\#include \#include \#include int foo(char *str) \{ char buffer[100]; /* The following statement has a buffer overflow problem */ strcpy(buffer, str); return 1; \} int main(int argc, char**argv) \{ char str[400]; FILE *badfile; badfile = fopen("badfile", "r"); fread(str, sizeof(char), 300, badfile); foo(str); return 1; \} In the above given sample code expalin how you would perform a bufferoverflow attack. Draw a detailed diagram of position of variables placed on the stack. Finally also explain how canary based protection mechanism can be used as defense