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Message-Id: <1425933347-6080-1-git-send-email-mguzik@redhat.com>
Date: Mon, 9 Mar 2015 21:35:45 +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: [PATCH 0/2] avoid prepare_creds in faccessat when possible
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
fs/open.c | 53 ++++++++++++++++++++++++++++++----------------
include/linux/capability.h | 10 +++++++++
2 files changed, 45 insertions(+), 18 deletions(-)
--
1.8.3.1
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