linux-kernel - Re: [PATCH] SGI UV: uv_ptc_proc

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Date:	Mon, 23 Jun 2008 23:13:35 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Cliff Wickman <cpw@....com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] SGI UV: uv_ptc_proc_write security hole


* Cliff Wickman <cpw@....com> wrote:

> From: Cliff Wickman <cpw@....com>
> 
> Someone could write 0 bytes to /proc/sgi_uv/ptc_statistics,
> causing
>   optstr[count - 1] = '\0';
> to write to who-knows-where.
> 
> (Andi Kleen noticed this need from a patch I sent for
>  similar code in the ia64 world (sn2_ptc_proc_write()).)
> 
> (count less than zero is not possible here, as count is unsigned)
> 
> Diffed against 2.6.26-rc6

applied to tip/x86/uv - thanks Cliff.

	Ingo
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