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

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Message-ID: <CALCETrXGJQ33hDJ-GcVfrYx2qh0ewBwU5=o70UE=XuP+H2hz3g@mail.gmail.com>
Date:	Thu, 13 Aug 2015 15:59:54 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Kees Cook <keescook@...omium.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	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 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.

--Andy
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