linux-kernel - [RFC PATCH 0/3] Seccomp non-preemptible notifier

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Date:   Sat, 20 Feb 2021 01:04:59 -0800
From:   Sargun Dhillon <sargun@...gun.me>
To:     Kees Cook <keescook@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Containers <containers@...ts.linux-foundation.org>
Cc:     Sargun Dhillon <sargun@...gun.me>,
        Mauricio Vásquez Bernal <mauricio@...volk.io>,
        Rodrigo Campos <rodrigo@...volk.io>,
        Tycho Andersen <tycho@...ho.pizza>,
        Giuseppe Scrivano <gscrivan@...hat.com>
Subject: [RFC PATCH 0/3] Seccomp non-preemptible notifier

This patchset addresses a race condition we've dealt with recently with
seccomp. Specifically programs interrupting syscalls while they're in
progress. This was exacerbated by Golang's recent adoption of "async
preemption", in which they try to interrupt any syscall that's been
running for more than 10ms during GC. During certain syscalls, it's
non-trivial to write them in a reetrant manner in userspace (mount).

This has a couple semantic changes, and relaxes a check on seccomp_data.
I can deal with these, but this was a first cut. I also expect that the
patch would be squashed down, but it's split out for easier review.

Sargun Dhillon (3):
  seccomp: Refactor notification handler to prepare for new semantics
  seccomp: Add wait_killable semantic to seccomp user notifier
  selftests/seccomp: Add test for wait killable notifier

 include/uapi/linux/seccomp.h                  | 10 +++
 kernel/seccomp.c                              | 63 +++++++++++++------
 tools/testing/selftests/seccomp/seccomp_bpf.c | 60 ++++++++++++++++++
 3 files changed, 114 insertions(+), 19 deletions(-)

-- 
2.25.1