Re: [PATCH v2] riscv: add support for SECCOMP and SECCOMP_FILTER

[David Abdurachmanov]

On Mon, Aug 26, 2019 at 7:57 AM Tycho Andersen <tycho@xxxxxxxx> wrote:
>
> Hi,
>
> On Fri, Aug 23, 2019 at 05:30:53PM -0700, Paul Walmsley wrote:
> > On Thu, 22 Aug 2019, David Abdurachmanov wrote:
> >
> > > There is one failing kernel selftest: global.user_notification_signal
> >
> > Also - could you follow up with the author of this failing test to see if
> > we can get some more clarity about what might be going wrong here?  It
> > appears that the failing test was added in commit 6a21cc50f0c7f ("seccomp:
> > add a return code to trap to userspace") by Tycho Andersen
> > <tycho@xxxxxxxx>.
>
> Can you post an strace and a cat of /proc/$pid/stack for both tasks
> where it gets stuck? I don't have any riscv hardware, and it "works
> for me" on x86 and arm64 with 100 tries.

I don't have the a build with SECCOMP for the board right now, so it
will have to wait. I just finished a new kernel (almost rc6) for Fedora,
but it will take time to assemble new repositories and a disk image.

There is older disk image available (5.2.0-rc7 kernel with v2 SECCOMP)
for QEMU or libvirt/QEMU:

https://dl.fedoraproject.org/pub/alt/risc-v/disk-images/fedora/rawhide/20190703.n.0/Developer/
https://fedoraproject.org/wiki/Architectures/RISC-V/Installing#Boot_with_libvirt

(If you are interesting trying it locally.)

IIRC I attempted to connected with strace, but it quickly returns and fails
properly. Simply put strace unblocks whatever is stuck.

david