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Date:   Sun, 19 Feb 2017 19:03:38 +0900
From:   Hoeun Ryu <>
Cc:     Hoeun Ryu <>
Subject: [PATCH 0/7] introduce __ro_mostly_after_init section marker

 After `__ro_after_init` marker is included in kernel, many kernel data
objects can be read-only-after-init. But there are many other places that
would be good to read-only-after-init but `__ro_after_init` can not be simply
applicable to them because they should be writable at some points, which are
during module_init/exit or dynamic de/registration for a specific subsystem.
 `__ro_mostly_after_init` is basically the same to `__ro_after_init`. The
section is mapped as read-only after kernel init. The different thing is
this section is temporarily mapped as read-write during module_init/exit and
de/registration of a subsystem using set_ro_mostly_after_init_rw/ro pair.

- Tested only on arm64.

  0001 patch is `__ro_mostly_after_init` itself.
  0002 patch is to add set_ro_mostly_after_init_rw/ro pair using
  0003 patch is to make the section read-write in module_init/exit.
  0004 patch is an example for dynamic init/deinit of a subsystem.
  0005 patch is an example for __ro_mostly_after_init section modified during
  0006/0007 patches are fixes for arm64 kernel mapping.

Hoeun Ryu (7):
  arch: add __ro_mostly_after_init section marker
  init: add set_ro_mostly_after_init_rw/ro function
  module: modify memory attrs for __ro_mostly_after_init during
  selinux: mark __ro_mostly_after_init for selinux_hooks/selinux_nf_ops
  cpu: mark ro_mostly_after_init for cpuhp_ap/bp_states
  arm64: add __map_kernel_segment to accept additional vm flags
  arm64: map seperately rodata sections for __ro_mostly_after_init

 arch/arm64/mm/mmu.c               | 44 ++++++++++++++++++++++++++++++++-------
 include/asm-generic/sections.h    |  1 +
 include/asm-generic/ | 10 +++++++++
 include/linux/cache.h             | 11 ++++++++++
 include/linux/init.h              |  6 ++++++
 init/main.c                       | 24 +++++++++++++++++++++
 kernel/cpu.c                      |  4 ++--
 kernel/module.c                   | 10 +++++++--
 security/selinux/hooks.c          |  8 +++++--
 9 files changed, 105 insertions(+), 13 deletions(-)


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