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0fbcd8abf3
linux/arch/arm64/kernel
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Masami Hiramatsu (Google) 0fbcd8abf3 arm64: Prohibit instrumentation on arch_stack_walk() 
Mark arch_stack_walk() as noinstr instead of notrace and inline functions
called from arch_stack_walk() as __always_inline so that user does not
put any instrumentations on it, because this function can be used from
return_address() which is used by lockdep.

Without this, if the kernel built with CONFIG_LOCKDEP=y, just probing
arch_stack_walk() via <tracefs>/kprobe_events will crash the kernel on
arm64.

 # echo p arch_stack_walk >> ${TRACEFS}/kprobe_events
 # echo 1 > ${TRACEFS}/events/kprobes/enable
  kprobes: Failed to recover from reentered kprobes.
  kprobes: Dump kprobe:
  .symbol_name = arch_stack_walk, .offset = 0, .addr = arch_stack_walk+0x0/0x1c0
  ------------[ cut here ]------------
  kernel BUG at arch/arm64/kernel/probes/kprobes.c:241!
  kprobes: Failed to recover from reentered kprobes.
  kprobes: Dump kprobe:
  .symbol_name = arch_stack_walk, .offset = 0, .addr = arch_stack_walk+0x0/0x1c0
  ------------[ cut here ]------------
  kernel BUG at arch/arm64/kernel/probes/kprobes.c:241!
  PREEMPT SMP
  Modules linked in:
  CPU: 0 PID: 17 Comm: migration/0 Tainted: G                 N 6.1.0-rc5+ #6
  Hardware name: linux,dummy-virt (DT)
  Stopper: 0x0 <- 0x0
  pstate: 600003c5 (nZCv DAIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
  pc : kprobe_breakpoint_handler+0x178/0x17c
  lr : kprobe_breakpoint_handler+0x178/0x17c
  sp : ffff8000080d3090
  x29: ffff8000080d3090 x28: ffff0df5845798c0 x27: ffffc4f59057a774
  x26: ffff0df5ffbba770 x25: ffff0df58f420f18 x24: ffff49006f641000
  x23: ffffc4f590579768 x22: ffff0df58f420f18 x21: ffff8000080d31c0
  x20: ffffc4f590579768 x19: ffffc4f590579770 x18: 0000000000000006
  x17: 5f6b636174735f68 x16: 637261203d207264 x15: 64612e202c30203d
  x14: 2074657366666f2e x13: 30633178302f3078 x12: 302b6b6c61775f6b
  x11: 636174735f686372 x10: ffffc4f590dc5bd8 x9 : ffffc4f58eb31958
  x8 : 00000000ffffefff x7 : ffffc4f590dc5bd8 x6 : 80000000fffff000
  x5 : 000000000000bff4 x4 : 0000000000000000 x3 : 0000000000000000
  x2 : 0000000000000000 x1 : ffff0df5845798c0 x0 : 0000000000000064
  Call trace:
  kprobes: Failed to recover from reentered kprobes.
  kprobes: Dump kprobe:
  .symbol_name = arch_stack_walk, .offset = 0, .addr = arch_stack_walk+0x0/0x1c0
  ------------[ cut here ]------------
  kernel BUG at arch/arm64/kernel/probes/kprobes.c:241!

Fixes: 39ef362d2d ("arm64: Make return_address() use arch_stack_walk()")
Cc: stable@vger.kernel.org
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/166994751368.439920.3236636557520824664.stgit@devnote3
Signed-off-by: Will Deacon <will@kernel.org>
2022-12-05 14:20:08 +00:00
..
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_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
acpi.c arm64: mm: Convert to GENERIC_IOREMAP 2022-06-27 12:22:31 +01:00
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: Implement misalignment fixups for multiword loads 2022-09-06 09:34:53 +01:00
cpu_errata.c arm64: errata: Add Cortex-A55 to the repeat tlbi list 2022-10-07 14:42:20 +01:00
cpu_ops.c
cpu-reset.S arm64: Add types to indirect called assembly functions 2022-09-26 10:13:13 -07:00
cpufeature.c arm64: cpufeature: Fix the visibility of compat hwcaps 2022-11-03 18:04:56 +00:00
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/sysreg: Add _EL1 into ID_AA64DFR0_EL1 definition names 2022-09-16 12:38:57 +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 arm64: efi: Recover from synchronous exceptions occurring in firmware 2022-11-03 18:01:15 +01:00
efi.c arm64: efi: Recover from synchronous exceptions occurring in firmware 2022-11-03 18:01:15 +01:00
elfcore.c arm64: Change elfcore for_each_mte_vma() to use VMA iterator 2022-09-26 19:46:19 -07:00
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 ftrace,kcfi: Separate ftrace_stub() and ftrace_stub_graph() 2022-10-20 17:10:27 +02:00
entry.S arm64: alternatives: have callbacks take a cap 2022-09-16 17:15:03 +01:00
fpsimd.c arm64/sme: Don't flush SVE register state when handling SME traps 2022-08-23 11:29:12 +01:00
ftrace.c arm64 updates for 6.1: 2022-10-06 11:51:49 -07:00
head.S arm64 updates for 6.1: 2022-10-06 11:51:49 -07:00
hibernate-asm.S arm64: kexec: install a copy of the linear-map 2021-10-01 13:31:00 +01:00
hibernate.c arm64: kasan: Revert "arm64: mte: reset the page tag in page->flags" 2022-07-07 10:48:37 +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 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
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: Treat ESR_ELx as a 64-bit register 2022-04-29 19:26:27 +01:00
kuser32.S arm64: compat: Move kuser32.S to .rodata section 2022-06-23 16:01:42 +01:00
machine_kexec_file.c arm64/kexec: Fix missing extra range for crashkres_low. 2022-09-01 11:50:00 +01:00
machine_kexec.c treewide: Drop function_nocfi 2022-09-26 10:13:14 -07:00
Makefile Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
module-plts.c arm64: module: Make plt_equals_entry() static 2022-09-29 17:47:18 +01:00
module.c arm64: module: move find_section to header 2022-09-09 12:27:25 +01:00
mte.c arm64: mte: Avoid setting PG_mte_tagged if no tags cleared or restored 2022-10-12 10:00:19 +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 updates for 6.1: 2022-10-06 11:51:49 -07:00
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: stacktrace: move SDEI stack helpers to stacktrace code 2022-09-09 12:30:07 +01:00
setup.c arm64: fix KASAN_INLINE 2022-07-20 16:08:10 +01:00
signal32.c signal: Deliver SIGTRAP on perf event asynchronously if blocked 2022-04-22 12:14:05 +02:00
signal.c arm64/sme: Don't flush SVE register state when allocating SME storage 2022-08-23 11:29:11 +01:00
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_spin_table.c treewide: Drop function_nocfi 2022-09-26 10:13:14 -07:00
smp.c profile: setup_profiling_timer() is moslty not implemented 2022-07-29 18:12:36 -07:00
stacktrace.c arm64: Prohibit instrumentation on arch_stack_walk() 2022-12-05 14:20:08 +00:00
suspend.c arm64: mte: move register initialization to C 2022-09-22 18:02:50 +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 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
traps.c arm64 updates for 6.1: 2022-10-06 11:51:49 -07:00
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 - Yu Zhao's Multi-Gen LRU patches are here. They've been under test in 2022-10-10 17:53:04 -07:00
vmlinux.lds.S Merge branch 'for-next/boot' into for-next/core 2022-07-25 10:59:15 +01:00