From: Oleg Nesterov <oleg@tv-sign.ru>
Date: Wed, 15 Feb 2006 19:50:10 +0000 (+0300)
Subject: [PATCH] fix zap_thread's ptrace related problems
X-Git-Tag: v2.6.16-rc4~54
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5ecfbae093f0c37311e89b29bfc0c9d586eace87;p=pandora-kernel.git

[PATCH] fix zap_thread's ptrace related problems

1. The tracee can go from ptrace_stop() to do_signal_stop()
   after __ptrace_unlink(p).

2. It is unsafe to __ptrace_unlink(p) while p->parent may wait
   for tasklist_lock in ptrace_detach().

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Roland McGrath <roland@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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