Re: [PATCH v6 0/5] riscv: Introduce KASLR

[Conor Dooley]

Hey Alex,

On Sat, Jul 22, 2023 at 02:38:45PM +0200, Alexandre Ghiti wrote:
> The following KASLR implementation allows to randomize the kernel mapping:
> 
> - virtually: we expect the bootloader to provide a seed in the device-tree
> - physically: only implemented in the EFI stub, it relies on the firmware to
>   provide a seed using EFI_RNG_PROTOCOL. arm64 has a similar implementation
>   hence the patch 3 factorizes KASLR related functions for riscv to take
>   advantage.
> 
> The new virtual kernel location is limited by the early page table that only
> has one PUD and with the PMD alignment constraint, the kernel can only take
> < 512 positions.

I gave this all a go today, it seems to do what it it says on the tin,
and crashing my kernel does dump out an offset etc.

Tested-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>

I'll hopefully get some time later in the week to go through the code.

Cheers,
Conor.

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