Hello,
Here is an attempt to backport arm64 spectre patches to v4.4 stable tree.
I have started this backport with Mark Rutland's backport of Spectre to 4.9 [1] and tried applying the upstream version of them over 4.4 and resolved conflicts by checking how they have been resolved in 4.9.
I had to pick few extra upstream patches to avoid unnecessary conflicts (upstream commit ids mentioned):
a842789837c0 arm64: remove duplicate macro __KERNEL__ check 64f8ebaf115b mm/kasan: add API to check memory regions bffe1baff5d5 arm64: kasan: instrument user memory access API 92406f0cc9e3 arm64: cpufeature: Add scope for capability check 9eb8a2cdf65c arm64: cputype info for Broadcom Vulcan 0d90718871fe arm64: cputype: Add MIDR values for Cavium ThunderX2 CPUs 98dd64f34f47 ARM: 8478/2: arm/arm64: add arm-smccc
I had to drop few patches as well as they weren't getting applied properly due to missing files/features (upstream commit id mentioned):
93f339ef4175 arm64: cpufeature: __this_cpu_has_cap() shouldn't stop early 3c31fa5a06b4 arm64: Run enable method for errata work arounds on late CPUs 6840bdd73d07 arm64: KVM: Use per-CPU vector when BP hardening is enabled 90348689d500 arm64: KVM: Make PSCI_VERSION a fast path
Since v4.4 doesn't contain arch/arm/kvm/hyp/switch.c file, changes for it are dropped from some of the patches. The commit log of specific patches are updated with this information.
Also for commit id (from 4.9 stable): c24c205d2528 arm64: Add ARM_SMCCC_ARCH_WORKAROUND_1 BP hardening support
I have dropped arch/arm64/crypto/sha256-core.S and sha512-core.S files as they weren't part of the upstream commit. Not sure why it was included by Mark as the commit log doesn't provide any reasoning for it.
The patches in this series are pushed here [2].
This is only build/boot tested by me as I don't have access to the required test-suite which can verify spectre mitigations.
@Julien: Can you please help reviewing / testing them ? Thanks.
-- viresh
[1] https://patches.linaro.org/cover/133195/ with top commit in 4.9 stable tree: a3b292fe0560 arm64: futex: Mask __user pointers prior to dereference
[2] https://git.kernel.org/pub/scm/linux/kernel/git/vireshk/linux.git stable/v4.4.y/spectre
Andrey Ryabinin (1): mm/kasan: add API to check memory regions
Catalin Marinas (1): arm64: Factor out TTBR0_EL1 post-update workaround into a specific asm macro
Jayachandran C (3): arm64: cputype info for Broadcom Vulcan arm64: cputype: Add MIDR values for Cavium ThunderX2 CPUs arm64: Branch predictor hardening for Cavium ThunderX2
Jens Wiklander (1): ARM: 8478/2: arm/arm64: add arm-smccc
Laura Abbott (1): mm: Introduce lm_alias
Marc Zyngier (14): arm64: Move post_ttbr_update_workaround to C code arm64: Move BP hardening to check_and_switch_context arm64: cpu_errata: Allow an erratum to be match for all revisions of a core arm64: KVM: Increment PC after handling an SMC trap arm/arm64: KVM: Add PSCI_VERSION helper arm/arm64: KVM: Add smccc accessors to PSCI code arm/arm64: KVM: Implement PSCI 1.0 support arm64: KVM: Add SMCCC_ARCH_WORKAROUND_1 fast handling firmware/psci: Expose PSCI conduit firmware/psci: Expose SMCCC version through psci_ops arm/arm64: smccc: Make function identifiers an unsigned quantity arm/arm64: smccc: Implement SMCCC v1.1 inline primitive arm64: Add ARM_SMCCC_ARCH_WORKAROUND_1 BP hardening support arm64: Kill PSCI_GET_VERSION as a variant-2 workaround
Mark Rutland (4): arm/arm64: KVM: Consolidate the PSCI include files arm/arm64: KVM: Advertise SMCCC v1.1 arm/arm64: KVM: Turn kvm_psci_version into a static inline arm64: KVM: Report SMCCC_ARCH_WORKAROUND_1 BP hardening support
Robin Murphy (3): arm64: Implement array_index_mask_nospec() arm64: Make USER_DS an inclusive limit arm64: Use pointer masking to limit uaccess speculation
Suzuki K Poulose (1): arm64: cpufeature: Add scope for capability check
Will Deacon (13): arm64: barrier: Add CSDB macros to control data-value prediction arm64: entry: Ensure branch through syscall table is bounded under speculation arm64: uaccess: Prevent speculative use of the current addr_limit arm64: uaccess: Don't bother eliding access_ok checks in __{get, put}_user arm64: uaccess: Mask __user pointers for __arch_{clear, copy_*}_user arm64: cpufeature: Pass capability structure to ->enable callback drivers/firmware: Expose psci_get_version through psci_ops structure arm64: Add skeleton to harden the branch predictor against aliasing attacks arm64: entry: Apply BP hardening for high-priority synchronous exceptions arm64: entry: Apply BP hardening for suspicious interrupts from EL0 arm64: cputype: Add missing MIDR values for Cortex-A72 and Cortex-A75 arm64: Implement branch predictor hardening for affected Cortex-A CPUs arm64: futex: Mask __user pointers prior to dereference
Yang Shi (1): arm64: kasan: instrument user memory access API
Yury Norov (1): arm64: move TASK_* definitions to <asm/processor.h>
zijun_hu (1): arm64: remove duplicate macro __KERNEL__ check
MAINTAINERS | 14 ++ arch/arm/include/asm/kvm_host.h | 6 + arch/arm/include/asm/kvm_psci.h | 27 --- arch/arm/kvm/arm.c | 2 +- arch/arm/kvm/handle_exit.c | 4 +- arch/arm/kvm/psci.c | 143 ++++++++++++--- arch/arm64/Kconfig | 17 ++ arch/arm64/include/asm/assembler.h | 18 ++ arch/arm64/include/asm/barrier.h | 23 +++ arch/arm64/include/asm/cpufeature.h | 12 +- arch/arm64/include/asm/cputype.h | 12 ++ arch/arm64/include/asm/futex.h | 9 +- arch/arm64/include/asm/kvm_host.h | 5 + arch/arm64/include/asm/kvm_psci.h | 27 --- arch/arm64/include/asm/memory.h | 15 -- arch/arm64/include/asm/mmu.h | 39 ++++ arch/arm64/include/asm/processor.h | 26 ++- arch/arm64/include/asm/sysreg.h | 2 + arch/arm64/include/asm/uaccess.h | 175 ++++++++++++------ arch/arm64/kernel/Makefile | 5 + arch/arm64/kernel/arm64ksyms.c | 8 +- arch/arm64/kernel/bpi.S | 75 ++++++++ arch/arm64/kernel/cpu_errata.c | 185 ++++++++++++++++++- arch/arm64/kernel/cpufeature.c | 112 ++++++------ arch/arm64/kernel/entry.S | 26 ++- arch/arm64/kvm/handle_exit.c | 16 +- arch/arm64/kvm/hyp.S | 20 ++- arch/arm64/lib/clear_user.S | 6 +- arch/arm64/lib/copy_from_user.S | 4 +- arch/arm64/lib/copy_in_user.S | 4 +- arch/arm64/lib/copy_to_user.S | 4 +- arch/arm64/mm/context.c | 12 ++ arch/arm64/mm/fault.c | 31 ++++ arch/arm64/mm/proc.S | 12 +- drivers/firmware/Kconfig | 3 + drivers/firmware/psci.c | 58 +++++- include/kvm/arm_psci.h | 51 ++++++ include/linux/arm-smccc.h | 267 ++++++++++++++++++++++++++++ include/linux/kasan-checks.h | 12 ++ include/linux/mm.h | 4 + include/linux/psci.h | 14 ++ include/uapi/linux/psci.h | 3 + mm/kasan/kasan.c | 12 ++ 43 files changed, 1270 insertions(+), 250 deletions(-) delete mode 100644 arch/arm/include/asm/kvm_psci.h delete mode 100644 arch/arm64/include/asm/kvm_psci.h create mode 100644 arch/arm64/kernel/bpi.S create mode 100644 include/kvm/arm_psci.h create mode 100644 include/linux/arm-smccc.h create mode 100644 include/linux/kasan-checks.h