diff options
Diffstat (limited to 'security/landlock/fs.c')
| -rw-r--r-- | security/landlock/fs.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/security/landlock/fs.c b/security/landlock/fs.c index 0804f76a67be..7d79fc8abe21 100644 --- a/security/landlock/fs.c +++ b/security/landlock/fs.c @@ -1639,6 +1639,29 @@ static int hook_file_ioctl_compat(struct file *file, unsigned int cmd, return -EACCES; } +static void hook_file_set_fowner(struct file *file) +{ + struct landlock_ruleset *new_dom, *prev_dom; + + /* + * Lock already held by __f_setown(), see commit 26f204380a3c ("fs: Fix + * file_set_fowner LSM hook inconsistencies"). + */ + lockdep_assert_held(&file_f_owner(file)->lock); + new_dom = landlock_get_current_domain(); + landlock_get_ruleset(new_dom); + prev_dom = landlock_file(file)->fown_domain; + landlock_file(file)->fown_domain = new_dom; + + /* Called in an RCU read-side critical section. */ + landlock_put_ruleset_deferred(prev_dom); +} + +static void hook_file_free_security(struct file *file) +{ + landlock_put_ruleset_deferred(landlock_file(file)->fown_domain); +} + static struct security_hook_list landlock_hooks[] __ro_after_init = { LSM_HOOK_INIT(inode_free_security_rcu, hook_inode_free_security_rcu), @@ -1663,6 +1686,8 @@ static struct security_hook_list landlock_hooks[] __ro_after_init = { LSM_HOOK_INIT(file_truncate, hook_file_truncate), LSM_HOOK_INIT(file_ioctl, hook_file_ioctl), LSM_HOOK_INIT(file_ioctl_compat, hook_file_ioctl_compat), + LSM_HOOK_INIT(file_set_fowner, hook_file_set_fowner), + LSM_HOOK_INIT(file_free_security, hook_file_free_security), }; __init void landlock_add_fs_hooks(void) |