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audit/stable-4.13 PR 20170816

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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()
This commit is contained in:
Linus Torvalds 2017-08-16 16:48:34 -07:00
commit 422ce075f9
1 changed files with 8 additions and 6 deletions
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14
kernel/audit_watch.c
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@ -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);
}
}