RE: [coLinux-users] Newbie question: linux.sys causing a BSOD

[Steve F. <ste...@be...>]

I'd be glad to help out any way I can.  Feel free to email me
anytime--just let me know what I need to do.

=20
Thanks!

Steve


-----Original Message-----
From: Nuno Lucas [mailto:lu...@nl...]=20
Sent: Wednesday, September 15, 2004 4:48 PM
To: Steve Frank
Cc: col...@li...
Subject: Re: [coLinux-users] Newbie question: linux.sys causing a BSOD

Hi Steve,

Just to let you know you have been noticed and I forwarded your mail to
the developers list.

This was more or less expected and I'm sorry I didn't catch the
SP2/Amd64 magic combination on your first mail, at least to speed the
reason finding, if not the short term solution.

What I wasn't expecting was the BSoD. That is a serious problem indeed.

Dan Aloni, the one who understands all the code (because he wrote it ;),
is in Japan right now, doing some lecturers for CoLinux, but I'm sure he
will make everything possible to solve your case. The only problem would
be for him to get the time to do it.

It would be great if you could offer for testing a possible fix, as not
everyone has an adequate machine for that :)

Best Regards,
~Nuno Lucas


Steve Frank, dando pulos de alegria, escreveu :
> Okay, I figured this out and I'll post it here so if others see this=20
> happen.
>=20
> The problem is due to the combination of Windows XP SP2 with DEP=20
> enabled on an Athlon64 processor.  After trying combination after=20
> combination and seeing a ton of blue screens, I was able to get=20
> coLinux to operate by changing the /NoExecute to be AlwaysOff in my
boot.ini.
>=20
> I consider this a little bit of a bug with coLinux, and it's bitten=20
> the DivX encoder too on this processor.
>=20
> DEP =3D Data Execution Prevention, which basically enables the =
flagging=20
> of memory as being non-executable, thereby preventing injected code=20
> from being run if pushed in via a buffer overrun.  Lots of details are

> here at Microsoft's site:
>
http://www.microsoft.com/technet/prodtechnol/winxppro/maintain/sp2mempr.
> mspx
>=20
> Something in coLinux isn't playing nice with this, and I end up with a

> STOP error everytime I start up the app.  I tried flagging just the=20
> colinux-daemon.exe to be bypassed with this stuff, but it still=20
> BSOD'd, probably because of something in the linux.sys because it was=20
> not flagged to run without DEP.  I had to disable it for the entire
OS.
> This isn't really desirable from a security perspective long term, but

> short term it really doesn't make my machine less secure than when I=20
> was running service pack 1, because SP1 didn't enable this capability=20
> in the first place.
>=20
> FWIW, on my work machine, a Pentium4 desktop, this doesn't crash. DEP=20
> is enforced by the OS, not relying on the underlying hardware to do=20
> it, since DEP isn't available on this processor, and according to the=20
> above
> link:  By default, software-enforced DEP only protects limited system=20
> binaries, regardless of the hardware-enforced DEP capabilities of the=20
> processor.  I'm curious if the OS considers linux.sys to be part of=20
> the OS or not?
>=20
> I believe the new E64MT Pentium 4 procs have this enabled, so this=20
> problem may or may not appear on that platform.  With more people=20
> moving towards the Athlon64 processors (they are getting cheaper now),

> this problem might affect more coLinux people in the near future.
>=20
> Thanks, hope this helps others!
>=20
> Steve
>=20
>=20
>>-----Original Message-----
>>From: col...@li...
>>[mailto:col...@li...] On Behalf Of Steve=20
>>Frank
>>Sent: Saturday, September 11, 2004 3:27 PM
>>To: col...@li...
>>Subject: [coLinux-users] Newbie question: linux.sys causing a BSOD
>>
>>Hi, I'm getting a STOP error (Blue scree o' death) whenever I try to=20
>>start up colinux, with the failure on the linux.sys driver. I'm on XP
>>SP2 (and it works on another SP2 machine fine).  Immediately on=20
>>startup a 0x8e error occurs, so this is a no go.  The system is an=20
>>Athlon64 with a Via KT800Pro chipset, if that matters. Any ideas?
>>
>>=20
>>
>>Steve
>>
>>=20
>>
>>
>>
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>=20
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>=20
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