File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/fs/reiserfs/xattr_trusted.c b/fs/reiserfs/xattr_trusted.c
new file mode 100644
index 0000000..ebba1eb
--- /dev/null
+++ b/fs/reiserfs/xattr_trusted.c
@@ -0,0 +1,55 @@
+#include "reiserfs.h"
+#include <linux/capability.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/pagemap.h>
+#include <linux/xattr.h>
+#include "xattr.h"
+#include <linux/uaccess.h>
+
+static int
+trusted_get(const struct xattr_handler *handler, struct dentry *dentry,
+ const char *name, void *buffer, size_t size)
+{
+ if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(d_inode(dentry)))
+ return -EPERM;
+
+ return reiserfs_xattr_get(d_inode(dentry),
+ xattr_full_name(handler, name),
+ buffer, size);
+}
+
+static int
+trusted_set(const struct xattr_handler *handler, struct dentry *dentry,
+ const char *name, const void *buffer, size_t size, int flags)
+{
+ if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(d_inode(dentry)))
+ return -EPERM;
+
+ return reiserfs_xattr_set(d_inode(dentry),
+ xattr_full_name(handler, name),
+ buffer, size, flags);
+}
+
+static size_t trusted_list(const struct xattr_handler *handler,
+ struct dentry *dentry, char *list, size_t list_size,
+ const char *name, size_t name_len)
+{
+ const size_t len = name_len + 1;
+
+ if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(d_inode(dentry)))
+ return 0;
+
+ if (list && len <= list_size) {
+ memcpy(list, name, name_len);
+ list[name_len] = '\0';
+ }
+ return len;
+}
+
+const struct xattr_handler reiserfs_xattr_trusted_handler = {
+ .prefix = XATTR_TRUSTED_PREFIX,
+ .get = trusted_get,
+ .set = trusted_set,
+ .list = trusted_list,
+};