LSM: Introduce enum lsm_order
In preparation for distinguishing the "capability" LSM from other LSMs, it
must be ordered first. This introduces LSM_ORDER_MUTABLE for the general
LSMs and LSM_ORDER_FIRST for capability. In the future LSM_ORDER_LAST
for could be added for anything that must run last (e.g. Landlock may
use this).
Signed-off-by: Kees Cook <keescook@chromium.org>
diff --git a/security/security.c b/security/security.c
index 35f93b7..8b673bb 100644
--- a/security/security.c
+++ b/security/security.c
@@ -174,6 +174,12 @@ static void __init ordered_lsm_parse(const char *order, const char *origin)
struct lsm_info *lsm;
char *sep, *name, *next;
+ /* LSM_ORDER_FIRST is always first. */
+ for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
+ if (lsm->order == LSM_ORDER_FIRST)
+ append_ordered_lsm(lsm, "first");
+ }
+
/* Process "security=", if given. */
if (chosen_major_lsm) {
struct lsm_info *major;
@@ -202,7 +208,8 @@ static void __init ordered_lsm_parse(const char *order, const char *origin)
bool found = false;
for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
- if (strcmp(lsm->name, name) == 0) {
+ if (lsm->order == LSM_ORDER_MUTABLE &&
+ strcmp(lsm->name, name) == 0) {
append_ordered_lsm(lsm, origin);
found = true;
}
