linux-kernel - Re: bug report: mem

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Message-ID: <20060824103529.GA19854@snitselaar.org>
Date:	Thu, 24 Aug 2006 03:35:29 -0700
From:	Gerard J Snitselaar <snits@...tselaar.org>
To:	Amnon Shiloh <amnons@...huji.ac.il>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: bug report: mem_write

On  0, Amnon Shiloh <amnons@...huji.ac.il> wrote:
> Hi,
> 
> Alright, I know that "mem_write" (fs/proc/base.c) is a "security hazard",
> but I need to use it anyway (as super-user only), and find it broken,
> somewhere between Linux-2.6.17 and Linux-2.6.18-rc4.
> 
> The point is that in the beginning of the routine, "copied" is set to 0,
> but it is no good because in lines 805 and 812 it is set to other values.
> Finally, the routine returns as if it copied 12 (=ENOMEM) bytes less than
> it actually did.
> 
Is there any reason copied shouldn't get set to 0 just prior to entering
the while loop?

> Amnon.
> 
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