debug/tst-longjmp_chk.c

   1 /* Basic test to make sure doing a longjmp to a jmpbuf with an invalid sp
   2    is caught by the fortification code.  */
   3 #include <errno.h>
   4 #include <fcntl.h>
   5 #include <paths.h>
   6 #include <setjmp.h>
   7 #include <signal.h>
   8 #include <stdbool.h>
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <unistd.h>
  12
  13 #include <support/support.h>
  14
  15 static jmp_buf b;
  16
  17
  18 static void
  19 __attribute__ ((noinline))
  20 f (void)
  21 {
  22   char buf[1000];
  23   asm volatile ("" : "=m" (buf));
  24
  25   if (setjmp (b) != 0)
  26     {
  27       puts ("second longjmp succeeded");
  28       exit (1);
  29     }
  30 }
  31
  32
  33 static bool expected_to_fail;
  34
  35
  36 static void
  37 handler (int sig)
  38 {
  39   if (expected_to_fail)
  40     _exit (0);
  41   else
  42     {
  43       static const char msg[] = "unexpected longjmp failure\n";
  44       TEMP_FAILURE_RETRY (write (STDOUT_FILENO, msg, sizeof (msg) - 1));
  45       _exit (1);
  46     }
  47 }
  48
  49
  50 static int
  51 do_test (void)
  52 {
  53   set_fortify_handler (handler);
  54
  55
  56   expected_to_fail = false;
  57
  58   if (setjmp (b) == 0)
  59     {
  60       longjmp (b, 1);
  61       /* NOTREACHED */
  62       printf ("first longjmp returned\n");
  63       return 1;
  64     }
  65
  66
  67   expected_to_fail = true;
  68
  69   f ();
  70   longjmp (b, 1);
  71
  72   puts ("second longjmp returned");
  73   return 1;
  74 }
  75
  76 #include <support/test-driver.c>