linux-kernel - Re: [tip:x86/urgent] x86-64, modify_ldt: Ban 16-bit segments on 64-bit kernels

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Date:	Sat, 12 Apr 2014 16:29:48 -0400
From:	Brian Gerst <brgerst@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	stable <stable@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
Subject: Re: [tip:x86/urgent] x86-64, modify_ldt: Ban 16-bit segments on
 64-bit kernels

For this particular game, not 16-bit in general.   The installer, also
16-bit, runs perfectly.  Already filed wine bug 35977.

On Sat, Apr 12, 2014 at 1:18 PM, H. Peter Anvin <hpa@...or.com> wrote:
> So Wine regressed and noone noticed? They doesn't sound like an active user base.
>
> On April 11, 2014 9:44:22 PM PDT, Brian Gerst <brgerst@...il.com> wrote:
>>On Fri, Apr 11, 2014 at 2:50 PM, Linus Torvalds
>><torvalds@...ux-foundation.org> wrote:
>>> On Fri, Apr 11, 2014 at 11:45 AM, Brian Gerst <brgerst@...il.com>
>>wrote:
>>>>
>>>> I haven't tested it recently but I do know it has worked on 64-bit
>>>> kernels.  There is no reason for it not to, the only thing not
>>>> supported in long mode is vm86.  16-bit protected mode is unchanged.
>>>
>>> Afaik 64-bit windows doesn't support 16-bit binaries, so I just
>>> assumed Wine wouldn't do it either on x86-64. Not for any real
>>> technical reasons, though.
>>>
>>> HOWEVER. I'd like to hear something more definitive than "I haven't
>>> tested recently". The "we don't break user space" is about having
>>> actual real *users*, not about test programs.
>>>
>>> Are there people actually using 16-bit old windows programs under
>>> wine? That's what matters.
>>>
>>>                 Linus
>>
>>I just verified that the game does still run on a 64-bit kernel
>>(3.13.8-200.fc20.x86_64).  It needed an older version of Wine, but
>>that's a Wine regression and not kernel related.
>
> --
> Sent from my mobile phone.  Please pardon brevity and lack of formatting.
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