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Sasha Levin db08655437 x86/nmi: Fix use of unallocated cpumask_var_t 
Commit "x86/nmi: Perform a safe NMI stack trace on all CPUs" has introduced
a cpumask_var_t variable:

	+static cpumask_var_t printtrace_mask;

But never allocated it before using it, which caused a NULL ptr deref when
trying to print the stack trace:

[ 1110.296154] BUG: unable to handle kernel NULL pointer dereference at           (null)
[ 1110.296169] IP: __memcpy (arch/x86/lib/memcpy_64.S:151)
[ 1110.296178] PGD 4c34b3067 PUD 4c351b067 PMD 0
[ 1110.296186] Oops: 0002 [#1] PREEMPT SMP KASAN
[ 1110.296234] Dumping ftrace buffer:
[ 1110.296330]    (ftrace buffer empty)
[ 1110.296339] Modules linked in:
[ 1110.296345] CPU: 1 PID: 10538 Comm: trinity-c99 Not tainted 3.18.0-rc5-next-20141124-sasha-00058-ge2a8c09-dirty #1499
[ 1110.296348] task: ffff880152650000 ti: ffff8804c3560000 task.ti: ffff8804c3560000
[ 1110.296357] RIP: __memcpy (arch/x86/lib/memcpy_64.S:151)
[ 1110.296360] RSP: 0000:ffff8804c3563870  EFLAGS: 00010246
[ 1110.296363] RAX: 0000000000000000 RBX: ffffe8fff3c4a809 RCX: 0000000000000000
[ 1110.296366] RDX: 0000000000000008 RSI: ffffffff9e254040 RDI: 0000000000000000
[ 1110.296369] RBP: ffff8804c3563908 R08: 0000000000ffffff R09: 0000000000ffffff
[ 1110.296371] R10: 0000000000000000 R11: 0000000000000006 R12: 0000000000000000
[ 1110.296375] R13: 0000000000000000 R14: ffffffff9e254040 R15: ffffe8fff3c4a809
[ 1110.296379] FS:  00007f9e43b0b700(0000) GS:ffff880107e00000(0000) knlGS:0000000000000000
[ 1110.296382] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 1110.296385] CR2: 0000000000000000 CR3: 00000004e4334000 CR4: 00000000000006a0
[ 1110.296400] Stack:
[ 1110.296406]  ffffffff81b1e46c 0000000000000000 ffff880107e03fb8 000000000000000b
[ 1110.296413]  ffff880107dfffc0 ffff880107e03fc0 0000000000000008 ffffffff93f2e9c8
[ 1110.296419]  0000000000000000 ffffda0020fc07f7 0000000000000008 ffff8804c3563901
[ 1110.296420] Call Trace:
[ 1110.296429] ? memcpy (mm/kasan/kasan.c:275)
[ 1110.296437] ? arch_trigger_all_cpu_backtrace (include/linux/bitmap.h:215 include/linux/cpumask.h:506 arch/x86/kernel/apic/hw_nmi.c:76)
[ 1110.296444] arch_trigger_all_cpu_backtrace (include/linux/bitmap.h:215 include/linux/cpumask.h:506 arch/x86/kernel/apic/hw_nmi.c:76)
[ 1110.296451] ? dump_stack (./arch/x86/include/asm/preempt.h:95 lib/dump_stack.c:55)
[ 1110.296458] do_raw_spin_lock (./arch/x86/include/asm/spinlock.h:86 kernel/locking/spinlock_debug.c:130 kernel/locking/spinlock_debug.c:137)
[ 1110.296468] _raw_spin_lock (include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:151)
[ 1110.296474] ? __page_check_address (include/linux/spinlock.h:309 mm/rmap.c:630)
[ 1110.296481] __page_check_address (include/linux/spinlock.h:309 mm/rmap.c:630)
[ 1110.296487] ? preempt_count_sub (kernel/sched/core.c:2615)
[ 1110.296493] try_to_unmap_one (include/linux/rmap.h:202 mm/rmap.c:1146)
[ 1110.296504] ? anon_vma_interval_tree_iter_next (mm/interval_tree.c:72 mm/interval_tree.c:103)
[ 1110.296514] rmap_walk (mm/rmap.c:1653 mm/rmap.c:1725)
[ 1110.296521] ? page_get_anon_vma (include/linux/rcupdate.h:423 include/linux/rcupdate.h:935 mm/rmap.c:435)
[ 1110.296530] try_to_unmap (mm/rmap.c:1545)
[ 1110.296536] ? page_get_anon_vma (mm/rmap.c:437)
[ 1110.296545] ? try_to_unmap_nonlinear (mm/rmap.c:1138)
[ 1110.296551] ? SyS_msync (mm/rmap.c:1501)
[ 1110.296558] ? page_remove_rmap (mm/rmap.c:1409)
[ 1110.296565] ? page_get_anon_vma (mm/rmap.c:448)
[ 1110.296571] ? anon_vma_ctor (mm/rmap.c:1496)
[ 1110.296579] migrate_pages (mm/migrate.c:913 mm/migrate.c:956 mm/migrate.c:1136)
[ 1110.296586] ? _raw_spin_unlock_irq (./arch/x86/include/asm/preempt.h:95 include/linux/spinlock_api_smp.h:169 kernel/locking/spinlock.c:199)
[ 1110.296593] ? buffer_migrate_lock_buffers (mm/migrate.c:1584)
[ 1110.296601] ? handle_mm_fault (mm/memory.c:3163 mm/memory.c:3223 mm/memory.c:3336 mm/memory.c:3365)
[ 1110.296607] migrate_misplaced_page (mm/migrate.c:1738)
[ 1110.296614] handle_mm_fault (mm/memory.c:3170 mm/memory.c:3223 mm/memory.c:3336 mm/memory.c:3365)
[ 1110.296623] __do_page_fault (arch/x86/mm/fault.c:1246)
[ 1110.296630] ? vtime_account_user (kernel/sched/cputime.c:701)
[ 1110.296638] ? get_parent_ip (kernel/sched/core.c:2559)
[ 1110.296646] ? context_tracking_user_exit (kernel/context_tracking.c:144)
[ 1110.296656] trace_do_page_fault (arch/x86/mm/fault.c:1329 include/linux/jump_label.h:114 include/linux/context_tracking_state.h:27 include/linux/context_tracking.h:45 arch/x86/mm/fault.c:1330)
[ 1110.296664] do_async_page_fault (arch/x86/kernel/kvm.c:280)
[ 1110.296670] async_page_fault (arch/x86/kernel/entry_64.S:1285)
[ 1110.296755] Code: 08 4c 8b 54 16 f0 4c 8b 5c 16 f8 4c 89 07 4c 89 4f 08 4c 89 54 17 f0 4c 89 5c 17 f8 c3 90 83 fa 08 72 1b 4c 8b 06 4c 8b 4c 16 f8 <4c> 89 07 4c 89 4c 17 f8 c3 66 2e 0f 1f 84 00 00 00 00 00 83 fa
All code
========
   0:   08 4c 8b 54             or     %cl,0x54(%rbx,%rcx,4)
   4:   16                      (bad)
   5:   f0 4c 8b 5c 16 f8       lock mov -0x8(%rsi,%rdx,1),%r11
   b:   4c 89 07                mov    %r8,(%rdi)
   e:   4c 89 4f 08             mov    %r9,0x8(%rdi)
  12:   4c 89 54 17 f0          mov    %r10,-0x10(%rdi,%rdx,1)
  17:   4c 89 5c 17 f8          mov    %r11,-0x8(%rdi,%rdx,1)
  1c:   c3                      retq
  1d:   90                      nop
  1e:   83 fa 08                cmp    $0x8,%edx
  21:   72 1b                   jb     0x3e
  23:   4c 8b 06                mov    (%rsi),%r8
  26:   4c 8b 4c 16 f8          mov    -0x8(%rsi,%rdx,1),%r9
  2b:*  4c 89 07                mov    %r8,(%rdi)               <-- trapping instruction
  2e:   4c 89 4c 17 f8          mov    %r9,-0x8(%rdi,%rdx,1)
  33:   c3                      retq
  34:   66 2e 0f 1f 84 00 00    nopw   %cs:0x0(%rax,%rax,1)
  3b:   00 00 00
  3e:   83 fa 00                cmp    $0x0,%edx

Code starting with the faulting instruction
===========================================
   0:   4c 89 07                mov    %r8,(%rdi)
   3:   4c 89 4c 17 f8          mov    %r9,-0x8(%rdi,%rdx,1)
   8:   c3                      retq
   9:   66 2e 0f 1f 84 00 00    nopw   %cs:0x0(%rax,%rax,1)
  10:   00 00 00
  13:   83 fa 00                cmp    $0x0,%edx
[ 1110.296760] RIP __memcpy (arch/x86/lib/memcpy_64.S:151)
[ 1110.296763]  RSP <ffff8804c3563870>
[ 1110.296765] CR2: 0000000000000000

Link: http://lkml.kernel.org/r/1416931560-10603-1-git-send-email-sasha.levin@oracle.com

Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2014-11-25 14:15:30 -05:00
..
acpi
Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2014-08-13 18:23:32 -06:00
apic
x86/nmi: Fix use of unallocated cpumask_var_t
2014-11-25 14:15:30 -05:00
cpu
Merge branch 'for-3.18-consistent-ops' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
2014-10-15 07:48:18 +02:00
kprobes
kprobes/x86: Free 'optinsn' cache when range check fails
2014-08-27 20:24:32 +02:00
.gitignore
…
alternative.c
kprobes, x86: Allow kprobes on text_poke/hw_breakpoint
2014-04-24 10:03:02 +02:00
amd_gart_64.c
x86: enable DMA CMA with swiotlb
2014-06-04 16:53:57 -07:00
amd_nb.c
Merge tag 'edac_for_3.15' of git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp
2014-04-01 13:54:00 -07:00
apb_timer.c
x86: Replace __get_cpu_var uses
2014-08-26 13:45:49 -04:00
aperture_64.c
x86/gart: Tidy messages and add bridge device info
2014-05-23 10:47:19 -06:00
apm_32.c
x86: Remove unused variable "polling"
2014-07-16 12:58:47 +02:00
asm-offsets_32.c
x86: Get rid of ->hard_math and all the FPU asm fu
2013-06-06 14:32:04 -07:00
asm-offsets_64.c
x86, gdt, hibernate: Store/load GDT for hibernate path.
2013-05-02 11:27:35 -07:00
asm-offsets.c
sched, x86: Provide a per-cpu preempt_count implementation
2013-09-25 14:07:57 +02:00
audit_64.c
…
bootflag.c
…
check.c
x86/mm: memblock: switch to use NUMA_NO_NODE
2014-01-21 16:19:47 -08:00
cpuid.c
x86, cpuid: Fix CPU hotplug callback registration
2014-03-20 13:43:42 +01:00
crash_dump_32.c
…
crash_dump_64.c
…
crash.c
kexec: check if crashk_res_low exists when exclude it from crash mem ranges
2014-10-14 02:18:21 +02:00
devicetree.c
x86, irq, devicetree: Release IOAPIC pin when PCI device is disabled
2014-06-21 23:05:44 +02:00
doublefault.c
x86: Delete non-required instances of include <linux/init.h>
2014-01-06 21:25:18 -08:00
dumpstack_32.c
Merge branch 'x86-threadinfo-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2014-04-01 10:17:18 -07:00
dumpstack_64.c
x86: Fix dumpstack_64 irq stack handling
2014-04-02 11:46:50 -07:00
dumpstack.c
kprobes, x86: Use NOKPROBE_SYMBOL() instead of __kprobes annotation
2014-04-24 10:26:38 +02:00
e820.c
x86/mm, hibernate: Do not assume the first e820 area to be RAM
2014-09-16 09:54:31 +02:00
early_printk.c
Merge branch 'x86-intel-mid-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2013-11-12 11:12:22 +09:00
early-quirks.c
Merge commit '9e9a928eed8796a0a1aaed7e0b676db86ba84594' into drm-next
2014-06-05 20:28:59 +10:00
entry_32.S
Merge git://git.infradead.org/users/eparis/audit
2014-10-19 16:25:56 -07:00
entry_64.S
audit: x86: drop arch from __audit_syscall_entry() interface
2014-09-23 16:21:28 -04:00
espfix_64.c
x86/espfix/xen: Fix allocation of pages for paravirt page tables
2014-07-14 13:47:32 -07:00
ftrace.c
ftrace/x86/extable: Add is_ftrace_trampoline() function
2014-11-19 15:25:26 -05:00
head32.c
asmlinkage, x86: Add explicit __visible to arch/x86/*
2014-05-05 16:07:44 -07:00
head64.c
kernel/printk: use symbolic defines for console loglevels
2014-06-04 16:54:17 -07:00
head_32.S
x86: fix compile error due to X86_TRAP_NMI use in asm files
2014-03-07 18:58:40 -08:00
head_64.S
x86: fix compile error due to X86_TRAP_NMI use in asm files
2014-03-07 18:58:40 -08:00
head.c
x86: Make sure we can boot in the case the BDA contains pure garbage
2013-02-27 13:38:57 -08:00
hpet.c
Merge branch 'x86/vdso' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into next
2014-06-05 08:05:29 -07:00
hw_breakpoint.c
x86: Replace __get_cpu_var uses
2014-08-26 13:45:49 -04:00
i386_ksyms_32.c
sched, x86: Optimize the preempt_schedule() call
2013-09-25 14:23:07 +02:00
i387.c
x86/xsaves: Clear reserved bits in xsave header
2014-05-29 14:33:00 -07:00
i8237.c
…
i8253.c
…
i8259.c
x86, irq, pic: Probe for legacy PIC and set legacy_pic appropriately
2014-04-14 11:49:55 -07:00
io_delay.c
…
ioport.c
x86: get rid of pt_regs argument of iopl(2)
2013-02-03 18:16:24 -05:00
iosf_mbi.c
x86/platform/intel/iosf: Add debugfs config option for IOSF
2014-09-19 13:08:43 +02:00
irq_32.c
x86, threadinfo: Redo "x86: Use inline assembler to get sp"
2014-03-10 17:32:01 -07:00
irq_64.c
x86: Replace __get_cpu_var uses
2014-08-26 13:45:49 -04:00
irq_work.c
x86: Tell irq work about self IPI support
2014-09-13 18:38:29 +02:00
irq.c
Merge branch 'x86-irq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2014-06-12 20:03:47 -07:00
irqinit.c
x86: Fix non-PC platform kernel crash on boot due to NULL dereference
2014-08-25 22:36:57 +02:00
jump_label.c
x86/jump_label: expect default_nop if static_key gets enabled on boot-up
2013-10-19 19:45:35 -04:00
kdebugfs.c
arch/x86/kernel/kdebugfs.c: Ensure a consistent return value in error case
2012-07-26 15:07:20 +02:00
kexec-bzimage64.c
kexec-bzimage64: fix sparse warnings
2014-10-14 02:18:21 +02:00
kgdb.c
x86: Delete non-required instances of include <linux/init.h>
2014-01-06 21:25:18 -08:00
ksysfs.c
x86: ksysfs.c build fix
2014-01-03 14:37:13 +00:00
kvm.c
Merge branch 'for-3.18-consistent-ops' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
2014-10-15 07:48:18 +02:00
kvmclock.c
kvm: remove redundant registration of BSP's hv_clock area
2014-02-22 15:53:32 +01:00
ldt.c
Revert "x86-64, modify_ldt: Make support for 16-bit segments a runtime option"
2014-05-21 10:22:59 -07:00
machine_kexec_32.c
x86: Axe the lightly-used cpu_has_pae
2014-09-11 14:30:01 -07:00
machine_kexec_64.c
kexec: create a new config option CONFIG_KEXEC_FILE for new syscall
2014-08-29 16:28:16 -07:00
Makefile
x86: Speed up ___preempt_schedule*() by using THUNK helpers
2014-09-24 15:15:38 +02:00
mcount_64.S
ftrace/x86: Add frames pointers to trampoline as necessary
2014-11-19 15:24:31 -05:00
mmconf-fam10h_64.c
x86: delete __cpuinit usage from all x86 files
2013-07-14 19:36:56 -04:00
module.c
x86, kaslr: fix module lock ordering problem
2014-03-24 10:18:26 -07:00
mpparse.c
x86, apic: Remove mps_oem_check callback
2014-07-31 08:05:42 -07:00
msr.c
x86, msr: Fix CPU hotplug callback registration
2014-03-20 13:43:42 +01:00
nmi_selftest.c
…
nmi.c
kprobes, x86: Use NOKPROBE_SYMBOL() instead of __kprobes annotation
2014-04-24 10:26:38 +02:00
paravirt_patch_32.c
…
paravirt_patch_64.c
x86_64/entry/xen: Do not invoke espfix64 on Xen
2014-07-28 15:25:40 -07:00
paravirt-spinlocks.c
x86, ticketlock: Add slowpath logic
2013-08-09 07:54:00 -07:00
paravirt.c
kprobes, x86: Prohibit probing on native_set_debugreg()/load_idt()
2014-04-24 10:02:58 +02:00
pci-calgary_64.c
x86, calgary: Use 8M TCE table size by default
2014-04-10 19:51:32 -07:00
pci-dma.c
arch/x86/kernel/pci-dma.c: fix dma_generic_alloc_coherent() when CONFIG_DMA_CMA is enabled
2014-06-04 16:53:57 -07:00
pci-iommu_table.c
…
pci-nommu.c
x86: Delete non-required instances of include <linux/init.h>
2014-01-06 21:25:18 -08:00
pci-swiotlb.c
x86: enable DMA CMA with swiotlb
2014-06-04 16:53:57 -07:00
pcspeaker.c
…
perf_regs.c
perf: Fix off by one test in perf_reg_value()
2012-09-19 17:08:40 +02:00
pmc_atom.c
x86/platform/pmc_atom: Fix warning when CONFIG_DEBUG_FS=n
2014-09-19 13:02:21 +02:00
probe_roms.c
x86/pci/probe_roms: Add missing __iomem annotation to pci_map_biosrom()
2012-09-05 10:52:25 +02:00
process_32.c
x86: copy_thread: Don't nullify ->ptrace_bps twice
2014-09-02 14:51:17 -07:00
process_64.c
x86: copy_thread: Don't nullify ->ptrace_bps twice
2014-09-02 14:51:17 -07:00
process.c
x86, fpu: Shift "fpu_counter = 0" from copy_thread() to arch_dup_task_struct()
2014-09-02 14:51:16 -07:00
ptrace.c
Merge git://git.infradead.org/users/eparis/audit
2014-10-19 16:25:56 -07:00
pvclock.c
hung_task: add method to reset detector
2013-11-06 09:49:02 +02:00
quirks.c
x86: HPET force enable for e6xx based systems
2014-09-15 17:53:35 -07:00
reboot_fixups_32.c
…
reboot.c
x86/reboot: Add EFI reboot quirk for ACPI Hardware Reduced flag
2014-07-18 21:23:52 +01:00
relocate_kernel_32.S
x86, asm, cleanup: Replace open-coded control register values with symbolic
2013-06-25 16:26:06 -07:00
relocate_kernel_64.S
x86, reloc: Use xorl instead of xorq in relocate_kernel_64.S
2013-06-20 21:30:04 -07:00
resource.c
x86: don't exclude low BIOS area when allocating address space for non-PCI cards
2014-07-16 12:29:36 -06:00
rtc.c
Merge branch 'x86-intel-mid-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2013-11-12 11:12:22 +09:00
setup_percpu.c
…
setup.c
x86: Quark: Comment setup_arch() to document TLB/PGE bug
2014-10-08 10:07:46 +02:00
signal.c
x86, fpu: shift drop_init_fpu() from save_xstate_sig() to handle_signal()
2014-09-02 14:51:14 -07:00
smp.c
asmlinkage, x86: Add explicit __visible to arch/x86/*
2014-05-05 16:07:44 -07:00
smpboot.c
Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2014-10-13 18:20:39 +02:00
stacktrace.c
…
step.c
ptrace: ensure arch_ptrace/ptrace_request can never race with SIGKILL
2013-01-22 10:08:00 -08:00
sys_x86_64.c
x86 get_unmapped_area: Access mmap_legacy_base through mm_struct member
2013-08-22 10:19:35 -07:00
syscall_32.c
x86, asmlinkage: Make syscall tables visible
2013-08-06 14:20:18 -07:00
syscall_64.c
x86, asmlinkage: Make syscall tables visible
2013-08-06 14:20:18 -07:00
sysfb_efi.c
x86: sysfb: move EFI quirks from efifb to sysfb
2013-08-02 16:17:47 -07:00
sysfb_simplefb.c
x86/simplefb: Mark framebuffer mem-resources as IORESOURCE_BUSY to avoid bootup warning
2013-10-03 07:51:11 +02:00
sysfb.c
x86: sysfb: move EFI quirks from efifb to sysfb
2013-08-02 16:17:47 -07:00
tboot.c
x86 / tboot / ACPI: Fail extended mode reduced hardware sleep
2013-07-31 14:25:51 +02:00
tce_64.c
…
test_nx.c
…
test_rodata.c
…
time.c
x86: Fix non-PC platform kernel crash on boot due to NULL dereference
2014-08-25 22:36:57 +02:00
tls.c
make SYSCALL_DEFINE<n>-generated wrappers do asmlinkage_protect
2013-03-03 22:58:33 -05:00
tls.h
…
topology.c
hotplug, powerpc, x86: Remove cpu_hotplug_driver_lock()
2013-09-30 19:55:51 +02:00
trace_clock.c
tracing,x86: Add a TSC trace_clock
2012-11-13 15:48:27 -05:00
tracepoint.c
x86: Make sure IDT is page aligned
2013-07-16 15:14:48 -07:00
traps.c
x86/kprobes: Fix build errors and blacklist context_track_user
2014-06-14 09:07:44 +02:00
tsc_msr.c
x86: tsc: Add missing Baytrail frequency to the table
2014-02-19 17:12:24 +01:00
tsc_sync.c
x86: Delete non-required instances of include <linux/init.h>
2014-01-06 21:25:18 -08:00
tsc.c
Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2014-08-05 17:46:42 -07:00
uprobes.c
uprobes/x86: Rename arch_uprobe->def to ->defparam, minor comment updates
2014-06-05 16:21:57 +02:00
verify_cpu.S
…
vm86_32.c
x86, vm86: fix VM86 syscalls: use SYSCALL_DEFINEx(...)
2013-05-02 20:36:32 -04:00
vmlinux.lds.S
x86, vdso: Zero-pad the VVAR page
2014-03-18 12:52:44 -07:00
vsmp_64.c
x86/apic/vsmp: Make is_vsmp_box() static
2014-08-01 15:09:45 -07:00
vsyscall_64.c
seccomp,x86,arm,mips,s390: Remove nr parameter from secure_computing
2014-09-03 14:58:17 -07:00
vsyscall_emu_64.S
…
vsyscall_gtod.c
timekeeping: Create struct tk_read_base and use it in struct timekeeper
2014-07-23 15:01:53 -07:00
vsyscall_trace.h
…
x86_init.c
PCI: Drop "irq" param from *_restore_msi_irqs()
2013-12-13 08:44:30 -07:00
x8664_ksyms_64.c
sched, x86: Optimize the preempt_schedule() call
2013-09-25 14:23:07 +02:00
xsave.c
x86, fpu: __restore_xstate_sig()->math_state_restore() needs preempt_disable()
2014-09-02 14:51:15 -07:00