netdev - Re: [PATCH v11 10/12] selftests/landlock: Add 11 new test suites dedicated to network

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Date: Sun, 2 Jul 2023 10:45:51 +0200
From: Mickaël Salaün <mic@...ikod.net>
To: Günther Noack <gnoack3000@...il.com>,
 Konstantin Meskhidze <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, artem.kuzin@...wei.com
Subject: Re: [PATCH v11 10/12] selftests/landlock: Add 11 new test suites
 dedicated to network


On 01/07/2023 21:07, Günther Noack wrote:
> Hi!
> 
> On Tue, May 16, 2023 at 12:13:37AM +0800, Konstantin Meskhidze wrote:
>> +TEST_F(inet, bind)
> 
> If you are using TEST_F() and you are enforcing a Landlock ruleset
> within that test, doesn't that mean that the same Landlock ruleset is
> now also enabled on other tests that get run after that test?
> 
> Most of the other Landlock selftests use TEST_F_FORK() for that
> reason, so that the Landlock enforcement stays local to the specific
> test, and does not accidentally influence the observed behaviour in
> other tests.

Initially Konstantin wrote tests with TEST_F_FORK() but I asked him to 
only use TEST_F() because TEST_F_FORK() is only useful when a 
FIXTURE_TEARDOWN() needs access rights that were dropped with a 
TEST_F(), e.g. to unmount mount points set up with a FIXTURE_SETUP() 
while Landlock restricted a test process.

Indeed, TEST_F() already fork() to make sure there is no side effect 
with tests.

> 
> The same question applies to other test functions in this file as
> well.
> 
> –Günther