4.14-stable review patch. If anyone has any objections, please let me know.
------------------ From: Davidlohr Bueso <d...@stgolabs.net> [ 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-d...@stgolabs.net Signed-off-by: Davidlohr Bueso <dbu...@suse.de> Cc: Manfred Spraul <manf...@colorfullife.com> Signed-off-by: Andrew Morton <a...@linux-foundation.org> Signed-off-by: Linus Torvalds <torva...@linux-foundation.org> Signed-off-by: Sasha Levin <alexander.le...@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> --- ipc/sem.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/ipc/sem.c +++ b/ipc/sem.c @@ -2041,7 +2041,7 @@ static long do_semtimedop(int semid, str } do { - queue.status = -EINTR; + WRITE_ONCE(queue.status, -EINTR); queue.sleeper = current; __set_current_state(TASK_INTERRUPTIBLE);
