linux-kernel - Re: [PATCH v5 0/9] Support strict kernel memory permissions for security

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Message-ID: <CA+ZOyajXsNYZZwQgdV9Y2szN+=QbHu7GDA6Lc5iLk+92yx1WSw@mail.gmail.com>
Date:   Tue, 21 Apr 2020 13:36:14 +0800
From:   Zong Li <zongbox@...il.com>
To:     Palmer Dabbelt <palmer@...belt.com>
Cc:     Zong Li <zong.li@...ive.com>, Albert Ou <aou@...s.berkeley.edu>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        mhiramat@...nel.org, Paul Walmsley <paul.walmsley@...ive.com>,
        linux-riscv <linux-riscv@...ts.infradead.org>
Subject: Re: [PATCH v5 0/9] Support strict kernel memory permissions for security

Palmer Dabbelt <palmer@...belt.com> 於 2020年4月21日 週二 上午2:27寫道：
>
> On Wed, 08 Apr 2020 00:56:55 PDT (-0700), zong.li@...ive.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.
>

Sure, let me rebase it and send the next version. Thanks.

> Thanks!
>