compiler-rt/test/hwasan/TestCases/longjmp.c

   1 // RUN: %clang_hwasan -O0 -DNEGATIVE %s -o %t && %run %t 2>&1
   2 // RUN: %clang_hwasan -O0 %s -o %t && not %run %t 2>&1 | FileCheck %s
   3
   4 // REQUIRES: pointer-tagging
   5
   6 #include <stdlib.h>
   7 #include <assert.h>
   8 #include <sanitizer/hwasan_interface.h>
   9
  10 __attribute__((noinline))
  11 int f(void *caller_frame) {
  12   int z = 0;
  13   int *volatile p = &z;
  14   // Tag of local is never zero.
  15   assert(__hwasan_tag_pointer(p, 0) != p);
  16 #ifndef NEGATIVE
  17   // This will destroy shadow of "z", and the following load will crash.
  18   __hwasan_handle_longjmp(caller_frame);
  19 #endif
  20   return p[0];
  21 }
  22
  23 int main() {
  24   return f(__builtin_frame_address(0));
  25   // CHECK: READ of size 8 at {{.*}} tags: {{.*}}/00 (ptr/mem)
  26 }