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Date:   Thu, 28 Jul 2022 12:12:41 +0200
From:   Mickaël Salaün <mic@...ikod.net>
To:     "Konstantin Meskhidze (A)" <konstantin.meskhidze@...wei.com>
Cc:     willemdebruijn.kernel@...il.com,
        linux-security-module@...r.kernel.org, netdev@...r.kernel.org,
        netfilter-devel@...r.kernel.org, yusongping@...wei.com,
        anton.sirazetdinov@...wei.com
Subject: Re: [PATCH v6 00/17] Network support for Landlock



On 28/07/2022 11:25, Konstantin Meskhidze (A) wrote:
> 
> 
> 7/27/2022 10:54 PM, Mickaël Salaün пишет:
>>
>>
>> On 26/07/2022 19:43, Mickaël Salaün wrote:
>>>
>>> On 21/06/2022 10:22, Konstantin Meskhidze wrote:
>>>> Hi,
>>>> This is a new V6 patch related to Landlock LSM network confinement.
>>>> It is based on the latest landlock-wip branch on top of v5.19-rc2:
>>>> https://git.kernel.org/pub/scm/linux/kernel/git/mic/linux.git/log/?h=landlock-wip
>>>>
>>>> It brings refactoring of previous patch version V5:
>>>>      - Fixes some logic errors and typos.
>>>>      - Adds additional FIXTURE_VARIANT and FIXTURE_VARIANT_ADD helpers
>>>>      to support both ip4 and ip6 families and shorten seltests' code.
>>>>      - Makes TCP sockets confinement support optional in sandboxer 
>>>> demo.
>>>>      - Formats the code with clang-format-14
>>>>
>>>> All test were run in QEMU evironment and compiled with
>>>>   -static flag.
>>>>   1. network_test: 18/18 tests passed.
>>>>   2. base_test: 7/7 tests passed.
>>>>   3. fs_test: 59/59 tests passed.
>>>>   4. ptrace_test: 8/8 tests passed.
>>>>
>>>> Still have issue with base_test were compiled without -static flag
>>>> (landlock-wip branch without network support)
>>>> 1. base_test: 6/7 tests passed.
>>>>   Error:
>>>>   #  RUN           global.inconsistent_attr ...
>>>>   # base_test.c:54:inconsistent_attr:Expected ENOMSG (42) == errno (22)
>>>>   # inconsistent_attr: Test terminated by assertion
>>>>   #          FAIL  global.inconsistent_attr
>>>> not ok 1 global.inconsistent_attr
>>>>
>>>> LCOV - code coverage report:
>>>>              Hit  Total  Coverage
>>>> Lines:      952  1010    94.3 %
>>>> Functions:  79   82      96.3 %
>>>>
>>>> Previous versions:
>>>> v5: 
>>>> https://lore.kernel.org/linux-security-module/20220516152038.39594-1-konstantin.meskhidze@huawei.com
>>>> v4: 
>>>> https://lore.kernel.org/linux-security-module/20220309134459.6448-1-konstantin.meskhidze@huawei.com/
>>>> v3: 
>>>> https://lore.kernel.org/linux-security-module/20220124080215.265538-1-konstantin.meskhidze@huawei.com/
>>>> v2: 
>>>> https://lore.kernel.org/linux-security-module/20211228115212.703084-1-konstantin.meskhidze@huawei.com/
>>>> v1: 
>>>> https://lore.kernel.org/linux-security-module/20211210072123.386713-1-konstantin.meskhidze@huawei.com/
>>>>
>>>> Konstantin Meskhidze (17):
>>>>    landlock: renames access mask
>>>>    landlock: refactors landlock_find/insert_rule
>>>>    landlock: refactors merge and inherit functions
>>>>    landlock: moves helper functions
>>>>    landlock: refactors helper functions
>>>>    landlock: refactors landlock_add_rule syscall
>>>>    landlock: user space API network support
>>>>    landlock: adds support network rules
>>>>    landlock: implements TCP network hooks
>>>>    seltests/landlock: moves helper function
>>>>    seltests/landlock: adds tests for bind() hooks
>>>>    seltests/landlock: adds tests for connect() hooks
>>>>    seltests/landlock: adds AF_UNSPEC family test
>>>>    seltests/landlock: adds rules overlapping test
>>>>    seltests/landlock: adds ruleset expanding test
>>>>    seltests/landlock: adds invalid input data test
>>>>    samples/landlock: adds network demo
>>>>
>>>>   include/uapi/linux/landlock.h               |  49 ++
>>>>   samples/landlock/sandboxer.c                | 118 ++-
>>>>   security/landlock/Kconfig                   |   1 +
>>>>   security/landlock/Makefile                  |   2 +
>>>>   security/landlock/fs.c                      | 162 +---
>>>>   security/landlock/limits.h                  |   8 +-
>>>>   security/landlock/net.c                     | 155 ++++
>>>>   security/landlock/net.h                     |  26 +
>>>>   security/landlock/ruleset.c                 | 448 +++++++++--
>>>>   security/landlock/ruleset.h                 |  91 ++-
>>>>   security/landlock/setup.c                   |   2 +
>>>>   security/landlock/syscalls.c                | 168 +++--
>>>>   tools/testing/selftests/landlock/common.h   |  10 +
>>>>   tools/testing/selftests/landlock/config     |   4 +
>>>>   tools/testing/selftests/landlock/fs_test.c  |  10 -
>>>>   tools/testing/selftests/landlock/net_test.c | 774 
>>>> ++++++++++++++++++++
>>>>   16 files changed, 1737 insertions(+), 291 deletions(-)
>>>>   create mode 100644 security/landlock/net.c
>>>>   create mode 100644 security/landlock/net.h
>>>>   create mode 100644 tools/testing/selftests/landlock/net_test.c
>>>>
>>>> -- 
>>>> 2.25.1
>>>>
>>>
>>> I did a thorough review of all the code. I found that the main issue 
>>> with this version is that we stick to the layers limit whereas it is 
>>> only relevant for filesystem hierarchies. You'll find in the 
>>> following patch miscellaneous fixes and improvement, with some TODOs 
>>> to get rid of this layer limit. We'll need a test to check that too. 
>>> You'll need to integrate this diff into your patches though.
>>
>> You can find the related patch here:
>> https://git.kernel.org/mic/c/8f4104b3dc59e7f110c9b83cdf034d010a2d006f
> 
>   Is this patch based on your updated landlock-wip branch or it's still 
> on Linux 5.19-rc2 version?

It's based on v5.19-rc2 but it doesn't really matter. I removed the 
landlock-wip branch, which is not needed anymore. You can base your 
patches on Linus' master branch.

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