memcheck/tests/badjump2.c

   1 #include <assert.h>
   2 #include <setjmp.h>
   3 #include <signal.h>
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <string.h>
   7
   8 // Regression test for bug 91162:  if a client had a SEGV signal handler,
   9 // and jumped to a bogus address, Valgrind would abort.  With the fix,
  10 // the following test runs to completion correctly.
  11
  12 static jmp_buf myjmpbuf;
  13
  14 static
  15 void SIGSEGV_handler(int signum)
  16 {
  17    longjmp(myjmpbuf, 1);
  18 }
  19
  20 int main(void)
  21 {
  22    struct sigaction sigsegv_new, sigsegv_saved;
  23    int res;
  24
  25    /* Install own SIGSEGV handler */
  26    memset(&sigsegv_new, 0, sizeof(sigsegv_new));
  27    sigsegv_new.sa_handler  = SIGSEGV_handler;
  28    sigsegv_new.sa_flags    = 0;
  29 #if !defined(__APPLE__) && !defined(__sun) && !defined(__FreeBSD__)
  30    sigsegv_new.sa_restorer = NULL;
  31 #endif
  32    res = sigemptyset( &sigsegv_new.sa_mask );
  33    assert(res == 0);
  34
  35    res = sigaction( SIGSEGV, &sigsegv_new, &sigsegv_saved );
  36    assert(res == 0);
  37
  38    if (setjmp(myjmpbuf) == 0) {
  39       // Jump to zero; will cause seg fault
  40 #if defined(__powerpc64__) && (_CALL_ELF != 2)
  41       unsigned long int fn[3];
  42       fn[0] = 0;
  43       fn[1] = 0;
  44       fn[2] = 0;
  45 #else
  46       void (*fn)(void) = 0;
  47 #endif
  48       ((void(*)(void)) fn) ();
  49       fprintf(stderr, "Got here??\n");
  50    } else  {
  51       fprintf(stderr, "Signal caught, as expected\n");
  52    }
  53
  54    return 0;
  55 }
  56