linux-kernel - Re: [PATCH] x86-64, espfix: Don't leak bits 31:16 of %esp returning to 16-bit stack

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Message-ID: <5361224C.80702@linux.intel.com>
Date:	Wed, 30 Apr 2014 09:18:20 -0700
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	Borislav Petkov <bp@...en8.de>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Andrew Lutomriski <amluto@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dirk Hohndel <dirk@...ndel.org>,
	Arjan van de Ven <arjan.van.de.ven@...el.com>,
	comex <comexk@...il.com>,
	Alexander van Heukelum <heukelum@...tmail.fm>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: Re: [PATCH] x86-64, espfix: Don't leak bits 31:16 of %esp returning
 to 16-bit stack

On 04/30/2014 03:38 AM, Borislav Petkov wrote:
> 
> What will happen more likely and thus more often - our "simulated" #DF
> or a real one? Judging by the order of the tests, you're saying: the
> simulated one. :-)
> 
> Otherwise, push the __KERNEL_CS test up?
> 

Doesn't matter, really: do_double_fault is unconditionally fatal.

	-hpa


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