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af483947d4
linux/arch/arm64/kernel
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haibinzhang (张海斌) af483947d4 arm64: fix oops in concurrently setting insn_emulation sysctls 
emulation_proc_handler() changes table->data for proc_dointvec_minmax
and can generate the following Oops if called concurrently with itself:

 | Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010
 | Internal error: Oops: 96000006 [#1] SMP
 | Call trace:
 | update_insn_emulation_mode+0xc0/0x148
 | emulation_proc_handler+0x64/0xb8
 | proc_sys_call_handler+0x9c/0xf8
 | proc_sys_write+0x18/0x20
 | __vfs_write+0x20/0x48
 | vfs_write+0xe4/0x1d0
 | ksys_write+0x70/0xf8
 | __arm64_sys_write+0x20/0x28
 | el0_svc_common.constprop.0+0x7c/0x1c0
 | el0_svc_handler+0x2c/0xa0
 | el0_svc+0x8/0x200

To fix this issue, keep the table->data as &insn->current_mode and
use container_of() to retrieve the insn pointer. Another mutex is
used to protect against the current_mode update but not for retrieving
insn_emulation as table->data is no longer changing.

Co-developed-by: hewenliang <hewenliang4@huawei.com>
Signed-off-by: hewenliang <hewenliang4@huawei.com>
Signed-off-by: Haibin Zhang <haibinzhang@tencent.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20220128090324.2727688-1-hewenliang4@huawei.com
Link: https://lore.kernel.org/r/9A004C03-250B-46C5-BF39-782D7551B00E@tencent.com
Signed-off-by: Will Deacon <will@kernel.org>
2022-07-04 12:18:47 +01:00
..
probes arm64: Treat ESR_ELx as a 64-bit register 2022-04-29 19:26:27 +01:00
vdso kernel-hardening updates for v5.19-rc1 2022-05-24 12:27:09 -07:00
vdso32 arm64: vdso: fix makefile dependency on vdso.so 2022-05-10 12:08:40 +01:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
acpi_numa.c arm64, numa: Change the numa init functions name to be generic 2021-01-14 15:08:54 -08:00
acpi_parking_protocol.c arm64: use function_nocfi with __pa_symbol 2021-04-08 16:04:22 -07:00
acpi.c arm64: Simplify checking for populated DT 2021-12-06 16:12:53 +00:00
alternative.c arm64: alternatives: mark patch_alternative() as noinstr 2022-04-06 11:23:48 +01:00
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 drivers: base: cacheinfo: Get rid of DEFINE_SMP_CALL_CACHE_FUNCTION() 2021-09-01 10:29:10 +02:00
cpu_errata.c arm64 updates for 5.19: 2022-05-23 21:06:11 -07:00
cpu_ops.c arm64: Introduce get_cpu_ops() helper function 2020-03-24 17:24:19 +00:00
cpu-reset.S arm64: kexec: remove cpu-reset.h 2021-10-01 13:31:00 +01:00
cpufeature.c arm64 fixes for 5.19-rc3: 2022-06-17 13:55:19 -05:00
cpuidle.c cpuidle: PSCI: Move the has_lpi check to the beginning of the function 2022-03-03 20:20:06 +01:00
cpuinfo.c Merge branch kvm-arm64/wfxt into kvmarm-master/next 2022-05-04 09:42:16 +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: Treat ESR_ELx as a 64-bit register 2022-04-29 19:26:27 +01:00
efi-entry.S arm64: Rename arm64-internal cache maintenance functions 2021-05-25 19:27:49 +01:00
efi-header.S arm64: head: tidy up the Image header definition 2020-11-17 16:14:20 +00:00
efi-rt-wrapper.S Merge branch 'for-next/scs' into for-next/core 2020-05-28 18:03:40 +01:00
efi.c arm64: efi: Export screen_info 2021-08-04 16:54:36 +00:00
elfcore.c elf: Fix the arm64 MTE ELF segment name and value 2022-04-28 11:37:06 +01:00
entry-common.c Locking changes in this cycle were: 2022-05-24 10:18:23 -07:00
entry-fpsimd.S arm64/sme: Implement ZA context switching 2022-04-22 18:51:02 +01:00
entry-ftrace.S arm64: ftrace: remove redundant label 2022-06-15 16:14:47 +01:00
entry.S arm64: entry: use stackleak_erase_on_task_stack() 2022-05-08 01:33:09 -07:00
fpsimd.c arm64/sme: Fix EFI save/restore 2022-06-10 17:29:23 +01:00
ftrace.c arm64: ftrace: consistently handle PLTs. 2022-06-15 16:14:47 +01:00
head.S sched: move CPU field back into thread_info if THREAD_INFO_IN_TASK=y 2021-09-30 16:13:10 +02:00
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 syntax errors in comments 2022-06-02 20:16:22 +01:00
hw_breakpoint.c arm64: Treat ESR_ELx as a 64-bit register 2022-04-29 19:26:27 +01:00
hyp-stub.S Merge remote-tracking branch 'arm64/for-next/vhe-only' into kvmarm-master/next 2021-04-13 15:42:40 +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: Add support of PAuth QARMA3 architected algorithm 2022-02-25 13:38:52 +00:00
image-vars.h ARM: 2022-03-24 11:58:57 -07:00
image.h arm64: get rid of TEXT_OFFSET 2020-09-07 15:00:52 +01:00
io.c
irq.c arm64: irq: allow FIQs to be handled 2021-03-24 20:19:30 +00:00
jump_label.c arm64: insn: decouple patching from insn code 2021-06-11 11:19:27 +01:00
kaslr.c arm64: fix the doc of RANDOMIZE_MODULE_REGION_FULL 2021-08-03 10:36:42 +01:00
kexec_image.c arm64: kexec_file: Fix sparse warning 2020-11-10 13:11:44 +00:00
kgdb.c arm64: Treat ESR_ELx as a 64-bit register 2022-04-29 19:26:27 +01:00
kuser32.S
machine_kexec_file.c arm64: kdump: Reimplement crashkernel=X 2022-05-07 19:54:33 +01:00
machine_kexec.c arm64: kdump: Reimplement crashkernel=X 2022-05-07 19:54:33 +01:00
Makefile arm64: vdso: fix makefile dependency on vdso.so 2022-05-10 12:08:40 +01:00
module-plts.c arm64: fix typos in comments 2022-04-04 10:32:50 +01:00
module.c kasan, arm64: don't tag executable vmalloc allocations 2022-03-24 19:06:48 -07:00
mte.c arm64: Add kasan_hw_tags_enable() prototype to silence sparse 2022-06-10 18:04:05 +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: perf: Expose some Armv9 common events under sysfs 2022-03-08 11:40:44 +00:00
perf_regs.c perf/arch: Remove perf_sample_data::regs_user_copy 2020-11-09 18:12:34 +01:00
pointer_auth.c arm64: move preemption disablement to prctl handlers 2021-07-28 18:33:49 +01:00
process.c This set of changes updates init and user mode helper tasks to be 2022-06-03 16:03:05 -07:00
proton-pack.c arm64: Add part number for Arm Cortex-A78AE 2022-04-08 11:46:46 +01:00
psci.c arm64: use function_nocfi with __pa_symbol 2021-04-08 16:04:22 -07:00
ptrace.c arm64/sme: Remove _EL0 from name of SVCR - FIXME sysreg.h 2022-05-16 19:50:20 +01:00
reloc_test_core.c
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: kernel: add helper for booted at EL2 and not VHE 2021-10-01 13:30:59 +01:00
setup.c Revert "arm64: Initialize jump labels before setup_machine_fdt()" 2022-06-15 16:14:32 +01:00
signal32.c signal: Deliver SIGTRAP on perf event asynchronously if blocked 2022-04-22 12:14:05 +02:00
signal.c arm64 fixes for 5.19-rc1: 2022-06-03 14:05:34 -07:00
sigreturn32.S
sleep.S kasan: remove redundant config option 2021-04-16 16:10:36 -07:00
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 arm64: Rename arm64-internal cache maintenance functions 2021-05-25 19:27:49 +01:00
smp.c cpufreq: CPPC: Add per_cpu efficiency_class 2022-05-06 21:01:17 +02:00
stacktrace.c arm64: stacktrace: align with common naming 2022-04-22 15:33:14 +01:00
suspend.c arm64: fix typos in comments 2022-04-04 10:32:50 +01:00
sys32.c
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
sys.c
syscall.c arm64/sme: Remove _EL0 from name of SVCR - FIXME sysreg.h 2022-05-16 19:50:20 +01:00
time.c arm64: Make profile_pc() use arch_stack_walk() 2021-12-10 14:06:04 +00:00
topology.c topology: Represent clusters of CPUs within a die 2021-10-15 11:25:15 +02:00
trace-events-emulation.h
traps.c Merge branch 'for-next/esr-elx-64-bit' into for-next/core 2022-05-20 18:51:54 +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 Merge branches 'for-next/misc', 'for-next/kselftest', 'for-next/xntable', 'for-next/vdso', 'for-next/fiq', 'for-next/epan', 'for-next/kasan-vmalloc', 'for-next/fgt-boot-init', 'for-next/vhe-only' and 'for-next/neon-softirqs-disabled', remote-tracking branch 'arm64/for-next/perf' into for-next/core 2021-04-15 14:00:38 +01:00
vmlinux.lds.S arm64: lds: move special code sections out of kernel exec segment 2022-05-17 09:32:38 +01:00