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authorOleg Nesterov <oleg@tv-sign.ru>2005-09-06 15:17:42 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-07 16:57:33 -0700
commite752dd6cc66a3e6a11396928998baf390cc00420 (patch)
treeb24b388d80acec6527e66b07f0d308d48319c476 /scripts/ver_linux
parenta97c9bf33f4612e2aed6f000f6b1d268b6814f3c (diff)
[PATCH] fix send_sigqueue() vs thread exit race
posix_timer_event() first checks that the thread (SIGEV_THREAD_ID case) does not have PF_EXITING flag, then it calls send_sigqueue() which locks task list. But if the thread exits in between the kernel will oops (->sighand == NULL after __exit_sighand). This patch moves the PF_EXITING check into the send_sigqueue(), it must be done atomically under tasklist_lock. When send_sigqueue() detects exiting thread it returns -1. In that case posix_timer_event will send the signal to thread group. Also, this patch fixes task_struct use-after-free in posix_timer_event. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'scripts/ver_linux')
0 files changed, 0 insertions, 0 deletions

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