linux-kernel - Re: [PATCH] signals: check_kill_permission: don't check creds if same_thread

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Message-ID: <2996.1274172907@redhat.com>
Date:	Tue, 18 May 2010 09:55:07 +0100
From:	David Howells <dhowells@...hat.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	dhowells@...hat.com, Andrew Morton <akpm@...ux-foundation.org>,
	Andrew Tridgell <tridge@...ba.org>,
	Eric Paris <eparis@...isplace.org>,
	Jakub Jelinek <jakub@...hat.com>,
	James Morris <jmorris@...ei.org>,
	Roland McGrath <roland@...hat.com>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] signals: check_kill_permission: don't check creds if same_thread_group()

Oleg Nesterov <oleg@...hat.com> wrote:

> Also, move "cred = current_cred()" down to avoid calling get_current()
> twice.

I don't see what you mean by this.  same_thread_group() doesn't call
current_cred(), so why this change?

David
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