1. intro 2. code 및 분석 2.1. code #include #include // Instructions // // gcc -o chall chall.c -Wl,-z,norelro -fno-stack-protector (on the app-systeme-ch61 server for instance, but the goal is to enable NX and PIE) void Winner() { printf("Access granted!\n"); FILE *fp; int c; fp = fopen(".passwd", "r"); if (fp == NULL) { perror("Error while opening the file.\n"); exit(EXIT_FAILURE); } else { print..

1. intro 2. code 및 분석 2.1. code #include #include #include #include #include void shell(void); int main() { char buffer[64]; int check; int i = 0; int count = 0; printf("Enter your name: "); fflush(stdout); while(1) { if(count >= 64) printf("Oh no...Sorry !\n"); if(check == 0xbffffabc) shell(); else { read(fileno(stdin),&i,1); switch(i) { case '\n': printf("\a"); break; case 0x08: count--; print..