Re: vm86 segfaults with NX bit
- From: Takashi Iwai <tiwai@xxxxxxx>
- Date: Thu, 20 Nov 2008 18:05:51 +0100
At Thu, 20 Nov 2008 18:01:08 +0100,
I wrote:
At Thu, 20 Nov 2008 08:58:44 -0800,
Arjan van de Ven wrote:
On Thu, 20 Nov 2008 16:39:06 +0100
Takashi Iwai <tiwai@xxxxxxx> wrote:
Hi,
X guys reported that VESA driver segfaults in vm86 mode with a kernel
with CONFIG_X86_PAE, and it turned to be the NX bit. See Novell
bugzilla #443440:
https://bugzilla.novell.com/show_bug.cgi?id=443440
I can confirm that the latest 2.6.28-rc still causes the same problem,
and it disappears when booted with noexec=off option.
Also, when NX bit is reset for the first 1MB (or smaller) in
do_sys_vm86(), it also works as expected. But I have little clue
where to restore the bit again.
Any good suggestions / solutions?
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...
thanks,
Takashi
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