linux-kernel - Re: [PATCH v2] sanitize task->comm to avoid leaking escape codes

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Message-ID: <20100630101329.6bc57392@lxorguk.ukuu.org.uk>
Date:	Wed, 30 Jun 2010 10:13:29 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Kees Cook <kees.cook@...onical.com>
Cc:	linux-kernel@...r.kernel.org, Greg Kroah-Hartman <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>,
	Veaceslav Falico <vfalico@...hat.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Oleg Nesterov <oleg@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Neil Horman <nhorman@...driver.com>,
	Roland McGrath <roland@...hat.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Stefani Seibold <stefani@...bold.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Eric Paris <eparis@...hat.com>,
	James Morris <jmorris@...ei.org>,
	"Andrew G. Morgan" <morgan@...nel.org>,
	Dhaval Giani <dhaval.giani@...il.com>,
	"Serge E. Hallyn" <serue@...ibm.com>,
	Steve Grubb <sgrubb@...hat.com>,
	Christoph Hellwig <hch@....de>, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v2] sanitize task->comm to avoid leaking escape codes

> What I do have interest in is fixing get_task_comm's use of buffers, which
> is theoretically problematic in some future where someone accidentally
> calls it with a buffer smaller than sizeof(task->comm).

Lots of things are theoretically problematic and kernel would take a week
to boot if we covered them all 8)

Having a 
	struct task_name {
		char [propersize];
	}

would produce the same code as far as I can tell and so typechecking
though - so as you say it can be done sanely.

Alan
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