On Mon, Jul 24, 2023 at 4:32 PM Conor Dooley <conor.dooley@xxxxxxxxxxxxx> wrote: > > 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> Great, thanks for testing! > > I'll hopefully get some time later in the week to go through the code. I will be on holiday in 3 weeks, you have some time, no worries :) Thanks again, Alex > > Cheers, > Conor. >
