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LSM: Introduce enum lsm_order

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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 <[email protected]>
This commit is contained in:
Kees Cook 2018-09-19 17:48:21 -07:00
commit e2bc445b66
2 changed files with 14 additions and 1 deletions
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9
security/security.c
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@ -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;
}