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Warning

⚠️ This module is a joke. It is completely insecure, and it is the very definition of a bad idea. Do not use this on a system you care about. I highly recommend testing it in a VM, then throwing the entire VM image away.

capcom.ko

A Windows driver capcom.sys has been making the news in the last few days, and I thought it would be a fun exercise to do the equivalent on Linux.

Requirements

It appears that this works with Linux 4.0 or later, but I don't make any guarantees. It would be simple to support other versions, but I consider it to be a security feature if this fails to build on a given platform.

Using

$ make -C /lib/modules/$(uname -r)/build M=$PWD

After inserting the module, you can run ./exploit as an unprivileged user to see a message printed in dmesg, demonstrating that kernel security is completely undermined.

Disclaimer

I do not play Street Fighter V, nor have I even seen a copy of capcom.sys. This was designed solely based on a tweet and a Reddit comment describing its behavior.

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