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| author | Manfred Spraul <manfred@colorfullife.com> | 2018-08-21 22:01:37 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-08-22 10:52:52 -0700 |
| commit | 2e5ceb452c9b7f0a30c87bd61c01260e3d8464ad (patch) | |
| tree | b4a999c84f6a8935a46a35d741ef07968a9a330c /ipc | |
| parent | 4241c1a304078569f544d51eeaf8bc270b6e377a (diff) | |
| download | lwn-2e5ceb452c9b7f0a30c87bd61c01260e3d8464ad.tar.gz lwn-2e5ceb452c9b7f0a30c87bd61c01260e3d8464ad.zip | |
ipc/util.c: correct comment in ipc_obtain_object_check
The comment that explains ipc_obtain_object_check is wrong: The function
checks the sequence number, not the reference counter.
Note that checking the reference counter would be meaningless: The
reference counter is decreased without holding any locks, thus an object
with kern_ipc_perm.deleted=true may disappear at the end of the next rcu
grace period.
Link: http://lkml.kernel.org/r/20180712185241.4017-6-manfred@colorfullife.com
Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Reviewed-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Kees Cook <keescook@chromium.org>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc')
| -rw-r--r-- | ipc/util.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/ipc/util.c b/ipc/util.c index 1d88dffd75e7..dcb437095cbd 100644 --- a/ipc/util.c +++ b/ipc/util.c @@ -629,8 +629,8 @@ err: * @ids: ipc identifier set * @id: ipc id to look for * - * Similar to ipc_obtain_object_idr() but also checks - * the ipc object reference counter. + * Similar to ipc_obtain_object_idr() but also checks the ipc object + * sequence number. * * Call inside the RCU critical section. * The ipc object is *not* locked on exit. |