[Linux-ima-user] [RFC][PATCH 10/14] fs: add evm_inode_post_init calls

[Mimi Z. <zo...@li...>]

After creating the initial LSM security extended attribute, call
evm_inode_post_init_security() to create the 'security.evm'
extended attribute.

(Support for other fs still needed.)

Signed-off-by: Mimi Zohar <zo...@us...>
Acked-by: Serge Hallyn <se...@us...>

diff --git a/fs/ext2/xattr_security.c b/fs/ext2/xattr_security.c
index c815584..3987a1b 100644
--- a/fs/ext2/xattr_security.c
+++ b/fs/ext2/xattr_security.c
@@ -8,6 +8,7 @@
 #include <linux/fs.h>
 #include <linux/ext2_fs.h>
 #include <linux/security.h>
+#include <linux/evm.h>
 #include "xattr.h"
 
 static size_t
@@ -49,21 +50,37 @@ int
 ext2_init_security(struct inode *inode, struct inode *dir)
 {
 	int err;
-	size_t len;
-	void *value;
-	char *name;
+	struct xattr lsm_xattr;
+	struct xattr evm_xattr;
 
-	err = security_inode_init_security(inode, dir, &name, &value, &len);
+	err = security_inode_init_security(inode, dir, &lsm_xattr.name,
+					   &lsm_xattr.value,
+					   &lsm_xattr.value_len);
 	if (err) {
 		if (err == -EOPNOTSUPP)
 			return 0;
 		return err;
 	}
 	err = ext2_xattr_set(inode, EXT2_XATTR_INDEX_SECURITY,
-			     name, value, len, 0);
-	kfree(name);
-	kfree(value);
+			     lsm_xattr.name, lsm_xattr.value,
+			     lsm_xattr.value_len, 0);
+	if (err < 0)
+		goto out;
+
+	err = evm_inode_post_init_security(inode, &lsm_xattr, &evm_xattr);
+	if (err)
+		goto out;
+	err = ext2_xattr_set(inode, EXT2_XATTR_INDEX_SECURITY,
+			     evm_xattr.name, evm_xattr.value,
+			     evm_xattr.value_len, 0);
+	kfree(evm_xattr.value);
+out:
+	kfree(lsm_xattr.name);
+	kfree(lsm_xattr.value);
+	if (err == -EOPNOTSUPP)
+		return 0;
 	return err;
+
 }
 
 struct xattr_handler ext2_xattr_security_handler = {
diff --git a/fs/ext3/xattr_security.c b/fs/ext3/xattr_security.c
index 4743487..eba57a9 100644
--- a/fs/ext3/xattr_security.c
+++ b/fs/ext3/xattr_security.c
@@ -9,6 +9,7 @@
 #include <linux/ext3_jbd.h>
 #include <linux/ext3_fs.h>
 #include <linux/security.h>
+#include <linux/evm.h>
 #include "xattr.h"
 
 static size_t
@@ -51,20 +52,35 @@ int
 ext3_init_security(handle_t *handle, struct inode *inode, struct inode *dir)
 {
 	int err;
-	size_t len;
-	void *value;
-	char *name;
+	struct xattr lsm_xattr;
+	struct xattr evm_xattr;
 
-	err = security_inode_init_security(inode, dir, &name, &value, &len);
+	err = security_inode_init_security(inode, dir, &lsm_xattr.name,
+					   &lsm_xattr.value,
+					   &lsm_xattr.value_len);
 	if (err) {
 		if (err == -EOPNOTSUPP)
 			return 0;
 		return err;
 	}
 	err = ext3_xattr_set_handle(handle, inode, EXT3_XATTR_INDEX_SECURITY,
-				    name, value, len, 0);
-	kfree(name);
-	kfree(value);
+				    lsm_xattr.name, lsm_xattr.value,
+				    lsm_xattr.value_len, 0);
+	if (err < 0)
+		goto out;
+
+	err = evm_inode_post_init_security(inode, &lsm_xattr, &evm_xattr);
+	if (err)
+		goto out;
+	err = ext3_xattr_set_handle(handle, inode, EXT3_XATTR_INDEX_SECURITY,
+				    evm_xattr.name, evm_xattr.value,
+				    evm_xattr.value_len, 0);
+	kfree(evm_xattr.value);
+out:
+	kfree(lsm_xattr.name);
+	kfree(lsm_xattr.value);
+	if (err == -EOPNOTSUPP)
+		return 0;
 	return err;
 }
 
diff --git a/fs/ext4/xattr_security.c b/fs/ext4/xattr_security.c
index 983c253..d8ecbee 100644
--- a/fs/ext4/xattr_security.c
+++ b/fs/ext4/xattr_security.c
@@ -7,6 +7,7 @@
 #include <linux/string.h>
 #include <linux/fs.h>
 #include <linux/security.h>
+#include <linux/evm.h>
 #include "ext4_jbd2.h"
 #include "ext4.h"
 #include "xattr.h"
@@ -51,20 +52,35 @@ int
 ext4_init_security(handle_t *handle, struct inode *inode, struct inode *dir)
 {
 	int err;
-	size_t len;
-	void *value;
-	char *name;
+	struct xattr lsm_xattr;
+	struct xattr evm_xattr;
 
-	err = security_inode_init_security(inode, dir, &name, &value, &len);
+	err = security_inode_init_security(inode, dir, &lsm_xattr.name,
+					   &lsm_xattr.value,
+					   &lsm_xattr.value_len);
 	if (err) {
 		if (err == -EOPNOTSUPP)
 			return 0;
 		return err;
 	}
 	err = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_SECURITY,
-				    name, value, len, 0);
-	kfree(name);
-	kfree(value);
+				    lsm_xattr.name, lsm_xattr.value,
+				    lsm_xattr.value_len, 0);
+	if (err < 0)
+		goto out;
+
+	err = evm_inode_post_init_security(inode, &lsm_xattr, &evm_xattr);
+	if (err)
+		goto out;
+	err = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_SECURITY,
+				    evm_xattr.name, evm_xattr.value,
+				    evm_xattr.value_len, 0);
+	kfree(evm_xattr.value);
+out:
+	kfree(lsm_xattr.name);
+	kfree(lsm_xattr.value);
+	if (err == -EOPNOTSUPP)
+		return 0;
 	return err;
 }
 
-- 
1.6.6