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

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Message-ID: <20150309151355.GA21109@gmail.com>
Date:	Mon, 9 Mar 2015 16:13:55 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Denys Vlasenko <vda.linux@...glemail.com>
Cc:	Andy Lutomirski <luto@...capital.net>,
	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)


* 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.

Thanks,

	Ingo
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