linux-kernel - [PATCH 08/14] evm: imbed evm_inode_post

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Date:	Wed, 21 Apr 2010 17:49:48 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-security-module@...r.kernel.org,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	James Morris <jmorris@...ei.org>,
	David Safford <safford@...son.ibm.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Mimi Zohar <zohar@...ibm.com>
Subject: [PATCH 08/14] evm: imbed evm_inode_post_setattr

Changing the inode's metadata may require the 'security.evm' extended
attribute to be re-calculated and updated.

Signed-off-by: Mimi Zohar <zohar@...ibm.com>
Acked-by: Serge Hallyn <serue@...ibm.com>

diff --git a/fs/attr.c b/fs/attr.c
index 0815e93..5d9ff4e 100644
--- a/fs/attr.c
+++ b/fs/attr.c
@@ -13,6 +13,7 @@
 #include <linux/fsnotify.h>
 #include <linux/fcntl.h>
 #include <linux/security.h>
+#include <linux/evm.h>
 
 /* Taken over from the old code... */
 
@@ -218,8 +219,10 @@ int notify_change(struct dentry * dentry, struct iattr * attr)
 	if (ia_valid & ATTR_SIZE)
 		up_write(&dentry->d_inode->i_alloc_sem);
 
-	if (!error)
+	if (!error) {
 		fsnotify_change(dentry, ia_valid);
+		evm_inode_post_setattr(dentry, ia_valid);
+	}
 
 	return error;
 }
diff --git a/include/linux/evm.h b/include/linux/evm.h
index 93edadd..8626263 100644
--- a/include/linux/evm.h
+++ b/include/linux/evm.h
@@ -15,6 +15,7 @@ extern enum integrity_status evm_verifyxattr(struct dentry *dentry,
 					     char *xattr_name,
 					     char *xattr_value,
 					     size_t xattr_value_len);
+extern void evm_inode_post_setattr(struct dentry *dentry, int ia_valid);
 extern int evm_inode_setxattr(struct dentry *dentry, const char *name,
 			      const void *value, size_t size);
 extern void evm_inode_post_setxattr(struct dentry *dentry,
@@ -33,6 +34,11 @@ static enum integrity_status evm_verifyxattr(struct dentry *dentry,
 	return INTEGRITY_UNKNOWN;
 }
 
+static inline void evm_inode_post_setattr(struct dentry *dentry, int ia_valid)
+{
+	return;
+}
+
 static inline int evm_inode_setxattr(struct dentry *dentry, const char *name,
 				     const void *value, size_t size)
 {
-- 
1.6.6.1

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