tests/nxheap.c

   1 #include <stdlib.h>
   2 #include <unistd.h>
   3 #include <signal.h>
   4 #include <setjmp.h>
   5
   6 #include <darwintest.h>
   7
   8 static char *heap;
   9 static volatile int pass;
  10 static sigjmp_buf jbuf;
  11
  12 static void __dead2
  13 action(int signo, struct __siginfo *info, void *uap __attribute__((unused)))
  14 {
  15         if (info) {
  16                 pass = (signo == SIGBUS && info->si_addr == heap);
  17         }
  18         siglongjmp(jbuf, 0);
  19 }
  20
  21 T_DECL(nxheap, "Non-executable heap", T_META_CHECK_LEAKS(NO))
  22 {
  23         struct sigaction sa = {
  24                 .__sigaction_u.__sa_sigaction = action,
  25                 .sa_flags = SA_SIGINFO,
  26         };
  27
  28         T_ASSERT_POSIX_ZERO(sigaction(SIGBUS, &sa, NULL), NULL);
  29
  30         if (sigsetjmp(jbuf, 0)) {
  31                 T_PASS("SIGBUS");
  32                 T_END;
  33         }
  34
  35         T_QUIET; T_ASSERT_NOTNULL((heap = malloc(1)), NULL);
  36
  37         *heap = (char)0xc3; // retq
  38         ((void (*)(void))heap)(); // call *%eax
  39
  40         T_FAIL("SIGBUS");
  41 }