[v2,0/9] Support strict kernel memory permissions for security

Message

Zong Li March 9, 2020, 8:22 a.m. UTC

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 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 |  41 ++++++
 arch/riscv/kernel/Makefile          |   4 +-
 arch/riscv/kernel/ftrace.c          |  13 +-
 arch/riscv/kernel/patch.c           | 124 ++++++++++++++++++
 arch/riscv/kernel/traps.c           |   3 +-
 arch/riscv/kernel/vmlinux.lds.S     |  11 +-
 arch/riscv/mm/Makefile              |   1 +
 arch/riscv/mm/init.c                |  45 +++++++
 arch/riscv/mm/pageattr.c            | 187 ++++++++++++++++++++++++++++
 13 files changed, 443 insertions(+), 14 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

Comments

Zong Li March 9, 2020, 8:33 a.m. UTC | #1

Zong Li <[e-mail]> 於 2020年3月9日 週一 下午4:22寫道：
>
> 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 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 |  41 ++++++
>  arch/riscv/kernel/Makefile          |   4 +-
>  arch/riscv/kernel/ftrace.c          |  13 +-
>  arch/riscv/kernel/patch.c           | 124 ++++++++++++++++++
>  arch/riscv/kernel/traps.c           |   3 +-
>  arch/riscv/kernel/vmlinux.lds.S     |  11 +-
>  arch/riscv/mm/Makefile              |   1 +
>  arch/riscv/mm/init.c                |  45 +++++++
>  arch/riscv/mm/pageattr.c            | 187 ++++++++++++++++++++++++++++
>  13 files changed, 443 insertions(+), 14 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
>
>

The page table dumper support might be considered together, it is
useful to check the page table entry permission. Thanks.
(Refer: https://lore.kernel.org/patchwork/patch/1191018/)