linux-kernel - [PATCH v3 0/3] Allow to change ipc/mq sysctls inside ipc namespace

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <cover.1663756794.git.legion@kernel.org>
Date:   Wed, 21 Sep 2022 12:41:46 +0200
From:   Alexey Gladkov <legion@...nel.org>
To:     LKML <linux-kernel@...r.kernel.org>,
        Linux Containers <containers@...ts.linux.dev>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Christian Brauner <brauner@...nel.org>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        Kees Cook <keescook@...omium.org>,
        Manfred Spraul <manfred@...orfullife.com>
Subject: [PATCH v3 0/3] Allow to change ipc/mq sysctls inside ipc namespace

Right now ipc and mq limits count as per ipc namespace, but only real
root can change them. By default, the current values of these limits are
such that it can only be reduced. Since only root can change the values,
it is impossible to reduce these limits in the rootless container.

We can allow limit changes within ipc namespace because mq parameters
are limited by RLIMIT_MSGQUEUE and ipc parameters are not limited to
anything other than cgroups.

--

Alexey Gladkov (3):
  sysctl: Allow change system v ipc sysctls inside ipc namespace
  sysctl: Allow to change limits for posix messages queues
  docs: Add information about ipc sysctls limitations

 Documentation/admin-guide/sysctl/kernel.rst | 14 ++++++--
 ipc/ipc_sysctl.c                            | 36 +++++++++++++++++++--
 ipc/mq_sysctl.c                             | 36 +++++++++++++++++++++
 3 files changed, 81 insertions(+), 5 deletions(-)

-- 
2.33.4