netdev - Re: [PATCH] landlock: Allow filesystem layout changes for domains without such rule type

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Message-ID: <787e7546-25b9-4e32-6560-b6907cdd6401@digikod.net>
Date:   Mon, 28 Nov 2022 21:25:31 +0100
From:   Mickaël Salaün <mic@...ikod.net>
To:     "Konstantin Meskhidze (A)" <konstantin.meskhidze@...wei.com>
Cc:     artem.kuzin@...wei.com, gnoack3000@...il.com,
        willemdebruijn.kernel@...il.com,
        linux-security-module@...r.kernel.org, netdev@...r.kernel.org,
        netfilter-devel@...r.kernel.org
Subject: Re: [PATCH] landlock: Allow filesystem layout changes for domains
 without such rule type


On 28/11/2022 04:02, Konstantin Meskhidze (A) wrote:
> 
> 
> 11/17/2022 9:55 PM, Mickaël Salaün пишет:
>> Allow mount point and root directory changes when there is no filesystem
>> rule tied to the current Landlock domain.  This doesn't change anything
>> for now because a domain must have at least a (filesystem) rule, but
>> this will change when other rule types will come.  For instance, a
>> domain only restricting the network should have no impact on filesystem
>> restrictions.
>>
>> Add a new get_current_fs_domain() helper to quickly check filesystem
>> rule existence for all filesystem LSM hooks.
> 
>     Ok. I got it.
>     Do I need also to add a new network helper:
>     like landlock_get_raw_net_access_mask?

A get_raw helper would not be useful if there is not network access 
initially denied (like for FS_REFER).