linux-kernel - Re: [PATCH 2/4] x86: Fix the hw

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Date:	Tue, 26 Nov 2013 19:09:41 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>, stable@...r.kernel.org
Subject: Re: [PATCH 2/4] x86: Fix the hw_breakpoint range check

On 11/25, Borislav Petkov wrote:
>
> On Mon, Nov 25, 2013 at 08:50:28PM +0100, Oleg Nesterov wrote:
> > This won't work if va + len overflows?
>
> Oh, right,
>
> > Perhaps we should makes this clear, and we can even check the overflow
> > in the generic code (iirc Linus suggested to do this).
>
> maybe something like
>
> 	((va + len - 1) >= TASK_SIZE) || ((va + len - 1) < va)

Yes. But again, it makes sense to do this in the caller. And kill
the stupid get_hbp_len(). And other cleanups.

But this patch just tries to fix the typo in the security check.

Oleg.

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