How did you inject the machine code into a running program on anything near a mo... | Hacker News

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		dajt on Nov 18, 2023 \| parent \| context \| favorite \| on: LMAX Disruptor – High Performance Inter-Thread Mes... How did you inject the machine code into a running program on anything near a modern architecture? Unless you had your own OS, wouldn't code segments be RO and data segments not executable? I don't know enough about any processor created in the last 30 years to know if running bare metal without a commercial OS would allow you to not have those constraints.

onetimeuse92304 on Nov 18, 2023 | [–]

If you can modify your operating system you can do pretty much anything you want (Thanks, Linus!)

silasb on Nov 19, 2023 | [–]

Can't you use `mprotect` to allow you to write to memory and execute?

https://github.com/Frodox/execute-machine-code-from-memory/t... has several examples of how to do it.

EDIT: https://www.kvakil.me/posts/2022-10-13-optimizing-mprotect-i... is another good link that explains this.

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