compiler-rt/test/hwasan/TestCases/hwasan-print-shadow.cpp

   1 // RUN: %clangxx_hwasan -DSIZE=16 -O0 %s -o %t && %run %t 2>&1 | FileCheck %s
   2
   3 // REQUIRES: stable-runtime
   4
   5 #include <assert.h>
   6 #include <stdlib.h>
   7 #include <sys/mman.h>
   8 #include <sanitizer/hwasan_interface.h>
   9
  10 int main() {
  11   char *alloc = (char *)malloc(4096);
  12
  13   // Simulate short granule tags.
  14   alloc[15] = 0x00;
  15   alloc[31] = 0xbb;
  16   alloc[47] = 0xcc;
  17   alloc[63] = 0xdd;
  18   alloc[79] = 0xee;
  19   alloc[95] = 0xff;
  20
  21   // __hwasan_tag_memory expects untagged pointers.
  22   char *p = (char *)__hwasan_tag_pointer(alloc, 0);
  23   assert(p);
  24
  25   // Write tags to shadow.
  26   __hwasan_tag_memory(p, 1, 32);
  27   __hwasan_tag_memory(p + 32, 16, 16);
  28   __hwasan_tag_memory(p + 48, 0, 32);
  29   __hwasan_tag_memory(p + 80, 4, 16);
  30
  31   char *q = (char *)__hwasan_tag_pointer(p, 7);
  32   __hwasan_print_shadow(q + 5, 89 - 5);
  33   // CHECK:      HWASan shadow map for {{.*}}5 .. {{.*}}9 (pointer tag 7)
  34   // CHECK-NEXT:   {{.*}}0: 01(00)
  35   // CHECK-NEXT:   {{.*}}0: 01(bb)
  36   // CHECK-NEXT:   {{.*}}0: 10
  37   // CHECK-NEXT:   {{.*}}0: 00
  38   // CHECK-NEXT:   {{.*}}0: 00
  39   // CHECK-NEXT:   {{.*}}0: 04(ff)
  40
  41   free(alloc);
  42 }