[v3,0/2] get rid of writable linear aliases of read-only vmalloc mappings

Message

Ard Biesheuvel Nov. 6, 2018, 9:44 p.m. UTC

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

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.

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                  |  2 +-
 arch/arm64/mm/pageattr.c             | 36 +++++++++++++++++---
 4 files changed, 48 insertions(+), 6 deletions(-)