Messages in this thread | | | Subject | Re: [PATCH v3 0/6] implement KASLR for powerpc/fsl_booke/64 | From | Jason Yan <> | Date | Thu, 20 Feb 2020 11:33:12 +0800 |
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ping...
on 2020/2/13 11:00, Jason Yan wrote: > 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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