linux-kernel - [PATCH 0/4 v3] seccomp: improve handling of SECCOMP_IOCTL_NOTIF

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Date: Fri, 28 Jun 2024 02:10:10 +0000
From: Andrei Vagin <avagin@...gle.com>
To: Kees Cook <keescook@...omium.org>
Cc: linux-kernel@...r.kernel.org, Tycho Andersen <tandersen@...flix.com>, 
	Andy Lutomirski <luto@...capital.net>, Will Drewry <wad@...omium.org>, Oleg Nesterov <oleg@...hat.com>, 
	Christian Brauner <brauner@...nel.org>, Andrei Vagin <avagin@...gle.com>
Subject: [PATCH 0/4 v3] seccomp: improve handling of SECCOMP_IOCTL_NOTIF_RECV

This patch set addresses two problems with the SECCOMP_IOCTL_NOTIF_RECV
ioctl:
* it doesn't return when the seccomp filter becomes unused (all tasks
  have exited).
* EPOLLHUP is triggered not when a task exits, but rather when its zombie
  is collected.

v2: - Remove unnecessary checks of PF_EXITING.
    - Take siglock with disabling irqs.
    Thanks to Oleg for the review and the help with the first version.
v3: - a few fixes suggested by Kees.
    - add a test to ensure that a dead thread leader doesn't prevent
      installing new filters with SECCOMP_FILTER_FLAG_TSYNC.

Andrei Vagin (3):
  seccomp: interrupt SECCOMP_IOCTL_NOTIF_RECV when all users have exited
  seccomp: release task filters when the task exits
  selftests/seccomp: add test for NOTIF_RECV and unused filters
  selftests/seccomp: check that a zombie leader doesn't affect others

 kernel/exit.c                                 |   3 +-
 kernel/seccomp.c                              |  30 +++-
 tools/testing/selftests/seccomp/seccomp_bpf.c | 131 ++++++++++++++++++
 3 files changed, 157 insertions(+), 7 deletions(-)

-- 
2.45.0.rc1.225.g2a3ae87e7f-goog