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

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Date:   Mon,  9 Jan 2023 17:07:50 +0800
From:   Youling Tang <tangyouling@...ngson.cn>
To:     Huacai Chen <chenhuacai@...nel.org>,
        Xi Ruoyao <xry111@...111.site>,
        Jinyang He <hejinyang@...ngson.cn>
Cc:     Xuerui Wang <kernel@...0n.name>, loongarch@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: [PATCH 0/4] LoongArch: Add kernel relocation and KASLR support

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