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

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Message-ID: <53483487.6030103@zytor.com>
Date:	Fri, 11 Apr 2014 11:29:27 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Brian Gerst <brgerst@...il.com>, 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 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.

	-hpa

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