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

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Message-ID: <53483260.2020308@zytor.com>
Date:	Fri, 11 Apr 2014 11:20:16 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andy Lutomirski <luto@...capital.net>, mingo@...nel.org,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	tglx@...utronix.de, stable@...r.kernel.org, hpa@...ux.intel.com,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/urgent] x86-64, modify_ldt:  Ban 16-bit segments on
 64-bit kernels

On 04/11/2014 11:12 AM, Andy Lutomirski wrote:
> 
> If this is what I think it is (hi, Spender), then it is probably only
> useful for 3.14.y and not earlier kernels.
> 

Not really.  The kernel stack address is sensitive regardless of kASLR;
in fact, it is completely orthogonal to kASLR.

	-hpa


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