t_ptrace_sigchld.c revision 1.3
1 /* $NetBSD: t_ptrace_sigchld.c,v 1.3 2020/05/05 18:12:20 kamil Exp $ */ 2 3 /*- 4 * Copyright (c) 2020 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __RCSID("$NetBSD: t_ptrace_sigchld.c,v 1.3 2020/05/05 18:12:20 kamil Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/types.h> 34 #include <sys/exec_elf.h> 35 #include <sys/mman.h> 36 #include <sys/ptrace.h> 37 #include <sys/resource.h> 38 #include <sys/stat.h> 39 #include <sys/syscall.h> 40 #include <sys/sysctl.h> 41 #include <sys/uio.h> 42 #include <sys/wait.h> 43 #include <machine/reg.h> 44 #include <assert.h> 45 #include <elf.h> 46 #include <err.h> 47 #include <errno.h> 48 #include <fcntl.h> 49 #include <lwp.h> 50 #include <pthread.h> 51 #include <sched.h> 52 #include <signal.h> 53 #include <spawn.h> 54 #include <stdint.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <strings.h> 58 #include <time.h> 59 #include <unistd.h> 60 61 #include <atf-c.h> 62 63 #include "h_macros.h" 64 #include "msg.h" 65 66 #include "t_ptrace_wait.h" 67 68 #define SYSCALL_REQUIRE(expr) ATF_REQUIRE_MSG(expr, "%s: %s", # expr, \ 69 strerror(errno)) 70 #define SYSCALL_REQUIRE_ERRNO(res, exp) ATF_REQUIRE_MSG(res == exp, \ 71 "%d(%s) != %d", res, strerror(res), exp) 72 73 static int debug = 0; 74 75 #define DPRINTF(a, ...) do \ 76 if (debug) \ 77 printf("%s() %d.%d %s:%d " a, \ 78 __func__, getpid(), _lwp_self(), __FILE__, __LINE__, ##__VA_ARGS__); \ 79 while (/*CONSTCOND*/0) 80 81 /// ---------------------------------------------------------------------------- 82 83 static int expected_signo; 84 static int expected_code; 85 static int expected_status; 86 static pid_t expected_pid; 87 88 static void 89 sigchld_action(int sig, siginfo_t *info, void *ctx) 90 { 91 92 FORKEE_ASSERT_EQ(info->si_signo, expected_signo); 93 FORKEE_ASSERT_EQ(info->si_code, expected_code); 94 FORKEE_ASSERT_EQ(info->si_uid, getuid()); 95 FORKEE_ASSERT_EQ(info->si_pid, expected_pid); 96 97 if (WIFEXITED(info->si_status)) 98 ATF_REQUIRE_EQ(WEXITSTATUS(info->si_status), expected_status); 99 else if (WIFSTOPPED(info->si_status)) 100 ATF_REQUIRE_EQ(WSTOPSIG(info->si_status), expected_status); 101 else if (WIFSIGNALED(info->si_status)) 102 ATF_REQUIRE_EQ(WTERMSIG(info->si_status), expected_status); 103 /* 104 else if (WIFCONTINUED(info->si_status)) 105 ; 106 */ 107 } 108 109 static void 110 traceme_raise(int sigval) 111 { 112 const int exitval = 5; 113 struct sigaction sa; 114 pid_t child; 115 struct msg_fds parent_child; 116 uint8_t msg = 0xde; /* dummy message for IPC based on pipe(2) */ 117 118 struct ptrace_siginfo info; 119 memset(&info, 0, sizeof(info)); 120 121 memset(&sa, 0, sizeof(sa)); 122 sa.sa_sigaction = sigchld_action; 123 sa.sa_flags = SA_SIGINFO | SA_NOCLDWAIT; 124 sigemptyset(&sa.sa_mask); 125 126 atf_tc_skip("XXX: zombie is not collected before tracer's death"); 127 128 SYSCALL_REQUIRE(sigaction(SIGCHLD, &sa, NULL) == 0); 129 130 SYSCALL_REQUIRE(msg_open(&parent_child) == 0); 131 132 DPRINTF("Before forking process PID=%d\n", getpid()); 133 SYSCALL_REQUIRE((child = fork()) != -1); 134 if (child == 0) { 135 DPRINTF("Before calling PT_TRACE_ME from child %d\n", getpid()); 136 FORKEE_ASSERT(ptrace(PT_TRACE_ME, 0, NULL, 0) != -1); 137 138 CHILD_FROM_PARENT("raise1 child", parent_child, msg); 139 140 raise(sigval); 141 142 CHILD_TO_PARENT("raise2 child", parent_child, msg); 143 144 switch (sigval) { 145 case SIGKILL: 146 /* NOTREACHED */ 147 FORKEE_ASSERTX(0 && "This shall not be reached"); 148 __unreachable(); 149 default: 150 DPRINTF("Before exiting of the child process\n"); 151 _exit(exitval); 152 } 153 } 154 DPRINTF("Parent process PID=%d, child's PID=%d\n", getpid(), child); 155 156 expected_signo = SIGCHLD; 157 expected_pid = child; 158 switch (sigval) { 159 case SIGKILL: 160 expected_code = CLD_KILLED; 161 expected_status = SIGKILL; 162 break; 163 case SIGSTOP: 164 expected_code = CLD_STOPPED; 165 expected_status = SIGSTOP; 166 break; 167 default: 168 break; 169 } 170 171 PARENT_TO_CHILD("raise1 child", parent_child, msg); 172 173 switch (sigval) { 174 case SIGKILL: 175 break; 176 default: 177 PARENT_FROM_CHILD("raise2 child", parent_child, msg); 178 179 DPRINTF("Before calling ptrace(2) with PT_GET_SIGINFO for " 180 "child\n"); 181 SYSCALL_REQUIRE(ptrace(PT_GET_SIGINFO, child, &info, 182 sizeof(info)) != -1); 183 184 DPRINTF("Signal traced to lwpid=%d\n", info.psi_lwpid); 185 DPRINTF("Signal properties: si_signo=%#x si_code=%#x " 186 "si_errno=%#x\n", 187 info.psi_siginfo.si_signo, info.psi_siginfo.si_code, 188 info.psi_siginfo.si_errno); 189 190 ATF_REQUIRE_EQ(info.psi_siginfo.si_signo, sigval); 191 ATF_REQUIRE_EQ(info.psi_siginfo.si_code, SI_LWP); 192 193 expected_code = CLD_EXITED; 194 expected_status = exitval; 195 196 SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0)); 197 198 break; 199 } 200 201 await_collected(child); /* XXX: Process is never collected */ 202 } 203 204 #define TRACEME_RAISE(test, sig) \ 205 ATF_TC(test); \ 206 ATF_TC_HEAD(test, tc) \ 207 { \ 208 atf_tc_set_md_var(tc, "descr", \ 209 "Verify " #sig " followed by _exit(2) in a child"); \ 210 atf_tc_set_md_var(tc, "timeout", "10"); \ 211 } \ 212 \ 213 ATF_TC_BODY(test, tc) \ 214 { \ 215 \ 216 traceme_raise(sig); \ 217 } 218 219 TRACEME_RAISE(traceme_raise1, SIGKILL) /* non-maskable */ 220 #if notyet 221 TRACEME_RAISE(traceme_raise2, SIGSTOP) /* non-maskable */ 222 TRACEME_RAISE(traceme_raise3, SIGABRT) /* regular abort trap */ 223 TRACEME_RAISE(traceme_raise4, SIGHUP) /* hangup */ 224 TRACEME_RAISE(traceme_raise5, SIGCONT) /* continued? */ 225 TRACEME_RAISE(traceme_raise6, SIGTRAP) /* crash signal */ 226 TRACEME_RAISE(traceme_raise7, SIGBUS) /* crash signal */ 227 TRACEME_RAISE(traceme_raise8, SIGILL) /* crash signal */ 228 TRACEME_RAISE(traceme_raise9, SIGFPE) /* crash signal */ 229 TRACEME_RAISE(traceme_raise10, SIGSEGV) /* crash signal */ 230 #endif 231 232 ATF_TP_ADD_TCS(tp) 233 { 234 setvbuf(stdout, NULL, _IONBF, 0); 235 setvbuf(stderr, NULL, _IONBF, 0); 236 237 ATF_TP_ADD_TC(tp, traceme_raise1); 238 #if notyet 239 ATF_TP_ADD_TC(tp, traceme_raise2); 240 ATF_TP_ADD_TC(tp, traceme_raise3); 241 ATF_TP_ADD_TC(tp, traceme_raise4); 242 ATF_TP_ADD_TC(tp, traceme_raise5); 243 ATF_TP_ADD_TC(tp, traceme_raise6); 244 ATF_TP_ADD_TC(tp, traceme_raise7); 245 ATF_TP_ADD_TC(tp, traceme_raise8); 246 ATF_TP_ADD_TC(tp, traceme_raise9); 247 ATF_TP_ADD_TC(tp, traceme_raise10); 248 #endif 249 250 return atf_no_error(); 251 } 252
Indexes created Tue Sep 30 20:09:53 GMT 2025