linux-kernel - [RFC PATCH 0/5] ubifs: Support POSIX Access Control Lists (ACLs)

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Date: Wed, 20 Mar 2024 00:16:41 +0800
From: Li Zetao <lizetao1@...wei.com>
To: <richard@....at>, <chengzhihao1@...wei.com>
CC: <lizetao1@...wei.com>, <linux-kernel@...r.kernel.org>,
	<linux-mtd@...ts.infradead.org>
Subject: [RFC PATCH 0/5] ubifs: Support POSIX Access Control Lists (ACLs)

Hi,

This patchset is base on [1] and [2], adding implementation of ACLs for
ubifs.

Implement ACLs features based on POSIX to solve some difficulties that
require fine-grained access control. At the same time, it is also to
facilitate cross-file system migration.

In order to simplify the implementation, only v2 version POSIX ACLs are
implemented, eliminating the need for in-memory and on-flash format
conversion. And no need to implement security xattr handler in ubifs.

Some testcases have been tested and passed:
  * generic testcases (modified version) for acl group in xfstest[3], they are generic/026/053/077/099/105/237/307/318/319/375/389/444/449/529/697.
  * tacl_xattr.sh (modified version) in LTP[4].

[1]: https://lore.kernel.org/linux-mtd/1441962597-13543-1-git-send-email-shengyong1@huawei.com/
[2]: https://lore.kernel.org/linux-mtd/1476046382-19185-1-git-send-email-pascal.eberhard@gmail.com/
[3]: https://kernel.googlesource.com/pub/scm/fs/xfs/xfstests-dev/+/refs/heads/master/tests/generic/
[4]: https://github.com/linux-test-project/ltp/blob/master/testcases/kernel/fs/acl/tacl_xattr.sh

Li Zetao (5):
  ubifs: Implement POSIX Access Control Lists (ACLs)
  ubifs: Initialize or update ACLs for inode
  ubifs: Support accessing ACLs through inode_operations
  ubifs: Introduce ACLs mount options
  ubifs: Add ACLs config option

 fs/ubifs/Kconfig  |  14 +++++
 fs/ubifs/Makefile |   1 +
 fs/ubifs/acl.c    | 140 ++++++++++++++++++++++++++++++++++++++++++++++
 fs/ubifs/dir.c    |  18 ++++++
 fs/ubifs/file.c   |   6 ++
 fs/ubifs/super.c  |  40 +++++++++++++
 fs/ubifs/ubifs.h  |  15 +++++
 fs/ubifs/xattr.c  |   1 -
 8 files changed, 234 insertions(+), 1 deletion(-)
 create mode 100644 fs/ubifs/acl.c

-- 
2.34.1