linux-kernel - Re: [PATCH 0/2] avoid prepare_creds in faccessat when possible

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Message-ID: <20150313120816.GA2527@mguzik>
Date:	Fri, 13 Mar 2015 13:08:17 +0100
From:	Mateusz Guzik <mguzik@...hat.com>
To:	Alexander Viro <viro@...iv.linux.org.uk>,
	Serge Hallyn <serge.hallyn@...onical.com>
Cc:	Paul Moore <pmoore@...hat.com>, Eric Paris <eparis@...hat.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org
Subject: Re: [PATCH 0/2] avoid prepare_creds in faccessat when possible

On Mon, Mar 09, 2015 at 09:35:45PM +0100, Mateusz Guzik wrote:
> Sometimes faccessat needs to modify current thread's credentials, but
> calls prepare_creds unconditionally.
> 
> However, typically resulting credentials are identical to original ones
> and in that case newcredentials are unnecessary. We can detect this before
> allocating anything.
> 
> This patch series adds a helper which allows comparing capability sets and
> modifies faccessat to use it.
> 
> Mateusz Guzik (2):
>   CAPABILITIES: add cap_isequal helper
>   fs: avoid unnecessary prepare_creds in faccessat
> 

Can I get some (N)ACKs on this one?

Thanks,
-- 
Mateusz Guzik
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