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

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Message-ID: <53486A30.80909@zytor.com>
Date:	Fri, 11 Apr 2014 15:18:24 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andy Lutomirski <luto@...capital.net>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
CC:	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
Subject: Re: [tip:x86/urgent] x86-64, modify_ldt: Ban 16-bit segments on 64-bit
 kernels

On 04/11/2014 03:15 PM, Andy Lutomirski wrote:
> 
> I just looked up my hideous code.  I was doing this to test the
> now-deleted int 0xcc vsyscall stuff.  I used modify_ldt because either
> I didn't realize that __USER32_CS was usable or I didn't think it was
> ABI.  Or I was just being silly.
> 
> But yes, breaking my hack would not matter. :)
> 

Either way, it wouldn't break it.

	-hpa


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