct *task, const void *ptr)
|
|
{
|
|
struct dentry *child, *dir = file->f_path.dentry;
|
|
struct qstr qname = QSTR_INIT(name, len);
|
|
struct inode *inode;
|
|
unsigned type = DT_UNKNOWN;
|
|
ino_t ino = 1;
|
|
|
|
child = d_hash_and_lookup(dir, &qname);
|
|
if (!child) {
|
|
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
|
|
child = d_alloc_parallel(dir, &qname, &wq);
|
|
if (IS_ERR(child))
|
|
goto end_instantiate;
|
|
if (d_in_lookup(child)) {
|
|
struct dentry *res;
|
|
res = instantiate(child, task, ptr);
|
|
d_lookup_done(child);
|
|
if (unlikely(res)) {
|
|
dput(child);
|
|
child = res;
|
|
if (IS_ERR(child))
|
|
goto end_instantiate;
|
|
}
|
|
}
|
|
}
|
|
inode = d_inode(child);
|
|
ino = inode->i_ino;
|
|
type = inode->i_mode >> 12;
|
|
dput(child);
|
|
end_instantiate:
|
|
return dir_emit(ctx, name, len, ino, type);
|
|
}
|
|
|
|
/*
|
|
* dname_to_vma_addr - maps a dentry name into two unsigned longs
|
|
* which represent vma start and end addresses.
|
|
*/
|
|
static int dname_to_vma_addr(struct dentry *dentry,
|
|
unsigned long *start, unsigned long *end)
|
|
{
|
|
const char *str = dentry->d_name.name;
|
|
unsigned long long sval, eval;
|
|
unsigned int len;
|
|
|
|
if (str[0] == '0' && str[1] != '-')
|
|
return -EINVAL;
|
|
len = _parse_integer(str, 16, &sval);
|
|
if (len & KSTRTOX_OVERFLOW)
|
|
return -EINVAL;
|
|
if (sval != (unsigned long)sval)
|
|
return -EINVAL;
|
|
str += len;
|
|
|
|
if (*str != '-')
|
|
return -EINVAL;
|
|
str++;
|
|
|
|
if (str[0] == '0' && str[1])
|
|
return -EINVAL;
|
|
len = _parse_integer(str, 16, &eval);
|
|
if (len & KSTRTOX_OVERFLOW)
|
|
return -EINVAL;
|
|
if (eval != (unsigned long)eval)
|
|
return -EINVAL;
|
|
str += len;
|
|
|
|
if (*str != '\0')
|
|
return -EINVAL;
|
|
|
|
*start = sval;
|
|
*end = eval;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int map_files_d_revalidate(struct dentry *dentry, unsigned int flags)
|
|
{
|
|
unsigned long vm_start, vm_end;
|
|
bool exact_vma_exists = false;
|
|
struct mm_struct *mm = NULL;
|
|
struct task_struct *task;
|
|
struct inode *inode;
|
|
int status = 0;
|
|
|
|
if (flags & LOOKUP_RCU)
|
|
return -ECHILD;
|
|
|
|
inode = d_inode(dentry);
|
|
task = get_proc_task(inode);
|
|
if (!task)
|
|
goto out_notask;
|
|
|
|
mm = mm_access(task, PTRACE_MODE_READ_FSCREDS);
|
|
if (IS_ERR_OR_NULL(mm))
|
|
goto out;
|
|
|
|
if (!dname_to_vma_addr(dentry, &vm_start, &vm_end)) {
|
|
status = mmap_read_lock_killable(mm);
|
|
if (!status) {
|
|
exact_vma_exists = !!find_exact_vma(mm, vm_start,
|
|
vm_end);
|
|
mmap_read_unlock(mm);
|
|
}
|
|
}
|
|
|
|
mmput(mm);
|
|
|
|
if (exact_vma_exists) {
|
|
task_dump_owner(task, 0, &inode->i_uid, &inode->i_gid);
|
|
|
|
security_task_to_inode(task, inode);
|
|
status = 1;
|
|
}
|
|
|
|
out:
|
|
put_task_struct(task);
|
|
|
|
out_notask:
|
|
return status;
|
|
}
|
|
|
|
static const struct dentry_operations tid_map_files_dentry_operations = {
|
|
.d_revalidate = map_files_d_revalidate,
|
|
.d_delete = pid_delete_dentry,
|
|
};
|
|
|
|
static int map_files_get_link(struct dentry *dentry, struct path *path)
|
|
{
|
|
unsigned long vm_start, vm_end;
|
|
struct vm_area_struct *vma;
|
|
struct task_struct *task;
|
|
struct mm_struct *mm;
|
|
int rc;
|
|
|
|
rc = -ENOENT;
|
|
task = get_proc_task(d_inode(dentry));
|
|
if (!task)
|
|
goto out;
|
|
|
|
mm = get_task_mm(task);
|
|
put_task_struct(task);
|
|
if (!mm)
|
|
goto out;
|
|
|
|
rc = dname_to_vma_addr(dentry, &vm_start, &vm_end);
|
|
if (rc)
|
|
goto out_mmput;
|
|
|
|
rc = mmap_read_lock_killable(mm);
|
|
if (rc)
|
|
goto out_mmput;
|
|
|
|
rc = -ENOENT;
|
|
vma = find_exact_vma(mm, vm_start, vm_end);
|
|
if (vma && vma->vm_file) {
|
|
*path = vma->vm_file->f_path;
|
|
path_get(path);
|
|
rc = 0;
|
|
}
|
|
mmap_read_unlock(mm);
|
|
|
|
out_mmput:
|
|
mmput(mm);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
struct map_files_info {
|
|
unsigned long start;
|
|
unsigned long end;
|
|
fmode_t mode;
|
|
};
|
|
|
|
/*
|
|
* Only allow CAP_SYS_ADMIN and CAP_CHECKPOINT_RESTORE to follow the links, due
|
|
* to concerns about how the symlinks may be used to bypass permissions on
|
|
* ancestor directories in the path to the file in question.
|
|
*/
|
|
static const char *
|
|
proc_map_files_get_link(struct dentry *dentry,
|
|
struct inode *inode,
|
|
struct delayed_call *done)
|
|
{
|
|
if (!checkpoint_restore_ns_capable(&init_user_ns))
|
|
return ERR_PTR(-EPERM);
|
|
|
|
return proc_pid_get_link(dentry, inode, done);
|
|
}
|
|
|
|
/*
|
|
* Identical to proc_pid_link_inode_operations except for get_link()
|
|
*/
|
|
static const struct inode_operations proc_map_files_link_inode_operations = {
|
|
.readlink = proc_pid_readlink,
|
|
.get_link = proc_map_files_get_link,
|
|
.setattr = proc_setattr,
|
|
};
|
|
|
|
static struct dentry *
|
|
proc_map_files_instantiate(struct dentry *dentry,
|
|
struct task_struct *task, const void *ptr)
|
|
{
|
|
fmode_t mode = (fmode_t)(unsigned long)ptr;
|
|
struct proc_inode *ei;
|
|
struct inode *inode;
|
|
|
|
inode = proc_pid_make_inode(dentry->d_sb, task, S_IFLNK |
|
|
((mode & FMODE_READ ) ? S_IRUSR : 0) |
|
|
((mode & FMODE_WRITE) ? S_IWUSR : 0));
|
|
if (!inode)
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
ei = PROC_I(inode);
|
|
ei->op.proc_get_link = map_files_get_link;
|
|
|
|
inode->i_op = &proc_map_files_link_inode_operations;
|
|
inode->i_size = 64;
|
|
|
|
d_set_d_op(dentry, &tid_map_files_dentry_operations);
|
|
return d_splice_alias(inode, dentry);
|
|
}
|
|
|
|
static struct dentry *proc_map_files_lookup(struct inode *dir,
|
|
struct dentry *dentry, unsigned int flags)
|
|
{
|
|
unsigned long vm_start, vm_end;
|
|
struct vm_area_struct *vma;
|
|
struct task_struct *task;
|
|
struct dentry *result;
|
|
struct mm_struct *mm;
|
|
|
|
result = ERR_PTR(-ENOENT);
|
|
task = get_proc_task(dir);
|
|
if (!task)
|
|
goto out;
|
|
|
|
result = ERR_PTR(-EACCES);
|
|
if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS))
|
|
goto out_put_task;
|
|
|
|
result = ERR_PTR(-ENOENT);
|
|
if (dname_to_vma_addr(dentry, &vm_start, &vm_end))
|
|
goto out_put_task;
|
|
|
|
mm = get_task_mm(task);
|
|
if (!mm)
|
|
goto out_put_task;
|
|
|
|
result = ERR_PTR(-EINTR);
|
|
if (mmap_read_lock_killable(mm))
|
|
goto out_put_mm;
|
|
|
|
result = ERR_PTR(-ENOENT);
|
|
vma = find_exact_vma(mm, vm_start, vm_end);
|
|
if (!vma)
|
|
goto out_no_vma;
|
|
|
|
if (vma->vm_file)
|
|
result = proc_map_files_instantiate(dentry, task,
|
|
(void *)(unsigned long)vma->vm_file->f_mode);
|
|
|
|
out_no_vma:
|
|
mmap_read_unlock(mm);
|
|
out_put_mm:
|
|
mmput(mm);
|
|
out_put_task:
|
|
put_task_struct(task);
|
|
out:
|
|
return result;
|
|
}
|
|
|
|
static const struct inode_operations proc_map_files_inode_operations = {
|
|
.lookup = proc_map_files_lookup,
|
|
.permission = proc_fd_permission,
|
|
.setattr = proc_setattr,
|
|
};
|
|
|
|
static int
|
|
proc_map_files_readdir(struct file *file, struct dir_context *ctx)
|
|
{
|
|
struct vm_area_struct *vma;
|
|
struct task_struct *task;
|
|
struct mm_struct *mm;
|
|
unsigned long nr_files, pos, i;
|
|
GENRADIX(struct map_files_info) fa;
|
|
struct map_files_info *p;
|
|
int ret;
|
|
|
|
genradix_init(&fa);
|
|
|
|
ret = -ENOENT;
|
|
task = get_proc_task(file_inode(file));
|
|
if (!task)
|
|
goto out;
|
|
|
|
ret = -EACCES;
|
|
if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS))
|
|
goto out_put_task;
|
|
|
|
ret = 0;
|
|
if (!dir_emit_dots(file, ctx))
|
|
goto out_put_task;
|
|
|
|
mm = get_task_mm(task);
|
|
if (!mm)
|
|
goto out_put_task;
|
|
|
|
ret = mmap_read_lock_killable(mm);
|
|
if (ret) {
|
|
mmput(mm);
|
|
goto out_put_task;
|
|
}
|
|
|
|
nr_files = 0;
|
|
|
|
/*
|
|
* We need two passes here:
|
|
*
|
|
* 1) Collect vmas of mapped files with mmap_lock taken
|
|
* 2) Release mmap_lock and instantiate entries
|
|
*
|
|
* otherwise we get lockdep complained, since filldir()
|
|
* routine might require mmap_lock taken in might_fault().
|
|
*/
|
|
|
|
for (vma = mm->mmap, pos = 2; vma; vma = vma->vm_next) {
|
|
if (!vma->vm_file)
|
|
continue;
|
|
if (++pos <= ctx->pos)
|
|
continue;
|
|
|
|
p = genradix_ptr_alloc(&fa, nr_files++, GFP_KERNEL);
|
|
if (!p) {
|
|
ret = -ENOMEM;
|
|
mmap_read_unlock(mm);
|
|
mmput(mm);
|
|
goto out_put_task;
|
|
}
|
|
|
|
p->start = vma->vm_start;
|
|
p->end = vma->vm_end;
|
|
p->mode = vma->vm_file->f_mode;
|
|
}
|
|
mmap_read_unlock(mm);
|
|
mmput(mm);
|
|
|
|
for (i = 0; i < nr_files; i++) {
|
|
char buf[4 * sizeof(long) + 2]; /* max: %lx-%lx\0 */
|
|
unsigned int len;
|
|
|
|
p = genradix_ptr(&fa, i);
|
|
len = snprintf(buf, sizeof(buf), "%lx-%lx", p->start, p->end);
|
|
if (!proc_fill_cache(file, ctx,
|
|
buf, len,
|
|
proc_map_files_instantiate,
|
|
task,
|
|
(void *)(unsigned long)p->mode))
|
|
break;
|
|
ctx->pos++;
|
|
}
|
|
|
|
out_put_task:
|
|
put_task_struct(task);
|
|
out:
|
|
genradix_free(&fa);
|
|
return ret;
|
|
}
|
|
|
|
static const struct file_operations proc_map_files_operations = {
|
|
.read = generic_read_dir,
|
|
.iterate_shared = proc_map_files_readdir,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
#if defined(CONFIG_CHECKPOINT_RESTORE) && defined(CONFIG_POSIX_TIMERS)
|
|
struct timers_private {
|
|
struct pid *pid;
|
|
struct task_struct *task;
|
|
struct sighand_struct *sighand;
|
|
struct pid_namespace *ns;
|
|
unsigned long flags;
|
|
};
|
|
|
|
static void *timers_start(struct seq_file *m, loff_t *pos)
|
|
{
|
|
struct timers_private *tp = m->private;
|
|
|
|
tp->task = get_pid_task(tp->pid, PIDTYPE_PID);
|
|
if (!tp->task)
|
|
return ERR_PTR(-ESRCH);
|
|
|
|
tp->sighand = lock_task_sighand(tp->task, &tp->flags);
|
|
if (!tp->sighand)
|
|
return ERR_PTR(-ESRCH);
|
|
|
|
return seq_list_start(&tp->task->signal->posix_timers, *pos);
|
|
}
|
|
|
|
static void *timers_next(struct seq_file *m, void *v, loff_t *pos)
|
|
{
|
|
struct timers_private *tp = m->private;
|
|
return seq_list_next(v, &tp->task->signal->posix_timers, pos);
|
|
}
|
|
|
|
static void timers_stop(struct seq_file *m, void *v)
|
|
{
|
|
struct timers_private *tp = m->private;
|
|
|
|
if (tp->sighand) {
|
|
unlock_task_sighand(tp->task, &tp->flags);
|
|
tp->sighand = NULL;
|
|
}
|
|
|
|
if (tp->task) {
|
|
put_task_struct(tp->task);
|
|
tp->task = NULL;
|
|
}
|
|
}
|
|
|
|
static int show_timer(struct seq_file *m, void *v)
|
|
{
|
|
struct k_itimer *timer;
|
|
struct timers_private *tp = m->private;
|
|
int notify;
|
|
static const char * const nstr[] = {
|
|
[SIGEV_SIGNAL] = "signal",
|
|
[SIGEV_NONE] = "none",
|
|
[SIGEV_THREAD] = "thread",
|
|
};
|
|
|
|
timer = list_entry((struct list_head *)v, struct k_itimer, list);
|
|
notify = timer->it_sigev_notify;
|
|
|
|
seq_printf(m, "ID: %d\n", timer->it_id);
|
|
seq_printf(m, "signal: %d/%px\n",
|
|
timer->sigq->info.si_signo,
|
|
timer->sigq->info.si_value.sival_ptr);
|
|
seq_printf(m, "notify: %s/%s.%d\n",
|
|
nstr[notify & ~SIGEV_THREAD_ID],
|
|
(notify & SIGEV_THREAD_ID) ? "tid" : "pid",
|
|
pid_nr_ns(timer->it_pid, tp->ns));
|
|
seq_printf(m, "ClockID: %d\n", timer->it_clock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations proc_timers_seq_ops = {
|
|
.start = timers_start,
|
|
.next = timers_next,
|
|
.stop = timers_stop,
|
|
.show = show_timer,
|
|
};
|
|
|
|
static int proc_timers_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct timers_private *tp;
|
|
|
|
tp = __seq_open_private(file, &proc_timers_seq_ops,
|
|
sizeof(struct timers_private));
|
|
if (!tp)
|
|
return -ENOMEM;
|
|
|
|
tp->pid = proc_pid(inode);
|
|
tp->ns = proc_pid_ns(inode->i_sb);
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations proc_timers_operations = {
|
|
.open = proc_timers_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release_private,
|
|
};
|
|
#endif
|
|
|
|
static ssize_t timerslack_ns_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *offset)
|
|
{
|
|
struct inode *inode = file_inode(file);
|
|
struct task_struct *p;
|
|
u64 slack_ns;
|
|
int err;
|
|
|
|
err = kstrtoull_from_user(buf, count, 10, &slack_ns);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
p = get_proc_task(inode);
|
|
if (!p)
|
|
return -ESRCH;
|
|
|
|
if (p != current) {
|
|
rcu_read_lock();
|
|
if (!ns_capable(__task_cred(p)->user_ns, CAP_SYS_NICE)) {
|
|
rcu_read_unlock();
|
|
count = -EPERM;
|
|
goto out;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
err = security_task_setscheduler(p);
|
|
if (err) {
|
|
count = err;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
task_lock(p);
|
|
if (slack_ns == 0)
|
|
p->timer_slack_ns = p->default_timer_slack_ns;
|
|
else
|
|
p->timer_slack_ns = slack_ns;
|
|
task_unlock(p);
|
|
|
|
out:
|
|
put_task_struct(p);
|
|
|
|
return count;
|
|
}
|
|
|
|
static int timerslack_ns_show(struct seq_file *m, void *v)
|
|
{
|
|
struct inode *inode = m->private;
|
|
struct task_struct *p;
|
|
int err = 0;
|
|
|
|
p = get_proc_task(inode);
|
|
if (!p)
|
|
return -ESRCH;
|
|
|
|
if (p != current) {
|
|
rcu_read_lock();
|
|
if (!ns_capable(__task_cred(p)->user_ns, CAP_SYS_NICE)) {
|
|
rcu_read_unlock();
|
|
err = -EPERM;
|
|
goto out;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
err = security_task_getscheduler(p);
|
|
if (err)
|
|
goto out;
|
|
}
|
|
|
|
task_lock(p);
|
|
seq_printf(m, "%llu\n", p->timer_slack_ns);
|
|
task_unlock(p);
|
|
|
|
out:
|
|
put_task_struct(p);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int timerslack_ns_open(struct inode *inode, struct file *filp)
|
|
{
|
|
return single_open(filp, timerslack_ns_show, inode);
|
|
}
|
|
|
|
static const struct file_operations proc_pid_set_timerslack_ns_operations = {
|
|
.open = timerslack_ns_open,
|
|
.read = seq_read,
|
|
.write = timerslack_ns_write,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static struct dentry *proc_pident_instantiate(struct dentry *dentry,
|
|
struct task_struct *task, const void *ptr)
|
|
{
|
|
const struct pid_entry *p = ptr;
|
|
struct inode *inode;
|
|
struct proc_inode *ei;
|
|
|
|
inode = proc_pid_make_inode(dentry->d_sb, task, p->mode);
|
|
if (!inode)
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
ei = PROC_I(inode);
|
|
if (S_ISDIR(inode->i_mode))
|
|
set_nlink(inode, 2); /* Use getattr to fix if necessary */
|
|
if (p->iop)
|
|
inode->i_op = p->iop;
|
|
if (p->fop)
|
|
inode->i_fop = p->fop;
|
|
ei->op = p->op;
|
|
pid_update_inode(task, inode);
|
|
d_set_d_op(dentry, &pid_dentry_operations);
|
|
return d_splice_alias(inode, dentry);
|
|
}
|
|
|
|
static struct dentry *proc_pident_lookup(struct inode *dir,
|
|
struct dentry *dentry,
|
|
const struct pid_entry *p,
|
|
const struct pid_entry *end)
|
|
{
|
|
struct task_struct *task = get_proc_task(dir);
|
|
struct dentry *res = ERR_PTR(-ENOENT);
|
|
|
|
if (!task)
|
|
goto out_no_task;
|
|
|
|
/*
|
|
* Yes, it does not scale. And it should not. Don't add
|
|
* new entries into /proc/<tgid>/ without very good reasons.
|
|
*/
|
|
for (; p < end; p++) {
|
|
if (p->len != dentry->d_name.len)
|
|
continue;
|
|
if (!memcmp(dentry->d_name.name, p->name, p->len)) {
|
|
res = proc_pident_instantiate(dentry, task, p);
|
|
break;
|
|
}
|
|
}
|
|
put_task_struct(task);
|
|
out_no_task:
|
|
return res;
|
|
}
|
|
|
|
static int proc_pident_readdir(struct file *file, struct dir_context *ctx,
|
|
const struct pid_entry *ents, unsigned int nents)
|
|
{
|
|
struct task_struct *task = get_proc_task(file_inode(file));
|
|
const struct pid_entry *p;
|
|
|
|
if (!task)
|
|
return -ENOENT;
|
|
|
|
if (!dir_emit_dots(file, ctx))
|
|
goto out;
|
|
|
|
if (ctx->pos >= nents + 2)
|
|
goto out;
|
|
|
|
for (p = ents + (ctx->pos - 2); p < ents + nents; p++) {
|
|
if (!proc_fill_cache(file, ctx, p->name, p->len,
|
|
proc_pident_instantiate, task, p))
|
|
break;
|
|
ctx->pos++;
|
|
}
|
|
out:
|
|
put_task_struct(task);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_SECURITY
|
|
static int proc_pid_attr_open(struct inode *inode, struct file *file)
|
|
{
|
|
file->private_data = NULL;
|
|
__mem_open(inode, file, PTRACE_MODE_READ_FSCREDS);
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t proc_pid_attr_read(struct file * file, char __user * buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct inode * inode = file_inode(file);
|
|
char *p = NULL;
|
|
ssize_t length;
|
|
struct task_struct *task = get_proc_task(inode);
|
|
|
|
if (!task)
|
|
return -ESRCH;
|
|
|
|
length = security_getprocattr(task, PROC_I(inode)->op.lsm,
|
|
(char*)file->f_path.dentry->d_name.name,
|
|
&p);
|
|
put_task_struct(task);
|
|
if (length > 0)
|
|
length = simple_read_from_buffer(buf, count, ppos, p, length);
|
|
kfree(p);
|
|
return length;
|
|
}
|
|
|
|
static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct inode * inode = file_inode(file);
|
|
struct task_struct *task;
|
|
void *page;
|
|
int rv;
|
|
|
|
/* A task may only write when it was the opener. */
|
|
if (file->private_data != current->mm)
|
|
return -EPERM;
|
|
|
|
rcu_read_lock();
|
|
task = pid_task(proc_pid(inode), PIDTYPE_PID);
|
|
if (!task) {
|
|
rcu_read_unlock();
|
|
return -ESRCH;
|
|
}
|
|
/* A task may only write its own attributes. */
|
|
if (current != task) {
|
|
rcu_read_unlock();
|
|
return -EACCES;
|
|
}
|
|
/* Prevent changes to overridden credentials. */
|
|
if (current_cred() != current_real_cred()) {
|
|
rcu_read_unlock();
|
|
return -EBUSY;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (count > PAGE_SIZE)
|
|
count = PAGE_SIZE;
|
|
|
|
/* No partial writes. */
|
|
if (*ppos != 0)
|
|
return -EINVAL;
|
|
|
|
page = memdup_user(buf, count);
|
|
if (IS_ERR(page)) {
|
|
rv = PTR_ERR(page);
|
|
goto out;
|
|
}
|
|
|
|
/* Guard against adverse ptrace interaction */
|
|
rv = mutex_lock_interruptible(¤t->signal->cred_guard_mutex);
|
|
if (rv < 0)
|
|
goto out_free;
|
|
|
|
rv = security_setprocattr(PROC_I(inode)->op.lsm,
|
|
file->f_path.dentry->d_name.name, page,
|
|
count);
|
|
mutex_unlock(¤t->signal->cred_guard_mutex);
|
|
out_free:
|
|
kfree(page);
|
|
out:
|
|
return rv;
|
|
}
|
|
|
|
static const struct file_operations proc_pid_attr_operations = {
|
|
.open = proc_pid_attr_open,
|
|
.read = proc_pid_attr_read,
|
|
.write = proc_pid_attr_write,
|
|
.llseek = generic_file_llseek,
|
|
.release = mem_release,
|
|
};
|
|
|
|
#define LSM_DIR_OPS(LSM) \
|
|
static int proc_##LSM##_attr_dir_iterate(struct file *filp, \
|
|
struct dir_context *ctx) \
|
|
{ \
|
|
return proc_pident_readdir(filp, ctx, \
|
|
LSM##_attr_dir_stuff, \
|
|
ARRAY_SIZE(LSM##_attr_dir_stuff)); \
|
|
} \
|
|
\
|
|
static const struct file_operations proc_##LSM##_attr_dir_ops = { \
|
|
.read = generic_read_dir, \
|
|
.iterate = proc_##LSM##_attr_dir_iterate, \
|
|
.llseek = default_llseek, \
|
|
}; \
|
|
\
|
|
static struct dentry *proc_##LSM##_attr_dir_lookup(struct inode *dir, \
|
|
struct dentry *dentry, unsigned int flags) \
|
|
{ \
|
|
return proc_pident_lookup(dir, dentry, \
|
|
LSM##_attr_dir_stuff, \
|
|
LSM##_attr_dir_stuff + ARRAY_SIZE(LSM##_attr_dir_stuff)); \
|
|
} \
|
|
\
|
|
static const struct inode_operations proc_##LSM##_attr_dir_inode_ops = { \
|
|
.lookup = proc_##LSM##_attr_dir_lookup, \
|
|
.getattr = pid_getattr, \
|
|
.setattr = proc_setattr, \
|
|
}
|
|
|
|
#ifdef CONFIG_SECURITY_SMACK
|
|
static const struct pid_entry smack_attr_dir_stuff[] = {
|
|
ATTR("smack", "current", 0666),
|
|
};
|
|
LSM_DIR_OPS(smack);
|
|
#endif
|
|
|
|
#ifdef CONFIG_SECURITY_APPARMOR
|
|
static const struct pid_entry apparmor_attr_dir_stuff[] = {
|
|
ATTR("apparmor", "current", 0666),
|
|
ATTR("apparmor", "prev", 0444),
|
|
ATTR("apparmor", "exec", 0666),
|
|
};
|
|
LSM_DIR_OPS(apparmor);
|
|
#endif
|
|
|
|
static const struct pid_entry attr_dir_stuff[] = {
|
|
ATTR(NULL, "current", 0666),
|
|
ATTR(NULL, "prev", 0444),
|
|
ATTR(NULL, "exec", 0666),
|
|
ATTR(NULL, "fscreate", 0666),
|
|
ATTR(NULL, "keycreate", 0666),
|
|
ATTR(NULL, "sockcreate", 0666),
|
|
#ifdef CONFIG_SECURITY_SMACK
|
|
DIR("smack", 0555,
|
|
proc_smack_attr_dir_inode_ops, proc_smack_attr_dir_ops),
|
|
#endif
|
|
#ifdef CONFIG_SECURITY_APPARMOR
|
|
DIR("apparmor", 0555,
|
|
proc_apparmor_attr_dir_inode_ops, proc_apparmor_attr_dir_ops),
|
|
#endif
|
|
};
|
|
|
|
static int proc_attr_dir_readdir(struct file *file, struct dir_context *ctx)
|
|
{
|
|
return proc_pident_readdir(file, ctx,
|
|
attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff));
|
|
}
|
|
|
|
static const struct file_operations proc_attr_dir_operations = {
|
|
.read = generic_read_dir,
|
|
.iterate_shared = proc_attr_dir_readdir,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static struct dentry *proc_attr_dir_lookup(struct inode *dir,
|
|
struct dentry *dentry, unsigned int flags)
|
|
{
|
|
return proc_pident_lookup(dir, dentry,
|
|
attr_dir_stuff,
|
|
attr_dir_stuff + ARRAY_SIZE(attr_dir_stuff));
|
|
}
|
|
|
|
static const struct inode_operations proc_attr_dir_inode_operations = {
|
|
.lookup = proc_attr_dir_lookup,
|
|
.getattr = pid_getattr,
|
|
.setattr = proc_setattr,
|
|
};
|
|
|
|
#endif
|
|
|
|
#ifdef CONFIG_ELF_CORE
|
|
static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct task_struct *task = get_proc_task(file_inode(file));
|
|
struct mm_struct *mm;
|
|
char buffer[PROC_NUMBUF];
|
|
size_t len;
|
|
int ret;
|
|
|
|
if (!task)
|
|
return -ESRCH;
|
|
|
|
ret = 0;
|
|
mm = get_task_mm(task);
|
|
if (mm) {
|
|
len = snprintf(buffer, sizeof(buffer), "%08lx\n",
|
|
((mm->flags & MMF_DUMP_FILTER_MASK) >>
|
|
MMF_DUMP_FILTER_SHIFT));
|
|
mmput(mm);
|
|
ret = simple_read_from_buffer(buf, count, ppos, buffer, len);
|
|
}
|
|
|
|
put_task_struct(task);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t proc_coredump_filter_write(struct file *file,
|
|
const char __user *buf,
|
|
size_t count,
|
|
loff_t *ppos)
|
|
{
|
|
struct task_struct *task;
|
|
struct mm_struct *mm;
|
|
unsigned int val;
|
|
int ret;
|
|
int i;
|
|
unsigned long mask;
|
|
|
|
ret = kstrtouint_from_user(buf, count, 0, &val);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = -ESRCH;
|
|
task = get_proc_task(file_inode(file));
|
|
if (!task)
|
|
goto out_no_task;
|
|
|
|
mm = get_task_mm(task);
|
|
if (!mm)
|
|
goto out_no_mm;
|
|
ret = 0;
|
|
|
|
for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) {
|
|
if (val & mask)
|
|
set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
|
|
else
|
|
clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
|
|
}
|
|
|
|
mmput(mm);
|
|
out_no_mm:
|
|
put_task_struct(task);
|
|
out_no_task:
|
|
if (ret < 0)
|
|
return ret;
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations proc_coredump_filter_operations = {
|
|
.read = proc_coredump_filter_read,
|
|
.write = proc_coredump_filter_write,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
#endif
|
|
|
|
#ifdef CONFIG_TASK_IO_ACCOUNTING
|
|
static int do_io_accounting(struct task_struct *task, struct seq_file *m, int whole)
|
|
{
|
|
struct task_io_accounting acct = task->ioac;
|
|
unsigned long flags;
|
|
int result;
|
|
|
|
result = down_read_killable(&task->signal->exec_update_lock);
|
|
if (result)
|
|
return result;
|
|
|
|
if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) {
|
|
result = -EACCES;
|
|
goto out_unlock;
|
|
}
|
|
|
|
if (whole && lock_task_sighand(task, &flags)) {
|
|
struct task_struct *t = task;
|
|
|
|
task_io_accounting_add(&acct, &task->signal->ioac);
|
|
while_each_thread(task, t)
|
|
task_io_accounting_add(&acct, &t->ioac);
|
|
|
|
unlock_task_sighand(task, &flags);
|
|
}
|
|
seq_printf(m,
|
|
"rchar: %llu\n"
|
|
"wchar: %llu\n"
|
|
"syscr: %llu\n"
|
|
"syscw: %llu\n"
|
|
"read_bytes: %llu\n"
|
|
"write_bytes: %llu\n"
|
|
"cancelled_write_bytes: %llu\n",
|
|
(unsigned long long)acct.rchar,
|
|
(unsigned long long)acct.wchar,
|
|
(unsigned long long)acct.syscr,
|
|
(unsigned long long)acct.syscw,
|
|
(unsigned long long)acct.read_bytes,
|
|
(unsigned long long)acct.write_bytes,
|
|
(unsigned long long)acct.cancelled_write_bytes);
|
|
result = 0;
|
|
|
|
out_unlock:
|
|
up_read(&task->signal->exec_update_lock);
|
|
return result;
|
|
}
|
|
|
|
static int proc_tid_io_accounting(struct seq_file *m, struct pid_namespace *ns,
|
|
struct pid *pid, struct task_struct *task)
|
|
{
|
|
return do_io_accounting(task, m, 0);
|
|
}
|
|
|
|
static int proc_tgid_io_accounting(struct seq_file *m, struct pid_namespace *ns,
|
|
struct pid *pid, struct task_struct *task)
|
|
{
|
|
return do_io_accounting(task, m, 1);
|
|
}
|
|
#endif /* CONFIG_TASK_IO_ACCOUNTING */
|
|
|
|
#ifdef CONFIG_USER_NS
|
|
static int proc_id_map_open(struct inode *inode, struct file *file,
|
|
const struct seq_operations *seq_ops)
|
|
{
|
|
struct user_namespace *ns = NULL;
|
|
struct task_struct *task;
|
|
struct seq_file *seq;
|
|
int ret = -EINVAL;
|
|
|
|
task = get_proc_task(inode);
|
|
if (task) {
|
|
rcu_read_lock();
|
|
ns = get_user_ns(task_cred_xxx(task, user_ns));
|
|
rcu_read_unlock();
|
|
put_task_struct(task);
|
|
}
|
|
if (!ns)
|
|
goto err;
|
|
|
|
ret = seq_open(file, seq_ops);
|
|
if (ret)
|
|
goto err_put_ns;
|
|
|
|
seq = file->private_data;
|
|
seq->private = ns;
|
|
|
|
return 0;
|
|
err_put_ns:
|
|
put_user_ns(ns);
|
|
err:
|
|
return ret;
|
|
}
|
|
|
|
static int proc_id_map_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct seq_file *seq = file->private_data;
|
|
struct user_namespace *ns = seq->private;
|
|
put_user_ns(ns);
|
|
return seq_release(inode, file);
|
|
}
|
|
|
|
static int proc_uid_map_open(struct inode *inode, struct file *file)
|
|
{
|
|
return proc_id_map_open(inode, file, &proc_uid_seq_operations);
|
|
}
|
|
|
|
static int proc_gid_map_open(struct inode *inode, struct file *file)
|
|
{
|
|
return proc_id_map_open(inode, file, &proc_gid_seq_operations);
|
|
}
|
|
|
|
static int proc_projid_map_open(struct inode *inode, struct file *file)
|
|
{
|
|
return proc_id_map_open(inode, file, &proc_projid_seq_operations);
|
|
}
|
|
|
|
static const struct file_operations proc_uid_map_operations = {
|
|
.open = proc_uid_map_open,
|
|
.write = proc_uid_map_write,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = proc_id_map_release,
|
|
};
|
|
|
|
static const struct file_operations proc_gid_map_operations = {
|
|
.open = proc_gid_map_open,
|
|
.write = proc_gid_map_write,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = proc_id_map_release,
|
|
};
|
|
|
|
static const struct file_operations proc_projid_map_operations = {
|
|
.open = proc_projid_map_open,
|
|
.write = proc_projid_map_write,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = proc_id_map_release,
|
|
};
|
|
|
|
static int proc_setgroups_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct user_namespace *ns = NULL;
|
|
struct task_struct *task;
|
|
int ret;
|
|
|
|
ret = -ESRCH;
|
|
task = get_proc_task(inode);
|
|
if (task) {
|
|
rcu_read_lock();
|
|
ns = get_user_ns(task_cred_xxx(task, user_ns));
|
|
rcu_read_unlock();
|
|
put_task_struct(task);
|
|
}
|
|
if (!ns)
|
|
goto err;
|
|
|
|
if (file->f_mode & FMODE_WRITE) {
|
|
ret = -EACCES;
|
|
if (!ns_capable(ns, CAP_SYS_ADMIN))
|
|
goto err_put_ns;
|
|
}
|
|
|
|
ret = single_open(file, &proc_setgroups_show, ns);
|
|
if (ret)
|
|
goto err_put_ns;
|
|
|
|
return 0;
|
|
err_put_ns:
|
|
put_user_ns(ns);
|
|
err:
|
|
return ret;
|
|
}
|
|
|
|
static int proc_setgroups_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct seq_file *seq = file->private_data;
|
|
struct user_namespace *ns = seq->private;
|
|
int ret = single_release(inode, file);
|
|
put_user_ns(ns);
|
|
return ret;
|
|
}
|
|
|
|
static const struct file_operations proc_setgroups_operations = {
|
|
.open = proc_setgroups_open,
|
|
.write = proc_setgroups_write,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = proc_setgroups_release,
|
|
};
|
|
#endif /* CONFIG_USER_NS */
|
|
|
|
static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns,
|
|
struct pid *pid, struct task_struct *task)
|
|
{
|
|
int err = lock_trace(task);
|
|
if (!err) {
|
|
seq_printf(m, "%08x\n", task->personality);
|
|
unlock_trace(task);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
#ifdef CONFIG_LIVEPATCH
|
|
static int proc_pid_patch_state(struct seq_file *m, struct pid_namespace *ns,
|
|
struct pid *pid, struct task_struct *task)
|
|
{
|
|
seq_printf(m, "%d\n", task->patch_state);
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_LIVEPATCH */
|
|
|
|
#ifdef CONFIG_KSM
|
|
static int proc_pid_ksm_merging_pages(struct seq_file *m, struct pid_namespace *ns,
|
|
struct pid *pid, struct task_struct *task)
|
|
{
|
|
struct mm_struct *mm;
|
|
|
|
mm = get_task_mm(task);
|
|
if (mm) {
|
|
seq_printf(m, "%lu\n", mm->ksm_merging_pages);
|
|
mmput(mm);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_KSM */
|
|
|
|
#ifdef CONFIG_STACKLEAK_METRICS
|
|
static int proc_stack_depth(struct seq_file *m, struct pid_namespace *ns,
|
|
struct pid *pid, struct task_struct *task)
|
|
{
|
|
unsigned long prev_depth = THREAD_SIZE -
|
|
(task->prev_lowest_stack & (THREAD_SIZE - 1));
|
|
unsigned long depth = THREAD_SIZE -
|
|
(task->lowest_stack & (THREAD_SIZE - 1));
|
|
|
|
seq_printf(m, "previous stack depth: %lu\nstack depth: %lu\n",
|
|
prev_depth, depth);
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_STACKLEAK_METRICS */
|
|
|
|
/*
|
|
* Thread groups
|
|
*/
|
|
static const struct file_operations proc_task_operations;
|
|
static const struct inode_operations proc_task_inode_operations;
|
|
|
|
static const struct pid_entry tgid_base_stuff[] = {
|
|
DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations),
|
|
DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
|
|
DIR("map_files", S_IRUSR|S_IXUSR, proc_map_files_inode_operations, proc_map_files_operations),
|
|
DIR("fdinfo", S_IRUGO|S_IXUGO, proc_fdinfo_inode_operations, proc_fdinfo_operations),
|
|
DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations),
|
|
#ifdef CONFIG_NET
|
|
DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations),
|
|
#endif
|
|
REG("environ", S_IRUSR, proc_environ_operations),
|
|
REG("auxv", S_IRUSR, proc_auxv_operations),
|
|
ONE("status", S_IRUGO, proc_pid_status),
|
|
ONE("personality", S_IRUSR, proc_pid_personality),
|
|
ONE("limits", S_IRUGO, proc_pid_limits),
|
|
#ifdef CONFIG_SCHED_DEBUG
|
|
REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
|
|
#endif
|
|
#ifdef CONFIG_SCHED_AUTOGROUP
|
|
REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations),
|
|
#endif
|
|
#ifdef CONFIG_TIME_NS
|
|
REG("timens_offsets", S_IRUGO|S_IWUSR, proc_timens_offsets_operations),
|
|
#endif
|
|
REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
|
|
#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
|
|
ONE("syscall", S_IRUSR, proc_pid_syscall),
|
|
#endif
|
|
REG("cmdline", S_IRUGO, proc_pid_cmdline_ops),
|
|
ONE("stat", S_IRUGO, proc_tgid_stat),
|
|
ONE("statm", S_IRUGO, proc_pid_statm),
|
|
REG("maps", S_IRUGO, proc_pid_maps_operations),
|
|
#ifdef CONFIG_NUMA
|
|
REG("numa_maps", S_IRUGO, proc_pid_numa_maps_operations),
|
|
#endif
|
|
REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
|
|
LNK("cwd", proc_cwd_link),
|
|
LNK("root", proc_root_link),
|
|
LNK("exe", proc_exe_link),
|
|
REG("mounts", S_IRUGO, proc_mounts_operations),
|
|
REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
|
|
REG("mountstats", S_IRUSR, proc_mountstats_operations),
|
|
#ifdef CONFIG_PROC_PAGE_MONITOR
|
|
REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
|
|
REG("smaps", S_IRUGO, proc_pid_smaps_operations),
|
|
REG("smaps_rollup", S_IRUGO, proc_pid_smaps_rollup_operations),
|
|
REG("pagemap", S_IRUSR, proc_pagemap_operations),
|
|
#endif
|
|
#ifdef CONFIG_SECURITY
|
|
DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
|
|
#endif
|
|
#ifdef CONFIG_KALLSYMS
|
|
ONE("wchan", S_IRUGO, proc_pid_wchan),
|
|
#endif
|
|
#ifdef CONFIG_STACKTRACE
|
|
ONE("stack", S_IRUSR, proc_pid_stack),
|
|
#endif
|
|
#ifdef CONFIG_SCHED_INFO
|
|
ONE("schedstat", S_IRUGO, proc_pid_schedstat),
|
|
#endif
|
|
#ifdef CONFIG_LATENCYTOP
|
|
REG("latency", S_IRUGO, proc_lstats_operations),
|
|
#endif
|
|
#ifdef CONFIG_PROC_PID_CPUSET
|
|
ONE("cpuset", S_IRUGO, proc_cpuset_show),
|
|
#endif
|
|
#ifdef CONFIG_CGROUPS
|
|
ONE("cgroup", S_IRUGO, proc_cgroup_show),
|
|
#endif
|
|
#ifdef CONFIG_PROC_CPU_RESCTRL
|
|
ONE("cpu_resctrl_groups", S_IRUGO, proc_resctrl_show),
|
|
#endif
|
|
ONE("oom_score", S_IRUGO, proc_oom_score),
|
|
REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations),
|
|
REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
|
|
#ifdef CONFIG_AUDIT
|
|
REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
|
|
REG("sessionid", S_IRUGO, proc_sessionid_operations),
|
|
#endif
|
|
#ifdef CONFIG_FAULT_INJECTION
|
|
REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
|
|
REG("fail-nth", 0644, proc_fail_nth_operations),
|
|
#endif
|
|
#ifdef CONFIG_ELF_CORE
|
|
REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations),
|
|
#endif
|
|
#ifdef CONFIG_TASK_IO_ACCOUNTING
|
|
ONE("io", S_IRUSR, proc_tgid_io_accounting),
|
|
#endif
|
|
#ifdef CONFIG_USER_NS
|
|
REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations),
|
|
REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations),
|
|
REG("projid_map", S_IRUGO|S_IWUSR, proc_projid_map_operations),
|
|
REG("setgroups", S_IRUGO|S_IWUSR, proc_setgroups_operations),
|
|
#endif
|
|
#if defined(CONFIG_CHECKPOINT_RESTORE) && defined(CONFIG_POSIX_TIMERS)
|
|
REG("timers", S_IRUGO, proc_timers_operations),
|
|
#endif
|
|
REG("timerslack_ns", S_IRUGO|S_IWUGO, proc_pid_set_timerslack_ns_operations),
|
|
#ifdef CONFIG_LIVEPATCH
|
|
ONE("patch_state", S_IRUSR, proc_pid_patch_state),
|
|
#endif
|
|
#ifdef CONFIG_STACKLEAK_METRICS
|
|
ONE("stack_depth", S_IRUGO, proc_stack_depth),
|
|
#endif
|
|
#ifdef CONFIG_PROC_PID_ARCH_STATUS
|
|
ONE("arch_status", S_IRUGO, proc_pid_arch_status),
|
|
#endif
|
|
#ifdef CONFIG_SECCOMP_CACHE_DEBUG
|
|
ONE("seccomp_cache", S_IRUSR, proc_pid_seccomp_cache),
|
|
#endif
|
|
#ifdef CONFIG_KSM
|
|
ONE("ksm_merging_pages", S_IRUSR, proc_pid_ksm_merging_pages),
|
|
#endif
|
|
};
|
|
|
|
static int proc_tgid_base_readdir(struct file *file, struct dir_context *ctx)
|
|
{
|
|
return proc_pident_readdir(file, ctx,
|
|
tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff));
|
|
}
|
|
|
|
static const struct file_operations proc_tgid_base_operations = {
|
|
.read = generic_read_dir,
|
|
.iterate_shared = proc_tgid_base_readdir,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
struct pid *tgid_pidfd_to_pid(const struct file *file)
|
|
{
|
|
if (file->f_op != &proc_tgid_base_operations)
|
|
return ERR_PTR(-EBADF);
|
|
|
|
return proc_pid(file_inode(file));
|
|
}
|
|
|
|
static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
|
|
{
|
|
return proc_pident_lookup(dir, dentry,
|
|
tgid_base_stuff,
|
|
tgid_base_stuff + ARRAY_SIZE(tgid_base_stuff));
|
|
}
|
|
|
|
static const struct inode_operations proc_tgid_base_inode_operations = {
|
|
.lookup = proc_tgid_base_lookup,
|
|
.getattr = pid_getattr,
|
|
.setattr = proc_setattr,
|
|
.permission = proc_pid_permission,
|
|
};
|
|
|
|
/**
|
|
* proc_flush_pid - Remove dcache entries for @pid from the /proc dcache.
|
|
* @pid: pid that should be flushed.
|
|
*
|
|
* This function walks a list of inodes (that belong to any proc
|
|
* filesystem) that are attached to the pid and flushes them from
|
|
* the dentry cache.
|
|
*
|
|
* It is safe and reasonable to cache /proc entries for a task until
|
|
* that task exits. After that they just clog up the dcache with
|
|
* useless entries, possibly causing useful dcache entries to be
|
|
* flushed instead. This routine is provided to flush those useless
|
|
* dcache entries when a process is reaped.
|
|
*
|
|
* NOTE: This routine is just an optimization so it does not guarantee
|
|
* that no dcache entries will exist after a process is reaped
|
|
* it just makes it very unlikely that any will persist.
|
|
*/
|
|
|
|
void proc_flush_pid(struct pid *pid)
|
|
{
|
|
proc_invalidate_siblings_dcache(&pid->inodes, &pid->lock);
|
|
}
|
|
|
|
static struct dentry *proc_pid_instantiate(struct dentry * dentry,
|
|
struct task_struct *task, const void *ptr)
|
|
{
|
|
struct inode *inode;
|
|
|
|
inode = proc_pid_make_base_inode(dentry->d_sb, task,
|
|
S_IFDIR | S_IRUGO | S_IXUGO);
|
|
if (!inode)
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
inode->i_op = &proc_tgid_base_inode_operations;
|
|
inode->i_fop = &proc_tgid_base_operations;
|
|
inode->i_flags|=S_IMMUTABLE;
|
|
|
|
set_nlink(inode, nlink_tgid);
|
|
pid_update_inode(task, inode);
|
|
|
|
d_set_d_op(dentry, &pid_dentry_operations);
|
|
return d_splice_alias(inode, dentry);
|
|
}
|
|
|
|
struct dentry *proc_pid_lookup(struct dentry *dentry, unsigned int flags)
|
|
{
|
|
struct task_struct *task;
|
|
unsigned tgid;
|
|
struct proc_fs_info *fs_info;
|
|
struct pid_namespace *ns;
|
|
struct dentry *result = ERR_PTR(-ENOENT);
|
|
|
|
tgid = name_to_int(&dentry->d_name);
|
|
if (tgid == ~0U)
|
|
goto out;
|
|
|
|
fs_info = proc_sb_info(dentry->d_sb);
|
|
ns = fs_info->pid_ns;
|
|
rcu_read_lock();
|
|
task = find_task_by_pid_ns(tgid, ns);
|
|
if (task)
|
|
get_task_struct(task);
|
|
rcu_read_unlock();
|
|
if (!task)
|
|
goto out;
|
|
|
|
/* Limit procfs to only ptraceable tasks */
|
|
if (fs_info->hide_pid == HIDEPID_NOT_PTRACEABLE) {
|
|
if (!has_pid_permissions(fs_info, task, HIDEPID_NO_ACCESS))
|
|
goto out_put_task;
|
|
}
|
|
|
|
result = proc_pid_instantiate(dentry, task, NULL);
|
|
out_put_task:
|
|
put_task_struct(task);
|
|
out:
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Find the first task with tgid >= tgid
|
|
*
|
|
*/
|
|
struct tgid_iter {
|
|
unsigned int tgid;
|
|
struct task_struct *task;
|
|
};
|
|
static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter)
|
|
{
|
|
struct pid *pid;
|
|
|
|
if (iter.task)
|
|
put_task_struct(iter.task);
|
|
rcu_read_lock();
|
|
retry:
|
|
iter.task = NULL;
|
|
pid = find_ge_pid(iter.tgid, ns);
|
|
if (pid) {
|
|
iter.tgid = pid_nr_ns(pid, ns);
|
|
iter.task = pid_task(pid, PIDTYPE_TGID);
|
|
if (!iter.task) {
|
|
iter.tgid += 1;
|
|
goto retry;
|
|
}
|
|
get_task_struct(iter.task);
|
|
}
|
|
rcu_read_unlock();
|
|
return iter;
|
|
}
|
|
|
|
#define TGID_OFFSET (FIRST_PROCESS_ENTRY + 2)
|
|
|
|
/* for the /proc/ directory itself, after non-process stuff has been done */
|
|
int proc_pid_readdir(struct file *file, struct dir_context *ctx)
|
|
{
|
|
struct tgid_iter iter;
|
|
struct proc_fs_info *fs_info = proc_sb_info(file_inode(file)->i_sb);
|
|
struct pid_namespace *ns = proc_pid_ns(file_inode(file)->i_sb);
|
|
loff_t pos = ctx->pos;
|
|
|
|
if (pos >= PID_MAX_LIMIT + TGID_OFFSET)
|
|
return 0;
|
|
|
|
if (pos == TGID_OFFSET - 2) {
|
|
struct inode *inode = d_inode(fs_info->proc_self);
|
|
if (!dir_emit(ctx, "self", 4, inode->i_ino, DT_LNK))
|
|
return 0;
|
|
ctx->pos = pos = pos + 1;
|
|
}
|
|
if (pos == TGID_OFFSET - 1) {
|
|
struct inode *inode = d_inode(fs_info->proc_thread_self);
|
|
if (!dir_emit(ctx, "thread-self", 11, inode->i_ino, DT_LNK))
|
|
return 0;
|
|
ctx->pos = pos = pos + 1;
|
|
}
|
|
iter.tgid = pos - TGID_OFFSET;
|
|
iter.task = NULL;
|
|
for (iter = next_tgid(ns, iter);
|
|
iter.task;
|
|
iter.tgid += 1, iter = next_tgid(ns, iter)) {
|
|
char name[10 + 1];
|
|
unsigned int len;
|
|
|
|
cond_resched();
|
|
if (!has_pid_permissions(fs_info, iter.task, HIDEPID_INVISIBLE))
|
|
continue;
|
|
|
|
len = snprintf(name, sizeof(name), "%u", iter.tgid);
|
|
ctx->pos = iter.tgid + TGID_OFFSET;
|
|
if (!proc_fill_cache(file, ctx, name, len,
|
|
proc_pid_instantiate, iter.task, NULL)) {
|
|
put_task_struct(iter.task);
|
|
return 0;
|
|
}
|
|
}
|
|
ctx->pos = PID_MAX_LIMIT + TGID_OFFSET;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* proc_tid_comm_permission is a special permission function exclusively
|
|
* used for the node /proc/<pid>/task/<tid>/comm.
|
|
* It bypasses generic permission checks in the case where a task of the same
|
|
* task group attempts to access the node.
|
|
* The rationale behind this is that glibc and bionic access this node for
|
|
* cross thread naming (pthread_set/getname_np(!self)). However, if
|
|
* PR_SET_DUMPABLE gets set to 0 this node among others becomes uid=0 gid=0,
|
|
* which locks out the cross thread naming implementation.
|
|
* This function makes sure that the node is always accessible for members of
|
|
* same thread group.
|
|
*/
|
|
static int proc_tid_comm_permission(struct user_namespace *mnt_userns,
|
|
struct inode *inode, int mask)
|
|
{
|
|
bool is_same_tgroup;
|
|
struct task_struct *task;
|
|
|
|
task = get_proc_task(inode);
|
|
if (!task)
|
|
return -ESRCH;
|
|
is_same_tgroup = same_thread_group(current, task);
|
|
put_task_struct(task);
|
|
|
|
if (likely(is_same_tgroup && !(mask & MAY_EXEC))) {
|
|
/* This file (/proc/<pid>/task/<tid>/comm) can always be
|
|
* read or written by the members of the corresponding
|
|
* thread group.
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
return generic_permission(&init_user_ns, inode, mask);
|
|
}
|
|
|
|
static const struct inode_operations proc_tid_comm_inode_operations = {
|
|
.permission = proc_tid_comm_permission,
|
|
};
|
|
|
|
/*
|
|
* Tasks
|
|
*/
|
|
static const struct pid_entry tid_base_stuff[] = {
|
|
DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
|
|
DIR("fdinfo", S_IRUGO|S_IXUGO, proc_fdinfo_inode_operations, proc_fdinfo_operations),
|
|
DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations),
|
|
#ifdef CONFIG_NET
|
|
DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations),
|
|
#endif
|
|
REG("environ", S_IRUSR, proc_environ_operations),
|
|
REG("auxv", S_IRUSR, proc_auxv_operations),
|
|
ONE("status", S_IRUGO, proc_pid_status),
|
|
ONE("personality", S_IRUSR, proc_pid_personality),
|
|
ONE("limits", S_IRUGO, proc_pid_limits),
|
|
#ifdef CONFIG_SCHED_DEBUG
|
|
REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
|
|
#endif
|
|
NOD("comm", S_IFREG|S_IRUGO|S_IWUSR,
|
|
&proc_tid_comm_inode_operations,
|
|
&proc_pid_set_comm_operations, {}),
|
|
#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
|
|
ONE("syscall", S_IRUSR, proc_pid_syscall),
|
|
#endif
|
|
REG("cmdline", S_IRUGO, proc_pid_cmdline_ops),
|
|
ONE("stat", S_IRUGO, proc_tid_stat),
|
|
ONE("statm", S_IRUGO, proc_pid_statm),
|
|
REG("maps", S_IRUGO, proc_pid_maps_operations),
|
|
#ifdef CONFIG_PROC_CHILDREN
|
|
REG("children", S_IRUGO, proc_tid_children_operations),
|
|
#endif
|
|
#ifdef CONFIG_NUMA
|
|
REG("numa_maps", S_IRUGO, proc_pid_numa_maps_operations),
|
|
#endif
|
|
REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
|
|
LNK("cwd", proc_cwd_link),
|
|
LNK("root", proc_root_link),
|
|
LNK("exe", proc_exe_link),
|
|
REG("mounts", S_IRUGO, proc_mounts_operations),
|
|
REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
|
|
#ifdef CONFIG_PROC_PAGE_MONITOR
|
|
REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
|
|
REG("smaps", S_IRUGO, proc_pid_smaps_operations),
|
|
REG("smaps_rollup", S_IRUGO, proc_pid_smaps_rollup_operations),
|
|
REG("pagemap", S_IRUSR, proc_pagemap_operations),
|
|
#endif
|
|
#ifdef CONFIG_SECURITY
|
|
DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
|
|
#endif
|
|
#ifdef CONFIG_KALLSYMS
|
|
ONE("wchan", S_IRUGO, proc_pid_wchan),
|
|
#endif
|
|
#ifdef CONFIG_STACKTRACE
|
|
ONE("stack", S_IRUSR, proc_pid_stack),
|
|
#endif
|
|
#ifdef CONFIG_SCHED_INFO
|
|
ONE("schedstat", S_IRUGO, proc_pid_schedstat),
|
|
#endif
|
|
#ifdef CONFIG_LATENCYTOP
|
|
REG("latency", S_IRUGO, proc_lstats_operations),
|
|
#endif
|
|
#ifdef CONFIG_PROC_PID_CPUSET
|
|
ONE("cpuset", S_IRUGO, proc_cpuset_show),
|
|
#endif
|
|
#ifdef CONFIG_CGROUPS
|
|
ONE("cgroup", S_IRUGO, proc_cgroup_show),
|
|
#endif
|
|
#ifdef CONFIG_PROC_CPU_RESCTRL
|
|
ONE("cpu_resctrl_groups", S_IRUGO, proc_resctrl_show),
|
|
#endif
|
|
ONE("oom_score", S_IRUGO, proc_oom_score),
|
|
REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations),
|
|
REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
|
|
#ifdef CONFIG_AUDIT
|
|
REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
|
|
REG("sessionid", S_IRUGO, proc_sessionid_operations),
|
|
#endif
|
|
#ifdef CONFIG_FAULT_INJECTION
|
|
REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
|
|
REG("fail-nth", 0644, proc_fail_nth_operations),
|
|
#endif
|
|
#ifdef CONFIG_TASK_IO_ACCOUNTING
|
|
ONE("io", S_IRUSR, proc_tid_io_accounting),
|
|
#endif
|
|
#ifdef CONFIG_USER_NS
|
|
REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations),
|
|
REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations),
|
|
REG("projid_map", S_IRUGO|S_IWUSR, proc_projid_map_operations),
|
|
REG("setgroups", S_IRUGO|S_IWUSR, proc_setgroups_operations),
|
|
#endif
|
|
#ifdef CONFIG_LIVEPATCH
|
|
ONE("patch_state", S_IRUSR, proc_pid_patch_state),
|
|
#endif
|
|
#ifdef CONFIG_PROC_PID_ARCH_STATUS
|
|
ONE("arch_status", S_IRUGO, proc_pid_arch_status),
|
|
#endif
|
|
#ifdef CONFIG_SECCOMP_CACHE_DEBUG
|
|
ONE("seccomp_cache", S_IRUSR, proc_pid_seccomp_cache),
|
|
#endif
|
|
#ifdef CONFIG_KSM
|
|
ONE("ksm_merging_pages", S_IRUSR, proc_pid_ksm_merging_pages),
|
|
#endif
|
|
};
|
|
|
|
static int proc_tid_base_readdir(struct file *file, struct dir_context *ctx)
|
|
{
|
|
return proc_pident_readdir(file, ctx,
|
|
tid_base_stuff, ARRAY_SIZE(tid_base_stuff));
|
|
}
|
|
|
|
static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
|
|
{
|
|
return proc_pident_lookup(dir, dentry,
|
|
tid_base_stuff,
|
|
tid_base_stuff + ARRAY_SIZE(tid_base_stuff));
|
|
}
|
|
|
|
static const struct file_operations proc_tid_base_operations = {
|
|
.read = generic_read_dir,
|
|
.iterate_shared = proc_tid_base_readdir,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static const struct inode_operations proc_tid_base_inode_operations = {
|
|
.lookup = proc_tid_base_lookup,
|
|
.getattr = pid_getattr,
|
|
.setattr = proc_setattr,
|
|
};
|
|
|
|
static struct dentry *proc_task_instantiate(struct dentry *dentry,
|
|
struct task_struct *task, const void *ptr)
|
|
{
|
|
struct inode *inode;
|
|
inode = proc_pid_make_base_inode(dentry->d_sb, task,
|
|
S_IFDIR | S_IRUGO | S_IXUGO);
|
|
if (!inode)
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
inode->i_op = &proc_tid_base_inode_operations;
|
|
inode->i_fop = &proc_tid_base_operations;
|
|
inode->i_flags |= S_IMMUTABLE;
|
|
|
|
set_nlink(inode, nlink_tid);
|
|
pid_update_inode(task, inode);
|
|
|
|
d_set_d_op(dentry, &pid_dentry_operations);
|
|
return d_splice_alias(inode, dentry);
|
|
}
|
|
|
|
static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags)
|
|
{
|
|
struct task_struct *task;
|
|
struct task_struct *leader = get_proc_task(dir);
|
|
unsigned tid;
|
|
struct proc_fs_info *fs_info;
|
|
struct pid_namespace *ns;
|
|
struct dentry *result = ERR_PTR(-ENOENT);
|
|
|
|
if (!leader)
|
|
goto out_no_task;
|
|
|
|
tid = name_to_int(&dentry->d_name);
|
|
if (tid == ~0U)
|
|
goto out;
|
|
|
|
fs_info = proc_sb_info(dentry->d_sb);
|
|
ns = fs_info->pid_ns;
|
|
rcu_read_lock();
|
|
task = find_task_by_pid_ns(tid, ns);
|
|
if (task)
|
|
get_task_struct(task);
|
|
rcu_read_unlock();
|
|
if (!task)
|
|
goto out;
|
|
if (!same_thread_group(leader, task))
|
|
goto out_drop_task;
|
|
|
|
result = proc_task_instantiate(dentry, task, NULL);
|
|
out_drop_task:
|
|
put_task_struct(task);
|
|
out:
|
|
put_task_struct(leader);
|
|
out_no_task:
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Find the first tid of a thread group to return to user space.
|
|
*
|
|
* Usually this is just the thread group leader, but if the users
|
|
* buffer was too small or there was a seek into the middle of the
|
|
* directory we have more work todo.
|
|
*
|
|
* In the case of a short read we start with find_task_by_pid.
|
|
*
|
|
* In the case of a seek we start with the leader and walk nr
|
|
* threads past it.
|
|
*/
|
|
static struct task_struct *first_tid(struct pid *pid, int tid, loff_t f_pos,
|
|
struct pid_namespace *ns)
|
|
{
|
|
struct task_struct *pos, *task;
|
|
unsigned long nr = f_pos;
|
|
|
|
if (nr != f_pos) /* 32bit overflow? */
|
|
return NULL;
|
|
|
|
rcu_read_lock();
|
|
task = pid_task(pid, PIDTYPE_PID);
|
|
if (!task)
|
|
goto fail;
|
|
|
|
/* Attempt to start with the tid of a thread */
|
|
if (tid && nr) {
|
|
pos = find_task_by_pid_ns(tid, ns);
|
|
if (pos && same_thread_group(pos, task))
|
|
goto found;
|
|
}
|
|
|
|
/* If nr exceeds the number of threads there is nothing todo */
|
|
if (nr >= get_nr_threads(task))
|
|
goto fail;
|
|
|
|
/* If we haven't found our starting place yet start
|
|
* with the leader and walk nr threads forward.
|
|
*/
|
|
pos = task = task->group_leader;
|
|
do {
|
|
if (!nr--)
|
|
goto found;
|
|
} while_each_thread(task, pos);
|
|
fail:
|
|
pos = NULL;
|
|
goto out;
|
|
found:
|
|
get_task_struct(pos);
|
|
out:
|
|
rcu_read_unlock();
|
|
return pos;
|
|
}
|
|
|
|
/*
|
|
* Find the next thread in the thread list.
|
|
* Return NULL if there is an error or no next thread.
|
|
*
|
|
* The reference to the input task_struct is released.
|
|
*/
|
|
static struct task_struct *next_tid(struct task_struct *start)
|
|
{
|
|
struct task_struct *pos = NULL;
|
|
rcu_read_lock();
|
|
if (pid_alive(start)) {
|
|
pos = next_thread(start);
|
|
if (thread_group_leader(pos))
|
|
pos = NULL;
|
|
else
|
|
get_task_struct(pos);
|
|
}
|
|
rcu_read_unlock();
|
|
put_task_struct(start);
|
|
return pos;
|
|
}
|
|
|
|
/* for the /proc/TGID/task/ directories */
|
|
static int proc_task_readdir(struct file *file, struct dir_context *ctx)
|
|
{
|
|
struct inode *inode = file_inode(file);
|
|
struct task_struct *task;
|
|
struct pid_namespace *ns;
|
|
int tid;
|
|
|
|
if (proc_inode_is_dead(inode))
|
|
return -ENOENT;
|
|
|
|
if (!dir_emit_dots(file, ctx))
|
|
return 0;
|
|
|
|
/* f_version caches the tgid value that the last readdir call couldn't
|
|
* return. lseek aka telldir automagically resets f_version to 0.
|
|
*/
|
|
ns = proc_pid_ns(inode->i_sb);
|
|
tid = (int)file->f_version;
|
|
file->f_version = 0;
|
|
for (task = first_tid(proc_pid(inode), tid, ctx->pos - 2, ns);
|
|
task;
|
|
task = next_tid(task), ctx->pos++) {
|
|
char name[10 + 1];
|
|
unsigned int len;
|
|
|
|
tid = task_pid_nr_ns(task, ns);
|
|
if (!tid)
|
|
continue; /* The task has just exited. */
|
|
len = snprintf(name, sizeof(name), "%u", tid);
|
|
if (!proc_fill_cache(file, ctx, name, len,
|
|
proc_task_instantiate, task, NULL)) {
|
|
/* returning this tgid failed, save it as the first
|
|
* pid for the next readir call */
|
|
file->f_version = (u64)tid;
|
|
put_task_struct(task);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int proc_task_getattr(struct user_namespace *mnt_userns,
|
|
const struct path *path, struct kstat *stat,
|
|
u32 request_mask, unsigned int query_flags)
|
|
{
|
|
struct inode *inode = d_inode(path->dentry);
|
|
struct task_struct *p = get_proc_task(inode);
|
|
generic_fillattr(&init_user_ns, inode, stat);
|
|
|
|
if (p) {
|
|
stat->nlink += get_nr_threads(p);
|
|
put_task_struct(p);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct inode_operations proc_task_inode_operations = {
|
|
.lookup = proc_task_lookup,
|
|
.getattr = proc_task_getattr,
|
|
.setattr = proc_setattr,
|
|
.permission = proc_pid_permission,
|
|
};
|
|
|
|
static const struct file_operations proc_task_operations = {
|
|
.read = generic_read_dir,
|
|
.iterate_shared = proc_task_readdir,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
void __init set_proc_pid_nlink(void)
|
|
{
|
|
nlink_tid = pid_entry_nlink(tid_base_stuff, ARRAY_SIZE(tid_base_stuff));
|
|
nlink_tgid = pid_entry_nlink(tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff));
|
|
}
|