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Josh Poimboeuf af085d9084 stacktrace/x86: add function for detecting reliable stack traces 
For live patching and possibly other use cases, a stack trace is only
useful if it can be assured that it's completely reliable.  Add a new
save_stack_trace_tsk_reliable() function to achieve that.

Note that if the target task isn't the current task, and the target task
is allowed to run, then it could be writing the stack while the unwinder
is reading it, resulting in possible corruption.  So the caller of
save_stack_trace_tsk_reliable() must ensure that the task is either
'current' or inactive.

save_stack_trace_tsk_reliable() relies on the x86 unwinder's detection
of pt_regs on the stack.  If the pt_regs are not user-mode registers
from a syscall, then they indicate an in-kernel interrupt or exception
(e.g. preemption or a page fault), in which case the stack is considered
unreliable due to the nature of frame pointers.

It also relies on the x86 unwinder's detection of other issues, such as:

- corrupted stack data
- stack grows the wrong way
- stack walk doesn't reach the bottom
- user didn't provide a large enough entries array

Such issues are reported by checking unwind_error() and !unwind_done().

Also add CONFIG_HAVE_RELIABLE_STACKTRACE so arch-independent code can
determine at build time whether the function is implemented.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Acked-by: Ingo Molnar <mingo@kernel.org>	# for the x86 changes
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
 		2017-03-08 09:18:02 +01:00
..
acpi ACPI updates for v4.11-rc1 2017-02-20 17:55:15 -08:00
apic Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-02-28 11:46:00 -08:00
cpu sched/headers: Move task->mm handling methods to <linux/sched/mm.h> 2017-03-03 01:43:28 +01:00
fpu sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
kprobes sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h> 2017-03-02 08:42:34 +01:00
.gitignore
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Makefile mm: add arch-independent testcases for RODATA 2017-02-27 18:43:48 -08:00
alternative.c x86/alternatives: Do not use sync_core() to serialize I$ 2016-12-20 09:36:42 +01:00
amd_gart_64.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h> 2017-03-02 08:42:34 +01:00
amd_nb.c x86/amd_nb: Add SMN and Indirect Data Fabric access for AMD Fam17h 2016-11-16 20:46:38 +01:00
apb_timer.c Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-12-25 14:30:04 -08:00
aperture_64.c
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apm_32.c sched/headers: Prepare to move cputime functionality from <linux/sched.h> into <linux/sched/cputime.h> 2017-03-02 08:42:39 +01:00
asm-offsets.c efi: Get and store the secure boot status 2017-02-07 10:42:10 +01:00
asm-offsets_32.c sched/x86: Rewrite the switch_to() code 2016-08-24 12:31:41 +02:00
asm-offsets_64.c x86/kvm: Provide optimized version of vcpu_is_preempted() for x86-64 2017-02-21 12:48:35 +01:00
audit_64.c
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bootflag.c
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check.c
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cpuid.c Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-12-12 19:25:04 -08:00
crash.c kexec_file: Change kexec_add_buffer to take kexec_buf as argument. 2016-11-30 23:14:59 +11:00
crash_dump_32.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
crash_dump_64.c
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devicetree.c
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doublefault.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h> 2017-03-02 08:42:34 +01:00
dumpstack.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
dumpstack_32.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h> 2017-03-02 08:42:34 +01:00
dumpstack_64.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h> 2017-03-02 08:42:34 +01:00
e820.c x86/e820/32: Fix e820_search_gap() error handling on x86-32 2017-01-12 09:40:06 +01:00
early-quirks.c Merge tag 'drm-for-v4.9' of git://people.freedesktop.org/~airlied/linux 2016-10-11 18:12:22 -07:00
early_printk.c
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ebda.c x86/boot: Simplify EBDA-vs-BIOS reservation logic 2016-07-22 11:46:01 +02:00
espfix_64.c
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ftrace.c ftrace/x86: Implement HAVE_FUNCTION_GRAPH_RET_ADDR_PTR 2016-08-24 12:15:15 +02:00
head32.c x86/boot/32: Convert the 32-bit pgtable setup code from assembly to C 2017-01-06 08:39:26 +01:00
head64.c x86/boot: Run reserve_bios_regions() after we initialize the memory map 2016-08-11 11:14:59 +02:00
head_32.S x86/boot/32: Convert the 32-bit pgtable setup code from assembly to C 2017-01-06 08:39:26 +01:00
head_64.S x86/boot/64: Push correct start_cpu() return address 2016-12-14 08:48:05 +01:00
hpet.c x86/irq: Make irq activate operations symmetric 2017-01-31 20:22:18 +01:00
hw_breakpoint.c x86/kernel: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:41 +02:00
i8237.c
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i8253.c x86/kernel: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:41 +02:00
i8259.c
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io_delay.c x86/kernel: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:41 +02:00
ioport.c Second batch of KVM changes for 4.11 merge window 2017-03-04 11:36:19 -08:00
irq.c x86/irq, trace: Add __irq_entry annotation to x86's platform IRQ handlers 2017-01-05 08:58:49 +01:00
irq_32.c x86/kernel: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:41 +02:00
irq_64.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
irq_work.c x86/irq, trace: Add __irq_entry annotation to x86's platform IRQ handlers 2017-01-05 08:58:49 +01:00
irqinit.c
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itmt.c sched/x86: Remove unnecessary TBM3 check to update topology 2017-01-19 08:42:37 +01:00
jump_label.c locking/jump_labels: Update bug_at() boot message 2017-01-12 09:43:07 +01:00
kdebugfs.c x86/kernel: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:41 +02:00
kexec-bzimage64.c kexec_file: Change kexec_add_buffer to take kexec_buf as argument. 2016-11-30 23:14:59 +11:00
kgdb.c sched/x86: Add 'struct inactive_task_frame' to better document the sleeping task stack frame 2016-08-24 12:27:41 +02:00
ksysfs.c x86: Apply more __ro_after_init and const 2016-08-10 14:55:05 +02:00
kvm.c 4.11 is going to be a relatively large release for KVM, with a little over 2017-02-22 18:22:53 -08:00
kvmclock.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/clock.h> 2017-03-02 08:42:27 +01:00
ldt.c Merge branch 'akpm' (patches from Andrew) 2016-12-12 20:50:02 -08:00
livepatch.c livepatch/x86: apply alternatives and paravirt patches after relocations 2016-08-18 23:41:55 +02:00
machine_kexec_32.c
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machine_kexec_64.c kexec: export the value of phys_base instead of symbol address 2016-12-14 16:04:07 -08:00
mcount_64.S x86: Fix export for mcount and __fentry__ 2016-10-26 12:38:17 +02:00
mmconf-fam10h_64.c
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module.c
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mpparse.c x86/mm/numa: Open code function early_get_boot_cpu_id() 2016-08-15 08:51:54 +02:00
msr.c x86/msr: Remove bogus cleanup from the error path 2016-12-25 10:47:41 +01:00
nmi.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h> 2017-03-02 08:42:34 +01:00
nmi_selftest.c
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paravirt-spinlocks.c 4.11 is going to be a relatively large release for KVM, with a little over 2017-02-22 18:22:53 -08:00
paravirt.c mm, x86: add support for PUD-sized transparent hugepages 2017-02-24 17:46:54 -08:00
paravirt_patch_32.c x86/paravirt: Mark unused patch_default label 2016-12-22 17:43:35 +01:00
paravirt_patch_64.c x86/paravirt: Mark unused patch_default label 2016-12-22 17:43:35 +01:00
pci-calgary_64.c This is a tree wide change and has been kept separate for that reason. 2017-02-25 13:45:43 -08:00
pci-dma.c This is a tree wide change and has been kept separate for that reason. 2017-02-25 13:45:43 -08:00
pci-iommu_table.c
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pci-nommu.c treewide: Constify most dma_map_ops structures 2017-01-24 12:23:35 -05:00
pci-swiotlb.c treewide: Constify most dma_map_ops structures 2017-01-24 12:23:35 -05:00
pcspeaker.c
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perf_regs.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
platform-quirks.c x86/init: Add i8042 state to the platform data 2016-12-19 11:34:15 +01:00
pmem.c x86/kernel: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:41 +02:00
probe_roms.c
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process.c Second batch of KVM changes for 4.11 merge window 2017-03-04 11:36:19 -08:00
process_32.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
process_64.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
ptrace.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
pvclock.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/nmi.h> 2017-03-02 08:42:30 +01:00
quirks.c x86/quirks: Hide maybe-uninitialized warning 2016-10-25 11:45:13 +02:00
reboot.c x86: Apply more __ro_after_init and const 2016-08-10 14:55:05 +02:00
reboot_fixups_32.c
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relocate_kernel_32.S
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relocate_kernel_64.S
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resource.c x86/e820: Prepare e280 code for switch to dynamic storage 2016-09-21 15:02:12 +02:00
rtc.c timekeeping: Ignore the bogus sleep time if pm_trace is enabled 2016-11-29 18:02:58 +01:00
setup.c Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-02-28 11:46:00 -08:00
setup_percpu.c x86/percpu: Remove unnecessary include of module.h, add asm/desc.h 2016-11-15 07:26:37 +01:00
signal.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
signal_compat.c x86/signal: Remove bogus user_64bit_mode() check from sigaction_compat_abi() 2016-10-20 13:05:15 +02:00
smp.c x86/irq, trace: Add __irq_entry annotation to x86's platform IRQ handlers 2017-01-05 08:58:49 +01:00
smpboot.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
stacktrace.c stacktrace/x86: add function for detecting reliable stack traces 2017-03-08 09:18:02 +01:00
step.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
sys_x86_64.c sched/headers: Prepare for new header dependencies before moving more code to <linux/sched/mm.h> 2017-03-02 08:42:30 +01:00
sysfb.c
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sysfb_efi.c
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sysfb_simplefb.c x86/sysfb: Fix lfb_size calculation 2016-11-16 09:38:23 +01:00
tboot.c cpu/hotplug: Cleanup state names 2016-12-25 10:47:44 +01:00
tce_64.c
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time.c
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tls.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
tls.h
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topology.c
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trace_clock.c
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tracepoint.c tracing: Have the reg function allow to fail 2016-12-09 09:13:30 -05:00
traps.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
tsc.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/clock.h> 2017-03-02 08:42:27 +01:00
tsc_msr.c x86/tsc: Set TSC_KNOWN_FREQ and TSC_RELIABLE flags on Intel Atom SoCs 2016-11-18 10:58:31 +01:00
tsc_sync.c x86/tsc: Make the TSC ADJUST sanitizing work for tsc_reliable 2017-02-10 09:47:17 +01:00
unwind_frame.c stacktrace/x86: add function for detecting reliable stack traces 2017-03-08 09:18:02 +01:00
unwind_guess.c x86/unwind: Fix guess-unwinder regression 2016-11-28 07:47:54 +01:00
uprobes.c uprobes/x86: Fix RIP-relative handling of EVEX-encoded instructions 2016-08-12 08:29:24 +02:00
verify_cpu.S
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vm86_32.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
vmlinux.lds.S objtool, modules: Discard objtool annotation sections for modules 2017-03-01 20:32:25 +01:00
vsmp_64.c
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x86_init.c x86/init: Remove i8042_detect() from platform ops 2016-12-19 11:34:15 +01:00