On 16/01/2023 09:58, Konstantin Meskhidze wrote:
Add new key_type argument to the landlock_init_layer_masks() helper.
Add a masks_array_size argument to the landlock_unmask_layers() helper.
These modifications support implementing new rule types in the next
Landlock versions.
Signed-off-by: Mickaël Salaün <mic@xxxxxxxxxxx>
Signed-off-by: Konstantin Meskhidze <konstantin.meskhidze@xxxxxxxxxx>
---
Changes since v8:
* None.
Changes since v7:
* Refactors commit message, adds a co-developer.
* Minor fixes.
Changes since v6:
* Removes masks_size attribute from init_layer_masks().
* Refactors init_layer_masks() with new landlock_key_type.
Changes since v5:
* Splits commit.
* Formats code with clang-format-14.
Changes since v4:
* Refactors init_layer_masks(), get_handled_accesses()
and unmask_layers() functions to support multiple rule types.
* Refactors landlock_get_fs_access_mask() function with
LANDLOCK_MASK_ACCESS_FS mask.
Changes since v3:
* Splits commit.
* Refactors landlock_unmask_layers functions.
---
security/landlock/fs.c | 43 ++++++++++++++++--------------
security/landlock/ruleset.c | 52 ++++++++++++++++++++++++++-----------
security/landlock/ruleset.h | 17 ++++++------
3 files changed, 70 insertions(+), 42 deletions(-)
diff --git a/security/landlock/fs.c b/security/landlock/fs.c
index 73a7399f93ba..a73dbd3f9ddb 100644
--- a/security/landlock/fs.c
+++ b/security/landlock/fs.c
[...]
@@ -658,10 +677,13 @@ access_mask_t landlock_init_layer_masks(
const unsigned long access_req = access_request;
unsigned long access_bit;
- for_each_set_bit(access_bit, &access_req,
- ARRAY_SIZE(*layer_masks)) {
+ for_each_set_bit(access_bit, &access_req, num_access) {
+ /*
+ * Artificially handles all initially denied by default
+ * access rights.
+ */
No need to re-add this old comment which was removed with patch 2/12.
if (BIT_ULL(access_bit) &
- landlock_get_fs_access_mask(domain, layer_level)) {
+ get_access_mask(domain, layer_level)) {
(*layer_masks)[access_bit] |=
BIT_ULL(layer_level);
handled_accesses |= BIT_ULL(access_bit);
diff --git a/security/landlock/ruleset.h b/security/landlock/ruleset.h
index 60a3c4d4d961..77349764e111 100644
--- a/security/landlock/ruleset.h
+++ b/security/landlock/ruleset.h
@@ -266,14 +266,15 @@ landlock_get_fs_access_mask(const struct landlock_ruleset *const ruleset,
return landlock_get_raw_fs_access_mask(ruleset, layer_level) |
ACCESS_FS_INITIALLY_DENIED;
}
-bool landlock_unmask_layers(
- const struct landlock_rule *const rule,
- const access_mask_t access_request,
- layer_mask_t (*const layer_masks)[LANDLOCK_NUM_ACCESS_FS]);
+bool landlock_unmask_layers(const struct landlock_rule *const rule,
+ const access_mask_t access_request,
+ layer_mask_t (*const layer_masks)[],
+ const size_t masks_array_size);
-access_mask_t landlock_init_layer_masks(
- const struct landlock_ruleset *const domain,
- const access_mask_t access_request,
- layer_mask_t (*const layer_masks)[LANDLOCK_NUM_ACCESS_FS]);
+access_mask_t
+landlock_init_layer_masks(const struct landlock_ruleset *const domain,
+ const access_mask_t access_request,
+ layer_mask_t (*const layer_masks)[],
+ const enum landlock_key_type key_type);
#endif /* _SECURITY_LANDLOCK_RULESET_H */
