diff options
| author | Davidlohr Bueso <dave@stgolabs.net> | 2018-07-26 16:37:19 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-05 09:26:30 +0200 |
| commit | 92c159863d8afefa9ca25a180feba6bff11c2be5 (patch) | |
| tree | aab75a7b3c41841918189e1c70d4ff0efb62eecb /ipc | |
| parent | 2dd2f772257054867543c8051a174b3e1d879c2f (diff) | |
ipc/sem.c: prevent queue.status tearing in semop
[ Upstream commit f075faa300acc4f6301e348acde0a4580ed5f77c ]
In order for load/store tearing prevention to work, _all_ accesses to
the variable in question need to be done around READ and WRITE_ONCE()
macros. Ensure everyone does so for q->status variable for
semtimedop().
Link: http://lkml.kernel.org/r/20180717052654.676-1-dave@stgolabs.net
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'ipc')
| -rw-r--r-- | ipc/sem.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/ipc/sem.c b/ipc/sem.c index b2698ebdcb31..d6dd2dc9ddad 100644 --- a/ipc/sem.c +++ b/ipc/sem.c @@ -2041,7 +2041,7 @@ static long do_semtimedop(int semid, struct sembuf __user *tsops, } do { - queue.status = -EINTR; + WRITE_ONCE(queue.status, -EINTR); queue.sleeper = current; __set_current_state(TASK_INTERRUPTIBLE); |