linux-kernel - Re: [PATCH] kill an obsolete sub-thread-ptrace stuff

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Message-Id: <20070803215101.481DD4D04BC@magilla.localdomain>
Date:	Fri,  3 Aug 2007 14:51:01 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kill an obsolete sub-thread-ptrace stuff

> There is a couple of subtle checks which were needed to handle ptracing from
> the same thread group. This was deprecated a long ago, imho this code just
> complicates the understanding.

Looks ok to me.

> And, the "->parent->signal->flags & SIGNAL_GROUP_EXIT" check in exit_notify()
> is not right. SIGNAL_GROUP_EXIT can mean exec(), not exit_group(). This means
> ptracer can lose a ptraced zombie on exec(). Minor problem, but still the bug.

This bug never happens because this check is only in the now-impossible
ptrace-same-group case.  The code can certainly go.


Thanks,
Roland
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