fuse: move fuse_xattr_handlers to .rodata

This makes it harder for accidental or malicious changes to
fuse_xattr_handlers at runtime.

Cc: Miklos Szeredi <miklos@szeredi.hu>
Cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Wedson Almeida Filho <walmeida@microsoft.com>
Link: https://lore.kernel.org/r/20230930050033.41174-12-wedsonaf@gmail.comSigned-off-by: Christian Brauner <brauner@kernel.org>

fs/fuse/fuse_i.h

@@ -1284,7 +1284,7 @@ ssize_t fuse_getxattr(struct inode *inode, const char *name, void *value,
 		      size_t size);
 ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size);
 int fuse_removexattr(struct inode *inode, const char *name);
-extern const struct xattr_handler *fuse_xattr_handlers[];
+extern const struct xattr_handler * const fuse_xattr_handlers[];
 
 struct posix_acl;
 struct posix_acl *fuse_get_inode_acl(struct inode *inode, int type, bool rcu);

fs/fuse/xattr.c

@@ -209,7 +209,7 @@ static const struct xattr_handler fuse_xattr_handler = {
 	.set    = fuse_xattr_set,
 };
 
-const struct xattr_handler *fuse_xattr_handlers[] = {
+const struct xattr_handler * const fuse_xattr_handlers[] = {
 	&fuse_xattr_handler,
 	NULL
 };