linux-kernel - Re: Q: selinux_bprm_committed_creds() && signals/do

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Date:	Wed, 29 Apr 2009 15:48:31 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	David Howells <dhowells@...hat.com>,
	Eric Paris <eparis@...isplace.org>,
	James Morris <jmorris@...ei.org>,
	Roland McGrath <roland@...hat.com>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	linux-kernel@...r.kernel.org
Subject: Re: Q: selinux_bprm_committed_creds() && signals/do_wait

> But, before fixing, I'd like to understand why we are doing
> 
> 		flush_signal_handlers(current, 1);
> 		sigemptyset(&current->blocked);

Interesting - this appear to be introducing a security hole by clearing
things daemons running setuid apps are entitled to rely upon.

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