blob: 4f12701a9633f34cb6e5c68fadb7e2ac1ebd49c7 [file] [log] [blame]
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <dlfcn.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/wait.h>
#include <sys/sendfile.h>
int main(void)
{
const unsigned long pagesize = sysconf(_SC_PAGESIZE);
#ifdef __s390__
/*
* The si_addr field is unreliable:
* https://marc.info/?l=linux-s390&m=142515870124248&w=2
*/
return 77;
#endif
/* write instruction pointer length to the log */
if (write(-1, NULL, 2 * sizeof(void *)) >= 0)
return 77;
/* just a noticeable line in the log */
if (munmap(&main, 0) >= 0)
return 77;
int pid = fork();
if (pid < 0)
return 77;
if (!pid) {
const unsigned long mask = ~(pagesize - 1);
unsigned long addr = (unsigned long) &main & mask;
unsigned long size = pagesize << 1;
#ifdef HAVE_DLADDR
Dl_info info;
if (dladdr(&main, &info)) {
const unsigned long base =
(unsigned long) info.dli_fbase & mask;
if (base < addr) {
size += addr - base;
addr = base;
}
} else
#endif
{
addr -= size;
size <<= 1;
}
/* SIGSEGV is expected */
(void) munmap((void *) addr, size);
(void) munmap((void *) addr, size);
return 77;
}
int status;
if (wait(&status) != pid ||
!WIFSIGNALED(status) ||
WTERMSIG(status) != SIGSEGV)
return 77;
/* dump process map for debug purposes */
close(0);
if (!open("/proc/self/maps", O_RDONLY))
(void) sendfile(1, 0, NULL, pagesize);
return 0;
}