linux-kernel - Re: [PATCH -next v2 0/6] landlock: add chmod and chown support

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Date:   Thu, 20 Apr 2023 19:40:44 +0200
From:   Mickaël Salaün <mic@...ikod.net>
To:     xiujianfeng <xiujianfeng@...wei.com>, paul@...l-moore.com,
        jmorris@...ei.org, serge@...lyn.com, shuah@...nel.org,
        corbet@....net
Cc:     linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-doc@...r.kernel.org, roberto.sassu@...wei.com,
        Konstantin Meskhidze <konstantin.meskhidze@...wei.com>
Subject: Re: [PATCH -next v2 0/6] landlock: add chmod and chown support


On 18/04/2023 12:53, xiujianfeng wrote:
> Hi Mickael,
> 
> Sorry about the long silence on this work, As we known this work depends
> on another work about changing argument from struct dentry to struct
> path for some attr/xattr related lsm hooks, I'm stuck with this thing,
> because IMA/EVM is a special security module which is not LSM-based
> currently, and severely coupled with the file system. so I am waiting
> for Roberto Sassu' work (Move IMA and EVM to the LSM infrastructure) to
> be ready, I think it can make my work more easy. you can find
> Roberto'work here,
> https://lwn.net/ml/linux-kernel/20230303181842.1087717-1-roberto.sassu@huaweicloud.com/
> 
> Any good idea are welcome, thanks.

Thanks for the update Xiu.

Which part would be needed from Roberto's patch series?


> 
> 
> On 2022/8/27 19:12, Xiu Jianfeng wrote:
>> v2:
>>   * abstract walk_to_visible_parent() helper
>>   * chmod and chown rights only take affect on directory's context
>>   * add testcase for fchmodat/lchown/fchownat
>>   * fix other review issues
>>
>> Xiu Jianfeng (6):
>>    landlock: expand access_mask_t to u32 type
>>    landlock: abstract walk_to_visible_parent() helper
>>    landlock: add chmod and chown support
>>    landlock/selftests: add selftests for chmod and chown
>>    landlock/samples: add chmod and chown support
>>    landlock: update chmod and chown support in document
>>
>>   Documentation/userspace-api/landlock.rst     |   9 +-
>>   include/uapi/linux/landlock.h                |  10 +-
>>   samples/landlock/sandboxer.c                 |  13 +-
>>   security/landlock/fs.c                       | 110 ++++++--
>>   security/landlock/limits.h                   |   2 +-
>>   security/landlock/ruleset.h                  |   2 +-
>>   security/landlock/syscalls.c                 |   2 +-
>>   tools/testing/selftests/landlock/base_test.c |   2 +-
>>   tools/testing/selftests/landlock/fs_test.c   | 267 ++++++++++++++++++-
>>   9 files changed, 386 insertions(+), 31 deletions(-)
>>