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landlock: Add design choices documentation for filesystem access rights

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Summarize the rationale of filesystem access rights according to the
file type.

Update the document date.

Reviewed-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Mickaël Salaün <mic@digikod.net>
Link: https://lore.kernel.org/r/20220506161102.525323-13-mic@digikod.net
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Mickaël Salaün 2022-05-06 18:11:02 +02:00
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Documentation/security/landlock.rst
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@ -7,7 +7,7 @@ Landlock LSM: kernel documentation
==================================
:Author: Mickaël Salaün
:Date: March 2021
:Date: May 2022
Landlock's goal is to create scoped access-control (i.e. sandboxing). To
harden a whole system, this feature should be available to any process,
@ -42,6 +42,21 @@ Guiding principles for safe access controls
* Computation related to Landlock operations (e.g. enforcing a ruleset) shall
only impact the processes requesting them.
Design choices
==============
Filesystem access rights
------------------------
All access rights are tied to an inode and what can be accessed through it.
Reading the content of a directory doesn't imply to be allowed to read the
content of a listed inode. Indeed, a file name is local to its parent
directory, and an inode can be referenced by multiple file names thanks to
(hard) links. Being able to unlink a file only has a direct impact on the
directory, not the unlinked inode. This is the reason why
`LANDLOCK_ACCESS_FS_REMOVE_FILE` or `LANDLOCK_ACCESS_FS_REFER` are not allowed
to be tied to files but only to directories.
Tests
=====