[PATCH -next v2 6/6] landlock: update chmod and chown support in document

[Xiu Jianfeng <xiujianfeng@xxxxxxxxxx>]

update LANDLOCK_ACCESS_FS_{CHMOD, CHGRP} support and add abi change
in the document.

Signed-off-by: Xiu Jianfeng <xiujianfeng@xxxxxxxxxx>
---
 Documentation/userspace-api/landlock.rst | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/Documentation/userspace-api/landlock.rst b/Documentation/userspace-api/landlock.rst
index 2509c2fbf98f..0e97a7998fa1 100644
--- a/Documentation/userspace-api/landlock.rst
+++ b/Documentation/userspace-api/landlock.rst
@@ -61,7 +61,9 @@ the need to be explicit about the denied-by-default access rights.
             LANDLOCK_ACCESS_FS_MAKE_BLOCK |
             LANDLOCK_ACCESS_FS_MAKE_SYM |
             LANDLOCK_ACCESS_FS_REFER |
-            LANDLOCK_ACCESS_FS_TRUNCATE,
+            LANDLOCK_ACCESS_FS_TRUNCATE |
+            LANDLOCK_ACCESS_FS_CHMOD |
+            LANDLOCK_ACCESS_FS_CHGRP
     };
 
 Because we may not know on which kernel version an application will be
@@ -90,6 +92,11 @@ the ABI.
     case 2:
             /* Removes LANDLOCK_ACCESS_FS_TRUNCATE for ABI < 3 */
             ruleset_attr.handled_access_fs &= ~LANDLOCK_ACCESS_FS_TRUNCATE;
+            __attribute__((fallthrough));
+    case 3:
+            /* Removes LANDLOCK_ACCESS_FS_{CHMOD, CHGRP} for ABI < 4 */
+            ruleset_attr.handled_access_fs &= ~(LANDLOCK_ACCESS_FS_CHMOD |
+                                                LANDLOCK_ACCESS_FS_CHGRP);
     }
 
 This enables to create an inclusive ruleset that will contain our rules.
-- 
2.17.1