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Josh Poimboeuf b08418b548 x86/unwind: Prevent false warnings for non-current tasks 
There's some daring kernel code out there which dumps the stack of
another task without first making sure the task is inactive.  If the
task happens to be running while the unwinder is reading the stack,
unusual unwinder warnings can result.

There's no race-free way for the unwinder to know whether such a warning
is legitimate, so just disable unwinder warnings for all non-current
tasks.

Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Dave Jones <dsj@fb.com>
Cc: Jann Horn <jannh@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Link: https://lore.kernel.org/r/ec424a2aea1d461eb30cab48a28c6433de2ab784.1587808742.git.jpoimboe@redhat.com
2020-04-25 12:22:28 +02:00
..
acpi
ACPI, x86/boot: make acpi_nobgrt static
2020-04-08 14:32:03 +02:00
apic
Updates for the interrupt subsystem:
2020-03-30 17:35:14 -07:00
cpu
A set of fixes for x86 and objtool:
2020-04-19 11:58:32 -07:00
fpu
x86/pkeys: Add check for pkey "overflow"
2020-02-24 20:25:21 +01:00
kprobes
x86/optprobe: Fix OPTPROBE vs UACCESS
2020-03-20 13:06:22 +01:00
.gitignore
.gitignore: add SPDX License Identifier
2020-03-25 11:50:48 +01:00
alternative.c
x86/alternatives: Mark text_poke_loc_init() static
2020-03-25 12:42:35 +01:00
amd_gart_64.c
x86/mm: thread pgprot_t through init_memory_mapping()
2020-04-10 15:36:21 -07:00
amd_nb.c
x86/amd_nb, char/amd64-agp: Use amd_nb_num() accessor
2020-03-17 10:25:58 +01:00
apb_timer.c
remove ioremap_nocache and devm_ioremap_nocache
2020-01-06 09:45:59 +01:00
aperture_64.c
x86/gart: Exclude GART aperture from kcore
2019-03-23 12:11:49 +01:00
apm_32.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 118
2019-05-24 17:39:02 +02:00
asm-offsets_32.c
x86 entry code updates:
2020-03-30 19:14:28 -07:00
asm-offsets_64.c
x86/entry: Move max syscall number calculation to syscallhdr.sh
2020-03-21 16:03:21 +01:00
asm-offsets.c
efi/x86: Avoid using code32_start
2020-03-08 09:58:17 +01:00
audit_64.c
…
bootflag.c
…
check.c
…
cpuid.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 142
2019-05-30 11:25:17 -07:00
crash_core_32.c
x86/crash: Define arch_crash_save_vmcoreinfo() if CONFIG_CRASH_CORE=y
2019-12-23 12:58:41 +01:00
crash_core_64.c
x86/crash: Define arch_crash_save_vmcoreinfo() if CONFIG_CRASH_CORE=y
2019-12-23 12:58:41 +01:00
crash_dump_32.c
…
crash_dump_64.c
fs/core/vmcore: Move sev_active() reference to x86 arch code
2019-08-09 22:52:10 +10:00
crash.c
x86/crash: Use resource_size()
2020-01-09 14:40:03 +01:00
devicetree.c
…
doublefault_32.c
x86/doublefault/32: Rewrite the x86_32 #DF handler and unify with 64-bit
2019-11-26 22:00:04 +01:00
dumpstack_32.c
x86/doublefault/32: Move #DF stack and TSS to cpu_entry_area
2019-11-26 21:53:34 +01:00
dumpstack_64.c
x86/unwind: Prevent false warnings for non-current tasks
2020-04-25 12:22:28 +02:00
dumpstack.c
x86/kasan: Print original address on #GP
2019-12-31 13:15:38 +01:00
e820.c
ACPI updates for 5.5-rc1
2019-11-26 19:25:25 -08:00
early_printk.c
efi/x86: Convert x86 EFI earlyprintk into generic earlycon implementation
2019-02-04 08:27:30 +01:00
early-quirks.c
x86/intel: Disable HPET on Intel Ice Lake platforms
2019-11-29 12:17:58 +01:00
ebda.c
…
eisa.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 243
2019-06-19 17:09:07 +02:00
espfix_64.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 288
2019-06-05 17:36:37 +02:00
ftrace_32.S
x86/ftrace: Get rid of function_hook
2019-10-25 10:52:22 +02:00
ftrace_64.S
New tracing features:
2019-11-27 11:42:01 -08:00
ftrace.c
Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2020-01-28 09:44:15 -08:00
head32.c
…
head64.c
x86/boot/64: Make level2_kernel_pgt pages invalid outside kernel area
2019-10-11 18:38:15 +02:00
head_32.S
x86/boot: Remove KEEP_SEGMENTS support
2020-02-22 23:37:37 +01:00
head_64.S
x86/asm/64: Change all ENTRY+END to SYM_CODE_*
2019-10-18 11:58:26 +02:00
hpet.c
remove ioremap_nocache and devm_ioremap_nocache
2020-01-06 09:45:59 +01:00
hw_breakpoint.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156
2019-05-30 11:26:35 -07:00
i8237.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
i8253.c
x86/timer: Skip PIT initialization on modern chipsets
2019-06-29 11:35:35 +02:00
i8259.c
…
idt.c
Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2019-07-08 11:22:57 -07:00
ima_arch.c
EFI updates for v5.7:
2020-02-26 15:21:22 +01:00
io_delay.c
x86/io_delay: Define IO_DELAY macros in C instead of Kconfig
2019-05-24 08:46:06 +02:00
ioport.c
x86/iopl: Include prototype header for ksys_ioperm()
2020-02-17 16:36:53 +01:00
irq_32.c
x86/irq: Move IS_ERR_OR_NULL() check into common do_IRQ() code
2019-08-19 23:19:06 +02:00
irq_64.c
x86/irq: Move IS_ERR_OR_NULL() check into common do_IRQ() code
2019-08-19 23:19:06 +02:00
irq_work.c
…
irq.c
x86/irq: Remove useless return value from do_IRQ()
2020-02-27 14:48:40 +01:00
irqflags.S
x86/asm: Change all ENTRY+ENDPROC to SYM_FUNC_*
2019-10-18 11:58:33 +02:00
irqinit.c
x86: Replace setup_irq() by request_irq()
2020-03-21 15:15:47 +01:00
itmt.c
proc/sysctl: add shared variables for range check
2019-07-18 17:08:07 -07:00
jailhouse.c
x86/jailhouse: Only enable platform UARTs if available
2019-10-10 15:43:59 +02:00
jump_label.c
x86/jump_label: Move 'inline' keyword placement
2020-03-27 11:05:41 +01:00
kdebugfs.c
x86/boot: Introduce setup_indirect
2019-11-12 16:21:15 +01:00
kexec-bzimage64.c
efi/x86: Make fw_vendor, config_table and runtime sysfs nodes x86 specific
2020-02-23 21:59:42 +01:00
kgdb.c
x86/apic: Provide and use helper for send_IPI_allbutself()
2019-07-25 16:12:00 +02:00
ksysfs.c
x86/boot: Introduce setup_indirect
2019-11-12 16:21:15 +01:00
kvm.c
KVM: Pre-allocate 1 cpumask variable per cpu for both pv tlb and pv ipis
2020-02-28 10:34:25 +01:00
kvmclock.c
x86/vdso: Use generic VDSO clock mode storage
2020-02-17 14:40:23 +01:00
ldt.c
x86: Remove unneeded includes
2020-03-21 16:03:25 +01:00
livepatch.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13
2019-05-21 11:28:45 +02:00
machine_kexec_32.c
x86/crash: Define arch_crash_save_vmcoreinfo() if CONFIG_CRASH_CORE=y
2019-12-23 12:58:41 +01:00
machine_kexec_64.c
x86/crash: Define arch_crash_save_vmcoreinfo() if CONFIG_CRASH_CORE=y
2019-12-23 12:58:41 +01:00
Makefile
Merge branch 'next-integrity' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity
2020-04-02 14:49:46 -07:00
mmconf-fam10h_64.c
…
module.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156
2019-05-30 11:26:35 -07:00
mpparse.c
x86/boot: Fix memory leak in default_get_smp_config()
2019-07-16 23:13:48 +02:00
msr.c
x86/msr: Restrict MSR access when the kernel is locked down
2019-08-19 21:54:16 -07:00
nmi_selftest.c
…
nmi.c
x86: Fix a handful of typos
2020-02-16 20:58:06 +01:00
paravirt_patch.c
x86/paravirt: Standardize 'insn_buff' variable names
2019-04-29 16:05:49 +02:00
paravirt-spinlocks.c
…
paravirt.c
x86/ioperm: Add new paravirt function update_io_bitmap()
2020-02-29 12:43:09 +01:00
pci-dma.c
dma-mapping updates for 5.5-rc1
2019-11-28 11:16:43 -08:00
pci-iommu_table.c
…
pci-swiotlb.c
dma-mapping: fix filename references
2019-09-03 08:36:30 +02:00
pcspeaker.c
…
perf_regs.c
perf/x86/regs: Check reserved bits
2019-06-24 19:19:24 +02:00
platform-quirks.c
…
pmem.c
…
probe_roms.c
…
process_32.c
x86: Remove unneeded includes
2020-03-21 16:03:25 +01:00
process_64.c
x86: Remove unneeded includes
2020-03-21 16:03:25 +01:00
process.c
Support for "split lock" detection:
2020-03-30 19:35:52 -07:00
process.h
x86: Use the correct SPDX License Identifier in headers
2019-10-01 20:31:35 +02:00
ptrace.c
x86/ptrace: Document FSBASE and GSBASE ABI oddities
2019-11-26 22:00:12 +01:00
pvclock.c
x86/vdso: Use generic VDSO clock mode storage
2020-02-17 14:40:23 +01:00
quirks.c
remove ioremap_nocache and devm_ioremap_nocache
2020-01-06 09:45:59 +01:00
reboot_fixups_32.c
…
reboot.c
x86: Fix a handful of typos
2020-02-16 20:58:06 +01:00
relocate_kernel_32.S
x86/asm: Annotate relocate_kernel_{32,64}.c
2019-10-18 09:53:19 +02:00
relocate_kernel_64.S
x86/kexec: Make relocate_kernel_64.S objtool clean
2020-03-25 18:28:28 +01:00
resource.c
…
rtc.c
…
setup_percpu.c
x86: Use pr_warn instead of pr_warning
2019-10-18 15:00:18 +02:00
setup.c
mm: hugetlb: optionally allocate gigantic hugepages using cma
2020-04-10 15:36:21 -07:00
signal_compat.c
…
signal.c
Merge branch 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2020-03-31 11:04:05 -07:00
smp.c
x86/smp: Move smp_function_call implementations into IPI code
2019-07-25 16:12:01 +02:00
smpboot.c
Merge branch 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2020-03-31 11:04:05 -07:00
stacktrace.c
x86 user stack frame reads: switch to explicit __get_user()
2020-02-15 17:26:26 -05:00
step.c
…
sys_ia32.c
x86/entry/32: Use IA32-specific wrappers for syscalls taking 64-bit arguments
2020-03-21 16:03:24 +01:00
sys_x86_64.c
x86: Remove unneeded includes
2020-03-21 16:03:25 +01:00
sysfb_efi.c
x86/sysfb_efi: Add quirks for some devices with swapped width and height
2019-07-22 10:47:11 +02:00
sysfb_simplefb.c
x86/sysfb: Fix check for bad VRAM size
2020-01-20 10:57:53 +01:00
sysfb.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
tboot.c
remove ioremap_nocache and devm_ioremap_nocache
2020-01-06 09:45:59 +01:00
time.c
Merge branch 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2020-03-31 11:04:05 -07:00
tls.c
x86/tls: Fix possible spectre-v1 in do_get_thread_area()
2019-06-27 23:48:04 +02:00
tls.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 193
2019-05-30 11:29:21 -07:00
topology.c
x86/smp: Replace cpu_up/down() with add/remove_cpu()
2020-03-25 12:59:35 +01:00
trace_clock.c
…
tracepoint.c
…
traps.c
Support for "split lock" detection:
2020-03-30 19:35:52 -07:00
tsc_msr.c
x86 timer updates:
2020-03-30 19:55:39 -07:00
tsc_sync.c
x86: Fix a handful of typos
2020-02-16 20:58:06 +01:00
tsc.c
Merge branch 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2020-03-31 11:04:05 -07:00
umip.c
x86/umip: Make umip_insns static
2020-04-15 11:13:12 +02:00
unwind_frame.c
x86/unwind: Prevent false warnings for non-current tasks
2020-04-25 12:22:28 +02:00
unwind_guess.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
unwind_orc.c
x86/unwind: Prevent false warnings for non-current tasks
2020-04-25 12:22:28 +02:00
uprobes.c
x86/apic, x86/uprobes: Correct parameter names in kernel-doc comments
2019-10-27 09:00:28 +01:00
verify_cpu.S
x86/asm: Annotate local pseudo-functions
2019-10-18 10:04:04 +02:00
vm86_32.c
x86: switch save_v86_state() to unsafe_put_user()
2020-03-18 20:36:01 -04:00
vmlinux.lds.S
Merge branch 'x86-build-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2020-03-31 10:51:12 -07:00
vsmp_64.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 346
2019-06-05 17:37:08 +02:00
x86_init.c
A set of fixes for X86:
2020-02-09 12:11:12 -08:00