linux-kernel - [RFC][PATCH v1 6/9] ima: add inode_post

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Date:	Mon, 30 Jan 2012 17:14:01 -0500
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	linux-security-module@...r.kernel.org
Cc:	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	David Safford <safford@...son.ibm.com>,
	Dmitry Kasatkin <dmitry.kasatkin@...el.com>,
	Mimi Zohar <zohar@...ibm.com>
Subject: [RFC][PATCH v1 6/9] ima: add inode_post_setattr call

Changing an inode's metadata may result in our not needing to appraise
the file.  In such cases, we must remove 'security.ima'.

Changelog v1:
- use ima_inode_post_setattr() stub function, if IMA_APPRAISE not configured

Signed-off-by: Mimi Zohar <zohar@...ibm.com>
Acked-by: Serge Hallyn <serge.hallyn@...ntu.com>
---
 fs/attr.c           |    2 ++
 include/linux/ima.h |   10 ++++++++++
 2 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/fs/attr.c b/fs/attr.c
index d9bd7fc..f496bac 100644
--- a/fs/attr.c
+++ b/fs/attr.c
@@ -14,6 +14,7 @@
 #include <linux/fcntl.h>
 #include <linux/security.h>
 #include <linux/evm.h>
+#include <linux/ima.h>
 
 /**
  * inode_change_ok - check if attribute changes to an inode are allowed
@@ -245,6 +246,7 @@ int notify_change(struct dentry * dentry, struct iattr * attr)
 
 	if (!error) {
 		fsnotify_change(dentry, ia_valid);
+		ima_inode_post_setattr(dentry);
 		evm_inode_post_setattr(dentry, ia_valid);
 	}
 
diff --git a/include/linux/ima.h b/include/linux/ima.h
index 6ac8e50..e2bfbb1 100644
--- a/include/linux/ima.h
+++ b/include/linux/ima.h
@@ -39,5 +39,15 @@ static inline int ima_file_mmap(struct file *file, unsigned long prot)
 {
 	return 0;
 }
+
 #endif /* CONFIG_IMA_H */
+
+#ifdef CONFIG_IMA_APPRAISE
+extern void ima_inode_post_setattr(struct dentry *dentry);
+#else
+static inline void ima_inode_post_setattr(struct dentry *dentry)
+{
+	return;
+}
+#endif /* CONFIG_IMA_APPRAISE_H */
 #endif /* _LINUX_IMA_H */
-- 
1.7.6.5

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