Messages in this thread | | | From | Zong Li <> | Subject | [PATCH v4 0/9] Support strict kernel memory permissions for security | Date | Tue, 7 Apr 2020 22:46:45 +0800 |
| |
The main purpose of this patch series is changing the kernel mapping permission , make sure that code is not writeable, data is not executable, and read-only data is neither writable nor executable.
This patch series also supports the relevant implementations such as ARCH_HAS_SET_MEMORY, ARCH_HAS_SET_DIRECT_MAP, ARCH_SUPPORTS_DEBUG_PAGEALLOC and DEBUG_WX.
Changes in v4: - Use NOKPROBE_SYMBOL instead of __kprobe annotation - Use text_mutex instead of patch_lock - Remove 'riscv_' prefix of function name
Changes in v3: - Fix build error on nommu configuration. We already support nommu on RISC-V, so we should consider nommu case and test not only rv32/64, but also nommu.
Changes in v2: - Use _data to specify the start of data section with write permission. - Change ftrace patch text implementaion. - Separate DEBUG_WX patch to another patchset.
Zong Li (9): riscv: add macro to get instruction length riscv: introduce interfaces to patch kernel code riscv: patch code by fixmap mapping riscv: add ARCH_HAS_SET_MEMORY support riscv: add ARCH_HAS_SET_DIRECT_MAP support riscv: add ARCH_SUPPORTS_DEBUG_PAGEALLOC support riscv: move exception table immediately after RO_DATA riscv: add alignment for text, rodata and data sections riscv: add STRICT_KERNEL_RWX support
arch/riscv/Kconfig | 6 + arch/riscv/include/asm/bug.h | 8 ++ arch/riscv/include/asm/fixmap.h | 2 + arch/riscv/include/asm/patch.h | 12 ++ arch/riscv/include/asm/set_memory.h | 48 +++++++ arch/riscv/kernel/Makefile | 4 +- arch/riscv/kernel/ftrace.c | 26 ++-- arch/riscv/kernel/patch.c | 120 ++++++++++++++++++ arch/riscv/kernel/traps.c | 3 +- arch/riscv/kernel/vmlinux.lds.S | 11 +- arch/riscv/mm/Makefile | 2 +- arch/riscv/mm/init.c | 44 +++++++ arch/riscv/mm/pageattr.c | 187 ++++++++++++++++++++++++++++ 13 files changed, 458 insertions(+), 15 deletions(-) create mode 100644 arch/riscv/include/asm/patch.h create mode 100644 arch/riscv/include/asm/set_memory.h create mode 100644 arch/riscv/kernel/patch.c create mode 100644 arch/riscv/mm/pageattr.c
-- 2.26.0
| |