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SubjectRe: [PATCH v3 0/6] implement KASLR for powerpc/fsl_booke/64
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Hi everyone, any comments or suggestions?

Thanks,
Jason

on 2020/2/6 10:58, Jason Yan wrote:
> This is a try to implement KASLR for Freescale BookE64 which is based on
> my earlier implementation for Freescale BookE32:
> https://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=131718
>
> The implementation for Freescale BookE64 is similar as BookE32. One
> difference is that Freescale BookE64 set up a TLB mapping of 1G during
> booting. Another difference is that ppc64 needs the kernel to be
> 64K-aligned. So we can randomize the kernel in this 1G mapping and make
> it 64K-aligned. This can save some code to creat another TLB map at
> early boot. The disadvantage is that we only have about 1G/64K = 16384
> slots to put the kernel in.
>
> KERNELBASE
>
> 64K |--> kernel <--|
> | | |
> +--+--+--+ +--+--+--+--+--+--+--+--+--+ +--+--+
> | | | |....| | | | | | | | | |....| | |
> +--+--+--+ +--+--+--+--+--+--+--+--+--+ +--+--+
> | | 1G
> |-----> offset <-----|
>
> kernstart_virt_addr
>
> I'm not sure if the slot numbers is enough or the design has any
> defects. If you have some better ideas, I would be happy to hear that.
>
> Thank you all.
>
> v2->v3:
> Fix build error when KASLR is disabled.
> v1->v2:
> Add __kaslr_offset for the secondary cpu boot up.
>
> Jason Yan (6):
> powerpc/fsl_booke/kaslr: refactor kaslr_legal_offset() and
> kaslr_early_init()
> powerpc/fsl_booke/64: introduce reloc_kernel_entry() helper
> powerpc/fsl_booke/64: implement KASLR for fsl_booke64
> powerpc/fsl_booke/64: do not clear the BSS for the second pass
> powerpc/fsl_booke/64: clear the original kernel if randomized
> powerpc/fsl_booke/kaslr: rename kaslr-booke32.rst to kaslr-booke.rst
> and add 64bit part
>
> .../{kaslr-booke32.rst => kaslr-booke.rst} | 35 +++++++--
> arch/powerpc/Kconfig | 2 +-
> arch/powerpc/kernel/exceptions-64e.S | 23 ++++++
> arch/powerpc/kernel/head_64.S | 14 ++++
> arch/powerpc/kernel/setup_64.c | 4 +-
> arch/powerpc/mm/mmu_decl.h | 19 ++---
> arch/powerpc/mm/nohash/kaslr_booke.c | 71 +++++++++++++------
> 7 files changed, 132 insertions(+), 36 deletions(-)
> rename Documentation/powerpc/{kaslr-booke32.rst => kaslr-booke.rst} (59%)
>

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