Messages in this thread | | | Subject | Re: [PATCH v6 0/3] Introduce 64b relocatable kernel | From | Alex Ghiti <> | Date | Thu, 17 Jun 2021 15:33:48 +0200 |
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Le 18/05/2021 à 12:12, Alexandre Ghiti a écrit : > After multiple attempts, this patchset is now based on the fact that the > 64b kernel mapping was moved outside the linear mapping. > > The first patch allows to build relocatable kernels but is not selected > by default. That patch should ease KASLR implementation a lot. > The second and third patches take advantage of an already existing powerpc > script that checks relocations at compile-time, and uses it for riscv.
@Palmer, any thought about that? There are no users for now, do you want to wait for a KASLR implementation to use it before merging this? If so, I can work on a KASLR implementation based on older implementation from Zong.
Thanks,
> > This patchset was tested on: > > * kernel: > - rv32: OK > - rv64 with RELOCATABLE: OK and checked that "suspicious" relocations are caught. > - rv64 without RELOCATABLE: OK > - powerpc: build only and checked that "suspicious" relocations are caught. > > * xipkernel: > - rv32: build only > - rv64: OK > > * nommukernel: > - rv64: build only > > Changes in v6: > * Remove the kernel move to vmalloc zone > * Rebased on top of for-next > * Remove relocatable property from 32b kernel as the kernel is mapped in > the linear mapping and would then need to be copied physically too > * CONFIG_RELOCATABLE depends on !XIP_KERNEL > * Remove Reviewed-by from first patch as it changed a bit > > Changes in v5: > * Add "static __init" to create_kernel_page_table function as reported by > Kbuild test robot > * Add reviewed-by from Zong > * Rebase onto v5.7 > > Changes in v4: > * Fix BPF region that overlapped with kernel's as suggested by Zong > * Fix end of module region that could be larger than 2GB as suggested by Zong > * Fix the size of the vm area reserved for the kernel as we could lose > PMD_SIZE if the size was already aligned on PMD_SIZE > * Split compile time relocations check patch into 2 patches as suggested by Anup > * Applied Reviewed-by from Zong and Anup > > Changes in v3: > * Move kernel mapping to vmalloc > > Changes in v2: > * Make RELOCATABLE depend on MMU as suggested by Anup > * Rename kernel_load_addr into kernel_virt_addr as suggested by Anup > * Use __pa_symbol instead of __pa, as suggested by Zong > * Rebased on top of v5.6-rc3 > * Tested with sv48 patchset > * Add Reviewed/Tested-by from Zong and Anup > > Alexandre Ghiti (3): > riscv: Introduce CONFIG_RELOCATABLE > powerpc: Move script to check relocations at compile time in scripts/ > riscv: Check relocations at compile time > > arch/powerpc/tools/relocs_check.sh | 18 ++-------- > arch/riscv/Kconfig | 12 +++++++ > arch/riscv/Makefile | 5 ++- > arch/riscv/Makefile.postlink | 36 ++++++++++++++++++++ > arch/riscv/kernel/vmlinux.lds.S | 6 ++++ > arch/riscv/mm/Makefile | 4 +++ > arch/riscv/mm/init.c | 53 +++++++++++++++++++++++++++++- > arch/riscv/tools/relocs_check.sh | 26 +++++++++++++++ > scripts/relocs_check.sh | 20 +++++++++++ > 9 files changed, 162 insertions(+), 18 deletions(-) > create mode 100644 arch/riscv/Makefile.postlink > create mode 100755 arch/riscv/tools/relocs_check.sh > create mode 100755 scripts/relocs_check.sh >
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