Author:
Teknikclel69

Language:
Assembler

Upload:
3:50 PM 01/23/2024

Platform
Unix/linux etc.

Difficulty:
1.4

Quality:
4.8

Arch:
x86

Description

second day of using assembly. i made it silly cause i felt like it

• Comments
• Solutions

bitemiraatif on 6:30 AM 02/07/2024: im a newbie and cracked it, but i have two questions? if int 0x80 is executed at that time eax is 3 how is it taking input from me if system call code is 3 and Q2 is when did we load "chinese baguette" in the first place?

cnathansmith on 5:51 AM 02/08/2024: syscall 3 in x86 on Linux is sys_read. Take a look at the register arguments here: https://faculty.nps.edu/cseagle/assembly/sys_call.html "chinese baguette\n" is just hardcoded into the data section and labeled 'lmao': 0804A018 lmao db 'chinese baguette',0Ah,0 The input is read into 'string', then this is compared to 'lmao' byte-by-byte: .text:0804901B lea esi, string .text:08049021 lea edi, lmao ; "chinese baguette\n" .text:08049027 mov ecx, 11h .text:0804902C repe cmpsb .text:0804902E jnz short error

pico on 5:36 PM 02/11/2024: Easy, the positions 3,4,5 and 6 of the lmao string are changed so the letters on those positions end up being cken, so the word changes from chinese to chicken. So the correct answer is chicken baguette.

AfkMaster on 7:40 PM 02/11/2024: nice!

stewa2m3 on 11:15 PM 04/01/2024: I was thrown off originally by the "chinese baguette". Found in through the strings command. Was able to use gdb to breakpoint at trole() and just print the string from memory.

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