linux-kernel - [PATCH v1 1/4] ima: provide hook to load IMA keys when rootfs is ready

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Message-id: <2b20badc350112abc405751e67a7eaf3e3932358.1405428802.git.d.kasatkin@samsung.com>
Date:	Tue, 15 Jul 2014 15:54:20 +0300
From:	Dmitry Kasatkin <d.kasatkin@...sung.com>
To:	zohar@...ux.vnet.ibm.com, linux-ima-devel@...ts.sourceforge.net,
	linux-security-module@...r.kernel.org, akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, dhowells@...hat.com,
	dmitry.kasatkin@...il.com, Dmitry Kasatkin <d.kasatkin@...sung.com>
Subject: [PATCH v1 1/4] ima: provide hook to load IMA keys when rootfs is ready

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

Signed-off-by: Dmitry Kasatkin <d.kasatkin@...sung.com>
---
 include/linux/ima.h | 9 +++++++++
 init/main.c         | 6 +++++-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/include/linux/ima.h b/include/linux/ima.h
index 23a87a4..b617c1a 100644
--- a/include/linux/ima.h
+++ b/include/linux/ima.h
@@ -73,4 +73,13 @@ static inline int ima_inode_removexattr(struct dentry *dentry,
 	return 0;
 }
 #endif /* CONFIG_IMA_APPRAISE */
+
+#ifdef CONFIG_IMA_APPRAISE_SIGNED_INIT
+extern void __init ima_prepare_keys(void);
+#else
+static inline void ima_prepare_keys(void)
+{
+}
+#endif
+
 #endif /* _LINUX_IMA_H */
diff --git a/init/main.c b/init/main.c
index e8ae1fe..b24cfaa 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/ima.h>
 
 #include <asm/io.h>
 #include <asm/bugs.h>
@@ -1028,6 +1029,9 @@ static noinline void __init kernel_init_freeable(void)
 	 * initmem segments and start the user-mode stuff..
 	 */
 
-	/* rootfs is available now, try loading default modules */
+	/* rootfs is available now */
+	/* try loading public keys */
+	ima_prepare_keys();
+	/* try loading default modules */
 	load_default_modules();
 }
-- 
1.9.1

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