[0/8] Support strict kernel memory permissions for security

Message

Zong Li Feb. 17, 2020, 8:32 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.

Zong Li (8):
  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 DEBUG_WX support
  riscv: add two hook functions of ftrace

 arch/riscv/Kconfig                  |   6 +
 arch/riscv/Kconfig.debug            |  30 +++++
 arch/riscv/include/asm/ptdump.h     |   6 +
 arch/riscv/include/asm/set_memory.h |  41 ++++++
 arch/riscv/kernel/ftrace.c          |  18 +++
 arch/riscv/kernel/vmlinux.lds.S     |  12 +-
 arch/riscv/mm/Makefile              |   1 +
 arch/riscv/mm/init.c                |  47 +++++++
 arch/riscv/mm/pageattr.c            | 187 ++++++++++++++++++++++++++++
 9 files changed, 344 insertions(+), 4 deletions(-)
 create mode 100644 arch/riscv/include/asm/set_memory.h
 create mode 100644 arch/riscv/mm/pageattr.c

Comments

Palmer Dabbelt March 5, 2020, 3:55 p.m. UTC | #1

On Mon, 17 Feb 2020 00:32:15 PST (-0800), [e-mail] 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.
>
> Zong Li (8):
>   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 DEBUG_WX support
>   riscv: add two hook functions of ftrace
>
>  arch/riscv/Kconfig                  |   6 +
>  arch/riscv/Kconfig.debug            |  30 +++++
>  arch/riscv/include/asm/ptdump.h     |   6 +
>  arch/riscv/include/asm/set_memory.h |  41 ++++++
>  arch/riscv/kernel/ftrace.c          |  18 +++
>  arch/riscv/kernel/vmlinux.lds.S     |  12 +-
>  arch/riscv/mm/Makefile              |   1 +
>  arch/riscv/mm/init.c                |  47 +++++++
>  arch/riscv/mm/pageattr.c            | 187 ++++++++++++++++++++++++++++
>  9 files changed, 344 insertions(+), 4 deletions(-)
>  create mode 100644 arch/riscv/include/asm/set_memory.h
>  create mode 100644 arch/riscv/mm/pageattr.c

Sorry, I had to run last night without quite finishing the patch set.  Just so
we're on the same page: there's some issues with the patch set, I'm assuming
you're submitting a v2 so I'm dropping this from my inbox.

Thanks!