find-pltgot.c

#define _GNU_SOURCE
#include <link.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>

int main(int argc, char *argv[])
{
  struct link_map *m;
  ElfW(Dyn) *dynsec;

  ElfW(Addr) pltgot = 0;

  for(m = _r_debug.r_map; m != NULL; m = m->l_next) {
    printf("name = %s, l_addr = %p\n", m->l_name, m->l_addr);

    for(dynsec = m->l_ld; dynsec->d_tag != DT_NULL; dynsec++) {
      if (dynsec->d_tag == DT_PLTGOT) {
          pltgot = dynsec->d_un.d_ptr;
          break;
      }
    }

    printf("pltgot = %p\n", pltgot);

    /*
    for(ds = m->l_ld; ds->d_tag != DT_NULL; ds++) {
      printf("d_tag = %d\tptr = %p\tval = %u\n", ds->d_tag, ds->d_un.d_ptr, ds->d_un.d_val);
    }
    */

  }

  sleep(100);
  return 0;
}