用來保護棧不被毀壞。

<code c>
void function(char *str) {
   char buffer[16];

   strcpy(buffer,str);
}

void main() {
  char large_string[256];
  int i;

  for( i = 0; i < 255; i++)
    large_string[i] = 'A';

  function(large_string);
}
</code>
<code bash>
$ gcc -fstack-protector test.c
$ ./a.out
*** stack smashing detected ***:  terminated
</code>
====== 相關資料 ======
  * [[http://insecure.org/stf/smashstack.html|Smashing The Stack For Fun And Profit]]
====== 外部連結 ======
  * [[http://wiki.osdev.org/GCC_Stack_Smashing_Protector|GCC Stack Smashing Protector]]
  * [[wp>Stack buffer overflow]]
  * [[wp>Buffer overflow protection]]
  * [[http://llvm.org/docs/doxygen/html/StackProtector_8cpp_source.html|StackProtector.cpp]]