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| author | Oleg Nesterov <oleg@tv-sign.ru> | 2007-08-22 14:01:37 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-08-22 19:52:46 -0700 |
| commit | d02479bdeb1c9b037892061cdcf4e730183391fa (patch) | |
| tree | 1268f3dcf973f8fc3d86c84d9b09ff9048647491 /kernel/signal.c | |
| parent | 179394af7a2baa1d0a3cb1670075310d72247d38 (diff) | |
| download | blackbird-op-linux-d02479bdeb1c9b037892061cdcf4e730183391fa.tar.gz blackbird-op-linux-d02479bdeb1c9b037892061cdcf4e730183391fa.zip | |
posix-timers: fix creation race
sys_timer_create() sets ->it_process and unlocks ->siglock, then checks
tmr->it_sigev_notify to define if get_task_struct() is needed.
We already passed ->it_id to the caller, another thread can delete this timer
and free its memory in between.
As a minimal fix, move this code under ->siglock, sys_timer_delete() takes it
too before calling release_posix_timer(). A proper serialization would be to
take ->it_lock, we add a partly initialized timer on posix_timers_id, not
good.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/signal.c')
0 files changed, 0 insertions, 0 deletions
