From: Oleg Nesterov <oleg@redhat.com>
Date: Thu, 2 Apr 2009 23:58:23 +0000 (-0700)
Subject: ptrace_untrace: fix the SIGNAL_STOP_STOPPED check
X-Git-Tag: v2.6.30-rc1~322
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1ee1184485df9c9a3503d3a684b911fb7c73d259;p=pandora-kernel.git

ptrace_untrace: fix the SIGNAL_STOP_STOPPED check

This bug is ancient too. ptrace_untrace() must not resume the task
if the group stop in progress, we should set TASK_STOPPED instead.

Unfortunately, we still have problems here:

	- if the process/thread was traced, SIGNAL_STOP_STOPPED
	  does not necessary means this thread group is stopped.

	- ptrace breaks the bookkeeping of ->group_stop_count.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Jerome Marchand <jmarchan@redhat.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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