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

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Message-ID: <87ppkmhrbq.fsf@tassilo.jf.intel.com>
Date:	Sat, 12 Apr 2014 19:54:33 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Brian Gerst <brgerst@...il.com>, 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

Linus Torvalds <torvalds@...ux-foundation.org> writes:

> On Fri, Apr 11, 2014 at 11:27 AM, Brian Gerst <brgerst@...il.com> 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.
>
> Ok, so you actually do this on x86-64, and it currently works? For
> some reason I thought that 16-bit windows apps already didn't work.

No, it always worked. I spent some time on this early in the x86-64 port
and it flushed out some bugs in the early segment handling. x86-64 
is perfectly compatible to this.

Also was always proud that Linux 64 was more compatible old Windows
binaries than Win 64...

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
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