In preparation for removing security_old_inode_init_security(), switch to
security_inode_init_security(). Commit
572302af1258 ("reiserfs: Add missing
calls to reiserfs_security_free()") fixed possible memory leaks and another
issue related to adding an xattr at inode creation time.
Define the initxattrs callback reiserfs_initxattrs(), to populate the
name/value/len triple in the reiserfs_security_handle() with the first
xattr provided by LSMs. Make a copy of the xattr value, as
security_inode_init_security() frees it.
After the call to security_inode_init_security(), remove the check for
returning -EOPNOTSUPP, as security_inode_init_security() changes it to
zero.
Multiple xattrs are currently not supported, as the
reiserfs_security_handle structure is exported to user space. As a
consequence, even if EVM is invoked, it will not provide an xattr (if it
is not the first to set it, its xattr will be discarded; if it is the
first, it does not have xattrs to calculate the HMAC on).
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Reviewed-by: Casey Schaufler <casey@schaufler-ca.com>
Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
return !IS_PRIVATE(d_inode(dentry));
}
+static int
+reiserfs_initxattrs(struct inode *inode, const struct xattr *xattr_array,
+ void *fs_info)
+{
+ struct reiserfs_security_handle *sec = fs_info;
+
+ sec->value = kmemdup(xattr_array->value, xattr_array->value_len,
+ GFP_KERNEL);
+ if (!sec->value)
+ return -ENOMEM;
+
+ sec->name = xattr_array->name;
+ sec->length = xattr_array->value_len;
+ return 0;
+}
+
/* Initializes the security context for a new inode and returns the number
* of blocks needed for the transaction. If successful, reiserfs_security
* must be released using reiserfs_security_free when the caller is done. */
if (IS_PRIVATE(dir))
return 0;
- error = security_old_inode_init_security(inode, dir, qstr, &sec->name,
- &sec->value, &sec->length);
+ error = security_inode_init_security(inode, dir, qstr,
+ &reiserfs_initxattrs, sec);
if (error) {
- if (error == -EOPNOTSUPP)
- error = 0;
-
sec->name = NULL;
sec->value = NULL;
sec->length = 0;