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Date: Fri, 28 Oct 2016 18:27:08 +0100
From: Catalin Marinas <catalin.marinas@....com>
To: linux-arm-kernel@...ts.infradead.org
Cc: Will Deacon <will.deacon@....com>,
James Morse <james.morse@....com>,
Kees Cook <keescook@...omium.org>,
Mark Rutland <mark.rutland@....com>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
AKASHI Takahiro <takahiro.akashi@...aro.org>,
Sami Tolvanen <samitolvanen@...gle.com>,
kernel-hardening@...ts.openwall.com
Subject: [PATCH v4 0/8] arm64: Privileged Access Never using TTBR0_EL1 switching
This is the fourth version of the arm64 PAN emulation using TTBR0_EL1
switching. The series does not include the empty_zero_page patch from
Ard B. as I didn't have an up to date patch, nor figured out where the
discussion was left.
The patches are available on this branch:
git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux ttbr0-pan
Changes since v3:
- Xen hyp call now only enables TTBR0_EL1 if needed without clearing PAN
- Fix for user space cache maintenance trapping/emulation
- Simplified asm macros based on Mark R's "alternative_else_nop_endif"
- Separate patch for fixing the synchronous external abort description
- #includes clean-up
Catalin Marinas (8):
arm64: Update the synchronous external abort fault description
arm64: Factor out PAN enabling/disabling into separate uaccess_*
macros
arm64: Factor out TTBR0_EL1 post-update workaround into a specific asm
macro
arm64: Introduce uaccess_{disable,enable} functionality based on
TTBR0_EL1
arm64: Disable TTBR0_EL1 during normal kernel execution
arm64: Handle faults caused by inadvertent user access with PAN
enabled
arm64: xen: Enable user access before a privcmd hvc call
arm64: Enable CONFIG_ARM64_SW_TTBR0_PAN
arch/arm64/Kconfig | 8 ++
arch/arm64/include/asm/assembler.h | 29 ++++++
arch/arm64/include/asm/cpufeature.h | 6 ++
arch/arm64/include/asm/efi.h | 26 ++++-
arch/arm64/include/asm/futex.h | 17 ++--
arch/arm64/include/asm/kernel-pgtable.h | 7 ++
arch/arm64/include/asm/mmu_context.h | 53 +++++++---
arch/arm64/include/asm/thread_info.h | 3 +
arch/arm64/include/asm/uaccess.h | 175 ++++++++++++++++++++++++++++++--
arch/arm64/kernel/armv8_deprecated.c | 11 +-
arch/arm64/kernel/asm-offsets.c | 3 +
arch/arm64/kernel/cpufeature.c | 1 +
arch/arm64/kernel/entry.S | 67 +++++++++++-
arch/arm64/kernel/head.S | 6 +-
arch/arm64/kernel/setup.c | 9 ++
arch/arm64/kernel/traps.c | 9 +-
arch/arm64/kernel/vmlinux.lds.S | 5 +
arch/arm64/lib/clear_user.S | 11 +-
arch/arm64/lib/copy_from_user.S | 11 +-
arch/arm64/lib/copy_in_user.S | 11 +-
arch/arm64/lib/copy_to_user.S | 11 +-
arch/arm64/mm/cache.S | 6 +-
arch/arm64/mm/context.c | 7 +-
arch/arm64/mm/fault.c | 22 ++--
arch/arm64/mm/proc.S | 6 +-
arch/arm64/xen/hypercall.S | 15 +++
26 files changed, 437 insertions(+), 98 deletions(-)
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