linux-kernel - Re: [PATCH] x86_32, entry: store badsys error code in %eax

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Date:	Mon, 21 Jul 2014 10:23:25 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Sven Wegener <sven.wegener@...aler.net>,
	Richard Weinberger <richard@....at>, X86 ML <x86@...nel.org>,
	Eric Paris <eparis@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Borislav Petkov <bp@...en8.de>,
	Toralf Förster <toralf.foerster@....de>,
	stable <stable@...r.kernel.org>,
	Roland McGrath <roland@...hat.com>,
	Josh Boyer <jwboyer@...oraproject.org>
Subject: Re: [PATCH] x86_32, entry: store badsys error code in %eax

On Mon, Jul 21, 2014 at 10:20 AM, H. Peter Anvin <hpa@...or.com> wrote:
> On 07/21/2014 09:53 AM, Andy Lutomirski wrote:
>> On Sun, Jul 20, 2014 at 3:07 PM, H. Peter Anvin <hpa@...or.com> wrote:
>>> This is not a subtle regression at all.  It is in fact a very very serious one.
>>
>> Indeed.
>>
>> Does this really work correctly on sysenter?  It sure looks like the
>> sysenter path has the same problem.
>>
>> Grr.  I'm not set up to properly test 32-bit kernels.  The patch looks
>> correct, but I'm obviously not an infallible authority on "looking
>> correct" when it comes to entry_32.S.
>>
>> --Andy
>>
>
> KVM is great for that sort of things.

This may finally inspire me to teach virtme how to boot an alternate
root.  I got sick of dealing with VM images awhile ago.

--Andy

>
>         -hpa
>
>



-- 
Andy Lutomirski
AMA Capital Management, LLC
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