compiler-rt/test/hwasan/TestCases/custom-memmove.c

   1 // Test that custom memmove implementations instrumented by HWASan do not cause
   2 // false positives.
   3
   4 // RUN: %clang_hwasan %s -o %t
   5 // RUN: %run %t
   6
   7 #include <assert.h>
   8 #include <sanitizer/hwasan_interface.h>
   9 #include <stdlib.h>
  10
  11 void *memmove(void *Dest, const void *Src, size_t N) {
  12   char *Tmp = (char *)malloc(N);
  13   char *D = (char *)Dest;
  14   const char *S = (const char *)Src;
  15
  16   for (size_t I = 0; I < N; ++I)
  17     Tmp[I] = S[I];
  18   for (size_t I = 0; I < N; ++I)
  19     D[I] = Tmp[I];
  20
  21   free(Tmp);
  22   return Dest;
  23 }
  24
  25 int main() {
  26   __hwasan_enable_allocator_tagging();
  27
  28   const size_t BufSize = 64;
  29   char *Buf = (char *)malloc(BufSize);
  30
  31   for (size_t I = 0; I < BufSize; ++I)
  32     Buf[I] = I;
  33   memmove(Buf + BufSize / 2, Buf, BufSize / 2);
  34   for (size_t I = 0; I < BufSize; ++I)
  35     assert(Buf[I] == I % (BufSize / 2));
  36
  37   free(Buf);
  38   return 0;
  39 }