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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
include/linux/sched/task.h
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@@ -85,7 +85,7 @@ static inline void exit_thread(struct task_struct *tsk)
extern __noreturn void do_group_exit(int);
extern void exit_files(struct task_struct *);
extern void exit_itimers(struct signal_struct *);
extern void exit_itimers(struct task_struct *);
extern pid_t kernel_clone(struct kernel_clone_args *kargs);
struct task_struct *create_io_thread(int (*fn)(void *), void *arg, int node);