[PATCH v9 02/12] landlock: Allow filesystem layout changes for domains without such rule type

[Konstantin Meskhidze (A)]

2/10/2023 8:34 PM, Mickaël Salaün пишет:
> Hi Konstantin,
> 
> I think this patch series is almost ready. Here is a first batch of
> review, I'll send more next week.
> 
   Hi Mickaёl.
   thnaks for the review.

> 
> I forgot to update the documentation. Can you please squash the
> following patch into this one?

   No problem. I will squash.
   Can I download this doc patch from your repo or I can use the diff below?
> 
> 
> diff --git a/Documentation/userspace-api/landlock.rst
> b/Documentation/userspace-api/landlock.rst
> index 980558b879d6..fc2be89b423f 100644
> --- a/Documentation/userspace-api/landlock.rst
> +++ b/Documentation/userspace-api/landlock.rst
> @@ -416,9 +416,9 @@ Current limitations
>    Filesystem topology modification
>    --------------------------------
> 
> -As for file renaming and linking, a sandboxed thread cannot modify its
> -filesystem topology, whether via :manpage:`mount(2)` or
> -:manpage:`pivot_root(2)`.  However, :manpage:`chroot(2)` calls are not
> denied.
> +Threads sandboxed with filesystem restrictions cannot modify filesystem
> +topology, whether via :manpage:`mount(2)` or :manpage:`pivot_root(2)`.
> +However, :manpage:`chroot(2)` calls are not denied.
> 
>    Special filesystems
>    -------------------
> 
> 
> On 16/01/2023 09:58, Konstantin Meskhidze wrote:
>> From: Mickaël Salaün <mic at digikod.net>
>> 
>> 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.
>> 
>> Remove unnecessary inlining.
>> 
>> Signed-off-by: Mickaël Salaün <mic at digikod.net>
>> ---
>> 
>> Changes since v8:
>> * Refactors get_handled_fs_accesses().
>> * Adds landlock_get_raw_fs_access_mask() helper.
>> 
> .