From 83f62a2eacb1d6945c78523f20e0c34b5d94913c Mon Sep 17 00:00:00 2001
From: Oleg Nesterov <oleg@redhat.com>
Date: Thu, 23 Jan 2014 15:55:49 -0800
Subject: [PATCH] exec:check_unsafe_exec: use while_each_thread() rather than
 next_thread()

next_thread() should be avoided, change check_unsafe_exec() to use
while_each_thread().

Nobody except signal->curr_target actually needs next_thread-like code,
and we need to change (fix) this interface.  This particular code is fine,
p == current.  But in general the code like this can loop forever if p
exits and next_thread(t) can't reach the unhashed thread.

This also saves 32 bytes.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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