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| author | Davidlohr Bueso <dave@stgolabs.net> | 2018-07-27 01:37:19 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-07-27 04:38:03 +0200 |
| commit | f075faa300acc4f6301e348acde0a4580ed5f77c (patch) | |
| tree | f2463b201b1785fd6af3cdd52bcf932267a85e92 /ipc/sem.c | |
| parent | mm: disallow mappings that conflict for devm_memremap_pages() (diff) | |
| download | linux-f075faa300acc4f6301e348acde0a4580ed5f77c.tar.xz linux-f075faa300acc4f6301e348acde0a4580ed5f77c.zip | |
ipc/sem.c: prevent queue.status tearing in semop
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>
Diffstat (limited to 'ipc/sem.c')
| -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 5af1943ad782..76e95e4f3aa2 100644 --- a/ipc/sem.c +++ b/ipc/sem.c @@ -2118,7 +2118,7 @@ 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); |