From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mateusz Guzik <mguzik@redhat.com>
Subject: Re: [PATCH 0/2] avoid prepare_creds in faccessat when possible
Date: Fri, 13 Mar 2015 13:08:17 +0100
Message-ID: <20150313120816.GA2527@mguzik>
References: <1425933347-6080-1-git-send-email-mguzik@redhat.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8
Cc: Paul Moore <pmoore@redhat.com>, Eric Paris <eparis@redhat.com>,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-security-module@vger.kernel.org
To: Alexander Viro <viro@zeniv.linux.org.uk>,
	Serge Hallyn <serge.hallyn@canonical.com>
Return-path: <linux-kernel-owner@vger.kernel.org>
Content-Disposition: inline
In-Reply-To: <1425933347-6080-1-git-send-email-mguzik@redhat.com>
Sender: linux-kernel-owner@vger.kernel.org
List-Id: linux-fsdevel.vger.kernel.org

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