/*
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* Check decoding of threads when a non-leader thread invokes execve.
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*
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* Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
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* Copyright (c) 2016-2017 The strace developers.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "tests.h"
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#include <asm/unistd.h>
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#include <errno.h>
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#include <pthread.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <unistd.h>
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static pid_t leader;
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static pid_t tid;
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static void
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handler(int signo)
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{
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}
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static unsigned int sigsetsize;
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static long
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k_sigsuspend(const sigset_t *const set)
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{
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return syscall(__NR_rt_sigsuspend, set, sigsetsize);
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}
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static pid_t
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k_gettid(void)
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{
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return syscall(__NR_gettid);
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}
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static void
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get_sigsetsize(void)
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{
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static const struct sigaction sa = { .sa_handler = handler };
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if (sigaction(SIGUSR1, &sa, NULL))
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perror_msg_and_fail("sigaction");
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sigset_t mask;
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sigemptyset(&mask);
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sigaddset(&mask, SIGUSR1);
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if (sigprocmask(SIG_BLOCK, &mask, NULL))
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perror_msg_and_fail("sigprocmask");
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raise(SIGUSR1);
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sigemptyset(&mask);
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for (sigsetsize = sizeof(mask) / sizeof(long);
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sigsetsize; sigsetsize >>= 1) {
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long rc = k_sigsuspend(&mask);
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if (!rc)
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error_msg_and_fail("rt_sigsuspend");
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if (EINTR == errno)
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break;
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printf("%-5d rt_sigsuspend(%p, %u) = %s\n",
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leader, &mask, sigsetsize, sprintrc(rc));
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}
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if (!sigsetsize)
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perror_msg_and_fail("rt_sigsuspend");
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printf("%-5d rt_sigsuspend([], %u) = ? ERESTARTNOHAND"
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" (To be restarted if no handler)\n", leader, sigsetsize);
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}
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enum {
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ACTION_exit = 0,
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ACTION_rt_sigsuspend,
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ACTION_nanosleep,
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NUMBER_OF_ACTIONS
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};
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static const unsigned int NUMBER_OF_ITERATIONS = 1;
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static unsigned int action;
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static int fds[2];
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static unsigned int
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arglen(char **args)
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{
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char **p;
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for (p = args; *p; ++p)
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;
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return p - args;
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}
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static void *
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thread(void *arg)
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{
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tid = k_gettid();
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static char buf[sizeof(action) * 3];
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sprintf(buf, "%u", action + 1);
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char **argv = arg;
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argv[2] = buf;
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if (read(fds[0], fds, sizeof(fds[0])))
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perror_msg_and_fail("execve");
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struct timespec ts = { .tv_nsec = 100000000 };
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(void) clock_nanosleep(CLOCK_REALTIME, 0, &ts, NULL);
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ts.tv_nsec = 12345;
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printf("%-5d nanosleep({tv_sec=0, tv_nsec=%u}, NULL) = 0\n",
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tid, (unsigned int) ts.tv_nsec);
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switch (action % NUMBER_OF_ACTIONS) {
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case ACTION_exit:
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printf("%-5d execve(\"%s\", [\"%s\", \"%s\", \"%s\"]"
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", %p /* %u vars */ <pid changed to %u ...>\n",
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tid, argv[0], argv[0], argv[1], argv[2],
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environ, arglen(environ), leader);
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break;
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case ACTION_rt_sigsuspend:
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printf("%-5d execve(\"%s\", [\"%s\", \"%s\", \"%s\"]"
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", %p /* %u vars */ <unfinished ...>\n"
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"%-5d <... rt_sigsuspend resumed>) = ?\n",
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tid, argv[0], argv[0], argv[1], argv[2],
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environ, arglen(environ),
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leader);
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break;
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case ACTION_nanosleep:
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printf("%-5d execve(\"%s\", [\"%s\", \"%s\", \"%s\"]"
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", %p /* %u vars */ <unfinished ...>\n"
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"%-5d <... nanosleep resumed> <unfinished ...>)"
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" = ?\n",
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tid, argv[0], argv[0], argv[1], argv[2],
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environ, arglen(environ),
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leader);
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break;
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}
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printf("%-5d +++ superseded by execve in pid %u +++\n"
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"%-5d <... execve resumed> ) = 0\n",
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leader, tid,
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leader);
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(void) nanosleep(&ts, NULL);
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execve(argv[0], argv, environ);
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perror_msg_and_fail("execve");
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}
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int
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main(int ac, char **av)
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{
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setvbuf(stdout, NULL, _IONBF, 0);
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leader = getpid();
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if (ac < 3) {
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struct timespec ts = { .tv_nsec = 1 };
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if (clock_nanosleep(CLOCK_REALTIME, 0, &ts, NULL))
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perror_msg_and_skip("clock_nanosleep CLOCK_REALTIME");
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get_sigsetsize();
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static char buf[sizeof(sigsetsize) * 3];
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sprintf(buf, "%u", sigsetsize);
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char *argv[] = { av[0], buf, (char *) "0", NULL };
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printf("%-5d execve(\"%s\", [\"%s\", \"%s\", \"%s\"]"
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", %p /* %u vars */) = 0\n",
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leader, argv[0], argv[0], argv[1], argv[2],
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environ, arglen(environ));
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execve(argv[0], argv, environ);
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perror_msg_and_fail("execve");
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}
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sigsetsize = atoi(av[1]);
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action = atoi(av[2]);
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if (action >= NUMBER_OF_ACTIONS * NUMBER_OF_ITERATIONS) {
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printf("%-5d +++ exited with 0 +++\n", leader);
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return 0;
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}
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if (pipe(fds))
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perror_msg_and_fail("pipe");
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pthread_t t;
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errno = pthread_create(&t, NULL, thread, av);
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if (errno)
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perror_msg_and_fail("pthread_create");
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struct timespec ts = { .tv_sec = 123 };
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sigset_t mask;
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sigemptyset(&mask);
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static char leader_str[sizeof(leader) * 3];
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int leader_str_len =
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snprintf(leader_str, sizeof(leader_str), "%-5d", leader);
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switch (action % NUMBER_OF_ACTIONS) {
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case ACTION_exit:
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printf("%s exit(42)%*s= ?\n", leader_str,
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(int) sizeof(leader_str) - leader_str_len, " ");
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close(fds[1]);
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(void) syscall(__NR_exit, 42);
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break;
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case ACTION_rt_sigsuspend:
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printf("%s rt_sigsuspend([], %u <unfinished ...>\n",
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leader_str, sigsetsize);
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close(fds[1]);
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(void) k_sigsuspend(&mask);
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break;
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case ACTION_nanosleep:
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printf("%s nanosleep({tv_sec=%u, tv_nsec=0}"
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", <unfinished ...>\n",
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leader_str, (unsigned int) ts.tv_sec);
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close(fds[1]);
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(void) nanosleep(&ts, 0);
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break;
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}
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return 1;
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}
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