linux-kernel - Re: [PATCH 3.2 055/152] x86_64, switch_to(): Load TLS descriptors before switching DS and ES

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Message-ID: <CAK1hOcPXLwf06U-xiRHs0mHh1iFvPHBVpm6XRJ75T5TC5Z7TYA@mail.gmail.com>
Date:	Tue, 24 Feb 2015 21:08:28 +0100
From:	Denys Vlasenko <vda.linux@...glemail.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Ben Hutchings <ben@...adent.org.uk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	stable <stable@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 3.2 055/152] x86_64, switch_to(): Load TLS descriptors
 before switching DS and ES

On Tue, Feb 24, 2015 at 9:02 PM, Andy Lutomirski <luto@...capital.net> wrote:
>> This currently fails in 32-bit kernels (at least in qemu):
>>
>> / # ./es_test
>> Allocated GDT index 7
>> [FAIL]    ES changed from 0x3b to 0x7b
>> [FAIL]    ES was corrupted 1000/1000 times
>> / # uname -a
>> Linux (none) 4.0.0-rc1 #1 SMP Tue Feb 24 16:41:58 CET 2015 i686 GNU/Linux
>
> Want to send a patch?  I'll get it in a few days if no one beats me.

I have no patch, sorry (in fact, I failed to find where is the relevant
32-bit counterpart).

It's just security people asked me to backport this and I wondered
maybe I should wait a bit on this one, since fix for 32-bit ought
to appear as well.
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