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D41979.id127800.diff
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diff --git a/tests/sys/kern/Makefile b/tests/sys/kern/Makefile
--- a/tests/sys/kern/Makefile
+++ b/tests/sys/kern/Makefile
@@ -27,6 +27,9 @@
ATF_TESTS_C+= reaper
ATF_TESTS_C+= sched_affinity
ATF_TESTS_C+= sigaltstack
+ATF_TESTS_C+= sigsys
+TEST_METADATA.sigsys+= is_exclusive="true"
+TEST_METADATA.sigsys+= required_user="root"
ATF_TESTS_C+= sigwait
ATF_TESTS_C+= socket_accf
ATF_TESTS_C+= socket_msg_trunc
diff --git a/tests/sys/kern/sigsys.c b/tests/sys/kern/sigsys.c
new file mode 100644
--- /dev/null
+++ b/tests/sys/kern/sigsys.c
@@ -0,0 +1,122 @@
+/*-
+ * Copyright (c) 2023 Dmitry Chagin <dchagin@FreeBSD.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <sys/syscall.h>
+#include <sys/sysctl.h>
+
+#include <atf-c.h>
+#include <errno.h>
+#include <signal.h>
+
+static volatile sig_atomic_t signals = 0;
+static volatile sig_atomic_t signo = 0;
+
+static void
+handler(int sig)
+{
+
+ signo = sig;
+ signals++;
+}
+
+static void
+sysctlset(const char *name, int32_t val)
+{
+
+ ATF_REQUIRE(sysctlbyname(name, NULL, NULL, &val, sizeof(val)) == 0);
+}
+
+static void
+test_sigsys(bool sigsys)
+{
+ int error;
+
+ ATF_REQUIRE(signal(SIGSYS, handler) != SIG_ERR);
+
+ /* 11 - obsolete execv */
+ signals = signo = 0;
+ error = syscall(11, 0, 1);
+ ATF_REQUIRE(error == -1);
+ ATF_REQUIRE(errno == ENOSYS);
+ if (sigsys) {
+ ATF_REQUIRE(signals == 1);
+ ATF_REQUIRE(signo == SIGSYS);
+ } else
+ ATF_REQUIRE(signals == 0);
+ /* loadable syscall */
+ signals = signo = 0;
+ error = syscall(SYS_nfssvc, 0, 1);
+ ATF_REQUIRE(error == -1);
+ ATF_REQUIRE(errno == ENOSYS || errno == EINVAL);
+ if (sigsys) {
+ ATF_REQUIRE(signals == 0 || signals == 1);
+ ATF_REQUIRE(signo == SIGSYS || signo == 0);
+ } else
+ ATF_REQUIRE(signals == 0);
+ /* non-existent syscall */
+ signals = signo = 0;
+ error = syscall(SYS_MAXSYSCALL + 1, 0, 1);
+ ATF_REQUIRE(error == -1);
+ ATF_REQUIRE(errno == ENOSYS);
+ if (sigsys) {
+ ATF_REQUIRE(signals == 1);
+ ATF_REQUIRE(signo == SIGSYS);
+ } else
+ ATF_REQUIRE(signals == 0);
+}
+
+/* Test SIGSYS with knob kern.signosys=1 */
+ATF_TC_WITH_CLEANUP(test_sigsys_on);
+ATF_TC_HEAD(test_sigsys_on, tc)
+{
+
+ atf_tc_set_md_var(tc, "require.user", "root");
+ atf_tc_set_md_var(tc, "descr", "Test SIGSYS with kern.signosys on");
+}
+
+ATF_TC_BODY(test_sigsys_on, tc)
+{
+
+ sysctlset("kern.signosys", 1);
+ test_sigsys(true);
+}
+
+ATF_TC_CLEANUP(test_sigsys_on, tc)
+{
+
+ sysctlset("kern.signosys", 1);
+}
+
+/* Test SIGSYS with knob kern.signosys=0 */
+ATF_TC_WITH_CLEANUP(test_sigsys_off);
+ATF_TC_HEAD(test_sigsys_off, tc)
+{
+
+ atf_tc_set_md_var(tc, "require.user", "root");
+ atf_tc_set_md_var(tc, "descr", "Test SIGSYS with kern.signosys off");
+}
+
+ATF_TC_BODY(test_sigsys_off, tc)
+{
+
+ sysctlset("kern.signosys", 0);
+ test_sigsys(false);
+}
+
+ATF_TC_CLEANUP(test_sigsys_off, tc)
+{
+
+ sysctlset("kern.signosys", 1);
+}
+
+ATF_TP_ADD_TCS(tp)
+{
+
+ ATF_TP_ADD_TC(tp, test_sigsys_on);
+ ATF_TP_ADD_TC(tp, test_sigsys_off);
+
+ return (atf_no_error());
+}
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