linux-kernel - [PATCH 0/4] Atomic addfd send and reply

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Date:   Sat,  1 May 2021 17:18:47 -0700
From:   Sargun Dhillon <sargun@...gun.me>
To:     Kees Cook <keescook@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Containers <containers@...ts.linux.dev>,
        Tycho Andersen <tycho@...ho.pizza>,
        Andy Lutomirski <luto@...nel.org>
Cc:     Sargun Dhillon <sargun@...gun.me>,
        Mauricio Vásquez Bernal <mauricio@...volk.io>,
        Rodrigo Campos <rodrigo@...volk.io>,
        Giuseppe Scrivano <gscrivan@...hat.com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Mickaël Salaün <mic@...ux.microsoft.com>
Subject: [PATCH 0/4] Atomic addfd send and reply

This is somewhat of a respin of "Handle seccomp notification preemption"
but without the controversial parts.

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 (socket).

Rodrigo Campos (2):
  seccomp: Support atomic "addfd + send reply"
  selftests/seccomp: Add test for atomic addfd+send

Sargun Dhillon (2):
  Documentation: seccomp: Fix user notification documentation
  seccomp: Refactor notification handler to prepare for new semantics

 .../userspace-api/seccomp_filter.rst          | 28 +++++--
 include/uapi/linux/seccomp.h                  |  1 +
 kernel/seccomp.c                              | 79 ++++++++++++++-----
 tools/testing/selftests/seccomp/seccomp_bpf.c | 38 +++++++++
 4 files changed, 120 insertions(+), 26 deletions(-)

-- 
2.25.1