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audit: fix recursive locking deadlock in audit_dupe_exe()

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A deadlock occurs in the audit subsystem when duplicating
executable-related rules.

When a file is moved (e.g., via do_renameat2()), the VFS layer locks
the parent directory (I_MUTEX_PARENT), which synchronously triggers an
fsnotify_move event. If an existing executable audit rule matches the
file being moved, the audit subsystem catches this event and calls
audit_dupe_exe() to duplicate the watch and update the rule. Then,
audit_alloc_mark() would call kern_path_parent() to resolve the path,
leading to a blind attempt to acquire the exact same I_MUTEX_PARENT lock
already held by the task, resulting in the following recursive locking
deadlock:

 ============================================
 WARNING: possible recursive locking detected
 6.12.0-55.27.1.el10_0.x86_64+debug #1 Not tainted
 --------------------------------------------
 mv/5099 is trying to acquire lock:
 ffff888132845358 (&inode->i_sb->s_type->i_mutex_dir_key/1){+.+.}-{3:3},
 at: __kern_path_locked+0x10a/0x2f0

 but task is already holding lock:
 ffff888132846b58 (&inode->i_sb->s_type->i_mutex_dir_key/1){+.+.}-{3:3},
 at: lock_two_directories+0x13f/0x2b0

 other info that might help us debug this:
  Possible unsafe locking scenario:

        CPU0
        ----
   lock(&inode->i_sb->s_type->i_mutex_dir_key/1);
   lock(&inode->i_sb->s_type->i_mutex_dir_key/1);

  *** DEADLOCK ***

  May be due to missing lock nesting notation

  6 locks held by mv/5099:
  #0: ffff888112a9c440 (sb_writers#13)
  at: do_renameat2+0x34c/0xbc0
  #1: ffff888112a9c790 (&type->s_vfs_rename_key#3)
  at: do_renameat2+0x415/0xbc0
  #2: ffff888132846b58 (&inode->i_sb->s_type->i_mutex_dir_key/1)
  at: lock_two_directories+0x13f/0x2b0
  #3: ffff888132845358 (&inode->i_sb->s_type->i_mutex_dir_key/5)
  at: lock_two_directories+0x175/0x2b0
  #4: ffffffffb3a1fb10 (&fsnotify_mark_srcu)
  at: fsnotify+0x454/0x28a0
  #5: ffffffffaf886230 (audit_filter_mutex)
  at: audit_update_watch+0x36/0x11e0

 stack backtrace:
 Call Trace:
  <TASK>
  dump_stack_lvl+0x6f/0xb0
  print_deadlock_bug.cold+0xbd/0xca
  validate_chain+0x83a/0xf00
  __lock_acquire+0xcac/0x1d20
  lock_acquire.part.0+0x11b/0x360
  down_write_nested+0x9f/0x230
  __kern_path_locked+0x10a/0x2f0
  kern_path_locked+0x26/0x40
  audit_alloc_mark+0xfb/0x4f0
  audit_dupe_exe+0x6c/0xe0
  audit_dupe_rule+0x6c2/0xc00
  audit_update_watch+0x4cc/0x11e0
  audit_watch_handle_event+0x12c/0x1b0
  send_to_group+0x5d0/0x8b0
  fsnotify+0x615/0x28a0
  fsnotify_move+0x1d8/0x630
  vfs_rename+0xdcd/0x1df0
  do_renameat2+0x9d4/0xbc0
  __x64_sys_renameat+0x192/0x260
  do_syscall_64+0x92/0x180
  entry_SYSCALL_64_after_hwframe+0x76/0x7e
 RIP: 0033:0x7f0491fe8c4e
 Code: 0f 1f 40 00 48 8b 15 c1 e1 16 00 f7 d8 64 89 02 b8 ff ff ff ff
 c3 66 0f 1f 44 00 00 f3 0f 1e fa 49 89 ca b8 08 01 00 00 0f 05 <48>
 3d 00 f0 ff ff 77 0a c3 66 0f 1f 84 00 00 00 00 00 48 8b 15 89
 RSP: 002b:00007ffc7210bf38 EFLAGS: 00000246 ORIG_RAX: 0000000000000108
 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0491fe8c4e
 RDX: 0000000000000003 RSI: 00007ffc7210e6c8 RDI: 00000000ffffff9c
 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001
 R10: 00005575eb2dae2a R11: 0000000000000246 R12: 00005575eb2dae2a
 R13: 00007ffc7210e6c8 R14: 0000000000000003 R15: 00000000ffffff9c
  </TASK>

The aforementioned deadlock can be consistently reproduced by running
the script below:

 audit-dupe-exe-deadlock.sh
 --------------------------
 #!/bin/bash
 auditctl -D
 mkdir -p /tmp/foo
 touch /tmp/file
 auditctl -a always,exit -F exe=/tmp/file -F path=/tmp/file -S all -k dr
 mv /tmp/file /tmp/foo/file
 rm -Rf /tmp/foo

This patch fixes the issue by introducing struct audit_watch_ctx to pass
the fsnotify event context down to audit_alloc_mark(). By utilizing the
already-resolved directory inode provided by the event, we bypass the
kern_path_parent() path resolution entirely, safely avoiding the
recursive lock. Furthermore, it explicitly allows duplicate fsnotify
marks (allow_dups = 1) during the rename update, allowing the new rule's
mark to safely coexist with the old rule's mark until the old rule is
freed.

P.S.: This issue was identified and reproduced during a comprehensive
code coverage analysis of the audit subsystem. The full report is
available at the link below:

https://people.redhat.com/rrobaina/audit-code-coverage-analysis.pdf

P.P.S: With the permission of both Ricardo and Nathan, I've squashed a
fixup patch from Nathan that addresses a compile time error when
CONFIG_AUDITSYSCALL=n.

Cc: stable@kernel.org
Fixes: 34d99af52a ("audit: implement audit by executable")
Acked-by: Waiman Long <longman@redhat.com>
Acked-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Ricardo Robaina <rrobaina@redhat.com>
[PM: move link metadata into the msg, apply fix from NC]
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Ricardo Robaina 2026-05-27 19:15:34 -04:00 committed by Paul Moore
parent 888a0396e1
commit 81905b5acb
4 changed files with 57 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
kernel/audit.h
View File

@ -256,8 +256,13 @@ extern int audit_del_rule(struct audit_entry *entry);
extern void audit_free_rule_rcu(struct rcu_head *head);
extern struct list_head audit_filter_list[];
extern struct audit_entry *audit_dupe_rule(struct audit_krule *old);
struct audit_watch_ctx {
struct inode *dir;
struct inode *child;
};
extern struct audit_entry *audit_dupe_rule(struct audit_krule *old,
struct audit_watch_ctx *ctx);
extern void audit_log_d_path_exe(struct audit_buffer *ab,
struct mm_struct *mm);
@ -280,13 +285,15 @@ extern char *audit_watch_path(struct audit_watch *watch);
extern int audit_watch_compare(struct audit_watch *watch, u64 ino, dev_t dev);
extern struct audit_fsnotify_mark *audit_alloc_mark(struct audit_krule *krule,
char *pathname, int len);
char *pathname, int len,
struct audit_watch_ctx *ctx);
extern char *audit_mark_path(struct audit_fsnotify_mark *mark);
extern void audit_remove_mark(struct audit_fsnotify_mark *audit_mark);
extern void audit_remove_mark_rule(struct audit_krule *krule);
extern int audit_mark_compare(struct audit_fsnotify_mark *mark, u64 ino,
dev_t dev);
extern int audit_dupe_exe(struct audit_krule *new, struct audit_krule *old);
extern int audit_dupe_exe(struct audit_krule *new, struct audit_krule *old,
struct audit_watch_ctx *ctx);
extern int audit_exe_compare(struct task_struct *tsk,
struct audit_fsnotify_mark *mark);
@ -317,13 +324,13 @@ extern struct list_head *audit_killed_trees(void);
#define audit_watch_path(w) ""
#define audit_watch_compare(w, i, d) 0
#define audit_alloc_mark(k, p, l) (ERR_PTR(-EINVAL))
#define audit_alloc_mark(k, p, l, c) (ERR_PTR(-EINVAL))
#define audit_mark_path(m) ""
#define audit_remove_mark(m) do { } while (0)
#define audit_remove_mark_rule(k) do { } while (0)
#define audit_mark_compare(m, i, d) 0
#define audit_exe_compare(t, m) (-EINVAL)
#define audit_dupe_exe(n, o) (-EINVAL)
#define audit_dupe_exe(n, o, c) (-EINVAL)
#define audit_remove_tree_rule(rule) BUG()
#define audit_add_tree_rule(rule) -EINVAL

32
kernel/audit_fsnotify.c
View File

@ -71,19 +71,30 @@ static void audit_update_mark(struct audit_fsnotify_mark *audit_mark,
audit_mark->ino = inode ? inode->i_ino : AUDIT_INO_UNSET;
}
struct audit_fsnotify_mark *audit_alloc_mark(struct audit_krule *krule, char *pathname, int len)
struct audit_fsnotify_mark *audit_alloc_mark(struct audit_krule *krule, char *pathname,
int len, struct audit_watch_ctx *ctx)
{
struct audit_fsnotify_mark *audit_mark;
struct path path;
struct dentry *dentry;
int ret;
struct inode *dir, *child;
int ret, allow_dups;
if (pathname[0] != '/' || pathname[len-1] == '/')
return ERR_PTR(-EINVAL);
dentry = kern_path_parent(pathname, &path);
if (IS_ERR(dentry))
return ERR_CAST(dentry); /* returning an error */
if (!ctx) {
dentry = kern_path_parent(pathname, &path);
if (IS_ERR(dentry))
return ERR_CAST(dentry); /* returning an error */
dir = d_inode(path.dentry);
child = d_inode(dentry);
allow_dups = 0;
} else {
dir = ctx->dir;
child = ctx->child;
allow_dups = 1;
}
audit_mark = kzalloc_obj(*audit_mark);
if (unlikely(!audit_mark)) {
@ -94,18 +105,21 @@ struct audit_fsnotify_mark *audit_alloc_mark(struct audit_krule *krule, char *pa
fsnotify_init_mark(&audit_mark->mark, audit_fsnotify_group);
audit_mark->mark.mask = AUDIT_FS_EVENTS;
audit_mark->path = pathname;
audit_update_mark(audit_mark, dentry->d_inode);
audit_mark->rule = krule;
ret = fsnotify_add_inode_mark(&audit_mark->mark, path.dentry->d_inode, 0);
audit_update_mark(audit_mark, child);
ret = fsnotify_add_inode_mark(&audit_mark->mark, dir, allow_dups);
if (ret < 0) {
audit_mark->path = NULL;
fsnotify_put_mark(&audit_mark->mark);
audit_mark = ERR_PTR(ret);
}
out:
dput(dentry);
path_put(&path);
if (!ctx) {
dput(dentry);
path_put(&path);
}
return audit_mark;
}

25
kernel/audit_watch.c
View File

@ -244,7 +244,8 @@ static void audit_watch_log_rule_change(struct audit_krule *r, struct audit_watc
/* Update inode info in audit rules based on filesystem event. */
static void audit_update_watch(struct audit_parent *parent,
const struct qstr *dname, dev_t dev,
u64 ino, unsigned int invalidating)
u64 ino, unsigned int invalidating,
struct audit_watch_ctx *ctx)
{
struct audit_watch *owatch, *nwatch, *nextw;
struct audit_krule *r, *nextr;
@ -280,7 +281,7 @@ static void audit_update_watch(struct audit_parent *parent,
list_del(&oentry->rule.rlist);
list_del_rcu(&oentry->list);
nentry = audit_dupe_rule(&oentry->rule);
nentry = audit_dupe_rule(&oentry->rule, ctx);
if (IS_ERR(nentry)) {
list_del(&oentry->rule.list);
audit_panic("error updating watch, removing");
@ -479,10 +480,17 @@ static int audit_watch_handle_event(struct fsnotify_mark *inode_mark, u32 mask,
if (WARN_ON_ONCE(inode_mark->group != audit_watch_group))
return 0;
if (mask & (FS_CREATE|FS_MOVED_TO) && inode)
audit_update_watch(parent, dname, inode->i_sb->s_dev, inode->i_ino, 0);
else if (mask & (FS_DELETE|FS_MOVED_FROM))
audit_update_watch(parent, dname, AUDIT_DEV_UNSET, AUDIT_INO_UNSET, 1);
if (mask & (FS_CREATE|FS_MOVED_TO) && inode) {
struct audit_watch_ctx ctx = { .dir = dir, .child = inode };
audit_update_watch(parent, dname, inode->i_sb->s_dev, inode->i_ino, 0,
&ctx);
} else if (mask & (FS_DELETE|FS_MOVED_FROM)) {
struct audit_watch_ctx ctx = { .dir = dir, .child = NULL };
audit_update_watch(parent, dname, AUDIT_DEV_UNSET, AUDIT_INO_UNSET, 1,
&ctx);
}
else if (mask & (FS_DELETE_SELF|FS_UNMOUNT|FS_MOVE_SELF))
audit_remove_parent_watches(parent);
@ -505,7 +513,8 @@ static int __init audit_watch_init(void)
}
device_initcall(audit_watch_init);
int audit_dupe_exe(struct audit_krule *new, struct audit_krule *old)
int audit_dupe_exe(struct audit_krule *new, struct audit_krule *old,
struct audit_watch_ctx *ctx)
{
struct audit_fsnotify_mark *audit_mark;
char *pathname;
@ -514,7 +523,7 @@ int audit_dupe_exe(struct audit_krule *new, struct audit_krule *old)
if (!pathname)
return -ENOMEM;
audit_mark = audit_alloc_mark(new, pathname, strlen(pathname));
audit_mark = audit_alloc_mark(new, pathname, strlen(pathname), ctx);
if (IS_ERR(audit_mark)) {
kfree(pathname);
return PTR_ERR(audit_mark);

9
kernel/auditfilter.c
View File

@ -589,7 +589,7 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data,
err = PTR_ERR(str);
goto exit_free;
}
audit_mark = audit_alloc_mark(&entry->rule, str, f_val);
audit_mark = audit_alloc_mark(&entry->rule, str, f_val, NULL);
if (IS_ERR(audit_mark)) {
kfree(str);
err = PTR_ERR(audit_mark);
@ -816,7 +816,8 @@ static inline int audit_dupe_lsm_field(struct audit_field *df,
* rule with the new rule in the filterlist, then free the old rule.
* The rlist element is undefined; list manipulations are handled apart from
* the initial copy. */
struct audit_entry *audit_dupe_rule(struct audit_krule *old)
struct audit_entry *audit_dupe_rule(struct audit_krule *old,
struct audit_watch_ctx *ctx)
{
u32 fcount = old->field_count;
struct audit_entry *entry;
@ -875,7 +876,7 @@ struct audit_entry *audit_dupe_rule(struct audit_krule *old)
new->filterkey = fk;
break;
case AUDIT_EXE:
err = audit_dupe_exe(new, old);
err = audit_dupe_exe(new, old, ctx);
break;
}
if (err) {
@ -1414,7 +1415,7 @@ static int update_lsm_rule(struct audit_krule *r)
if (!security_audit_rule_known(r))
return 0;
nentry = audit_dupe_rule(r);
nentry = audit_dupe_rule(r, NULL);
if (entry->rule.exe)
audit_remove_mark(entry->rule.exe);
if (IS_ERR(nentry)) {