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

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Message-ID: <536A68B1.6070500@zytor.com>
Date:	Wed, 07 May 2014 10:09:05 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Sven Joachim <svenjoac@....de>
CC:	Alexandre Julliard <julliard@...ehq.org>,
	Brian Gerst <brgerst@...il.com>,
	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

On 05/07/2014 09:57 AM, Linus Torvalds wrote:
> 
> Afaik, 16-bit programs under wine already need
> 
>   echo 0 > /proc/sys/vm/mmap_min_addr
> 
> because they want to map things at address 0, so this isn't a new concept.
> 

I think that applies to DOSEMU, but not to Wine.

Sven: if you have the ability to build your own kernel, could you also
try the "x86/espfix" branch of the git tree:

https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git/

(clone URLs:)
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git

... to make sure the proper solution works for you?

I'm somewhat curious if this program you have is actually a 32-bit
program or if it is really a 16-bit program wrapped in a 32-bit
installer of some kind.  Hard to know without seeing the program in
question.

	-hpa

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