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Date: Tue, 13 Sep 2016 18:46:30 +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>,
kernel-hardening@...ts.openwall.com
Subject: [PATCH v3 0/7] arm64: Privileged Access Never using TTBR0_EL1 switching
This is the third version of the arm64 PAN emulation using TTBR0_EL1
switching. The series has not yet included the alternative nop patches
from Mark Rutland, nor the empty_zero_page from Ard B. This will be done
in a subsequent version once 4.9-rc1 is out (which will include Mark's
alternative nop patches).
Changes since v2:
- efi_set_pgd() reworked to update the saved ttbr0 during run-time
services as this value is used during exception return
- uaccess_(enable|disable) C macros no longer take an 'alt' parameter
Instead, uaccess_(enable|disable)_not_uao are introduced for the case
where hardware PAN switching is not required when UAO is present
- post_ttbr0_update_workaround macro no longer takes a 'ret' parameter
- system_supports_ttbr0_pan renamed to system_uses_ttbr0_pan
- init_thread_info.ttbr0 moved towards the end of the setup_arch()
function and comment updated
- vmlinux.lds.S fixed to use RESERVED_TTBR0_SIZE
- Config option changed to ARM64_SW_TTBR0_PAN
- Some comment clean-ups and commit log updates
Catalin Marinas (7):
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
The patches are also available on this branch:
git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux ttbr0-pan
Thanks for reviewing/testing.
arch/arm64/Kconfig | 8 ++
arch/arm64/include/asm/assembler.h | 33 +++++++
arch/arm64/include/asm/cpufeature.h | 6 ++
arch/arm64/include/asm/efi.h | 26 ++++-
arch/arm64/include/asm/futex.h | 14 +--
arch/arm64/include/asm/kernel-pgtable.h | 7 ++
arch/arm64/include/asm/mmu_context.h | 51 +++++++---
arch/arm64/include/asm/ptrace.h | 2 +
arch/arm64/include/asm/thread_info.h | 3 +
arch/arm64/include/asm/uaccess.h | 163 ++++++++++++++++++++++++++++++--
arch/arm64/kernel/armv8_deprecated.c | 10 +-
arch/arm64/kernel/asm-offsets.c | 3 +
arch/arm64/kernel/cpufeature.c | 1 +
arch/arm64/kernel/entry.S | 71 +++++++++++++-
arch/arm64/kernel/head.S | 6 +-
arch/arm64/kernel/setup.c | 9 ++
arch/arm64/kernel/vmlinux.lds.S | 5 +
arch/arm64/lib/clear_user.S | 8 +-
arch/arm64/lib/copy_from_user.S | 8 +-
arch/arm64/lib/copy_in_user.S | 8 +-
arch/arm64/lib/copy_to_user.S | 8 +-
arch/arm64/mm/context.c | 7 +-
arch/arm64/mm/fault.c | 22 +++--
arch/arm64/mm/proc.S | 11 +--
arch/arm64/xen/hypercall.S | 19 ++++
25 files changed, 428 insertions(+), 81 deletions(-)
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