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6d9c00c67b
linux/arch/powerpc/kernel
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Michael Neuling 6d9c00c67b powerpc: Fix null pointer deref in perf hardware breakpoints 
Currently if you are doing a global perf recording with hardware
breakpoints (ie perf record -e mem:0xdeadbeef -a), you can oops with:

  Faulting instruction address: 0xc000000000738890
  cpu 0xc: Vector: 300 (Data Access) at [c0000003f76af8d0]
      pc: c000000000738890: .hw_breakpoint_handler+0xa0/0x1e0
      lr: c000000000738830: .hw_breakpoint_handler+0x40/0x1e0
      sp: c0000003f76afb50
     msr: 8000000000001032
     dar: 6f0
   dsisr: 42000000
    current = 0xc0000003f765ac00
    paca    = 0xc00000000f262a00   softe: 0        irq_happened: 0x01
    pid   = 6810, comm = loop-read
  enter ? for help
  [c0000003f76afbe0] c00000000073cd04 .notifier_call_chain.isra.0+0x84/0xe0
  [c0000003f76afc80] c00000000073cdbc .notify_die+0x3c/0x60
  [c0000003f76afd20] c0000000000139f0 .do_dabr+0x40/0xf0
  [c0000003f76afe30] c000000000005a9c handle_dabr_fault+0x14/0x48
  --- Exception: 300 (Data Access) at 0000000010000480
  SP (ff8679e0) is in userspace

This is because we don't check to see if the break point is associated
with task before we deference the task_struct pointer.

This changes the update to use current.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2012-08-24 20:26:04 +10:00
..
vdso32 powerpc: Add VDSO version of getcpu 2012-07-11 14:18:40 +10:00
vdso64 powerpc: Add VDSO version of getcpu 2012-07-11 14:18:40 +10:00
.gitignore
align.c Disintegrate asm/system.h for PowerPC 2012-03-28 18:30:02 +01:00
asm-offsets.c powerpc: Add VDSO version of getcpu 2012-07-11 14:18:40 +10:00
audit.c
btext.c powerpc: various straight conversions from module.h --> export.h 2011-10-31 19:30:44 -04:00
cacheinfo.c cpu: convert 'cpu' and 'machinecheck' sysdev_class to a regular subsystem 2011-12-21 14:29:42 -08:00
cacheinfo.h
clock.c powerpc: various straight conversions from module.h --> export.h 2011-10-31 19:30:44 -04:00
compat_audit.c
cpu_setup_6xx.S powerpc: Fix some 6xx/7xxx CPU setup functions 2011-02-07 12:57:11 +11:00
cpu_setup_44x.S powerpc/44x: Add support for the AMCC APM821xx SoC 2010-10-13 08:47:09 -04:00
cpu_setup_a2.S powerpc: Enforce usage of RA 0-R31 where possible 2012-07-10 19:18:35 +10:00
cpu_setup_fsl_booke.S KVM: PPC: e500mc support 2012-04-08 12:54:33 +03:00
cpu_setup_pa6t.S
cpu_setup_power7.S powerpc, KVM: Split HVMODE_206 cpu feature bit into separate HV and architecture bits 2011-07-12 13:16:58 +03:00
cpu_setup_ppc970.S powerpc, KVM: Split HVMODE_206 cpu feature bit into separate HV and architecture bits 2011-07-12 13:16:58 +03:00
cputable.c Disintegrate asm/system.h for PowerPC 2012-03-28 18:30:02 +01:00
crash_dump.c powerpc: Rename mapping based RELOCATABLE to DYNAMIC_MEMSTART for BookE 2011-12-20 10:20:19 -05:00
crash.c Disintegrate asm/system.h for PowerPC 2012-03-28 18:30:02 +01:00
dbell.c powerpc: Rework lazy-interrupt handling 2012-03-09 13:25:06 +11:00
dma-iommu.c common: dma-mapping: add support for generic dma_mmap_* calls 2012-07-30 12:25:46 +02:00
dma-swiotlb.c common: dma-mapping: add support for generic dma_mmap_* calls 2012-07-30 12:25:46 +02:00
dma.c Merge branch 'for-linus-for-3.6-rc1' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping 2012-07-30 10:11:31 -07:00
entry_32.S powerpc: Set stack limit properly in crit_transfer_to_handler 2012-07-27 11:42:31 +10:00
entry_64.S powerpc: Use CURRENT_THREAD_INFO instead of open coded assembly 2012-07-11 14:18:22 +10:00
epapr_hcalls.S KVM: PPC: Factor out guest epapr initialization 2012-05-30 11:43:10 +02:00
epapr_paravirt.c KVM: PPC: Factor out guest epapr initialization 2012-05-30 11:43:10 +02:00
exceptions-64e.S powerpc: Use CURRENT_THREAD_INFO instead of open coded assembly 2012-07-11 14:18:22 +10:00
exceptions-64s.S powerpc: Add a symbol for hypervisor trampolines 2012-07-11 14:18:38 +10:00
fadump.c powerpc: Fix fallout from system.h split up 2012-04-02 14:00:03 +10:00
firmware.c powerpc: fix implicit use of cache.h in kernel/firmware.c 2011-10-31 19:30:41 -04:00
fpu.S powerpc: Enforce usage of R0-R31 where possible 2012-07-10 19:18:30 +10:00
fsl_booke_entry_mapping.S powerpc/fsl-booke: Fix address issue when using relocatable kernels 2010-07-11 11:04:08 -05:00
ftrace.c powerpc/ftrace: Trace function graph entry before updating index 2012-07-27 11:42:34 +10:00
head_8xx.S powerpc: Call do_page_fault() with interrupts off 2012-03-09 10:55:08 +11:00
head_32.S powerpc: Call do_page_fault() with interrupts off 2012-03-09 10:55:08 +11:00
head_40x.S powerpc: Call do_page_fault() with interrupts off 2012-03-09 10:55:08 +11:00
head_44x.S Merge branch 'next' of git://git.kernel.org/pub/scm/virt/kvm/kvm 2012-05-24 16:17:30 -07:00
head_64.S powerpc: Rework lazy-interrupt handling 2012-03-09 13:25:06 +11:00
head_booke.h KVM: PPC: booke: category E.HV (GS-mode) support 2012-04-08 12:51:19 +03:00
head_fsl_booke.S Merge remote-tracking branch 'kumar/next' into next 2012-07-13 13:38:26 +10:00
hw_breakpoint.c powerpc: Fix null pointer deref in perf hardware breakpoints 2012-08-24 20:26:04 +10:00
ibmebus.c Merge branch 'for-linus' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping 2012-04-04 17:13:43 -07:00
idle_6xx.S powerpc: Use CURRENT_THREAD_INFO instead of open coded assembly 2012-07-11 14:18:22 +10:00
idle_book3e.S powerpc: Use CURRENT_THREAD_INFO instead of open coded assembly 2012-07-11 14:18:22 +10:00
idle_e500.S powerpc: Use CURRENT_THREAD_INFO instead of open coded assembly 2012-07-11 14:18:22 +10:00
idle_power4.S powerpc: Use CURRENT_THREAD_INFO instead of open coded assembly 2012-07-11 14:18:22 +10:00
idle_power7.S KVM: PPC: Book3S HV: Make secondary threads more robust against stray IPIs 2012-04-08 14:01:20 +03:00
idle.c powerpc: Remove unused cpu_idle_wait() 2012-05-08 12:35:07 +02:00
io-workarounds.c powerpc: io-workarounds.c was implicitly getting init_mm 2011-10-31 19:30:37 -04:00
io.c powerpc: various straight conversions from module.h --> export.h 2011-10-31 19:30:44 -04:00
iomap.c powerpc: switch to GENERIC_PCI_IOMAP 2011-11-28 21:13:18 +02:00
iommu.c powerpc/iommu: Fix iommu pool initialization 2012-07-13 17:45:49 +10:00
irq.c powerpc: Fix build of some debug irq code 2012-07-10 19:16:20 +10:00
isa-bridge.c powerpc: Remove FW_FEATURE ISERIES from arch code 2012-03-21 11:16:11 +11:00
jump_label.c powerpc: Fix build breakage in jump_label.c 2011-11-16 14:25:19 +11:00
kgdb.c powerpc: Fix fallout from system.h split up 2012-04-02 14:00:03 +10:00
kprobes.c Disintegrate asm/system.h for PowerPC 2012-03-28 18:30:02 +01:00
kvm_emul.S KVM: PPC: Not optimizing MSR_CE and MSR_ME with paravirt. 2012-05-30 11:43:11 +02:00
kvm.c KVM updates for the 3.6 merge window 2012-07-24 12:01:20 -07:00
l2cr_6xx.S Fix common misspellings 2011-03-31 11:26:23 -03:00
legacy_serial.c powerpc: Fix build on some non-freescale platforms 2012-01-25 13:33:22 +11:00
lparcfg.c Disintegrate asm/system.h for PowerPC 2012-03-28 18:30:02 +01:00
machine_kexec_32.c treewide: convert uses of ATTRIB_NORETURN to __noreturn 2012-01-12 20:13:03 -08:00
machine_kexec_64.c treewide: convert uses of ATTRIB_NORETURN to __noreturn 2012-01-12 20:13:03 -08:00
machine_kexec.c powerpc/irqdomain: Fix broken NR_IRQ references 2012-04-30 10:45:26 +10:00
Makefile KVM: PPC: Factor out guest epapr initialization 2012-05-30 11:43:10 +02:00
misc_32.S powerpc: Use CURRENT_THREAD_INFO instead of open coded assembly 2012-07-11 14:18:22 +10:00
misc_64.S powerpc: Fixes for instructions not using correct register naming 2012-07-10 19:18:16 +10:00
misc.S powerpc: Remove legacy iSeries bits from assembly files 2012-03-09 10:54:59 +11:00
module_32.c powerpc: Fix kernel panic during kernel module load 2012-06-08 19:59:08 +10:00
module_64.c modules: make arch's use default loader hooks 2011-07-24 22:06:04 +09:30
module.c powerpc: remove non-required uses of include <linux/module.h> 2011-10-31 19:30:44 -04:00
msi.c
nvram_64.c powerpc/nvram: Generalize code for OS partitions in NVRAM 2011-03-04 18:19:04 +11:00
of_platform.c powerpc/eeh: Introduce EEH device 2012-03-09 11:39:29 +11:00
paca.c powerpc: Remove iseries specific fields in lppaca 2012-04-30 15:37:16 +10:00
pci_32.c powerpc/PCI: compute I/O space bus-to-resource offset consistently 2012-03-20 10:41:44 -07:00
pci_64.c PCI: replace struct pci_bus secondary/subordinate with busn_res 2012-06-13 15:42:22 -06:00
pci_dn.c powerpc/powernv: PCI support for p7IOC under OPAL v2 2011-11-25 14:53:15 +11:00
pci_of_scan.c PCI changes for the 3.6 merge window: 2012-07-24 16:17:07 -07:00
pci-common.c PCI changes for the 3.6 merge window: 2012-07-24 16:17:07 -07:00
pmc.c bug.h: add include of it to various implicit C users 2012-02-29 17:15:08 -05:00
ppc32.h
ppc_ksyms.c powerpc: Use the new generic strncpy_from_user() and strnlen_user() 2012-05-27 21:00:07 -07:00
ppc_save_regs.S Fix common misspellings 2011-03-31 11:26:23 -03:00
proc_powerpc.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
process.c Merge branch 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-05-23 10:59:07 -07:00
prom_init_check.sh powerpc/powernv: Get kernel command line accross OPAL takeover 2011-09-20 16:09:48 +10:00
prom_init.c powerpc: Fix Section mismatch warnings in prom_init.c 2012-06-29 14:35:36 +10:00
prom_parse.c powerpc: remove non-required uses of include <linux/module.h> 2011-10-31 19:30:44 -04:00
prom.c Disintegrate asm/system.h for PowerPC 2012-03-28 18:30:02 +01:00
ptrace32.c powerpc: Remove old powerpc specific ptrace getregs/setregs calls 2012-04-30 15:37:28 +10:00
ptrace.c Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2012-05-23 09:02:42 -07:00
reloc_32.S powerpc: Process dynamic relocations for kernel 2011-12-20 10:21:08 -05:00
reloc_64.S
rtas_flash.c powerpc: Lack of firmware flash support is not an error 2012-07-27 11:42:33 +10:00
rtas_pci.c Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci 2012-03-23 14:02:12 -07:00
rtas-proc.c powerpc: Move /proc/ppc64 to /proc/powerpc update 2010-01-15 13:26:17 +11:00
rtas-rtc.c powerpc/rtas-rtc: remove sideeffects of printk_ratelimit 2011-06-29 15:30:43 +10:00
rtas.c Disintegrate and delete asm/system.h 2012-03-28 15:58:21 -07:00
rtasd.c powerpc/pseries: Cancel RTAS event scan before firmware flash 2011-11-25 14:11:29 +11:00
setup_32.c powerpc/watchdog: move booke watchdog param related code to setup-common.c 2012-07-11 07:44:03 -05:00
setup_64.c Disintegrate and delete asm/system.h 2012-03-28 15:58:21 -07:00
setup-common.c powerpc/watchdog: move booke watchdog param related code to setup-common.c 2012-07-11 07:44:03 -05:00
setup.h
signal_32.c powerpc: get rid of restore_sigmask() 2012-06-01 12:58:51 -04:00
signal_64.c powerpc: get rid of restore_sigmask() 2012-06-01 12:58:51 -04:00
signal.c new helper: signal_delivered() 2012-06-01 12:58:52 -04:00
signal.h powerpc: get rid of restore_sigmask() 2012-06-01 12:58:51 -04:00
smp-tbsync.c atomic: use <linux/atomic.h> 2011-07-26 16:49:47 -07:00
smp.c powerpc: Add VDSO version of getcpu 2012-07-11 14:18:40 +10:00
softemu8xx.c Disintegrate asm/system.h for PowerPC 2012-03-28 18:30:02 +01:00
stacktrace.c powerpc: various straight conversions from module.h --> export.h 2011-10-31 19:30:44 -04:00
suspend.c update email address 2010-07-19 10:56:54 +02:00
swsusp_32.S Fix common misspellings 2011-03-31 11:26:23 -03:00
swsusp_64.c Disintegrate asm/system.h for PowerPC 2012-03-28 18:30:02 +01:00
swsusp_asm64.S
swsusp_booke.S powerpc/fsl-booke: Add hibernation support for FSL BookE processors 2010-05-21 07:41:53 -05:00
swsusp.c Disintegrate asm/system.h for PowerPC 2012-03-28 18:30:02 +01:00
sys_ppc32.c Disintegrate asm/system.h for PowerPC 2012-03-28 18:30:02 +01:00
syscalls.c Add generic sys_olduname() 2010-03-12 15:52:32 -08:00
sysfs.c Disintegrate asm/system.h for PowerPC 2012-03-28 18:30:02 +01:00
systbl_chk.c
systbl_chk.sh
systbl.S
tau_6xx.c tree-wide: fix assorted typos all over the place 2009-12-04 15:39:55 +01:00
time.c powerpc/time: Sanity check of decrementer expiration is necessary 2012-06-08 14:07:35 +10:00
traps.c powerpc/irq: Make alignment & program interrupt behave the same 2012-05-09 09:42:33 +10:00
udbg_16550.c powerpc: Add early debug for WSP platforms 2011-05-06 13:32:41 +10:00
udbg.c powerpc: Random little legacy iSeries removal tidy ups 2012-03-28 11:33:23 +11:00
vdso.c powerpc: Add VDSO version of getcpu 2012-07-11 14:18:40 +10:00
vecemu.c
vector.S powerpc: Optimise enable_kernel_altivec 2012-04-30 15:37:17 +10:00
vio.c Merge branch 'for-linus-for-3.6-rc1' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping 2012-07-30 10:11:31 -07:00
vmlinux.lds.S powerpc: Remove legacy iSeries bits from assembly files 2012-03-09 10:54:59 +11:00