linux-kernel - Re: [PATCH 2/2] CRED: Guard the setprocattr security hook against ptrace

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Message-ID: <alpine.LRH.2.00.0905110837270.24749@tundra.namei.org>
Date:	Mon, 11 May 2009 08:37:40 +1000 (EST)
From:	James Morris <jmorris@...ei.org>
To:	David Howells <dhowells@...hat.com>
cc:	roland@...hat.com, chrisw@...s-sol.org, oleg@...hat.com,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, eparis@...hat.com,
	sds@...ho.nsa.gov
Subject: Re: [PATCH 2/2] CRED: Guard the setprocattr security hook against
 ptrace

On Fri, 8 May 2009, David Howells wrote:

> Guard the setprocattr security hook against ptrace by taking the target task's
> cred_guard_mutex around it.  The problem is that setprocattr() may otherwise
> note the lack of a debugger, and then perform an action on that basis whilst
> letting a debugger attach between the two points.  Holding cred_guard_mutex
> across the test and the action prevents ptrace_attach() from doing that.
> 
> Signed-off-by: David Howells <dhowells@...hat.com>

Applied to 
git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6#next

-- 
James Morris
<jmorris@...ei.org>
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