[RFC PATCH seccomp 1/2] seccomp/cache: Add "emulator" to check if filter is arg-dependent

[YiFei Zhu]

On Mon, Sep 21, 2020 at 7:26 PM Jann Horn <jannh at google.com> wrote:
> > In the initial RFC patch I only added to x86. I could add it to any
> > arch that has seccomp filters. Though, I'm wondering, why is SECCOMP
> > in the arch-specific Kconfigs?
>
> Ugh, yeah, the existing code is already bad... as far as I can tell,
> SECCOMP shouldn't be there, and instead the arch-specific Kconfig
> should define something like HAVE_ARCH_SECCOMP and then arch/Kconfig
> would define SECCOMP and let it depend on HAVE_ARCH_SECCOMP. It's
> really gross how the SECCOMP config description has been copypasted
> into a dozen different Kconfig files; and looking around a bit, you
> can actually see that e.g. s390 has an utterly outdated help text
> which still claims that seccomp is controlled via the ancient
> "/proc/<pid>/seccomp". I guess this very nicely illustrates why
> putting such options into arch-specific Kconfig is a bad idea. :P

Ah, time to fix this then.

YiFei Zhu