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SubjectRe: [PATCH 0/4] LoongArch: Add kernel relocation and KASLR support
Hi, Ruoyao and Jinyang,

Could you please take some time to review this patchset?

Huacai

On Mon, Jan 9, 2023 at 5:08 PM Youling Tang <tangyouling@loongson.cn> wrote:
>
> This patch series to support kernel relocation and KASLR (only 64bit).
>
> Both old[1] and new[2] toolchains support this feature, and the test results
> are as follows:
> 1) Enable CONFING_RELOCATABLE
> # cat /proc/iomem
> 00000000-0fffffff : System RAM
> 00000000-002c3fff : Reserved
> 002c4000-008c3fff : Reserved
> 02000000-02f4ffff : Kernel code
> 02f50000-0381cbff : Kernel data
> 0381cc00-0394ae37 : Kernel bss
>
> 2) Enable CONFING_RANDOMIZE_BASE (KASLR)
> first:
> # cat /proc/iomem
> 00000000-0fffffff : System RAM
> 00000000-002c3fff : Reserved
> 002c4000-008c3fff : Reserved
> 02550000-0349ffff : Kernel code
> 034a0000-03d6cbff : Kernel data
> 03d6cc00-03e9ae37 : Kernel bss
>
> second:
> # cat /proc/iomem
> 00000000-0fffffff : System RAM
> 00000000-002c3fff : Reserved
> 002c4000-008c3fff : Reserved
> 02ad0000-03a1ffff : Kernel code
> 03a20000-042ecbff : Kernel data
> 042ecc00-0441ae37 : Kernel bss
>
> Thanks to @Ruoyao's and @Jinyang's for their help and suggestions.
>
> Links:
> [1]: https://github.com/sunhaiyong1978/CLFS-for-LoongArch/releases/download/5.0/loongarch64-clfs-5.1-cross-tools-c-only.tar.xz
> [2]: https://github.com/sunhaiyong1978/CLFS-for-LoongArch/releases/download/6.0/loongarch64-clfs-6.3-cross-tools-c-only.tar.xz
>
> Xi Ruoyao (1):
> LoongArch: Use trampoline for exception handlers and kill la.abs
>
> Youling Tang (3):
> LoongArch: Add JUMP_LINK_ADDR macro implementation to avoid using
> la.abs
> LoongArch: Add support for kernel relocation
> LoongArch: Add support for kernel address space layout randomization
> (KASLR)
>
> arch/loongarch/Kconfig | 37 +++++
> arch/loongarch/Makefile | 5 +
> arch/loongarch/include/asm/page.h | 6 +
> arch/loongarch/include/asm/stackframe.h | 16 +-
> arch/loongarch/include/asm/uaccess.h | 1 -
> arch/loongarch/kernel/Makefile | 2 +
> arch/loongarch/kernel/entry.S | 6 +-
> arch/loongarch/kernel/genex.S | 20 +--
> arch/loongarch/kernel/head.S | 30 +++-
> arch/loongarch/kernel/relocate.c | 210 ++++++++++++++++++++++++
> arch/loongarch/kernel/setup.c | 3 +
> arch/loongarch/kernel/traps.c | 4 +-
> arch/loongarch/kernel/vmlinux.lds.S | 11 +-
> arch/loongarch/mm/tlbex.S | 28 +---
> arch/loongarch/power/suspend_asm.S | 5 +-
> 15 files changed, 333 insertions(+), 51 deletions(-)
> create mode 100644 arch/loongarch/kernel/relocate.c
>
> --
> 2.37.1
>

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