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

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Message-ID: <6f5f98f2-aa96-433f-9ee8-5ba216624957@email.android.com>
Date:	Sat, 12 Apr 2014 10:18:25 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Brian Gerst <brgerst@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	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

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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