kconcat

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Flag format: CTF{...}

As we are running our mitigated kernel (https://github.com/thejh/linux/blob/b97cbfe06757d908412e6afa217b1fe77dc48282/MITIGATION_README), we could safely implement a super fast text concatenation functionality directly in the kernel. Get root code exec and run cat /flag. (Note: the flag file is 3780 bytes long.)

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