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SubjectRe: [PATCH v3 0/9] Support strict kernel memory permissions for security
On Tue, Mar 31, 2020 at 9:32 PM Masami Hiramatsu <mhiramat@kernel.org> wrote:
>
> Hi Zong,
>
> On Tue, 10 Mar 2020 00:55:35 +0800
> Zong Li <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.
>
> The order of the patches seems a bit strange. Since the first 7 patches
> makes kernel read-only, at that point ftrace is broken and it is fixed
> by the last 2 patches. That is not bisect-friendly. Can you move the
> last 2 patches to the top?
>

OK. Let me rearrange the order. Thanks.

> Thank you,
>
> >
> > 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 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
> > riscv: add macro to get instruction length
> > riscv: introduce interfaces to patch kernel code
> > riscv: patch code by fixmap mapping
> >
> > 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 | 13 +-
> > 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, 445 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
> >
> > --
> > 2.25.1
> >
>
>
> --
> Masami Hiramatsu <mhiramat@kernel.org>

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