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

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Message-Id: <201006292022.53834.sgrubb@redhat.com>
Date:	Tue, 29 Jun 2010 20:22:52 -0400
From:	Steve Grubb <sgrubb@...hat.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Stefani Seibold <stefani@...bold.net>,
	Kees Cook <kees.cook@...onical.com>,
	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>,
	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>,
	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>,
	Christoph Hellwig <hch@....de>, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v2] sanitize task->comm to avoid leaking escape codes

On Tuesday, June 29, 2010 08:16:08 pm KOSAKI Motohiro wrote:
> > For the audit system, we want the real, unsanitized task->comm. We record
> > it  in a special format to the audit logs such that unprintable
> > characters are included. We want it exactly this way for certification
> > purposes as well as forensic evidence if someone was playing games. If
> > you do sanitize it for other areas of the kernel, please give us a way
> > to get the unsanitized text.
> 
> Probably this mail is offtopic. I think audit is unrelated with this
> discusstion. because when  forensic, admins shouldn't believe task->comm
> at all. because 1) no path information, perhaps "ls" might mean
> "/home/attackers-dir/evil-script/ls" 2) easily obscured by
> prctl(PR_SET_NAME).

No, its on-topic and we want that information unchanged.


> That said, audit have to logged following two point if task name is
> necessary. 1) exec
> 2) prctl(PRT_SET_NAME)
> 
> Thought ?

The audit system is capable of grabbing that information, too.

-Steve
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