2 * Check decoding of threads when a non-leader thread invokes execve.
4 * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
5 * Copyright (c) 2016-2019 The strace developers.
8 * SPDX-License-Identifier: GPL-2.0-or-later
29 static unsigned int sigsetsize;
31 k_sigsuspend(const sigset_t *const set)
33 return syscall(__NR_rt_sigsuspend, set, sigsetsize);
39 return syscall(__NR_gettid);
45 static const struct sigaction sa = { .sa_handler = handler };
46 if (sigaction(SIGUSR1, &sa, NULL))
47 perror_msg_and_fail("sigaction");
51 sigaddset(&mask, SIGUSR1);
52 if (sigprocmask(SIG_BLOCK, &mask, NULL))
53 perror_msg_and_fail("sigprocmask");
58 for (sigsetsize = sizeof(mask) / sizeof(long);
59 sigsetsize; sigsetsize >>= 1) {
60 long rc = k_sigsuspend(&mask);
62 error_msg_and_fail("rt_sigsuspend");
65 printf("%-5d rt_sigsuspend(%p, %u) = %s\n",
66 leader, &mask, sigsetsize, sprintrc(rc));
69 perror_msg_and_fail("rt_sigsuspend");
70 printf("%-5d rt_sigsuspend([], %u) = ? ERESTARTNOHAND"
71 " (To be restarted if no handler)\n", leader, sigsetsize);
81 static const unsigned int NUMBER_OF_ITERATIONS = 1;
82 static unsigned int action;
90 for (p = args; *p; ++p)
101 static char buf[sizeof(action) * 3];
102 sprintf(buf, "%u", action + 1);
107 if (read(fds[0], fds, sizeof(fds[0])))
108 perror_msg_and_fail("execve");
110 struct timespec ts = { .tv_nsec = 100000000 };
111 (void) clock_nanosleep(CLOCK_REALTIME, 0, &ts, NULL);
114 printf("%-5d nanosleep({tv_sec=0, tv_nsec=%u}, NULL) = 0\n",
115 tid, (unsigned int) ts.tv_nsec);
117 switch (action % NUMBER_OF_ACTIONS) {
119 printf("%-5d execve(\"%s\", [\"%s\", \"%s\", \"%s\"]"
120 ", %p /* %u vars */ <pid changed to %u ...>\n",
121 tid, argv[0], argv[0], argv[1], argv[2],
122 environ, arglen(environ), leader);
124 case ACTION_rt_sigsuspend:
125 printf("%-5d execve(\"%s\", [\"%s\", \"%s\", \"%s\"]"
126 ", %p /* %u vars */ <unfinished ...>\n"
127 "%-5d <... rt_sigsuspend resumed>) = ?\n",
128 tid, argv[0], argv[0], argv[1], argv[2],
129 environ, arglen(environ),
132 case ACTION_nanosleep:
133 printf("%-5d execve(\"%s\", [\"%s\", \"%s\", \"%s\"]"
134 ", %p /* %u vars */ <unfinished ...>\n"
135 "%-5d <... nanosleep resumed> <unfinished ...>)"
137 tid, argv[0], argv[0], argv[1], argv[2],
138 environ, arglen(environ),
143 printf("%-5d +++ superseded by execve in pid %u +++\n"
144 "%-5d <... execve resumed>) = 0\n",
148 (void) nanosleep(&ts, NULL);
149 execve(argv[0], argv, environ);
150 perror_msg_and_fail("execve");
154 main(int ac, char **av)
156 setvbuf(stdout, NULL, _IONBF, 0);
160 struct timespec ts = { .tv_nsec = 1 };
161 if (clock_nanosleep(CLOCK_REALTIME, 0, &ts, NULL))
162 perror_msg_and_skip("clock_nanosleep CLOCK_REALTIME");
165 static char buf[sizeof(sigsetsize) * 3];
166 sprintf(buf, "%u", sigsetsize);
168 char *argv[] = { av[0], buf, (char *) "0", NULL };
169 printf("%-5d execve(\"%s\", [\"%s\", \"%s\", \"%s\"]"
170 ", %p /* %u vars */) = 0\n",
171 leader, argv[0], argv[0], argv[1], argv[2],
172 environ, arglen(environ));
173 execve(argv[0], argv, environ);
174 perror_msg_and_fail("execve");
177 sigsetsize = atoi(av[1]);
178 action = atoi(av[2]);
180 if (action >= NUMBER_OF_ACTIONS * NUMBER_OF_ITERATIONS) {
181 printf("%-5d +++ exited with 0 +++\n", leader);
186 perror_msg_and_fail("pipe");
189 errno = pthread_create(&t, NULL, thread, av);
191 perror_msg_and_fail("pthread_create");
193 struct timespec ts = { .tv_sec = 123 };
197 static char leader_str[sizeof(leader) * 3];
199 snprintf(leader_str, sizeof(leader_str), "%-5d", leader);
201 switch (action % NUMBER_OF_ACTIONS) {
203 printf("%s exit(42)%*s= ?\n", leader_str,
204 (int) sizeof(leader_str) - leader_str_len, " ");
206 (void) syscall(__NR_exit, 42);
208 case ACTION_rt_sigsuspend:
209 printf("%s rt_sigsuspend([], %u <unfinished ...>\n",
210 leader_str, sigsetsize);
212 (void) k_sigsuspend(&mask);
214 case ACTION_nanosleep:
215 printf("%s nanosleep({tv_sec=%u, tv_nsec=0}"
216 ", <unfinished ...>\n",
217 leader_str, (unsigned int) ts.tv_sec);
219 (void) nanosleep(&ts, 0);