linux-kernel - Re: [PATCH 0/1] (Was: Linux 3.11-rc4)

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Message-ID: <20130807192734.GA8395@redhat.com>
Date:	Wed, 7 Aug 2013 21:27:34 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Grazvydas Ignotas <notasas@...il.com>,
	Felipe Contreras <felipe.contreras@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Denys Vlasenko <dvlasenk@...hat.com>
Subject: Re: [PATCH 0/1] (Was: Linux 3.11-rc4)

On 08/07, Linus Torvalds wrote:
>
> It's a security issue: setting debug traps on kernel code/data
> addresses can not only leak information, it can cause serious trouble
> (taking a debug trap on the first instruction of an NMI handler etc)
> including kernel stack corruption...

I guess Grazvydas only meant the "unnecessary" align/len/type checks.

But you are right of course.

Oleg.

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