[PATCH] ext2: Enable atomic inode security labeling

This patch modifies ext2 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.  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>

diff --git a/fs/ext2/ialloc.c b/fs/ext2/ialloc.c
index 161f156..c8d0703 100644 (file)
--- a/fs/ext2/ialloc.c
+++ b/fs/ext2/ialloc.c
@@ -615,6 +615,11 @@ got:
                DQUOT_DROP(inode);
                goto fail2;
        }
+       err = ext2_init_security(inode,dir);
+       if (err) {
+               DQUOT_FREE_INODE(inode);
+               goto fail2;
+       }
        mark_inode_dirty(inode);
        ext2_debug("allocating inode %lu\n", inode->i_ino);
        ext2_preread_inode(inode);

diff --git a/fs/ext2/xattr.h b/fs/ext2/xattr.h
index 5f3bfde..67cfeb6 100644 (file)
--- a/fs/ext2/xattr.h
+++ b/fs/ext2/xattr.h
@@ -116,3 +116,11 @@ exit_ext2_xattr(void)
 
 # endif  /* CONFIG_EXT2_FS_XATTR */
 
+#ifdef CONFIG_EXT2_FS_SECURITY
+extern int ext2_init_security(struct inode *inode, struct inode *dir);
+#else
+static inline int ext2_init_security(struct inode *inode, struct inode *dir)
+{
+       return 0;
+}
+#endif

diff --git a/fs/ext2/xattr_security.c b/fs/ext2/xattr_security.c
index 6a6c59f..a266127 100644 (file)
--- a/fs/ext2/xattr_security.c
+++ b/fs/ext2/xattr_security.c
@@ -8,6 +8,7 @@
 #include <linux/fs.h>
 #include <linux/smp_lock.h>
 #include <linux/ext2_fs.h>
+#include <linux/security.h>
 #include "xattr.h"
 
 static size_t
@@ -45,6 +46,27 @@ ext2_xattr_security_set(struct inode *inode, const char *name,
                              value, size, flags);
 }
 
+int
+ext2_init_security(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 = ext2_xattr_set(inode, EXT2_XATTR_INDEX_SECURITY,
+                            name, value, len, 0);
+       kfree(name);
+       kfree(value);
+       return err;
+}
+
 struct xattr_handler ext2_xattr_security_handler = {
        .prefix = XATTR_SECURITY_PREFIX,
        .list   = ext2_xattr_security_list,