fortify-headers

standalone fortify-source implementation
git clone git://git.2f30.org/fortify-headers
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test_memcpy_overwrite_under.c (256B)

      1 #include "common.h"
      2 
      3 #include <string.h>
      4 
      5 int main(int argc, char** argv) {
      6   char buffer[9] = {'A', 'A', 'A', 'A', 'B', 'B', 'B', 'B', '\0'};
      7   puts(buffer);
      8 
      9   CHK_FAIL_START
     10   memcpy(buffer-1, buffer, 5);
     11   CHK_FAIL_END
     12 
     13   puts(buffer);
     14   return ret;
     15 }