linux-kernel - Re: [PATCH 0/4] LoongArch: Add kernel relocation and KASLR support

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Date:   Fri, 13 Jan 2023 14:44:25 +0800
From:   Huacai Chen <chenhuacai@...nel.org>
To:     Youling Tang <tangyouling@...ngson.cn>
Cc:     Xi Ruoyao <xry111@...111.site>, Jinyang He <hejinyang@...ngson.cn>,
        Xuerui Wang <kernel@...0n.name>, loongarch@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [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@...ngson.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
>