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

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Message-ID: <CAMzpN2jVAZS61uicMRbyR45PrL+WBKNWH52DN_E3CYaCcOAjWg@mail.gmail.com>
Date:	Fri, 11 Apr 2014 14:35:05 -0400
From:	Brian Gerst <brgerst@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>, 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 2:29 PM, H. Peter Anvin <hpa@...or.com> wrote:
> On 04/11/2014 11:27 AM, Brian Gerst wrote:
>> Is this bug really still present in modern CPUs?  This change breaks
>> running 16-bit apps in Wine.  I have a few really old games I like to
>> play on occasion, and I don't have a copy of Win 3.11 to put in a VM.
>
> It is not a bug, per se, but an architectural definition issue, and it
> is present in all x86 processors from all vendors.
>
> Yes, it does break running 16-bit apps in Wine, although Wine could be
> modified to put 16-bit apps in a container.  However, this is at best a
> marginal use case.


Marginal or not, it is still userspace breakage.
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