Index: sys/compat/linux/linux_misc.h
===================================================================
--- sys/compat/linux/linux_misc.h
+++ sys/compat/linux/linux_misc.h
@@ -50,6 +50,8 @@
 					 * Second arg is a ptr to return the
 					 * signal.
 					 */
+#define	LINUX_PR_GET_DUMPABLE	3
+#define	LINUX_PR_SET_DUMPABLE	4
 #define	LINUX_PR_GET_KEEPCAPS	7	/* Get drop capabilities on setuid */
 #define	LINUX_PR_SET_KEEPCAPS	8	/* Set drop capabilities on setuid */
 #define	LINUX_PR_SET_NAME	15	/* Set process name. */
@@ -57,6 +59,11 @@
 
 #define	LINUX_MAX_COMM_LEN	16	/* Maximum length of the process name. */
 
+/* For GET/SET DUMPABLE */
+#define	LINUX_SUID_DUMP_DISABLE	0	/* Don't coredump setuid processes. */
+#define	LINUX_SUID_DUMP_USER	1	/* Dump as user of process. */
+#define	LINUX_SUID_DUMP_ROOT	2	/* Dump as root. */
+
 #define	LINUX_MREMAP_MAYMOVE	1
 #define	LINUX_MREMAP_FIXED	2
 
Index: sys/compat/linux/linux_misc.c
===================================================================
--- sys/compat/linux/linux_misc.c
+++ sys/compat/linux/linux_misc.c
@@ -1893,7 +1893,7 @@
 	int error = 0, max_size;
 	struct proc *p = td->td_proc;
 	char comm[LINUX_MAX_COMM_LEN];
-	int pdeath_signal;
+	int pdeath_signal, trace_state;
 
 	switch (args->option) {
 	case LINUX_PR_SET_PDEATHSIG:
@@ -1912,6 +1912,40 @@
 		    (void *)(register_t)args->arg2,
 		    sizeof(pdeath_signal)));
 		break;
+	/*
+	 * As far as I can tell, in Linux these control two sort of unrelated
+	 * policies: can set[gu]id processes dump, and who should own the
+	 * resulting corefile?  And processes that can not be dumped aldo can
+	 * not be traced.  In FreeBSD, we control the setuid dump
+	 * enable/disable system-wide with 'sugid_coredump,' and tracability
+	 * with P2_NOTRACE (PROC_TRACE_STATUS / PROC_TRACE_CTL_DISABLE).
+	 *
+	 * So, we proxy these knobs to the corresponding PROC_TRACE_* settings.
+	 */
+	case LINUX_PR_GET_DUMPABLE:
+		error = kern_procctl(td, P_PID, 0, PROC_TRACE_STATUS,
+		    &trace_state);
+		if (error != 0)
+			return (error);
+		td->td_retval[0] = (trace_state != -1);
+		break;
+	case LINUX_PR_SET_DUMPABLE:
+		/*
+		 * It is only valid for userspace to set one of these two
+		 * flags, and only one at a time.
+		 */
+		switch (args->arg2) {
+		case LINUX_SUID_DUMP_DISABLE:
+			trace_state = PROC_TRACE_CTL_DISABLE_EXEC;
+			break;
+		case LINUX_SUID_DUMP_USER:
+			trace_state = PROC_TRACE_CTL_ENABLE;
+			break;
+		default:
+			return (EINVAL);
+		}
+		return (kern_procctl(td, P_PID, 0, PROC_TRACE_CTL,
+		    &trace_state));
 	case LINUX_PR_GET_KEEPCAPS:
 		/*
 		 * Indicate that we always clear the effective and