$ cat writeup.md…
$ cat writeup.md…
rev_kids20
Task: x86-64 ELF that takes no input, deterministically builds and prints a flag while stalling with sleep() and guarding with ptrace(PTRACE_TRACEME). Solution: stub out sleep()/ptrace() with an LD_PRELOAD shim and just run it (or fully emulate the XOR/signed-char-modulo pipeline in Python) to recover the printed flag.
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