linux-kernel - Re: [Regression v4.2 ?] 32-bit seccomp-BPF returned errno values wrong in VM?

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Message-ID: <55CDD7CE.5070503@redhat.com>
Date:	Fri, 14 Aug 2015 13:58:06 +0200
From:	Denys Vlasenko <dvlasenk@...hat.com>
To:	Andy Lutomirski <luto@...capital.net>,
	Kees Cook <keescook@...omium.org>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Drysdale <drysdale@...gle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Will Drewry <wad@...omium.org>, Ingo Molnar <mingo@...nel.org>,
	Alok Kataria <akataria@...are.com>,
	Borislav Petkov <bp@...en8.de>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>, Oleg Nesterov <oleg@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>, X86 ML <x86@...nel.org>
Subject: Re: [Regression v4.2 ?] 32-bit seccomp-BPF returned errno values
 wrong in VM?

On 08/14/2015 12:59 AM, Andy Lutomirski wrote:
> On Thu, Aug 13, 2015 at 3:56 PM, Kees Cook <keescook@...omium.org> wrote:
>> On Thu, Aug 13, 2015 at 3:54 PM, Linus Torvalds
>> <torvalds@...ux-foundation.org> wrote:
>>> On Thu, Aug 13, 2015 at 3:49 PM, Linus Torvalds
>>> <torvalds@...ux-foundation.org> wrote:
>>>>
>>>> Does the attached patch make sense and work?
>>>
>>> Btw, I'm not all that happy with it anyway.
>>>
>>> I still think Denys' patch also potentially changed what audit and
>>> strace see for %rax in the pt_regs to -ENOSYS, which I'm not convinced
>>> is a good change.
>>>
>>> But maybe that three-liner patch fixes the immediate problem that
>>> David sees. David?
>>
>> Your patch fixes it for me. The seccomp compat selftests pass again
>> with audit enabled.
> 
> Kees, would it be straightforward to rig up the seccomp tests to
> automatically test compat?  The x86 selftests automatically test both
> native and compat, and that might be usable as a model.  I did that
> because it's extremely easy to regress one and not the other.

BTW, why 64-bt code doesn't need this RAX read-back?

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