linux-kernel - Re: [PATCH] sanitize task->comm to avoid leaking escape codes

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Message-ID: <AANLkTinlrnSEwnWn_qcvdfqXM6b_bA3hbBjBrqgpQnKX@mail.gmail.com>
Date:	Tue, 29 Jun 2010 11:45:14 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Kees Cook <kees.cook@...onical.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Neil Horman <nhorman@...driver.com>,
	Roland McGrath <roland@...hat.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] sanitize task->comm to avoid leaking escape codes

On Tue, Jun 29, 2010 at 12:03 AM, Kees Cook <kees.cook@...onical.com> wrote:
> On Mon, Jun 28, 2010 at 01:00:28PM -0700, Andrew Morton wrote:
>> Surely it would be better to fix the tools which display this info
>> rather than making the kernel tell fibs.
>
> The strncpy in get_task_comm() is totally wrong -- it's testing the length
> of task->comm.

It also fills not just any buffer but buffer which is TASK_COMM_LEN byte wide.

> Why should get_task_comm not take a destination buffer length argument?

If you pass too small, you needlessly truncate output.
If you pass too large, you waste space.
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