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Date: Mon, 25 Jun 2018 19:39:19 +0800
From: Jun Yao <yaojun8558363@...il.com>
To: linux-arm-kernel@...ts.infradead.org
Cc: catalin.marinas@....com,
will.deacon@....com,
ard.biesheuvel@...aro.org,
james.morse@....com,
linux-kernel@...r.kernel.org,
kernel-hardening@...ts.openwall.com
Subject: [PATCH v2 0/2] Move {tramp_pg_dir,swapper_pg_dir} to .rodata
Version 2 changes:
As James Morse suggested[1], we introduce init_pg_dir, which
is a reserved area of __initdata section. We setup initial
page tables in it and then we setup final page tables in
swapper_pg_dir directly. In this way, we can avoid using
temporary top level.
To defend 'KSMA', we need to handle page table configurations
which we can write a block-mapping into swapper_pg_dir. These
configurations are:
CONFIG_ARM64_VA_BITS_39(4KB granule, 1GB block)
CONFIG_ARM64_VA_BITS_36(16KB granule, 32MB block)
CONFIG_ARM64_VA_BITS_42(64KB granule, 512MB block)
If these configurations are selected, we move {tramp_pg_dir,
swapper_pg_dir} to .rodata section. And we update
swapper_pg_dir by fixmap.
[1] https://patchwork.kernel.org/patch/10476597/
Jun Yao (2):
arm64/mm: Introduce init_pg_dir
arm64/mm: Move {tramp_pg_dir, swapper_pg_dir} to .rodata section
arch/arm64/include/asm/fixmap.h | 2 +-
arch/arm64/include/asm/pgalloc.h | 33 ++++++++++++++++++++
arch/arm64/include/asm/pgtable.h | 8 +++--
arch/arm64/kernel/head.S | 52 ++++++++++++++++++++++---------
arch/arm64/kernel/vmlinux.lds.S | 26 +++++++++++++++-
arch/arm64/mm/mmu.c | 36 +++++++--------------
include/asm-generic/vmlinux.lds.h | 5 +++
mm/init-mm.c | 2 +-
8 files changed, 119 insertions(+), 45 deletions(-)
--
2.17.1
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