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From: "H. Peter Anvin" <hpa@zytor.com>
To: Takashi Iwai <tiwai@suse.de>
Cc: Arjan van de Ven <arjan@infradead.org>,
	linux-kernel@vger.kernel.org, Luc Verhaegen <lverhaegen@suse.de>,
	Egbert Eich <eich@suse.de>
Subject: Re: vm86 segfaults with NX bit
Date: Thu, 20 Nov 2008 13:24:38 -0800	[thread overview]
Message-ID: <4925D596.3010304@zytor.com> (raw)
In-Reply-To: <s5hzlju8h00.wl%tiwai@suse.de>

Takashi Iwai wrote:
>>>>
>>> did the code that mapped this memory setup use PROT_EXEC ?
>> A good question...
>> Luc, Egbert, how does VESA driver handle it?
> 
> Just looking through the vesa directory of xorg-server code, PROT_EXEC
> is passed for all mappings, at least.
> 
> Please correct me if I'm looking at a wrong place...
> 

Please do an strace of the X server startup up to the point of the crash.

I am betting that PROT_EXEC is missing from an mmap(), or that it needs 
an additional mprotect().

	-hpa


  reply	other threads:[~2008-11-20 21:28 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-11-20 15:39 vm86 segfaults with NX bit Takashi Iwai
2008-11-20 15:58 ` Alan Cox
2008-11-20 16:00   ` Takashi Iwai
2008-11-20 16:05     ` Takashi Iwai
2008-11-20 16:58 ` Arjan van de Ven
2008-11-20 17:01   ` Takashi Iwai
2008-11-20 17:05     ` Takashi Iwai
2008-11-20 21:24       ` H. Peter Anvin [this message]
2008-11-21 11:38         ` Takashi Iwai
2008-11-21 17:42     ` Egbert Eich
2008-11-22 10:20       ` Takashi Iwai

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