Index: sys/compat/linux/linux_file.c
===================================================================
--- sys/compat/linux/linux_file.c
+++ sys/compat/linux/linux_file.c
@@ -1738,8 +1738,18 @@
 	char *path;
 	int error, dfd, flag;
 
-	if (args->flag & ~LINUX_AT_SYMLINK_NOFOLLOW)
+	if (args->flag & ~(LINUX_AT_SYMLINK_NOFOLLOW | LINUX_AT_EMPTY_PATH)) {
+		linux_msg(td, "fchownat unsupported flag 0x%x", args->flag);
 		return (EINVAL);
+	}
+
+	if (args->flag & LINUX_AT_EMPTY_PATH) {
+		if (args->dfd == AT_FDCWD) {
+			linux_msg(td, "unsupported fchownat with AT_FDCWD");
+			return (EBADF);
+		}
+		return (kern_fchown(td, args->dfd, args->uid, args->gid));
+	}
 
 	dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD :  args->dfd;
 	flag = (args->flag & LINUX_AT_SYMLINK_NOFOLLOW) == 0 ? 0 :
Index: sys/kern/vfs_syscalls.c
===================================================================
--- sys/kern/vfs_syscalls.c
+++ sys/kern/vfs_syscalls.c
@@ -3023,16 +3023,23 @@
 #endif
 int
 sys_fchown(struct thread *td, struct fchown_args *uap)
+{
+
+	return (kern_fchown(td, uap->fd, uap->uid, uap->gid));
+}
+
+int
+kern_fchown(struct thread *td, int fd, int uid, int gid)
 {
 	struct file *fp;
 	int error;
 
-	AUDIT_ARG_FD(uap->fd);
-	AUDIT_ARG_OWNER(uap->uid, uap->gid);
-	error = fget(td, uap->fd, &cap_fchown_rights, &fp);
+	AUDIT_ARG_FD(fd);
+	AUDIT_ARG_OWNER(uid, gid);
+	error = fget(td, fd, &cap_fchown_rights, &fp);
 	if (error != 0)
 		return (error);
-	error = fo_chown(fp, uap->uid, uap->gid, td->td_ucred, td);
+	error = fo_chown(fp, uid, gid, td->td_ucred, td);
 	fdrop(fp, td);
 	return (error);
 }
Index: sys/sys/syscallsubr.h
===================================================================
--- sys/sys/syscallsubr.h
+++ sys/sys/syscallsubr.h
@@ -134,6 +134,7 @@
 	    struct mac *mac_p, struct vmspace *oldvmspace);
 int	kern_fchmodat(struct thread *td, int fd, const char *path,
 	    enum uio_seg pathseg, mode_t mode, int flag);
+int	kern_fchown(struct thread *td, int fd, int uid, int gid);
 int	kern_fchownat(struct thread *td, int fd, const char *path,
 	    enum uio_seg pathseg, int uid, int gid, int flag);
 int	kern_fcntl(struct thread *td, int fd, int cmd, intptr_t arg);