Re: Fedora 37: Add kernel parameters that help prevent local exploits

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* Hellosway Here via devel:

> Add `slab_nomerge init_on_alloc=1 init_on_free=1 page_alloc.shuffle=1
> pti=on randomize_kstack_offset=on vsyscall=none ` as default kernel
> command line arguments. This can help prevent local exploits by making
> it harder to exploit the kernel. I do not think there will be any
> breakage, I have been using these for a long time. The performance
> impact is minimal, a few of these can improve performance.
>
> This can help increase the security of Fedora, while also not causing
> any other problems.

vsyscall=none is an x86-64 userspace ABI break.  It may stop some
userspace exploit techniques, but it does nothing to prevent kernel
exploits.

I have a proposal to disable vsyscall without impacting userspace ABI.

Thanks,
Florian
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