2 * Copyright (c) 2023 The FreeBSD Foundation
4 * SPDX-License-Identifier: BSD-2-Clause
6 * This software were developed by Konstantin Belousov <kib@FreeBSD.org>
7 * under sponsorship from the FreeBSD Foundation.
10 #include <sys/param.h>
11 #include <sys/syscall.h>
12 #include <sys/sysctl.h>
17 #include <stdatomic.h>
21 static sig_atomic_t sigsys_cnt;
23 #define SAVEDVALUE "savedsignosys"
26 sigsys_handler(int signo, siginfo_t *si, void *ucp)
36 memset(&sa, 0, sizeof(sa));
37 sa.sa_sigaction = sigsys_handler;
38 sa.sa_flags = SA_SIGINFO;
39 ATF_REQUIRE(sigaction(SIGSYS, &sa, NULL) == 0);
41 ATF_REQUIRE(syscall(273) == -1); /* reserved */
42 ATF_CHECK_ERRNO(ENOSYS, true);
43 atomic_signal_fence(memory_order_seq_cst);
44 ATF_CHECK_EQ(1 * knob, sigsys_cnt * knob);
46 ATF_REQUIRE(syscall(440) == -1); /* SYS_kse_switchin */
47 ATF_CHECK_ERRNO(ENOSYS, true);
48 atomic_signal_fence(memory_order_seq_cst);
49 ATF_CHECK_EQ(2 * knob, sigsys_cnt * knob);
51 /* Hope this is enough for say next two months */
52 ATF_REQUIRE(syscall(3000000) == -1);
53 ATF_CHECK_ERRNO(ENOSYS, true);
54 atomic_signal_fence(memory_order_seq_cst);
55 ATF_CHECK_EQ(3 * knob, sigsys_cnt * knob);
57 ATF_REQUIRE(syscall(SYS_afs3_syscall) == -1);
58 ATF_CHECK_ERRNO(ENOSYS, true);
59 atomic_signal_fence(memory_order_seq_cst);
60 ATF_CHECK_EQ(4 * knob, sigsys_cnt * knob);
64 sysctlset(const char *name, int val)
66 size_t oldlen = sizeof(int);
70 ATF_REQUIRE(sysctlbyname(name, &oldval, &oldlen, NULL, 0) == 0);
72 /* Store old %name in a symlink for cleanup */
73 snprintf(buf, sizeof(buf), "%d", oldval);
74 ATF_REQUIRE(symlink(buf, SAVEDVALUE) == 0);
76 ATF_REQUIRE(sysctlbyname(name, NULL, NULL, &val, sizeof(val)) == 0);
80 sysctlcleanup(const char *name)
86 if ((n = readlink(SAVEDVALUE, buf, sizeof(buf))) > 0) {
87 buf[MIN((size_t)n, sizeof(buf) - 1)] = '\0';
88 if (sscanf(buf, "%d", &oldval) == 1) {
89 oldlen = sizeof(oldval);
90 (void)sysctlbyname(name, NULL, 0,
94 (void)unlink(SAVEDVALUE);
97 ATF_TC_WITH_CLEANUP(sigsys_test_on);
98 ATF_TC_HEAD(sigsys_test_on, tc)
100 atf_tc_set_md_var(tc, "require.user", "root");
101 atf_tc_set_md_var(tc, "require.config", "allow_sysctl_side_effects");
102 atf_tc_set_md_var(tc, "descr",
103 "Testing delivery of SIGSYS on invalid syscalls");
106 ATF_TC_BODY(sigsys_test_on, tc)
108 sysctlset("kern.signosys", 1);
112 ATF_TC_CLEANUP(sigsys_test_on, tc)
114 sysctlcleanup("kern.signosys");
117 ATF_TC_WITH_CLEANUP(sigsys_test_off);
118 ATF_TC_HEAD(sigsys_test_off, tc)
120 atf_tc_set_md_var(tc, "require.user", "root");
121 atf_tc_set_md_var(tc, "require.config", "allow_sysctl_side_effects");
122 atf_tc_set_md_var(tc, "descr",
123 "Testing SIGSYS silence on invalid syscalls");
126 ATF_TC_BODY(sigsys_test_off, tc)
128 sysctlset("kern.signosys", 0);
132 ATF_TC_CLEANUP(sigsys_test_off, tc)
134 sysctlcleanup("kern.signosys");
139 ATF_TP_ADD_TC(tp, sigsys_test_on);
140 ATF_TP_ADD_TC(tp, sigsys_test_off);
141 return (atf_no_error());