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Message-Id: <20181107103620.16054-1-ard.biesheuvel@linaro.org>
Date: Wed, 7 Nov 2018 11:36:18 +0100
From: Ard Biesheuvel <ard.biesheuvel@...aro.org>
To: linux-arm-kernel@...ts.infradead.org
Cc: kernel-hardening@...ts.openwall.com,
keescook@...omium.org,
labbott@...hat.com,
will.deacon@....com,
jannh@...gle.com,
mark.rutland@....com,
james.morse@....com,
catalin.marinas@....com,
Ard Biesheuvel <ard.biesheuvel@...aro.org>
Subject: [PATCH v4 0/2] get rid of writable linear aliases of read-only vmalloc mappings
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(-)
--
2.19.1
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