Is Landlock, the Linux Security Module an off topic subject for the general discussion section?
Unless you’re asking about it in the context of Qubes OS, it would be off-topic indeed.
The topic of the all the categories in the forum is: Qubes OS.
The only exception is the All around qubes category.
How can I better frame the question to be in context with QubesOS? Sorry, my English is bad.
The only question you’ve asked so far is if it’s on-topic. I don’t know what your question is!
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I wanted to know if Linux kernel security features like Landlock are used by the dom0 kernel.
That’s on-topic for General Discussion!
I’ll put that in the title to make it clear. 
yay! I did it!
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So what about this kernel security feature?
