Messages in this thread | | | From | Youling Tang <> | Subject | [PATCH v4 0/5] LoongArch: Add kernel relocation and KASLR support | Date | Fri, 10 Feb 2023 16:47:31 +0800 |
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This patch series to support kernel relocation and KASLR (only 64bit).
Tested the kernel images built with new toolchain (Binutils-2.40 + patched GCC-12.2) and old toolchain (kernel.org cross toolchain [1]) on a 3A5000-7A2000-EVB.
With CONFIG_RANDOMIZE_BASE=y, the results are:
1. first boot, new toolchain:
$ sudo cat /proc/iomem | grep Kernel 01080000-0189ffff : Kernel code 018a0000-01deb5ff : Kernel data 01deb600-01ef6e9f : Kernel bss
2. second boot, new toolchain:
$ sudo cat /proc/iomem | grep Kernel 012f0000-01b0ffff : Kernel code 01b10000-0205b5ff : Kernel data 0205b600-02166e9f : Kernel bss
3. first boot, old toolchain: 010e0000-018fffff : Kernel code 01900000-01e591ff : Kernel data 01e59200-01f56dcf : Kernel bss
4. second boot, old toolchain: 010b0000-018cffff : Kernel code 018d0000-01e291ff : Kernel data 01e29200-01f26dcf : Kernel bss
Changes from v3:
- JUMP_LINK_ADDR renamed to JUMP_VIRT_ADDR, and use the way of parameter passing.
- Reimplement kernel relocation, when the link address and load address are different, realize the effect of adaptive relocation (one of the usage scenarios is kdump operation).
- Reimplement KASLR.
Changes from v2:
- Correctly fixup pcaddi12i/ori/lu32i.d/lu52i.d sequence generated by GNU as <= 2.39 for la.pcrel.
Changes from v1 to v2:
- Relocate the handlers instead of using a trampoline, to avoid performance issue on NUMA systems. - Fix compiler warnings.
Xi Ruoyao (2): LoongArch: Use la.pcrel instead of la.abs when it's trivially possible LoongArch: Use la.pcrel instead of la.abs for exception handlers
Youling Tang (3): LoongArch: Add JUMP_VIRT_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 | 38 +++++ arch/loongarch/Makefile | 5 + arch/loongarch/include/asm/inst.h | 1 + arch/loongarch/include/asm/setup.h | 6 +- arch/loongarch/include/asm/stackframe.h | 14 +- arch/loongarch/include/asm/uaccess.h | 1 - arch/loongarch/kernel/Makefile | 2 + arch/loongarch/kernel/entry.S | 2 +- arch/loongarch/kernel/genex.S | 40 ++++- arch/loongarch/kernel/head.S | 31 +++- arch/loongarch/kernel/relocate.c | 215 ++++++++++++++++++++++++ arch/loongarch/kernel/traps.c | 158 ++++++++++++++--- arch/loongarch/kernel/vmlinux.lds.S | 11 +- arch/loongarch/mm/tlb.c | 23 +-- arch/loongarch/mm/tlbex.S | 72 +++++++- arch/loongarch/power/suspend_asm.S | 5 +- 16 files changed, 560 insertions(+), 64 deletions(-) create mode 100644 arch/loongarch/kernel/relocate.c
-- 2.37.3
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