linux-kernel - Re: [PATCH] fs/proc/: fix input sanity check.

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Message-ID: <alpine.DEB.2.00.0908121208300.27880@chino.kir.corp.google.com>
Date:	Wed, 12 Aug 2009 12:17:01 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Vincent Li <macli@....ubc.ca>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, kosaki.motohiro@...fujitsu.com,
	mel@....ul.ie, mpm@...enic.com
Subject: Re: [PATCH] fs/proc/: fix input sanity check.

On Wed, 12 Aug 2009, Vincent Li wrote:

> I re-read the clear_refs_write() in fs/proc/task_mmu.c, If I understand it 
> correctly, The old code takes  non-zero string 
> from userspace and convert it to unsigned long interger value. for 

strict_strtol() converts to long.

> example,It accepts:
> 
> echo 1 > /proc/pid/clear_refs
> echo 12foo > /proc/pid/clear_refs
> 

http://userweb.kernel.org/~akpm/mmotm/broken-out/pagemap-clear_refs-modify-to-specify-anon-or-mapped-vma-clearing.patch
changes that, so you'll need to rebase on mmotm.
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