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67ab51cbdf
linux-stable/arch/arm64/kernel
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Will Deacon 67ab51cbdf arm64: tls: Fix context-switching of tpidrro_el0 when kpti is enabled 
Commit 18011eac28 ("arm64: tls: Avoid unconditional zeroing of
tpidrro_el0 for native tasks") tried to optimise the context switching
of tpidrro_el0 by eliding the clearing of the register when switching
to a native task with kpti enabled, on the erroneous assumption that
the kpti trampoline entry code would already have taken care of the
write.

Although the kpti trampoline does zero the register on entry from a
native task, the check in tls_thread_switch() is on the *next* task and
so we can end up leaving a stale, non-zero value in the register if the
previous task was 32-bit.

Drop the broken optimisation and zero tpidrro_el0 unconditionally when
switching to a native 64-bit task.

Cc: Mark Rutland <mark.rutland@arm.com>
Cc: stable@vger.kernel.org
Fixes: 18011eac28 ("arm64: tls: Avoid unconditional zeroing of tpidrro_el0 for native tasks")
Signed-off-by: Will Deacon <will@kernel.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20241114095332.23391-1-will@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2024-11-14 12:04:13 +00:00
..
pi arm64/mm: Change protval as 'pteval_t' in map_range() 2024-11-12 14:46:17 +00:00
probes arm64: uprobes: Optimize cache flushes for xol slot 2024-11-08 16:25:21 +00:00
vdso arm64: vDSO: Wire up getrandom() vDSO implementation 2024-09-13 17:28:36 +02:00
vdso32 arm64/vdso: Remove --hash-style=sysv 2024-07-23 15:28:23 +01:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
acpi_numa.c arm64: ACPI: NUMA: initialize all values of acpi_early_node_map to NUMA_NO_NODE 2024-08-14 17:51:39 +01:00
acpi_parking_protocol.c arm64: smp: Remove dedicated wakeup IPI 2023-09-25 17:15:28 +01:00
acpi.c Merge branch 'for-next/vcpu-hotplug' into for-next/core 2024-07-11 19:10:02 +01:00
alternative.c Merge branches 'for-next/kpti', 'for-next/missing-proto-warn', 'for-next/iss2-decode', 'for-next/kselftest', 'for-next/misc', 'for-next/feat_mops', 'for-next/module-alloc', 'for-next/sysreg', 'for-next/cpucap', 'for-next/acpi', 'for-next/kdump', 'for-next/acpi-doc', 'for-next/doc' and 'for-next/tpidr2-fix', remote-tracking branch 'arm64/for-next/perf' into for-next/core 2023-06-23 18:32:20 +01:00
armv8_deprecated.c sysctl: treewide: constify the ctl_table argument of proc_handlers 2024-07-24 20:59:29 +02:00
asm-offsets.c KVM: arm64: Fix clobbered ELR in sync abort/SError 2024-06-20 17:40:53 +00:00
cacheinfo.c cacheinfo: Add arm64 early level initializer implementation 2023-04-13 09:32:33 +01:00
compat_alignment.c arm64: compat: Work around uninitialized variable warning 2023-04-05 17:51:47 +01:00
cpu_errata.c arm64: errata: Enable the AC03_CPU_38 workaround for ampere1a 2024-08-30 14:22:12 +01:00
cpu_ops.c arm64: Introduce get_cpu_ops() helper function 2020-03-24 17:24:19 +00:00
cpu-reset.S arm64: kernel: remove SHF_WRITE|SHF_EXECINSTR from .idmap.text 2023-05-02 12:42:22 +01:00
cpufeature.c arm64: Expose ID_AA64ISAR1_EL1.XS to sanitised feature consumers 2024-11-01 16:35:57 +00:00
cpuinfo.c Merge branch 'for-next/poe' into for-next/core 2024-09-12 13:43:41 +01:00
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: Return early when break handler is found on linked-list 2024-11-01 15:31:02 +00:00
efi-header.S arm64: efi: Enable BTI codegen and add PE/COFF annotation 2023-04-20 15:43:45 +02:00
efi-rt-wrapper.S arm64: efi: Avoid workqueue to check whether EFI runtime is live 2023-01-16 15:27:31 +01:00
efi.c efi/arm64: Fix kmemleak false positive in arm64_efi_rt_init() 2024-06-15 10:25:02 +02:00
elfcore.c arm64: mte: Avoid the racy walk of the vma list during core dump 2023-01-05 15:12:12 +00:00
entry-common.c treewide: context_tracking: Rename CONTEXT_* into CT_STATE_* 2024-07-29 07:33:10 +05:30
entry-fpsimd.S arm64/sme: Implement context switching for ZT0 2023-01-20 12:23:06 +00:00
entry-ftrace.S arm64: ftrace: Enable HAVE_FUNCTION_GRAPH_RETVAL 2023-06-20 18:38:37 -04:00
entry.S arm64: entry: simplify kernel_exit logic 2024-01-18 11:00:09 +00:00
fpsimd.c arm64/fpsimd: Fix a typo 2024-11-04 12:48:24 +00:00
ftrace.c arm64: module: mandate MODULE_PLTS 2023-06-06 17:39:05 +01:00
head.S arm64/head: Disable MMU at EL2 before clearing HCR_EL2.E2H 2024-04-18 18:00:55 +01:00
hibernate-asm.S arm64: kexec: install a copy of the linear-map 2021-10-01 13:31:00 +01:00
hibernate.c arm64: hibernate: Fix warning for cast from restricted gfp_t 2024-09-12 12:48:58 +01:00
hw_breakpoint.c perf/bpf: Remove unneeded uses_default_overflow_handler() 2024-04-12 11:49:50 +02:00
hyp-stub.S ARM64: 2023-07-03 15:32:22 -07:00
idle.c arm64: idle: Tag the arm64 idle functions as __cpuidle 2023-09-25 17:15:28 +01:00
image-vars.h arm64: irqchip/gic-v3: Select priorities at boot time 2024-06-24 18:16:45 +01:00
image.h arm64: get rid of TEXT_OFFSET 2020-09-07 15:00:52 +01:00
io.c arm64/io: Provide a WC friendly __iowriteXX_copy() 2024-04-22 17:11:20 -03:00
irq.c arm64: irq: set the correct node for shadow call stack 2023-12-13 12:09:00 +00:00
jump_label.c arm64: jump_label: Ensure patched jump_labels are visible to all CPUs 2024-08-02 15:07:01 +01:00
kaslr.c arm64: kaslr: Use feature override instead of parsing the cmdline again 2024-02-16 12:42:31 +00:00
kexec_image.c kexec_file, arm64: print out debugging message if required 2023-12-20 15:02:57 -08:00
kgdb.c arm64: kgdb: Set PSTATE.SS to 1 to re-enable single-step 2023-04-14 13:39:47 +01:00
kuser32.S arm64: Update Documentation/arm references 2023-06-12 06:33:48 -06:00
machine_kexec_file.c arm64, crash: wrap crash dumping code into crash related ifdefs 2024-02-23 17:48:23 -08:00
machine_kexec.c arm64, crash: wrap crash dumping code into crash related ifdefs 2024-02-23 17:48:23 -08:00
Makefile arm64: cpuidle: Move ACPI specific code into drivers/acpi/arm64/ 2024-06-13 10:18:40 +01:00
Makefile.syscalls syscalls: fix syscall macros for newfstat/newfstatat 2024-08-02 15:20:47 +02:00
module-plts.c Merge branch 'for-next/cpus_have_const_cap' into for-next/core 2023-10-26 17:10:18 +01:00
module.c arch: make execmem setup available regardless of CONFIG_MODULES 2024-05-14 00:31:44 -07:00
mte.c arm64: start using 'asm goto' for get_user() when available 2024-06-19 12:33:38 -07:00
paravirt.c arm64: paravirt: remove conduit check in has_pv_steal_clock 2022-11-09 18:11:56 +00:00
patching.c arm64: patching: fix handling of execmem addresses 2024-05-24 11:55:06 -07:00
pci.c arm64: PCI: Migrate ACPI related functions to pci-acpi.c 2024-08-27 15:48:34 +02:00
perf_callchain.c arm64: Add USER_STACKTRACE support 2024-05-03 14:12:45 +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 arm64: tls: Fix context-switching of tpidrro_el0 when kpti is enabled 2024-11-14 12:04:13 +00:00
proton-pack.c arm64: errata: Unify speculative SSBS errata logic 2024-06-12 16:07:21 +01:00
psci.c arm64: psci: Ignore DENIED CPUs 2024-06-28 18:38:31 +01:00
ptrace.c arm64/ptrace: Clarify documentation of VL configuration via ptrace 2024-11-12 14:53:34 +00:00
reloc_test_core.c ARM64: reloc_test: add missing MODULE_DESCRIPTION() macro 2024-06-13 10:23:54 +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 2023-08-04 17:35:33 +01:00
setup.c arm64: Fix KASAN random tag seed initialization 2024-08-15 11:04:56 +01:00
signal32.c arm64: rework compat syscall macros 2024-07-10 14:23:38 +02:00
signal.c arm64: add POE signal support 2024-09-04 12:54:05 +01:00
sigreturn32.S arm64: rework compat syscall macros 2024-07-10 14:23:38 +02:00
sleep.S arm64: mm: Handle LVA support as a CPU feature 2024-02-16 12:42:36 +00:00
smccc-call.S arm64: smccc: Save lr before calling __arm_smccc_sve_check() 2021-07-21 11:23:25 +01:00
smp_spin_table.c treewide: Drop function_nocfi 2022-09-26 10:13:14 -07:00
smp.c arm64 updates for 6.12 2024-09-16 06:55:07 +02:00
stacktrace.c arm64: stacktrace: fix the usage of ftrace_graph_ret_addr() 2024-09-05 15:03:35 +01:00
suspend.c arm64/sme: Restore SME registers on exit from suspend 2024-02-20 12:19:15 +00:00
sys32.c arm64: convert unistd_32.h to syscall.tbl format 2024-07-10 14:23:38 +02:00
sys_compat.c arm64: Avoid cpus_have_const_cap() for ARM64_WORKAROUND_1542419 2023-10-16 14:17:06 +01:00
sys.c arm64: generate 64-bit syscall.tbl 2024-07-10 14:23:38 +02:00
syscall.c arm64: convert unistd_32.h to syscall.tbl format 2024-07-10 14:23:38 +02:00
time.c arm64: Make profile_pc() use arch_stack_walk() 2021-12-10 14:06:04 +00:00
topology.c arm64/amu: Use capacity_ref_freq() to set AMU ratio 2023-12-23 15:52:36 +01:00
trace-events-emulation.h tracing/treewide: Remove second parameter of __assign_str() 2024-05-22 20:14:47 -04:00
traps.c Merge branch 'for-next/timers' into for-next/core 2024-09-12 13:44:03 +01:00
vdso32-wrap.S arm64: do not descend to vdso directories twice 2021-01-20 12:18:46 +00:00
vdso-wrap.S arm64: do not descend to vdso directories twice 2021-01-20 12:18:46 +00:00
vdso.c arm64: vDSO: Wire up getrandom() vDSO implementation 2024-09-13 17:28:36 +02:00
vmcore_info.c crash: split vmcoreinfo exporting code out from crash_core.c 2024-02-23 17:48:22 -08:00
vmlinux.lds.S arm64: fix .data.rel.ro size assertion when CONFIG_LTO_CLANG 2024-11-07 11:33:06 +00:00
watchdog_hld.c arm64: enable perf events based hard lockup detector 2023-06-09 17:44:22 -07:00