diff --git a/sys/kern/kern_descrip.c b/sys/kern/kern_descrip.c
--- a/sys/kern/kern_descrip.c
+++ b/sys/kern/kern_descrip.c
@@ -908,6 +908,33 @@
 		free(kif, M_TEMP);
 		break;
 
+	case F_DUP_OPATH:
+		tmp = arg;
+		error = fget_unlocked(td, fd, &cap_no_rights, &fp);
+		if (error != 0)
+			break;
+		if (fp->f_type == DTYPE_VNODE) {
+			error = falloc_noinstall(td, &fp2);
+			if (error == 0) {
+				int indx;
+
+				fp2->f_vnode = fp->f_vnode;
+				vref(fp2->f_vnode);
+				finit(fp2, fp->f_flag & (FMASK | FKQALLOWED),
+				    DTYPE_VNODE, NULL, &path_fileops);
+				error = finstall_refed(td, fp2, &indx, tmp,
+				    NULL);
+				if (error == 0)
+					td->td_retval[0] = indx;
+				else
+					falloc_abort(td, fp2);
+			}
+		} else {
+			error = EINVAL;
+		}
+		fdrop(fp, td);
+		break;
+
 	default:
 		error = EINVAL;
 		break;
diff --git a/sys/sys/fcntl.h b/sys/sys/fcntl.h
--- a/sys/sys/fcntl.h
+++ b/sys/sys/fcntl.h
@@ -269,6 +269,7 @@
 #define	F_GET_SEALS	20
 #define	F_ISUNIONSTACK	21		/* Kludge for libc, don't use it. */
 #define	F_KINFO		22		/* Return kinfo_file for this fd */
+#define	F_DUP_OPATH	23		/* Dup fd to O_PATH-like */
 
 /* Seals (F_ADD_SEALS, F_GET_SEALS). */
 #define	F_SEAL_SEAL	0x0001		/* Prevent adding sealings */