tree f8d9d21cbc43ac12a67bbc428cab083adb31cd30
parent f42569b1388b1408b574a5e93a23a663647d4181
author Davidlohr Bueso <davidlohr.bueso@hp.com> 1378934783 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1378940382 -0700

ipc,shm: shorten critical region for shmat

Similar to other system calls, acquire the kern_ipc_perm lock after doing
the initial permission and security checks.

[sasha.levin@oracle.com: dont leave do_shmat with rcu lock held]
Signed-off-by: Davidlohr Bueso <davidlohr.bueso@hp.com>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>