linux-kernel - Re: [PATCH] x86: entry_32.S: change ESPFIX test to not touch PT

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Message-ID: <CALCETrVydzWCQ03=UDb4paT6y8_YULn08pgoYng8-oHF4ZAv7w@mail.gmail.com>
Date:	Mon, 9 Mar 2015 08:18:28 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Denys Vlasenko <vda.linux@...glemail.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>, Oleg Nesterov <oleg@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Will Drewry <wad@...omium.org>,
	Kees Cook <keescook@...omium.org>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: entry_32.S: change ESPFIX test to not touch PT_OLDSS(%esp)

On Mon, Mar 9, 2015 at 8:13 AM, Ingo Molnar <mingo@...nel.org> wrote:
>
> * Denys Vlasenko <vda.linux@...glemail.com> wrote:
>
>> > That being said, what ends up in the high bits of esp when we iret
>> > to vm86 mode?
>>
>> I don't know. I guess it's time to write an actual vm86 testcase :)
>
> Btw., could you please stick it and your other testcases into
> tools/x86/tests/ or so? Having such a testsuite would ease maintenance
> considerably.
>

My excuse used to be that the test actively exploited really nasty
security issues.  Then it was that I was waiting for the
infrastructure to stabilize a bit.  I'll go see how it's looking now.

--Andy

> Thanks,
>
>         Ingo



-- 
Andy Lutomirski
AMA Capital Management, LLC
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