[PATCH v3 4/6] integrity: provide hook to load keys when rootfs is ready

[Dmitry Kasatkin]

Keys can only be loaded when rootfs is mounted. Initcalls
are not suitable for that. Provide a special hook.

Changes in v2:
* Hook renamed as 'integrity_load_keys()' to handle both IMA and EVM
  keys by integrity subsystem.
* Hook patch moved after defining loading functions

Signed-off-by: Dmitry Kasatkin <d.kasatkin@xxxxxxxxxxx>
---
 include/linux/integrity.h |  6 ++++++
 init/main.c               |  6 +++++-
 security/integrity/iint.c | 11 +++++++++++
 3 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/include/linux/integrity.h b/include/linux/integrity.h
index 83222ce..c2d6082 100644
--- a/include/linux/integrity.h
+++ b/include/linux/integrity.h
@@ -24,6 +24,7 @@ enum integrity_status {
 #ifdef CONFIG_INTEGRITY
 extern struct integrity_iint_cache *integrity_inode_get(struct inode *inode);
 extern void integrity_inode_free(struct inode *inode);
+extern void __init integrity_load_keys(void);
 
 #else
 static inline struct integrity_iint_cache *
@@ -36,5 +37,10 @@ static inline void integrity_inode_free(struct inode *inode)
 {
 	return;
 }
+
+static inline void integrity_load_keys(void)
+{
+}
 #endif /* CONFIG_INTEGRITY */
+
 #endif /* _LINUX_INTEGRITY_H */
diff --git a/init/main.c b/init/main.c
index e8ae1fe..2c1928d 100644
--- a/init/main.c
+++ b/init/main.c
@@ -78,6 +78,7 @@
 #include <linux/context_tracking.h>
 #include <linux/random.h>
 #include <linux/list.h>
+#include <linux/integrity.h>
 
 #include <asm/io.h>
 #include <asm/bugs.h>
@@ -1026,8 +1027,11 @@ static noinline void __init kernel_init_freeable(void)
 	 * Ok, we have completed the initial bootup, and
 	 * we're essentially up and running. Get rid of the
 	 * initmem segments and start the user-mode stuff..
+	 *
+	 * rootfs is available now, try loading the public keys
+	 * and default modules
 	 */
 
-	/* rootfs is available now, try loading default modules */
+	integrity_load_keys();
 	load_default_modules();
 }
diff --git a/security/integrity/iint.c b/security/integrity/iint.c
index 0a76686..a1f5cd1 100644
--- a/security/integrity/iint.c
+++ b/security/integrity/iint.c
@@ -245,3 +245,14 @@ out:
 	fput(file);
 	return rc;
 }
+
+/*
+ * integrity_load_keys - load integrity keys hook
+ *
+ * Hooks is called from init/main.c:kernel_init_freeable()
+ * when rootfs is ready
+ */
+void __init integrity_load_keys(void)
+{
+	ima_load_x509();
+}
-- 
1.9.1

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