linux-kernel - Re: [PATCH 2/4] ptrace: ensure arch_ptrace/ptrace

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Message-ID: <CA+55aFwRkvEP5YJy+a=TFgDX==YuU7CJ+D_U+B2s4e1LX-nz3g@mail.gmail.com>
Date:	Mon, 21 Jan 2013 10:27:58 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Dan Carpenter <dan.carpenter@...cle.com>,
	Kernel Security <security@...nel.org>,
	Michael Davidson <md@...gle.com>,
	Suleiman Souhlal <suleiman@...gle.com>,
	Julien Tinnes <jln@...gle.com>,
	Aaron Durbin <adurbin@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Tejun Heo <tj@...nel.org>,
	Roland McGrath <roland@...k.frob.com>,
	Tony Luck <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 2/4] ptrace: ensure arch_ptrace/ptrace_request can never
 race with SIGKILL

On Mon, Jan 21, 2013 at 9:21 AM, Oleg Nesterov <oleg@...hat.com> wrote:
>
> This is what initial patch did. But, assuming that ptrace_unfreeze_traced()
> is called unconditionally, we need a locking or barriers, otherwise

Ahh. Fair enough.

I guess that works then. It's a bit sad, but at least I see why you did it.

                  Linus
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