From ac50960afa31877493add6d941d8402fa879c452 Mon Sep 17 00:00:00 2001
From: Stephen Smalley <sds@tycho.nsa.gov>
Date: Fri, 9 Sep 2005 13:01:41 -0700
Subject: [PATCH] ext3: Enable atomic inode security labeling

This patch modifies ext3 to call the inode_init_security LSM hook to obtain
the security attribute for a newly created inode and to set the resulting
attribute on the new inode as part of the same transaction.  This parallels
the existing processing for setting ACLs on newly created inodes.

Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
 fs/ext3/ialloc.c         |  5 +++++
 fs/ext3/xattr.h          | 11 +++++++++++
 fs/ext3/xattr_security.c | 22 ++++++++++++++++++++++
 3 files changed, 38 insertions(+)

diff --git a/fs/ext3/ialloc.c b/fs/ext3/ialloc.c
index 6981bd014ede9f..96552769d039e6 100644
--- a/fs/ext3/ialloc.c
+++ b/fs/ext3/ialloc.c
@@ -607,6 +607,11 @@ got:
 		DQUOT_DROP(inode);
 		goto fail2;
   	}
+	err = ext3_init_security(handle,inode, dir);
+	if (err) {
+		DQUOT_FREE_INODE(inode);
+		goto fail2;
+	}
 	err = ext3_mark_inode_dirty(handle, inode);
 	if (err) {
 		ext3_std_error(sb, err);
diff --git a/fs/ext3/xattr.h b/fs/ext3/xattr.h
index eb31a69e82dc93..2ceae38f3d4972 100644
--- a/fs/ext3/xattr.h
+++ b/fs/ext3/xattr.h
@@ -133,3 +133,14 @@ exit_ext3_xattr(void)
 #define ext3_xattr_handlers	NULL
 
 # endif  /* CONFIG_EXT3_FS_XATTR */
+
+#ifdef CONFIG_EXT3_FS_SECURITY
+extern int ext3_init_security(handle_t *handle, struct inode *inode,
+				struct inode *dir);
+#else
+static inline int ext3_init_security(handle_t *handle, struct inode *inode,
+				struct inode *dir)
+{
+	return 0;
+}
+#endif
diff --git a/fs/ext3/xattr_security.c b/fs/ext3/xattr_security.c
index ddc1c41750e140..b9c40c15647bb7 100644
--- a/fs/ext3/xattr_security.c
+++ b/fs/ext3/xattr_security.c
@@ -9,6 +9,7 @@
 #include <linux/smp_lock.h>
 #include <linux/ext3_jbd.h>
 #include <linux/ext3_fs.h>
+#include <linux/security.h>
 #include "xattr.h"
 
 static size_t
@@ -47,6 +48,27 @@ ext3_xattr_security_set(struct inode *inode, const char *name,
 			      value, size, flags);
 }
 
+int
+ext3_init_security(handle_t *handle, struct inode *inode, struct inode *dir)
+{
+	int err;
+	size_t len;
+	void *value;
+	char *name;
+
+	err = security_inode_init_security(inode, dir, &name, &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);
+	return err;
+}
+
 struct xattr_handler ext3_xattr_security_handler = {
 	.prefix	= XATTR_SECURITY_PREFIX,
 	.list	= ext3_xattr_security_list,
-- 
cgit 1.2.3-korg