linux-kernel - [PATCH v1 0/2] Add LSM access controls for io_uring

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Date:   Mon,  7 Nov 2022 15:57:51 -0500
From:   Gil Cukierman <cukie@...gle.com>
To:     Jens Axboe <axboe@...nel.dk>,
        Pavel Begunkov <asml.silence@...il.com>,
        Paul Moore <paul@...l-moore.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Stephen Smalley <stephen.smalley.work@...il.com>,
        Eric Paris <eparis@...isplace.org>
Cc:     Gil Cukierman <cukie@...gle.com>, kernel-team@...roid.com,
        linux-kernel@...r.kernel.org, io-uring@...r.kernel.org,
        linux-security-module@...r.kernel.org, selinux@...r.kernel.org
Subject: [PATCH v1 0/2] Add LSM access controls for io_uring_setup

This patchset provides the changes required for controlling access to
the io_uring_setup system call by LSMs. It does this by adding a new
hook to io_uring. It also provides the SELinux implementation for a new
permission, io_uring { setup }, using the new hook.

This is important because existing io_uring hooks only support limiting
the sharing of credentials and access to the sensitive uring_cmd file
op. Users of LSMs may also want the ability to tightly control which
callers can retrieve an io_uring capable fd from the kernel, which is
needed for all subsequent io_uring operations.

This was tested by running the liburing test suite on a kernel
containing these patches.

Gil Cukierman (2):
  lsm,io_uring: add LSM hook for io_uring_setup
  selinux: add support for the io_uring setup permission

 include/linux/lsm_hook_defs.h       |  1 +
 include/linux/lsm_hooks.h           |  3 +++
 include/linux/security.h            |  5 +++++
 io_uring/io_uring.c                 |  5 +++++
 security/security.c                 |  4 ++++
 security/selinux/hooks.c            | 13 +++++++++++++
 security/selinux/include/classmap.h |  2 +-
 7 files changed, 32 insertions(+), 1 deletion(-)

-- 
2.38.0.135.g90850a2211-goog