linux-kernel - Re: [PATCH] CRED: Take cred_exec_mutex in compat_do_execve() and fix error handling in do

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Date:	Wed, 20 Aug 2008 09:29:50 +1000 (EST)
From:	James Morris <jmorris@...ei.org>
To:	David Howells <dhowells@...hat.com>
cc:	a.beregalov@...il.com, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH] CRED: Take cred_exec_mutex in compat_do_execve() and
 fix error handling in do_execve()

On Tue, 19 Aug 2008, David Howells wrote:

> Take cred_exec_mutex in compat_do_execve().  This reflects what do_execve()
> does.  The mutex protects credentials calculation against PTRACE_ATTACH needing
> to alter it mid-exec.
> 
> Also fix the error handling in do_execve().  The mutex needs to be unlocked if
> an error occurs after it is taken, but before the install_exec_creds()
> released it.
> 
> 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-creds

Hopefully this will be in the next linux-next tree for testing.

Alexander, please let us know if it fixes the problem you saw.


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