ipc/sem: avoid ipc_rcu_alloc()
authorKees Cook <keescook@chromium.org>
Wed, 12 Jul 2017 21:35:02 +0000 (14:35 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 12 Jul 2017 23:26:01 +0000 (16:26 -0700)
commit101ede01dfd5072651965e974bc6e30c8d0748e2
treede85b9884a50812354b9f9ccdc3193a30239fa4d
parent5ccc8fb54f1c083f1dc7e073150ec18d43457872
ipc/sem: avoid ipc_rcu_alloc()

Instead of using ipc_rcu_alloc() which only performs the refcount bump,
open code it to perform better sem-specific checks.  This also allows
for sem_array structure layout to be randomized in the future.

[manfred@colorfullife.com: Rediff, because the memset was temporarily inside ipc_rcu_alloc()]
Link: http://lkml.kernel.org/r/20170525185107.12869-10-manfred@colorfullife.com
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
ipc/sem.c