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Diffstat (limited to 'Documentation/security/landlock.rst')
| -rw-r--r-- | Documentation/security/landlock.rst | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/Documentation/security/landlock.rst b/Documentation/security/landlock.rst index 3df68cb1d10f..c0029d5d02eb 100644 --- a/Documentation/security/landlock.rst +++ b/Documentation/security/landlock.rst @@ -7,7 +7,7 @@ Landlock LSM: kernel documentation ================================== :Author: Mickaël Salaün -:Date: March 2021 +:Date: September 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 does not 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 ===== |