linux-kernel - Re: [PATCH] x86: Clear DF before calling signal handler

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Message-ID: <47CEE3C1.8060304@zytor.com>
Date:	Wed, 05 Mar 2008 10:17:37 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Aurelien Jarno <aurelien@...el32.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: Clear DF before calling signal handler

Aurelien Jarno wrote:
> The Linux kernel currently does not clear the direction flag before
> calling a signal handler, whereas the x86/x86-64 ABI requires that.
> This become a real problem with gcc version 4.3, which assumes that
> the direction flag is correctly cleared at the entry of a function.
> 
> This patches changes the setup_frame() functions to clear the
> direction before entering the signal handler.
> 
> Signed-off-by: Aurelien Jarno <aurelien@...el32.net>

Acked-by: H. Peter Anvin <hpa@...or.com>

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