linux-kernel - Re: [PATCH v2] ptrace: unify FDPIC implementations

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Message-Id: <20100521183512.4477F40476@magilla.sf.frob.com>
Date:	Fri, 21 May 2010 11:35:12 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Mike Frysinger <vapier@...too.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-sh@...r.kernel.org, Paul Mundt <lethal@...ux-sh.org>,
	uclinux-dist-devel@...ckfin.uclinux.org,
	linux-kernel@...r.kernel.org, David Howells <dhowells@...hat.com>
Subject: Re: [PATCH v2] ptrace: unify FDPIC implementations

> This looks unsafe. What protect child->mm if ptrace() races with SIGKILL ?
> 
> Of course, I do not blame this patch, the code was copied from arch/, but
> I think we need another patch which checks ->mm != NULL under task_lock()
> on top of this one?

Agreed, unless things are somehow different on nommu so there aren't such
races.  But, as you mention, this is a long-standing issue that is entirely 
unrelated to the cleanup here and should not delay merging this patch.


Thanks,
Roland
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