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linux/arch/x86/kernel
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Josh Poimboeuf 0ee1dd9f5e x86/dumpstack: Remove raw stack dump 
For mostly historical reasons, the x86 oops dump shows the raw stack
values:

  ...
  [registers]
  Stack:
   ffff880079af7350 ffff880079905400 0000000000000000 ffffc900008f3ae0
   ffffffffa0196610 0000000000000001 00010000ffffffff 0000000087654321
   0000000000000002 0000000000000000 0000000000000000 0000000000000000
  Call Trace:
  ...

This seems to be an artifact from long ago, and probably isn't needed
anymore.  It generally just adds noise to the dump, and it can be
actively harmful because it leaks kernel addresses.

Linus says:

  "The stack dump actually goes back to forever, and it used to be
   useful back in 1992 or so. But it used to be useful mainly because
   stacks were simpler and we didn't have very good call traces anyway. I
   definitely remember having used them - I just do not remember having
   used them in the last ten+ years.

   Of course, it's still true that if you can trigger an oops, you've
   likely already lost the security game, but since the stack dump is so
   useless, let's aim to just remove it and make games like the above
   harder."

This also removes the related 'kstack=' cmdline option and the
'kstack_depth_to_print' sysctl.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/e83bd50df52d8fe88e94d2566426ae40d813bf8f.1477405374.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-10-25 18:40:37 +02:00
..
acpi Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-10-10 10:59:07 -07:00
apic Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-10-10 10:59:07 -07:00
cpu x86/vmware: Skip lapic calibration on VMware 2016-10-05 11:43:30 +02:00
fpu Merge branch 'mm-pkeys-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-10-10 11:01:51 -07:00
kprobes kprobes: Unpoison stack in jprobe_return() for KASAN 2016-10-16 11:02:31 +02:00
.gitignore
alternative.c x86/asm: Stop depending on ptrace.h in alternative.h 2016-04-29 11:56:40 +02:00
amd_gart_64.c dma-mapping: use unsigned long for dma_attrs 2016-08-04 08:50:07 -04:00
amd_nb.c Merge branch 'x86-headers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-08-01 14:23:42 -04:00
apb_timer.c x86/apb_timer: Convert to hotplug state machine 2016-07-15 10:40:22 +02:00
aperture_64.c param: convert some "on"/"off" users to strtobool 2016-03-17 15:09:34 -07:00
apm_32.c x86/apm32: Remove paravirt_enabled() use 2016-04-22 10:29:03 +02:00
asm-offsets_32.c sched/x86: Rewrite the switch_to() code 2016-08-24 12:31:41 +02:00
asm-offsets_64.c sched/x86: Rewrite the switch_to() code 2016-08-24 12:31:41 +02:00
asm-offsets.c x86: Move thread_info into task_struct 2016-09-15 08:25:13 +02:00
audit_64.c
bootflag.c
check.c Linux 4.2-rc8 2015-08-25 09:59:19 +02:00
cpuid.c new helpers: no_seek_end_llseek{,_size}() 2015-12-23 10:41:31 -05:00
crash_dump_32.c
crash_dump_64.c
crash.c x86/panic: replace smp_send_stop() with kdump friendly version in panic path 2016-10-11 15:06:32 -07:00
devicetree.c x86/cpufeature: Replace cpu_has_apic with boot_cpu_has() usage 2016-04-13 11:37:41 +02:00
doublefault.c
dumpstack_32.c x86/dumpstack: Remove raw stack dump 2016-10-25 18:40:37 +02:00
dumpstack_64.c x86/dumpstack: Remove raw stack dump 2016-10-25 18:40:37 +02:00
dumpstack.c x86/dumpstack: Remove raw stack dump 2016-10-25 18:40:37 +02:00
e820.c x86/e820: Don't merge consecutive E820_PRAM ranges 2016-10-16 11:16:48 +02:00
early_printk.c x86: Fix misspellings in comments 2016-02-24 08:44:58 +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
ebda.c x86/boot: Simplify EBDA-vs-BIOS reservation logic 2016-07-22 11:46:01 +02:00
espfix_64.c x86: get rid of superfluous __GFP_REPEAT 2016-06-24 17:23:52 -07:00
ftrace.c ftrace/x86: Implement HAVE_FUNCTION_GRAPH_RET_ADDR_PTR 2016-08-24 12:15:15 +02:00
head32.c x86/boot: Run reserve_bios_regions() after we initialize the memory map 2016-08-11 11:14:59 +02:00
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: Fix the end of the stack for idle tasks 2016-10-20 09:15:23 +02:00
head_64.S x86/boot: Fix the end of the stack for idle tasks 2016-10-20 09:15:23 +02:00
hpet.c x86/hpet: Reduce HPET counter read contention 2016-09-09 15:16:19 +02:00
hw_breakpoint.c x86/kernel: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:41 +02:00
i8237.c
i8253.c x86/kernel: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:41 +02:00
i8259.c x86/irq: Probe for PIC presence before allocating descs for legacy IRQs 2015-11-07 10:37:37 +01:00
io_delay.c x86/kernel: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:41 +02:00
ioport.c x86/iopl: Fix iopl capability check on Xen PV 2016-03-17 09:49:27 +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 x86: Move thread_info into task_struct 2016-09-15 08:25:13 +02:00
irq_work.c treewide: Remove old email address 2015-11-23 09:44:58 +01:00
irq.c x86/irq: Do not substract irq_tlb_count from irq_call_count 2016-08-11 11:14:59 +02:00
irqinit.c x86/irq: Store irq descriptor in vector array 2015-08-06 00:14:59 +02:00
jump_label.c x86/asm: Stop depending on ptrace.h in alternative.h 2016-04-29 11:56:40 +02:00
kdebugfs.c x86/kernel: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:41 +02:00
kexec-bzimage64.c x86/e820: Prepare e280 code for switch to dynamic storage 2016-09-21 15:02:12 +02:00
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 Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-10-03 19:43:08 -07:00
kvmclock.c Merge branch 'linus' into x86/asm, to pick up recent fixes 2016-09-15 08:24:53 +02:00
ldt.c x86/mm: Factor out LDT init from context init 2016-02-18 19:46:31 +01:00
livepatch.c livepatch/x86: apply alternatives and paravirt patches after relocations 2016-08-18 23:41:55 +02:00
machine_kexec_32.c
machine_kexec_64.c kdump, vmcoreinfo: report memory sections virtual addresses 2016-10-11 15:06:33 -07:00
Makefile Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2016-10-14 14:26:58 -07:00
mcount_64.S x86: move exports to actual definitions 2016-08-07 23:47:15 -04:00
mmconf-fam10h_64.c
module.c x86/asm: Stop depending on ptrace.h in alternative.h 2016-04-29 11:56:40 +02:00
mpparse.c x86/mm/numa: Open code function early_get_boot_cpu_id() 2016-08-15 08:51:54 +02:00
msr.c x86/cpufeature: Carve out X86_FEATURE_* 2016-01-30 11:22:17 +01:00
nmi_selftest.c
nmi.c x86: include linux/ratelimit.h in nmi.c 2016-06-06 17:10:15 +02:00
paravirt_patch_32.c x86, locking/spinlocks: Remove ticket (spin)lock implementation 2016-09-30 10:56:00 +02:00
paravirt_patch_64.c x86, locking/spinlocks: Remove ticket (spin)lock implementation 2016-09-30 10:56:00 +02:00
paravirt-spinlocks.c x86, locking/spinlocks: Remove ticket (spin)lock implementation 2016-09-30 10:56:00 +02:00
paravirt.c x86/asm: Get rid of __read_cr4_safe() 2016-09-30 12:40:12 +02:00
pci-calgary_64.c dma-mapping: use unsigned long for dma_attrs 2016-08-04 08:50:07 -04:00
pci-dma.c dma-mapping: use unsigned long for dma_attrs 2016-08-04 08:50:07 -04:00
pci-iommu_table.c x86: Fix non-static inlines 2016-04-16 13:21:40 +02:00
pci-nommu.c dma-mapping: use unsigned long for dma_attrs 2016-08-04 08:50:07 -04:00
pci-swiotlb.c dma-mapping: use unsigned long for dma_attrs 2016-08-04 08:50:07 -04:00
pcspeaker.c
perf_regs.c
platform-quirks.c x86/boot: Reorganize and clean up the BIOS area reservation code 2016-07-21 10:11:57 +02:00
pmem.c x86/kernel: Audit and remove any unnecessary uses of module.h 2016-07-14 15:06:41 +02:00
probe_roms.c
process_32.c x86/dumpstack: Remove kernel text addresses from stack dump 2016-10-25 18:40:37 +02:00
process_64.c x86/dumpstack: Remove kernel text addresses from stack dump 2016-10-25 18:40:37 +02:00
process.c x86: use simpler API for random address requests 2016-10-11 15:06:32 -07:00
ptrace.c Merge branch 'x86-vdso-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-10-03 17:29:01 -07:00
pvclock.c KVM: x86: introduce get_kvmclock_ns 2016-09-20 09:26:15 +02:00
quirks.c x86/mce: Add PCI quirks to identify Xeons with machine check recovery 2016-09-05 11:47:31 +02:00
reboot_fixups_32.c
reboot.c x86: Apply more __ro_after_init and const 2016-08-10 14:55:05 +02:00
relocate_kernel_32.S
relocate_kernel_64.S
resource.c x86/e820: Prepare e280 code for switch to dynamic storage 2016-09-21 15:02:12 +02:00
rtc.c char/genrtc: x86: remove remnants of asm/rtc.h 2016-06-04 00:20:07 +02:00
setup_percpu.c Merge branch 'x86/mm' into x86/asm, to unify the two branches for simplicity 2016-09-08 08:41:52 +02:00
setup.c Merge branch 'x86-boot-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-10-03 16:46:53 -07:00
signal_compat.c x86/signal: Add SA_{X32,IA32}_ABI sa_flags 2016-09-14 21:28:11 +02:00
signal.c Merge branch 'x86-vdso-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-10-03 17:29:01 -07:00
smp.c Linux 4.9-rc1 2016-10-16 11:31:39 +02:00
smpboot.c x86/boot/smp/32: Fix initial idle stack location on 32-bit kernels 2016-10-20 09:15:23 +02:00
stacktrace.c x86/stacktrace: Convert save_stack_trace_*() to use the new unwinder 2016-09-20 08:29:33 +02:00
step.c mm: replace access_process_vm() write parameter with gup_flags 2016-10-19 08:31:25 -07:00
sys_x86_64.c x86: use simpler API for random address requests 2016-10-11 15:06:32 -07:00
sysfb_efi.c Merge branch 'linus' into efi/core, to pick up fixes 2016-05-07 07:00:07 +02:00
sysfb_simplefb.c
sysfb.c
tboot.c x86/e820: Prepare e280 code for switch to dynamic storage 2016-09-21 15:02:12 +02:00
tce_64.c x86/cpufeature: Remove cpu_has_clflush 2016-03-31 13:35:09 +02:00
test_nx.c x86/mm: Always enable CONFIG_DEBUG_RODATA and remove the Kconfig option 2016-02-22 08:51:38 +01:00
test_rodata.c x86: Don't use module.h just for AUTHOR / LICENSE tags 2016-07-14 13:04:20 +02:00
time.c
tls.c x86/tls: Synchronize segment registers in set_thread_area() 2016-04-29 11:56:42 +02:00
tls.h
topology.c
trace_clock.c
tracepoint.c
traps.c x86/mm: Improve stack-overflow #PF handling 2016-09-08 08:47:20 +02:00
tsc_msr.c x86/tsc_msr: Remove irqoff around MSR-based TSC enumeration 2016-07-11 21:30:12 +02:00
tsc_sync.c
tsc.c x86/tsc: Add additional Intel CPU models to the crystal quirk list 2016-09-20 01:00:32 +02:00
unwind_frame.c x86/unwind: Create stack frames for saved syscall registers 2016-10-21 09:26:04 +02:00
unwind_guess.c x86/unwind: Fix oprofile module link error 2016-10-06 09:52:20 +02:00
uprobes.c uprobes/x86: Fix RIP-relative handling of EVEX-encoded instructions 2016-08-12 08:29:24 +02:00
verify_cpu.S x86/cpufeature: Carve out X86_FEATURE_* 2016-01-30 11:22:17 +01:00
vm86_32.c x86, bitops: remove use of "sbb" to return CF 2016-06-08 12:41:20 -07:00
vmlinux.lds.S x86/boot: Move the _stext marker to before the boot code 2016-10-20 09:15:24 +02:00
vsmp_64.c
x86_init.c x86: Apply more __ro_after_init and const 2016-08-10 14:55:05 +02:00