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

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Message-ID: <CAMzpN2jn69_E7UEP6OHBbc4r7UuJbsW50WA25YhXuQs5sHFxQQ@mail.gmail.com>
Date:	Sat, 12 Apr 2014 00:44:22 -0400
From:	Brian Gerst <brgerst@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Ingo Molnar <mingo@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
	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

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.
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