fortify-headers

standalone fortify-source implementation
git clone git://git.2f30.org/fortify-headers
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test_strncpy_overwrite_over.c (426B)

      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   strncpy(buffer, buffer+4, 1);
     10   puts(buffer);
     11 
     12   strncpy(buffer+6, buffer, 1);
     13   puts(buffer);
     14 
     15   char buffer2[9] = {'A', 'A', 'A', 'A', 'B', 'B', 'B', 'B', '\0'};
     16   CHK_FAIL_START
     17   strncpy(buffer2+1, buffer2, 5);
     18   CHK_FAIL_END
     19 
     20   puts(buffer2);
     21   return ret;
     22 }