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fix race between exit_itimers() and /proc/pid/timers

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As Chris explains, the comment above exit_itimers() is not correct,
we can race with proc_timers_seq_ops. Change exit_itimers() to clear
signal->posix_timers with ->siglock held.

Cc: <stable@vger.kernel.org>
Reported-by: chris@accessvector.net
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2022-07-11 18:16:25 +02:00 • committed by Linus Torvalds
parent 32346491dd
commit d5b36a4dbd
4 changed files with 17 additions and 8 deletions
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2
fs/exec.c
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@ -1301,7 +1301,7 @@ int begin_new_exec(struct linux_binprm * bprm)
bprm->mm = NULL;
#ifdef CONFIG_POSIX_TIMERS
exit_itimers(me->signal);
exit_itimers(me);
flush_itimer_signals();
#endif