diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-08-16 16:48:34 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-08-16 16:48:34 -0700 |
| commit | 422ce075f969ffd650e371faa5a02586d0c0b2e6 (patch) | |
| tree | c9cbc23d3ae63eef00447a592799014e47b428cd /kernel/audit_watch.c | |
| parent | 510c8a899caf095cb13d09d203573deef15db2fe (diff) | |
| parent | b5fed474b98332559f2590c6bc90388a0899e793 (diff) | |
Merge tag 'audit-pr-20170816' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit
Pull audit fixes from Paul Moore:
"Two small fixes to the audit code, both explained well in the
respective patch descriptions, but the quick summary is one
use-after-free fix, and one silly fanotify notification flag fix"
* tag 'audit-pr-20170816' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit:
audit: Receive unmount event
audit: Fix use after free in audit_remove_watch_rule()
Diffstat (limited to 'kernel/audit_watch.c')
| -rw-r--r-- | kernel/audit_watch.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/kernel/audit_watch.c b/kernel/audit_watch.c index 62d686d96581..9eb8b3511636 100644 --- a/kernel/audit_watch.c +++ b/kernel/audit_watch.c @@ -66,7 +66,7 @@ static struct fsnotify_group *audit_watch_group; /* fsnotify events we care about. */ #define AUDIT_FS_WATCH (FS_MOVE | FS_CREATE | FS_DELETE | FS_DELETE_SELF |\ - FS_MOVE_SELF | FS_EVENT_ON_CHILD) + FS_MOVE_SELF | FS_EVENT_ON_CHILD | FS_UNMOUNT) static void audit_free_parent(struct audit_parent *parent) { @@ -457,13 +457,15 @@ void audit_remove_watch_rule(struct audit_krule *krule) list_del(&krule->rlist); if (list_empty(&watch->rules)) { + /* + * audit_remove_watch() drops our reference to 'parent' which + * can get freed. Grab our own reference to be safe. + */ + audit_get_parent(parent); audit_remove_watch(watch); - - if (list_empty(&parent->watches)) { - audit_get_parent(parent); + if (list_empty(&parent->watches)) fsnotify_destroy_mark(&parent->mark, audit_watch_group); - audit_put_parent(parent); - } + audit_put_parent(parent); } } |