[PATCH v4 1/3] security: lsm: Allow LSMs to register for late_initcall_sync init

[Yeoreum Yun <yeoreum.yun@arm.com>]

There are situations where LSMs have dependencies that might mean they
want to be initialised later in the boot process, to ensure those
dependencies are available. In particular there are some TPM setups (Arm
FF-A devices, SPI attached TPMs) required by IMA which are not
guaranteed to be initialised for regular initcall_late.

Add an initcall_late_sync option that can be used in these situations.

Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
---
 include/linux/lsm_hooks.h |  2 ++
 security/lsm_init.c       | 13 +++++++++++--
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index b4f8cad53ddb..c4488c4a6d8a 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -167,6 +167,7 @@ enum lsm_order {
  * @initcall_fs: LSM callback for fs_initcall setup, optional
  * @initcall_device: LSM callback for device_initcall() setup, optional
  * @initcall_late: LSM callback for late_initcall() setup, optional
+ * @initcall_late_sync: LSM callback for late_initcall_sync() setup, optional
  */
 struct lsm_info {
 	const struct lsm_id *id;
@@ -182,6 +183,7 @@ struct lsm_info {
 	int (*initcall_fs)(void);
 	int (*initcall_device)(void);
 	int (*initcall_late)(void);
+	int (*initcall_late_sync)(void);
 };
 
 #define DEFINE_LSM(lsm)							\
diff --git a/security/lsm_init.c b/security/lsm_init.c
index 7c0fd17f1601..a1ad641811de 100644
--- a/security/lsm_init.c
+++ b/security/lsm_init.c
@@ -556,13 +556,22 @@ device_initcall(security_initcall_device);
  * security_initcall_late - Run the LSM late initcalls
  */
 static int __init security_initcall_late(void)
+{
+	return lsm_initcall(late);
+}
+late_initcall(security_initcall_late);
+
+/**
+ * security_initcall_late_sync - Run the LSM late initcalls sync
+ */
+static int __init security_initcall_late_sync(void)
 {
 	int rc;
 
-	rc = lsm_initcall(late);
+	rc = lsm_initcall(late_sync);
 	lsm_pr_dbg("all enabled LSMs fully activated\n");
 	call_blocking_lsm_notifier(LSM_STARTED_ALL, NULL);
 
 	return rc;
 }
-late_initcall(security_initcall_late);
+late_initcall_sync(security_initcall_late_sync);
-- 
LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}