linux-kernel - [PATCH 07/14] evm: inode post removexattr

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Date:	Wed, 21 Apr 2010 17:49:47 -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 07/14] evm: inode post removexattr

When an EVM protected extended attribute is removed, update 'security.evm'.

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

diff --git a/fs/xattr.c b/fs/xattr.c
index 341ad71..9372e77 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -14,6 +14,7 @@
 #include <linux/mount.h>
 #include <linux/namei.h>
 #include <linux/security.h>
+#include <linux/evm.h>
 #include <linux/syscalls.h>
 #include <linux/module.h>
 #include <linux/fsnotify.h>
@@ -294,8 +295,10 @@ vfs_removexattr(struct dentry *dentry, const char *name)
 	error = inode->i_op->removexattr(dentry, name);
 	mutex_unlock(&inode->i_mutex);
 
-	if (!error)
+	if (!error) {
 		fsnotify_xattr(dentry);
+		evm_inode_post_removexattr(dentry, name);
+	}
 	return error;
 }
 EXPORT_SYMBOL_GPL(vfs_removexattr);
diff --git a/include/linux/evm.h b/include/linux/evm.h
index 1a30beb..93edadd 100644
--- a/include/linux/evm.h
+++ b/include/linux/evm.h
@@ -22,6 +22,8 @@ extern void evm_inode_post_setxattr(struct dentry *dentry,
 				    const void *xattr_value,
 				    size_t xattr_value_len);
 extern int evm_inode_removexattr(struct dentry *dentry, const char *xattr_name);
+extern void evm_inode_post_removexattr(struct dentry *dentry,
+				       const char *xattr_name);
 #else
 static enum integrity_status evm_verifyxattr(struct dentry *dentry,
 					     char *xattr_name,
@@ -50,5 +52,12 @@ static inline int evm_inode_removexattr(struct dentry *dentry,
 {
 	return 0;
 }
+
+static inline void evm_inode_post_removexattr(struct dentry *dentry,
+					      const char *xattr_name)
+{
+	return;
+}
+
 #endif /* CONFIG_EVM_H */
 #endif /* LINUX_EVM_H */
-- 
1.6.6.1

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