From: ard.biesheuvel@linaro.org (Ard Biesheuvel)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC PATCH 0/6] replace static mapping for pgdir region
Date: Mon, 19 Mar 2018 19:19:52 +0800 [thread overview]
Message-ID: <20180319111958.4171-1-ard.biesheuvel@linaro.org> (raw)
On systems that are affected by S&M variant 3a, KPTI is not sufficient to
hide the physical placement of the kernel, since the trampoline page is
statically allocated, and the contents of TTBR1_EL1 is visible to attackers.
So instead, use a separate physical allocation and map it at the same
virtual offset as swapper_pg_dir and the trampoline were mapped before.
Ard Biesheuvel (6):
arm64/mm: add explicit physical address argument to map_kernel_segment
arm64/mm: create dedicated segment for pgdir mappings
arm64/mm: use physical address as cpu_replace_ttbr1() argument
arm64/mm: stop using __pa_symbol() for swapper_pg_dir
arm64/mm: factor out clear_page() for unmapped memory
arm64/mm: use independent physical allocation for pgdir segment
arch/arm64/include/asm/mmu_context.h | 4 +-
arch/arm64/include/asm/pgtable.h | 2 +
arch/arm64/include/asm/sections.h | 1 +
arch/arm64/kernel/cpufeature.c | 2 +-
arch/arm64/kernel/hibernate.c | 2 +-
arch/arm64/kernel/vmlinux.lds.S | 3 +
arch/arm64/mm/kasan_init.c | 4 +-
arch/arm64/mm/mmu.c | 84 ++++++++++----------
8 files changed, 55 insertions(+), 47 deletions(-)
--
2.11.0
next reply other threads:[~2018-03-19 11:19 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-19 11:19 Ard Biesheuvel [this message]
2018-03-19 11:19 ` [RFC PATCH 1/6] arm64/mm: add explicit physical address argument to map_kernel_segment Ard Biesheuvel
2018-03-20 3:33 ` Mark Rutland
2018-03-20 4:09 ` Ard Biesheuvel
2018-03-19 11:19 ` [RFC PATCH 2/6] arm64/mm: create dedicated segment for pgdir mappings Ard Biesheuvel
2018-03-19 11:19 ` [RFC PATCH 3/6] arm64/mm: use physical address as cpu_replace_ttbr1() argument Ard Biesheuvel
2018-03-19 11:19 ` [RFC PATCH 4/6] arm64/mm: stop using __pa_symbol() for swapper_pg_dir Ard Biesheuvel
2018-03-19 11:19 ` [RFC PATCH 5/6] arm64/mm: factor out clear_page() for unmapped memory Ard Biesheuvel
2018-03-19 11:19 ` [RFC PATCH 6/6] arm64/mm: use independent physical allocation for pgdir segment Ard Biesheuvel
2018-03-19 16:17 ` Ard Biesheuvel
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