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Date: Mon, 21 Jul 2014 10:20:40 -0700
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Andy Lutomirski <luto@amacapital.net>
CC: Sven Wegener <sven.wegener@stealer.net>,
        Richard Weinberger <richard@nod.at>, X86 ML <x86@kernel.org>,
        Eric Paris <eparis@redhat.com>,
        Linux Kernel <linux-kernel@vger.kernel.org>,
        Steven Rostedt <rostedt@goodmis.org>, Borislav Petkov <bp@alien8.de>,
        =?UTF-8?B?VG9yYWxmIEbDtnJzdGVy?= <toralf.foerster@gmx.de>,
        stable <stable@vger.kernel.org>, Roland McGrath <roland@redhat.com>,
        Josh Boyer <jwboyer@fedoraproject.org>
Subject: Re: [PATCH] x86_32, entry: store badsys error code in %eax
References: <alpine.LNX.2.11.1407202330420.31021@titan.int.lan.stealer.net> <90404aa5-cab6-44aa-9eab-4106cb16e7ab@email.android.com> <CALCETrUijU1f+WJ5RkOa0X1y9K1UYWEQGdVwwGfBHdVS9iBciA@mail.gmail.com>
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On 07/21/2014 09:53 AM, Andy Lutomirski wrote:
> On Sun, Jul 20, 2014 at 3:07 PM, H. Peter Anvin <hpa@zytor.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.

	-hpa