Index: head/sys/compat/linux/linux_misc.h
===================================================================
--- head/sys/compat/linux/linux_misc.h
+++ head/sys/compat/linux/linux_misc.h
@@ -54,6 +54,8 @@
 #define	LINUX_PR_SET_KEEPCAPS	8	/* Set drop capabilities on setuid */
 #define	LINUX_PR_SET_NAME	15	/* Set process name. */
 #define	LINUX_PR_GET_NAME	16	/* Get process name. */
+#define	LINUX_PR_GET_SECCOMP	21
+#define	LINUX_PR_SET_SECCOMP	22
 
 #define	LINUX_MAX_COMM_LEN	16	/* Maximum length of the process name. */
 
Index: head/sys/compat/linux/linux_misc.c
===================================================================
--- head/sys/compat/linux/linux_misc.c
+++ head/sys/compat/linux/linux_misc.c
@@ -2001,7 +2001,15 @@
 		error = copyout(comm, (void *)(register_t)args->arg2,
 		    strlen(comm) + 1);
 		break;
+	case LINUX_PR_GET_SECCOMP:
+	case LINUX_PR_SET_SECCOMP:
+		/*
+		 * Same as returned by Linux without CONFIG_SECCOMP enabled.
+		 */
+		error = EINVAL;
+		break;
 	default:
+		linux_msg(td, "unsupported prctl option %d", args->option);
 		error = EINVAL;
 		break;
 	}