$ cat writeup.md…
$ cat writeup.md…
ringzer0ctf
Task: a loadable Linux kernel module (.ko) that is said to compute a flag at load time. Solution: statically reverse init_module (not stripped, debug_info present) to recover the atoi'd seed, the sprintf format strings, and a 33-byte .rodata XOR key, then reimplement the loop offline. No exploitation needed.
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