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

[Zong Li]

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

-- 
2.25.0