What is the protection of stack cookie ( i now that is the variable and all needed information about it), i don't get the point of using it like a protection, the variable changes if the buffer...

I get Segmentation fault (core dumped)


char shellcode[] = "\xbb\x00\x00\x00\x00"
"\xb8\x01\x00\x00\x00"
"\xcd\x80"; ...