D57244.id178607.diff
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	Index: sys/kern/kern_sig.c
	===================================================================
	--- sys/kern/kern_sig.c
	+++ sys/kern/kern_sig.c
	@@ -2038,6 +2038,16 @@
	if (pid <= 0)
	return (EINVAL);

	+ /*
	+ * A process in capability mode can send signals only to himself.
	+ */
	+ if (pid != td->td_proc->p_pid) {
	+ if (CAP_TRACING(td))
	+ ktrcapfail(CAPFAIL_SIGNAL, &signum);
	+ if (IN_CAPABILITY_MODE(td))
	+ return (ECAPMODE);
	+ }
	+
	if ((signumf & __SIGQUEUE_TID) == 0) {
	if ((p = pfind_any(pid)) == NULL)
	return (ESRCH);
	Index: tests/sys/capsicum/capmode.cc
	===================================================================
	--- tests/sys/capsicum/capmode.cc
	+++ tests/sys/capsicum/capmode.cc
	@@ -703,8 +703,8 @@
	close(thread_pipe[1]);
	}

	-static volatile sig_atomic_t had_signal = 0;
	-static void handle_signal(int) { had_signal = 1; }
	+static volatile sig_atomic_t signal_cnt = 0;
	+static void handle_signal(int) { signal_cnt++; }

	FORK_TEST(Capmode, SelfKill) {
	pid_t me = getpid();
	@@ -722,7 +722,13 @@
	// Can only kill(2) to own pid.
	EXPECT_CAPMODE(kill(child, SIGUSR1));
	EXPECT_OK(kill(me, SIGUSR1));
	- EXPECT_EQ(1, had_signal);
	+ EXPECT_EQ(1, signal_cnt);
	+
	+ union sigval sv;
	+ sv.sival_int = 0x1234;
	+ EXPECT_CAPMODE(sigqueue(child, SIGUSR1, sv);
	+ EXPECT_OK(sigqueue(child, SIGUSR1, sv);
	+ EXPECT_EQ(2, signal_cnt);

	signal(SIGUSR1, original);
	}