Btrfs: selinux support

Add call to LSM security initialization and save
resulting security xattr for new inodes.

Add xattr support to symlink inode ops.

Set inode->i_op for existing special files.

Signed-off-by: jim owens <jowens@hp.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/fs/btrfs/xattr.c b/fs/btrfs/xattr.c
index b4fa5f4b6ad1..312b9435e9f8 100644
--- a/fs/btrfs/xattr.c
+++ b/fs/btrfs/xattr.c
@@ -21,6 +21,7 @@
 #include <linux/slab.h>
 #include <linux/rwsem.h>
 #include <linux/xattr.h>
+#include <linux/security.h>
 #include "ctree.h"
 #include "btrfs_inode.h"
 #include "transaction.h"
@@ -330,3 +331,34 @@ int btrfs_removexattr(struct dentry *dentry, const char *name)
                 return -EOPNOTSUPP;
         return __btrfs_setxattr(dentry->d_inode, name, NULL, 0, XATTR_REPLACE);
 }
+
+int btrfs_xattr_security_init(struct inode *inode, struct inode *dir)
+{
+        int err;
+        size_t len;
+        void *value;
+        char *suffix;
+        char *name;
+
+        err = security_inode_init_security(inode, dir, &suffix, &value, &len);
+        if (err) {
+                if (err == -EOPNOTSUPP)
+                        return 0;
+                return err;
+        }
+
+        name = kmalloc(XATTR_SECURITY_PREFIX_LEN + strlen(suffix) + 1,
+                       GFP_NOFS);
+        if (!name) {
+                err = -ENOMEM;
+        } else {
+                strcpy(name, XATTR_SECURITY_PREFIX);
+                strcpy(name + XATTR_SECURITY_PREFIX_LEN, suffix);
+                err = __btrfs_setxattr(inode, name, value, len, 0);
+                kfree(name);
+        }
+
+        kfree(suffix);
+        kfree(value);
+        return err;
+}