linux-kernel - Re: [discuss] Re: [PATCH for 2.6.18-rc2] [2/8] i386/x86-64: Don't randomize stack top when no randomization personality is set II

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Message-Id: <200607162333.21640.ak@suse.de>
Date:	Sun, 16 Jul 2006 23:33:21 +0200
From:	Andi Kleen <ak@...e.de>
To:	discuss@...-64.org
Cc:	Ingo Molnar <mingo@...e.hu>, torvalds@...l.org, akpm@...l.org,
	linux-kernel@...r.kernel.org,
	Chuck Ebbert <76306.1226@...puserve.com>
Subject: Re: [discuss] Re: [PATCH for 2.6.18-rc2] [2/8] i386/x86-64: Don't randomize stack top when no randomization personality is set II


> yeah. There's one security issue: the 'dont randomize' flag must be
> cleared when we cross a protection domain. When for example suid-ing in
> exec().

Just checked. It should be already done because ADDR_NO_RANDOMIZE
is in PER_CLEAR_ON_SETID which is cleared in exec.

-Andi
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