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linux/arch/arm64/kernel
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Rob Herring 6e3ae2927b arm64: errata: Add Cortex-A520 speculative unprivileged load workaround 
commit 471470bc70 upstream.

Implement the workaround for ARM Cortex-A520 erratum 2966298. On an
affected Cortex-A520 core, a speculatively executed unprivileged load
might leak data from a privileged load via a cache side channel. The
issue only exists for loads within a translation regime with the same
translation (e.g. same ASID and VMID). Therefore, the issue only affects
the return to EL0.

The workaround is to execute a TLBI before returning to EL0 after all
loads of privileged data. A non-shareable TLBI to any address is
sufficient.

The workaround isn't necessary if page table isolation (KPTI) is
enabled, but for simplicity it will be. Page table isolation should
normally be disabled for Cortex-A520 as it supports the CSV3 feature
and the E0PD feature (used when KASLR is enabled).

Cc: stable@vger.kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230921194156.1050055-2-robh@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2023-10-10 22:00:39 +02:00
..
pi arm64: adjust KASLR relocation after ARCH_RANDOM removal 2022-08-17 14:52:50 +01:00
probes arm64/kprobe: Optimize the performance of patching single-step slot 2022-09-30 09:17:15 +01:00
vdso arm64 updates for 6.1: 2022-10-06 11:51:49 -07:00
vdso32 arm64: vdso32: Add DWARF_DEBUG 2022-07-01 12:07:43 +01:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
acpi.c arm64: mm: Convert to GENERIC_IOREMAP 2022-06-27 12:22:31 +01:00
acpi_numa.c arm64: numa: Don't check node against MAX_NUMNODES 2022-07-19 19:10:28 +01:00
acpi_parking_protocol.c treewide: Drop function_nocfi 2022-09-26 10:13:14 -07:00
alternative.c arm64 updates for 6.1: 2022-10-06 11:51:49 -07:00
armv8_deprecated.c arm64: fix oops in concurrently setting insn_emulation sysctls 2022-07-04 12:18:47 +01:00
asm-offsets.c KVM: arm64: Drop unused workaround_flags vcpu field 2021-12-08 14:54:07 +00:00
cacheinfo.c arm64: cacheinfo: Fix incorrect assignment of signed error value to unsigned fw_level 2022-08-23 11:10:24 +01:00
compat_alignment.c arm64: compat: Work around uninitialized variable warning 2023-04-13 16:55:24 +02:00
cpu-reset.S arm64: Add types to indirect called assembly functions 2022-09-26 10:13:13 -07:00
cpu_errata.c arm64: errata: Add Cortex-A520 speculative unprivileged load workaround 2023-10-10 22:00:39 +02:00
cpu_ops.c arm64: Introduce get_cpu_ops() helper function 2020-03-24 17:24:19 +00:00
cpufeature.c arm64: cpufeature: Fix CLRBHB and BC detection 2023-10-10 22:00:37 +02:00
cpuidle.c arm64: cpuidle: remove generic cpuidle support 2022-06-23 14:19:33 +01:00
cpuinfo.c arm64/sysreg: Add hwcap for SVE EBF16 2022-09-06 18:53:52 +01:00
crash_core.c arm64: crash_core: Export MODULES, VMALLOC, and VMEMMAP ranges 2022-03-07 21:25:47 +00:00
crash_dump.c vmcore: convert copy_oldmem_page() to take an iov_iter 2022-04-29 14:37:59 -07:00
debug-monitors.c arm64: kgdb: Set PSTATE.SS to 1 to re-enable single-step 2023-05-11 23:03:16 +09:00
efi-entry.S arm64: Rename arm64-internal cache maintenance functions 2021-05-25 19:27:49 +01:00
efi-header.S arm64: efi: Set NX compat flag in PE/COFF header 2023-04-06 12:10:37 +02:00
efi-rt-wrapper.S arm64: efi: Avoid workqueue to check whether EFI runtime is live 2023-02-01 08:34:34 +01:00
efi.c arm64: efi: Make efi_rt_lock a raw_spinlock 2023-03-11 13:55:43 +01:00
elfcore.c arm64: mte: Fix/clarify the PG_mte_tagged semantics 2023-03-11 13:55:44 +01:00
entry-common.c arm64: entry: avoid kprobe recursion 2022-11-01 17:43:31 +00:00
entry-fpsimd.S arm64/sme: Implement ZA context switching 2022-04-22 18:51:02 +01:00
entry-ftrace.S arm64: ftrace: Define ftrace_stub_graph only with FUNCTION_GRAPH_TRACER 2022-11-14 12:28:52 +00:00
entry.S arm64: errata: Add Cortex-A520 speculative unprivileged load workaround 2023-10-10 22:00:39 +02:00
fpsimd.c arm64/fpsimd: Only provide the length to cpufeature for xCR registers 2023-09-13 09:42:29 +02:00
ftrace.c arm64 updates for 6.1: 2022-10-06 11:51:49 -07:00
head.S arm64: Always load shadow stack pointer directly from the task struct 2023-05-11 23:02:59 +09:00
hibernate-asm.S arm64: kexec: install a copy of the linear-map 2021-10-01 13:31:00 +01:00
hibernate.c arm64: mte: Fix/clarify the PG_mte_tagged semantics 2023-03-11 13:55:44 +01:00
hw_breakpoint.c hw_breakpoint: fix single-stepping when using bpf_overflow_handler 2023-09-23 11:11:00 +02:00
hyp-stub.S arm64/sysreg: Standardise naming for ID_AA64MMFR1_EL1 fields 2022-09-09 10:59:03 +01:00
idle.c Merge branch 'for-next/entry' into for-next/core 2021-06-24 14:01:55 +01:00
idreg-override.c arm64/sysreg: Standardise naming for ID_AA64MMFR1_EL1 fields 2022-09-09 10:59:03 +01:00
image-vars.h EFI updates for v6.1 2022-10-09 08:56:54 -07:00
image.h arm64: get rid of TEXT_OFFSET 2020-09-07 15:00:52 +01:00
io.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
irq.c arm64: run softirqs on the per-CPU IRQ stack 2022-09-09 19:01:38 +01:00
jump_label.c jump_label: make initial NOP patching the special case 2022-06-24 09:48:55 +02:00
kaslr.c random: handle archrandom with multiple longs 2022-07-25 13:26:14 +02:00
kexec_image.c arm64: kexec_file: use more system keyrings to verify kernel image signature 2022-07-15 12:21:16 -04:00
kgdb.c arm64: kgdb: Set PSTATE.SS to 1 to re-enable single-step 2023-05-11 23:03:16 +09:00
kuser32.S arm64: compat: Move kuser32.S to .rodata section 2022-06-23 16:01:42 +01:00
machine_kexec.c treewide: Drop function_nocfi 2022-09-26 10:13:14 -07:00
machine_kexec_file.c arm64/kexec: Fix missing extra range for crashkres_low. 2022-09-01 11:50:00 +01:00
Makefile Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
module-plts.c arm64: module: Use module_init_layout_section() to spot init sections 2023-09-02 09:16:19 +02:00
module.c arm64: module: move find_section to header 2022-09-09 12:27:25 +01:00
mte.c arm64: mte: Do not set PG_mte_tagged if tags were not initialized 2023-05-24 17:32:52 +01:00
paravirt.c arm64: paravirt: Use RCU read locks to guard stolen_time 2022-05-17 14:23:37 +01:00
patching.c arm64: patch_text: Fixup last cpu should be master 2022-04-08 11:43:46 +01:00
pci.c arm64: PCI: Support root bridge preparation for Hyper-V 2021-08-23 10:59:26 +01:00
perf_callchain.c Peter Zijlstra says: 2022-01-12 16:26:58 -08:00
perf_event.c arm64/sysreg: Use feature numbering for PMU and SPE revisions 2022-09-16 12:38:57 +01:00
perf_regs.c perf: arm64: Add SVE vector granule register to user regs 2022-09-22 15:06:02 +01:00
pointer_auth.c arm64: move preemption disablement to prctl handlers 2021-07-28 18:33:49 +01:00
process.c Random number generator fixes for Linux 6.1-rc1. 2022-10-16 15:27:07 -07:00
proton-pack.c arm64: Add AMPERE1 to the Spectre-BHB affected list 2022-10-12 17:36:06 +01:00
psci.c treewide: Drop function_nocfi 2022-09-26 10:13:14 -07:00
ptrace.c arm64/ptrace: Clean up error handling path in sve_set_common() 2023-09-13 09:42:28 +02:00
reloc_test_core.c ARM64: reloc_test: add __init/__exit annotations to module init/exit funcs 2022-09-29 18:04:25 +01:00
reloc_test_syms.S arm64: kernel: Convert to modern annotations for assembly functions 2020-05-04 12:46:03 +01:00
relocate_kernel.S arm64: kexec: load from kimage prior to clobbering 2022-05-17 14:25:35 +01:00
return_address.c arm64: Make return_address() use arch_stack_walk() 2021-12-10 14:06:04 +00:00
sdei.c arm64: sdei: abort running SDEI handlers during crash 2023-09-13 09:43:03 +02:00
setup.c arm64: fix KASAN_INLINE 2022-07-20 16:08:10 +01:00
signal.c arm64/ptrace: Ensure that SME is set up for target when writing SSVE state 2023-08-23 17:52:41 +02:00
signal32.c signal: Deliver SIGTRAP on perf event asynchronously if blocked 2022-04-22 12:14:05 +02:00
sigreturn32.S arm64: compat: Move sigreturn32.S to .rodata section 2022-07-01 12:05:45 +01:00
sleep.S arm64: mm: fix resume for 52-bit enabled builds 2022-09-10 14:46:28 +01:00
smccc-call.S arm64: smccc: Save lr before calling __arm_smccc_sve_check() 2021-07-21 11:23:25 +01:00
smp.c arm64: sdei: abort running SDEI handlers during crash 2023-09-13 09:43:03 +02:00
smp_spin_table.c treewide: Drop function_nocfi 2022-09-26 10:13:14 -07:00
stacktrace.c arm64: efi: Account for the EFI runtime stack in stack unwinder 2023-02-01 08:34:35 +01:00
suspend.c arm64: mte: move register initialization to C 2022-09-22 18:02:50 +01:00
sys.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
sys32.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 452 2019-06-19 17:09:08 +02:00
sys_compat.c arm64: compat: Do not treat syscall number as ESR_ELx for a bad syscall 2022-04-29 19:26:27 +01:00
syscall.c treewide: use get_random_{u8,u16}() when possible, part 1 2022-10-11 17:42:58 -06:00
time.c arm64: Make profile_pc() use arch_stack_walk() 2021-12-10 14:06:04 +00:00
topology.c RISC-V Patches for the 6.1 Merge Window, Part 1 2022-10-09 13:24:01 -07:00
trace-events-emulation.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
traps.c arm64 updates for 6.1: 2022-10-06 11:51:49 -07:00
vdso-wrap.S arm64: do not descend to vdso directories twice 2021-01-20 12:18:46 +00:00
vdso.c arm64: vdso: Pass (void *) to virt_to_page() 2023-06-09 10:34:14 +02:00
vdso32-wrap.S arm64: do not descend to vdso directories twice 2021-01-20 12:18:46 +00:00
vmlinux.lds.S Merge branch 'for-next/boot' into for-next/core 2022-07-25 10:59:15 +01:00