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#!/bin/sh
# sigaltstack(2) regression test by Steven Hartland <killing@multiplay.co.uk>
# Wrong altsigstack clearing on exec
# https://github.com/golang/go/issues/15658#issuecomment-287276856
# Fixed by r315453
cd /tmp
cat > test-sigs.c <<EOF
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <pthread.h>
extern char **environ;
static void
die(const char *s)
{
perror(s);
exit(EXIT_FAILURE);
}
static void
setstack(void *arg __unused)
{
stack_t ss;
ss.ss_sp = malloc(SIGSTKSZ);
if (ss.ss_sp == NULL)
die("malloc");
ss.ss_size = SIGSTKSZ;
ss.ss_flags = 0;
if (sigaltstack(&ss, NULL) < 0)
die("sigaltstack set");
}
static void *
thread_exec(void *arg)
{
struct timespec ts = {0, 1000};
char *argv[] = {"./test-sigs", "no-more", 0};
setstack(arg);
nanosleep(&ts, NULL);
execve(argv[0], &argv[0], environ);
die("exec failed");
return NULL;
}
static void *
thread_sleep(void *arg __unused)
{
sleep(10);
return NULL;
}
int
main(int argc, char** argv __unused)
{
int j;
pthread_t tid1, tid2;
if (argc != 1) {
stack_t ss;
if (sigaltstack(NULL, &ss) < 0)
die("sigaltstack get");
if (ss.ss_sp != NULL || ss.ss_flags != SS_DISABLE ||
ss.ss_size != 0) {
fprintf(stderr, "invalid signal stack after execve: "
"ss_sp=%p ss_size=%lu ss_flags=0x%x\n", ss.ss_sp,
(unsigned long)ss.ss_size,
(unsigned int)ss.ss_flags);
return 1;
}
printf("valid signal stack is valid after execve\n");
return 0;
}
// We have to use two threads to ensure that can detect the
// issue when new threads are added to the head (pre 269095)
// and the tail of the process thread list.
j = pthread_create(&tid1, NULL, thread_exec, NULL);
if (j != 0) {
errno = j;
die("pthread_create");
}
j = pthread_create(&tid2, NULL, thread_sleep, NULL);
if (j != 0) {
errno = j;
die("pthread_create");
}
j = pthread_join(tid1, NULL);
if (j != 0) {
errno = j;
die("pthread_join");
}
j = pthread_join(tid2, NULL);
if (j != 0) {
errno = j;
}
return 0;
}
EOF
cc -o test-sigs -Wall -Wextra -O2 -g test-sigs.c -lpthread || exit 1
./test-sigs
s=$?
rm -f test-sigs test-sigs.c
exit $s
|
