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

From: Kees Cook
Date: Thu Aug 13 2015 - 18:56:52 EST

On Thu, Aug 13, 2015 at 3:54 PM, Linus Torvalds
<torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
> On Thu, Aug 13, 2015 at 3:49 PM, Linus Torvalds
> <torvalds@xxxxxxxxxxxxxxxxxxxx> 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 Cook
Chrome OS Security
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