[v4,0/2] get rid of writable linear aliases of read-only vmalloc mappings

Message

Ard Biesheuvel Nov. 7, 2018, 10:36 a.m. UTC

This is a followup to my patch 'arm64/mm: unmap the linear alias of module
allocations'. (v1-v2)

This version changes the approach to match what x86 does, i.e., to deal
with the linear alias at a more fundamental level, in the set_memory_ro/rw
routines.

Changes since v3:
- drop boolean function parameter and infer whether to remap the alias from
  set_mask/clear_mask
- overload rodata= instead of adding yet another kernel cmdline arg
- fix typos

Ard Biesheuvel (2):
  arm64: mm: purge lazily unmapped vm regions before changing
    permissions
  arm64: mm: apply r/o permissions of VM areas to its linear alias as
    well

 arch/arm64/Kconfig                   | 14 +++++++++++++
 arch/arm64/include/asm/mmu_context.h |  2 ++
 arch/arm64/mm/mmu.c                  | 16 +++++++++++++--
 arch/arm64/mm/pageattr.c             | 21 ++++++++++++++++++++
 4 files changed, 51 insertions(+), 2 deletions(-)