linux-kernel - Re: [patch] x86: rename is_at_popf(), add iret to tests and fix insn length

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Message-Id: <E1G8OHm-0000m3-91@be1.lrz>
Date:	Wed, 02 Aug 2006 23:29:30 +0200
From:	Bodo Eggert <7eggert@...tempel.de>
To:	Andi Kleen <ak@...e.de>, Chuck Ebbert <76306.1226@...puserve.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...l.org>
Subject: Re: [patch] x86: rename is_at_popf(), add iret to tests and fix insn length

Andi Kleen <ak@...e.de> wrote:
> On Wednesday 02 August 2006 14:37, Chuck Ebbert wrote:

>> is_at_popf() needs to test for the iret instruction as well as
>> popf.  So add that test and rename it to is_setting_trap_flag().
> 
> Do you have a single real example where anybody is actually using IRET
> in user space?

It might be used by malicious software, so unless it can't be abused,
it must be checked.
-- 
Ich danke GMX dafür, die Verwendung meiner Adressen mittels per SPF
verbreiteten Lügen zu sabotieren.

http://david.woodhou.se/why-not-spf.html
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