Re: [PATCH v2] x86/asm/entry/32, selftests: Add test_syscall_vdso test

Ingo Molnar
2015-06-15T20:25:22Z

* Denys Vlasenko <dvlasenk@redhat.com> wrote:

> On 06/13/2015 08:39 AM, Ingo Molnar wrote:
> >
> > * Denys Vlasenko <dvlasenk@redhat.com> wrote:
> >
> >> The test is fairly simplistic: it checks that all registers
> >> are preserved across 32-bit syscall via VDSO.
> >>
> >> Run-tested:
> >>
> >> $ ./test_syscall_vdso_32
> >> [RUN] Executing 6-argument 32-bit syscall via VDSO
> >> [Ok] Arguments are preserved across syscall
> >> [RUN] Executing 6-argument 32-bit syscall via INT 80
> >> [Ok] Arguments are preserved across syscall
> >> [RUN] Running tests under ptrace
> >> [RUN] Executing 6-argument 32-bit syscall via VDSO
> >> [Ok] Arguments are preserved across syscall
> >> [RUN] Executing 6-argument 32-bit syscall via INT 80
> >> [Ok] Arguments are preserved across syscall
> >
> > Just curious: is there a kernel sha1 where this test would fail? Or did you try to
> > provoke an information leak perhaps?
>
> I did see failures, more than once, when testing my own patches.

Ok!

> I'm not aware of released kernels which are buggy wrt this test.

Great! :-)

Thanks,

Ingo