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23 October 2021, 00:29:24 UTC
Revision e8577d1f0329d4842e8302e289fb2c22156abef4 authored by Manfred Spraul on 02 December 2014, 23:59:34 UTC, committed by Linus Torvalds on 03 December 2014, 17:36:03 UTC 
ipc/sem.c: fully initialize sem_array before making it visible
 
ipc_addid() makes a new ipc identifier visible to everyone.  New objects
start as locked, so that the caller can complete the initialization
after the call.  Within struct sem_array, at least sma->sem_base and
sma->sem_nsems are accessed without any locks, therefore this approach
doesn't work.

Thus: Move the ipc_addid() to the end of the initialization.

Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Reported-by: Rik van Riel <riel@redhat.com>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Davidlohr Bueso <dave@stgolabs.net>
Acked-by: Rafael Aquini <aquini@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 92788ac
History
Tip revision: e8577d1f0329d4842e8302e289fb2c22156abef4 authored by Manfred Spraul on 02 December 2014, 23:59:34 UTC
ipc/sem.c: fully initialize sem_array before making it visible
Tip revision: e8577d1
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.gitignore -rw-r--r-- 1.1 KB
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COPYING -rw-r--r-- 18.3 KB
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