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ipc/util.c: correct comment in ipc_obtain_object_check

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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/[email protected]
Signed-off-by: Manfred Spraul <[email protected]>
Reviewed-by: Davidlohr Bueso <[email protected]>
Cc: Davidlohr Bueso <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Cc: Herbert Xu <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Michael Kerrisk <[email protected]>
Cc: Michal Hocko <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Manfred Spraul 2018-08-21 22:01:37 -07:00 • committed by Linus Torvalds
commit 2e5ceb452c
1 changed files with 2 additions and 2 deletions
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4
ipc/util.c
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@ -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.