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SubjectRe: [PATCH v5 0/9] Support strict kernel memory permissions for security
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On Wed, 08 Apr 2020 00:56:55 PDT (-0700), zong.li@sifive.com wrote:
> 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 v5:
> - Add lockdep_assert_held and more comments for text_mutex.
>
> 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 | 128 +++++++++++++++++++
> 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, 466 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

Looks like there are quite a few conflicts here. Do you mind re-spinning the
patch set for me? It's a bit early to spin off for-next right now so there
might be some more conflicts, but hopefully not too many.

Thanks!

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