Re: [Regression v4.2 ?] 32-bit seccomp-BPF returned errno values wrong in VM?
From: Kees Cook
Date: Thu Aug 13 2015 - 19:15:01 EST
On Thu, Aug 13, 2015 at 3:59 PM, Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote:
> On Thu, Aug 13, 2015 at 3:56 PM, Kees Cook <keescook@xxxxxxxxxxxx> wrote:
>> 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, 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.
Yeah, I'll figure out how to get this working sanely. There are some
ugly behaviors on arm64 doing compat that seccomp found too, so I'll
need those targets for more than just x86.
Chrome OS Security
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/