Commit e0e8eb54 authored by Eric W. Biederman's avatar Eric W. Biederman Committed by Linus Torvalds

[PATCH] unshare: Use rcu_assign_pointer when setting sighand

The sighand pointer only needs the rcu_read_lock on the
read side.  So only depending on task_lock protection
when setting this pointer is not enough.  We also need
a memory barrier to ensure the initialization is seen first.

Use rcu_assign_pointer as it does this for us, and clearly
documents that we are setting an rcu readable pointer.
Signed-off-by: default avatarEric W. Biederman <ebiederm@xmission.com>
Acked-by: default avatarPaul E. McKenney <paulmck@us.ibm.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 232a347a
......@@ -1569,7 +1569,7 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
if (new_sigh) {
sigh = current->sighand;
current->sighand = new_sigh;
rcu_assign_pointer(current->sighand, new_sigh);
new_sigh = sigh;
}
......
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