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/*
* Check decoding of threads when a non-leader thread invokes execve.
*
* Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
* Copyright (c) 2016-2018 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include <asm/unistd.h>
#include <errno.h>
#include <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
static pid_t leader;
static pid_t tid;
static void
handler(int signo)
{
}
static unsigned int sigsetsize;
static long
k_sigsuspend(const sigset_t *const set)
{
return syscall(__NR_rt_sigsuspend, set, sigsetsize);
}
static pid_t
k_gettid(void)
{
return syscall(__NR_gettid);
}
static void
get_sigsetsize(void)
{
static const struct sigaction sa = { .sa_handler = handler };
if (sigaction(SIGUSR1, &sa, NULL))
perror_msg_and_fail("sigaction");
sigset_t mask;
sigemptyset(&mask);
sigaddset(&mask, SIGUSR1);
if (sigprocmask(SIG_BLOCK, &mask, NULL))
perror_msg_and_fail("sigprocmask");
raise(SIGUSR1);
sigemptyset(&mask);
for (sigsetsize = sizeof(mask) / sizeof(long);
sigsetsize; sigsetsize >>= 1) {
long rc = k_sigsuspend(&mask);
if (!rc)
error_msg_and_fail("rt_sigsuspend");
if (EINTR == errno)
break;
printf("%-5d rt_sigsuspend(%p, %u) = %s\n",
leader, &mask, sigsetsize, sprintrc(rc));
}
if (!sigsetsize)
perror_msg_and_fail("rt_sigsuspend");
printf("%-5d rt_sigsuspend([], %u) = ? ERESTARTNOHAND"
" (To be restarted if no handler)\n", leader, sigsetsize);
}
enum {
ACTION_exit = 0,
ACTION_rt_sigsuspend,
ACTION_nanosleep,
NUMBER_OF_ACTIONS
};
static const unsigned int NUMBER_OF_ITERATIONS = 1;
static unsigned int action;
static int fds[2];
static unsigned int
arglen(char **args)
{
char **p;
for (p = args; *p; ++p)
;
return p - args;
}
static void *
thread(void *arg)
{
tid = k_gettid();
static char buf[sizeof(action) * 3];
sprintf(buf, "%u", action + 1);
char **argv = arg;
argv[2] = buf;
if (read(fds[0], fds, sizeof(fds[0])))
perror_msg_and_fail("execve");
struct timespec ts = { .tv_nsec = 100000000 };
(void) clock_nanosleep(CLOCK_REALTIME, 0, &ts, NULL);
ts.tv_nsec = 12345;
printf("%-5d nanosleep({tv_sec=0, tv_nsec=%u}, NULL) = 0\n",
tid, (unsigned int) ts.tv_nsec);
switch (action % NUMBER_OF_ACTIONS) {
case ACTION_exit:
printf("%-5d execve(\"%s\", [\"%s\", \"%s\", \"%s\"]"
", %p /* %u vars */ <pid changed to %u ...>\n",
tid, argv[0], argv[0], argv[1], argv[2],
environ, arglen(environ), leader);
break;
case ACTION_rt_sigsuspend:
printf("%-5d execve(\"%s\", [\"%s\", \"%s\", \"%s\"]"
", %p /* %u vars */ <unfinished ...>\n"
"%-5d <... rt_sigsuspend resumed>) = ?\n",
tid, argv[0], argv[0], argv[1], argv[2],
environ, arglen(environ),
leader);
break;
case ACTION_nanosleep:
printf("%-5d execve(\"%s\", [\"%s\", \"%s\", \"%s\"]"
", %p /* %u vars */ <unfinished ...>\n"
"%-5d <... nanosleep resumed> <unfinished ...>)"
" = ?\n",
tid, argv[0], argv[0], argv[1], argv[2],
environ, arglen(environ),
leader);
break;
}
printf("%-5d +++ superseded by execve in pid %u +++\n"
"%-5d <... execve resumed> ) = 0\n",
leader, tid,
leader);
(void) nanosleep(&ts, NULL);
execve(argv[0], argv, environ);
perror_msg_and_fail("execve");
}
int
main(int ac, char **av)
{
setvbuf(stdout, NULL, _IONBF, 0);
leader = getpid();
if (ac < 3) {
struct timespec ts = { .tv_nsec = 1 };
if (clock_nanosleep(CLOCK_REALTIME, 0, &ts, NULL))
perror_msg_and_skip("clock_nanosleep CLOCK_REALTIME");
get_sigsetsize();
static char buf[sizeof(sigsetsize) * 3];
sprintf(buf, "%u", sigsetsize);
char *argv[] = { av[0], buf, (char *) "0", NULL };
printf("%-5d execve(\"%s\", [\"%s\", \"%s\", \"%s\"]"
", %p /* %u vars */) = 0\n",
leader, argv[0], argv[0], argv[1], argv[2],
environ, arglen(environ));
execve(argv[0], argv, environ);
perror_msg_and_fail("execve");
}
sigsetsize = atoi(av[1]);
action = atoi(av[2]);
if (action >= NUMBER_OF_ACTIONS * NUMBER_OF_ITERATIONS) {
printf("%-5d +++ exited with 0 +++\n", leader);
return 0;
}
if (pipe(fds))
perror_msg_and_fail("pipe");
pthread_t t;
errno = pthread_create(&t, NULL, thread, av);
if (errno)
perror_msg_and_fail("pthread_create");
struct timespec ts = { .tv_sec = 123 };
sigset_t mask;
sigemptyset(&mask);
static char leader_str[sizeof(leader) * 3];
int leader_str_len =
snprintf(leader_str, sizeof(leader_str), "%-5d", leader);
switch (action % NUMBER_OF_ACTIONS) {
case ACTION_exit:
printf("%s exit(42)%*s= ?\n", leader_str,
(int) sizeof(leader_str) - leader_str_len, " ");
close(fds[1]);
(void) syscall(__NR_exit, 42);
break;
case ACTION_rt_sigsuspend:
printf("%s rt_sigsuspend([], %u <unfinished ...>\n",
leader_str, sigsetsize);
close(fds[1]);
(void) k_sigsuspend(&mask);
break;
case ACTION_nanosleep:
printf("%s nanosleep({tv_sec=%u, tv_nsec=0}"
", <unfinished ...>\n",
leader_str, (unsigned int) ts.tv_sec);
close(fds[1]);
(void) nanosleep(&ts, 0);
break;
}
return 1;
}
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