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

On Mon, Aug 26, 2019 at 7:57 AM Tycho Andersen [off-list ref] wrote:

Hi,

On Fri, Aug 23, 2019 at 05:30:53PM -0700, Paul Walmsley wrote:

quoted

On Thu, 22 Aug 2019, David Abdurachmanov wrote:

quoted

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
[off-list ref].

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