Suresh Siddha 06c38d5e36 x86-64: fix FPU corruption with signals and preemption ...

In 64bit signal delivery path, clear_used_math() was happening before saving
the current active FPU state on to the user stack for signal handling. Between
clear_used_math() and the state store on to the user stack, potentially we
can get a page fault for the user address and can block. Infact, while testing
we were hitting the might_fault() in __clear_user() which can do a schedule().

At a later point in time, we will schedule back into this process and
resume the save state (using "xsave/fxsave" instruction) which can lead
to DNA fault. And as used_math was cleared before, we will reinit the FP state
in the DNA fault and continue. This reinit will result in loosing the
FPU state of the process.

Move clear_used_math() to a point after the FPU state has been stored
onto the user stack.

This issue is present from a long time (even before the xsave changes
and the x86 merge). But it can easily be exposed in 2.6.28.x and 2.6.29.x
series because of the __clear_user() in this path, which has an explicit
__cond_resched() leading to a context switch with CONFIG_PREEMPT_VOLUNTARY.

[ Impact: fix FPU state corruption ]

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: <stable@kernel.org>			[2.6.28.x, 2.6.29.x]
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

2009-04-20 14:33:00 -07:00

..

acpi

Merge branch 'linus' into release

2009-04-05 02:14:15 -04:00

apic

x86/uv: fix for no memory at paddr 0

2009-04-20 18:09:18 +02:00

cpu

acpi-cpufreq: fix 'smp_call_function_many()' confusion

2009-04-15 08:41:16 -07:00

.gitignore

arch/x86/kernel/.gitignore: Added vmlinux.lds to .gitignore file because it shouldn't be tracked.

2008-07-10 10:13:51 -07:00

alternative.c

x86: expand irq-off region in text_poke()

2009-03-10 16:24:23 +01:00

amd_iommu_init.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/linux-2.6-iommu

2009-01-03 12:03:52 -08:00

amd_iommu.c

Merge git://git.infradead.org/iommu-2.6

2009-04-03 10:36:57 -07:00

aperture_64.c

aperture_64.c: clarify that too small aperture is valid reason for this code

2008-11-28 15:24:39 +01:00

apm_32.c

Merge branch 'cpumask-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2009-03-31 13:33:50 +10:30

asm-offsets_32.c

pm: rework includes, remove arch ifdefs

2009-04-01 08:59:16 -07:00

asm-offsets_64.c

pm: rework includes, remove arch ifdefs

2009-04-01 08:59:16 -07:00

asm-offsets.c

…

audit_64.c

…

bios_uv.c

x86, UV: system table in bios accessed after unmap

2009-04-03 19:25:57 +02:00

bootflag.c

…

check.c

x86: fix 64k corruption-check

2009-03-15 07:03:15 +01:00

cpuid.c

Merge branch 'cpus4096-for-linus-3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2009-01-03 12:04:39 -08:00

crash_dump_32.c

kdump: make elfcorehdr_addr independent of CONFIG_PROC_VMCORE

2008-10-20 08:52:39 -07:00

crash_dump_64.c

kdump: make elfcorehdr_addr independent of CONFIG_PROC_VMCORE

2008-10-20 08:52:39 -07:00

crash.c

x86, apic: remove duplicate asm/apic.h inclusions

2009-02-17 17:52:44 +01:00

doublefault_32.c

x86: fix virt_addr_valid() with CONFIG_DEBUG_VIRTUAL=y, v2

2008-10-13 10:33:15 +02:00

ds.c

x86, pebs: correct qualifier passed to ds_write_config() from ds_request_pebs()

2009-03-06 16:13:15 +01:00

dumpstack_32.c

ftrace: print real return in dumpstack for function graph

2008-12-03 08:56:25 +01:00

dumpstack_64.c

x86-64: Move current task from PDA to per-cpu and consolidate with 32-bit.

2009-01-19 00:38:58 +09:00

dumpstack.c

Merge commit 'origin/master' into next

2009-03-30 14:04:53 +11:00

dumpstack.h

ftrace: print real return in dumpstack for function graph

2008-12-03 08:56:25 +01:00

e820.c

x86: e820 fix various signedness issues in setup.c and e820.c

2009-03-23 15:02:05 +05:30

early_printk.c

x86: properly __init-annotate recent early_printk additions

2009-03-13 02:37:18 +01:00

early-quirks.c

x86: only scan the root bus in early PCI quirks

2009-01-09 12:46:22 -08:00

efi_32.c

x86: fix i486 suspend to disk CR4 oops

2008-08-18 08:50:19 +02:00

efi_64.c

Merge branch 'core/percpu' into percpu-cpumask-x86-for-linus-2

2009-03-27 17:28:43 +01:00

efi_stub_32.S

Merge branch 'x86/asm' into x86/mm

2009-02-25 08:27:46 +01:00

efi_stub_64.S

x86: efi_stub_32,64 - add missing ENDPROCs

2009-02-24 18:08:40 +01:00

efi.c

Merge branch 'core/percpu' into percpu-cpumask-x86-for-linus-2

2009-03-27 17:28:43 +01:00

entry_32.S

x86: entry_32.S fix compile warnings - fix work mask bit width

2009-03-14 09:42:51 +01:00

entry_64.S

x86-64: move save_paranoid into .kprobes.text

2009-03-12 11:57:46 +01:00

ftrace.c

tracing/syscalls: use a dedicated file header

2009-04-09 05:43:32 +02:00

geode_32.c

x86, geode: add a VSA2 ID for General Software

2008-06-19 14:19:03 +02:00

head32.c

x86-32: use brk segment for allocating initial kernel pagetable

2009-03-14 17:23:47 -07:00

head64.c

x86: add brk allocation for very, very early allocations

2009-03-14 15:37:14 -07:00

head_32.S

x86-32: tighten the bound on additional memory to map

2009-03-17 11:52:10 -07:00

head_64.S

x86: head_64.S - use IDT_ENTRIES instead of hardcoded number

2009-02-24 18:08:38 +01:00

head.c

x86, debug: remove EBDA debug printk

2008-12-12 11:08:42 +01:00

hpet.c

x86: hpet: stop HPET_COUNTER when programming periodic mode

2009-02-22 18:01:18 +01:00

i386_ksyms_32.c

ftrace: rename FTRACE to FUNCTION_TRACER

2008-10-20 18:27:03 +02:00

i387.c

x86, math-emu: fix init_fpu for task != current

2009-03-04 20:33:16 +01:00

i8237.c

i8327: fix outb() parameter order

2009-02-10 13:13:23 +01:00

i8253.c

x86: i8253 cleanup

2009-03-21 16:56:10 +05:30

i8259.c

x86: refactor x86_quirks support

2009-02-23 00:08:11 +01:00

init_task.c

take init_fs to saner place

2008-12-31 18:07:42 -05:00

io_delay.c

x86: io_delay.c cleanup

2009-03-21 16:57:04 +05:30

ioport.c

x86-32: use non-lazy io bitmap context switching

2009-03-02 12:07:48 +01:00

irq_32.c

Merge branch 'tj-percpu' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc into core/percpu

2009-02-24 21:52:45 +01:00

irq_64.c

x86: unify do_IRQ()

2009-02-09 12:16:05 +01:00

irq.c

x86: smarten /proc/interrupts output for new counters

2009-04-08 18:06:07 +02:00

irqinit_32.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-cpumask

2009-03-30 18:00:26 -07:00

irqinit_64.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-cpumask

2009-03-30 18:00:26 -07:00

k8.c

x86, gart: fix gart detection for Fam11h CPUs

2008-10-28 17:10:27 +01:00

kdebugfs.c

x86: kdebugfs.c cleanup

2009-03-21 16:55:45 +05:30

kgdb.c

x86, apic: remove genapic.h

2009-02-17 17:52:44 +01:00

kprobes.c

Merge branch 'tracing/core-v2' into tracing-for-linus

2009-04-02 00:49:02 +02:00

kvm.c

x86: with the last user gone, remove set_pte_present

2009-03-19 14:04:19 +01:00

kvmclock.c

x86: refactor x86_quirks support

2009-02-23 00:08:11 +01:00

ldt.c

x86: ldt.c fix style problems

2009-01-02 17:46:24 +01:00

machine_kexec_32.c

x86, kexec: fix kexec x86 coding style

2009-03-10 18:13:25 -07:00

machine_kexec_64.c

x86, kexec: x86_64: add kexec jump support for x86_64

2009-03-10 18:13:25 -07:00

Makefile

Merge branch 'tracing/core-v2' into tracing-for-linus

2009-04-02 00:49:02 +02:00

mca_32.c

x86: refactor x86_quirks support

2009-02-23 00:08:11 +01:00

mfgpt_32.c

cpumask: remove references to struct irqaction's mask field.

2009-03-30 22:05:14 +10:30

microcode_amd.c

x86: microcode: cleanup

2009-03-18 13:51:17 +01:00

microcode_core.c

Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2009-04-17 09:56:11 -07:00

microcode_intel.c

x86: microcode: cleanup

2009-03-18 13:51:17 +01:00

mmconf-fam10h_64.c

x86: move various CPU initialization objects into .cpuinit.rodata

2009-03-12 13:13:07 +01:00

module_32.c

x86: module_32.c fix style problems

2009-01-12 11:22:55 +01:00

module_64.c

x86: module_64.c fix style problems

2009-01-12 11:23:01 +01:00

mpparse.c

x86: Fix section mismatches in mpparse

2009-04-12 12:32:18 +02:00

msr.c

x86: msr.c fix style problems

2009-01-12 11:22:50 +01:00

olpc.c

x86, olpc: fix model detection without OFW

2009-02-14 23:05:25 +01:00

paravirt_patch_32.c

x86/pvops: add a paravirt_ident functions to allow special patching

2009-01-30 14:51:44 -08:00

paravirt_patch_64.c

x86/pvops: add a paravirt_ident functions to allow special patching

2009-01-30 14:51:44 -08:00

paravirt-spinlocks.c

x86: remove byte locks

2009-01-20 17:14:28 +01:00

paravirt.c

x86: with the last user gone, remove set_pte_present

2009-03-19 14:04:19 +01:00

pci-calgary_64.c

x86, ia64: convert to use generic dma_map_ops struct

2009-01-06 14:06:57 +01:00

pci-dma.c

dma-mapping: replace all DMA_24BIT_MASK macro with DMA_BIT_MASK(24)

2009-04-07 08:31:12 -07:00

pci-gart_64.c

Merge branch 'linus' into core/iommu

2009-03-05 12:47:28 +01:00

pci-nommu.c

dma-mapping: replace all DMA_32BIT_MASK macro with DMA_BIT_MASK(32)

2009-04-07 08:31:11 -07:00

pci-swiotlb.c

x86: pci-swiotlb.c swiotlb_dma_ops should be static

2009-04-14 02:51:04 +02:00

pcspeaker.c

x86: use platform_device_register_simple()

2008-09-22 12:58:36 +02:00

pmtimer_64.c

…

probe_roms_32.c

x86: move mach-default/*.h files to asm/

2009-01-29 14:16:51 +01:00

process_32.c

Simplify copy_thread()

2009-04-02 19:04:51 -07:00

process_64.c

Simplify copy_thread()

2009-04-02 19:04:51 -07:00

process.c

Merge branch 'tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2009-04-05 11:04:19 -07:00

ptrace.c

tracing/syscalls: use a dedicated file header

2009-04-09 05:43:32 +02:00

pvclock.c

x86: pvclock: fix shadowed variable warning

2008-10-15 14:25:14 +02:00

quirks.c

Merge branch 'linus' into x86/core

2009-03-28 22:27:45 +01:00

reboot_fixups_32.c

…

reboot.c

x86: DMI match for the Dell DXP061 as it needs BIOS reboot

2009-04-08 17:53:27 +02:00

relocate_kernel_32.S

x86, kexec: fix kexec x86 coding style

2009-03-10 18:13:25 -07:00

relocate_kernel_64.S

x86, kexec: x86_64: add kexec jump support for x86_64

2009-03-10 18:13:25 -07:00

rtc.c

x86: rtc.c cleanup

2009-03-21 16:56:37 +05:30

scx200_32.c

…

setup_percpu.c

x86: remove duplicated code with pcpu_need_numa()

2009-04-02 06:08:05 +02:00

setup.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-cpumask

2009-03-30 18:00:26 -07:00

signal.c

x86: signal: check sas_ss_size instead of sas_ss_flags()

2009-04-01 17:13:17 +02:00

smp.c

x86, apic: remove genapic.h

2009-02-17 17:52:44 +01:00

smpboot.c

cpumask: use new cpumask functions throughout x86

2009-03-13 14:49:54 +10:30

stacktrace.c

x86: update copyrights

2009-01-31 04:21:18 +01:00

step.c

x86 ptrace: user-sets-TF nits

2008-07-16 12:15:17 -07:00

sys_i386_32.c

x86: Introducing asm/syscalls.h

2008-07-22 14:35:57 +02:00

sys_x86_64.c

Merge branches 'x86/alternatives', 'x86/cleanups', 'x86/commandline', 'x86/crashdump', 'x86/debug', 'x86/defconfig', 'x86/doc', 'x86/exports', 'x86/fpu', 'x86/gart', 'x86/idle', 'x86/mm', 'x86/mtrr', 'x86/nmi-watchdog', 'x86/oprofile', 'x86/paravirt', 'x86/reboot', 'x86/sparse-fixes', 'x86/tsc', 'x86/urgent' and 'x86/vmalloc' into x86-v28-for-linus-phase1

2008-10-06 18:17:07 +02:00

syscall_64.c

x86: Fix ASM_X86__ header guards

2008-10-22 22:55:23 -07:00

syscall_table_32.S

preadv/pwritev: Add preadv and pwritev system calls.

2009-04-02 19:05:08 -07:00

tce_64.c

…

test_nx.c

…

test_rodata.c

…

time_32.c

x86: refactor x86_quirks support

2009-02-23 00:08:11 +01:00

time_64.c

cpumask: remove references to struct irqaction's mask field.

2009-03-30 22:05:14 +10:30

tlb_uv.c

Merge branch 'x86/uv' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2009-04-16 16:43:20 -07:00

tls.c

x86: Introducing asm/syscalls.h

2008-07-22 14:35:57 +02:00

tls.h

…

topology.c

x86: topology.c cleanup

2009-03-21 16:55:24 +05:30

trampoline_32.S

x86: use _types.h headers in asm where available

2009-02-13 11:35:01 -08:00

trampoline_64.S

x86: use _types.h headers in asm where available

2009-02-13 11:35:01 -08:00

trampoline.c

x86: change static allocation of trampoline area

2008-12-08 13:49:45 +01:00

traps.c

x86-32: use non-lazy io bitmap context switching

2009-03-02 12:07:48 +01:00

tsc_sync.c

Merge branches 'x86/apic', 'x86/cleanups', 'x86/cpufeature', 'x86/crashdump', 'x86/debug', 'x86/defconfig', 'x86/detect-hyper', 'x86/doc', 'x86/dumpstack', 'x86/early-printk', 'x86/fpu', 'x86/idle', 'x86/io', 'x86/memory-corruption-check', 'x86/microcode', 'x86/mm', 'x86/mtrr', 'x86/nmi-watchdog', 'x86/pat2', 'x86/pci-ioapic-boot-irq-quirks', 'x86/ptrace', 'x86/quirks', 'x86/reboot', 'x86/setup-memory', 'x86/signal', 'x86/sparse-fixes', 'x86/time', 'x86/uv' and 'x86/xen' into x86/core

2008-12-23 16:27:23 +01:00

tsc.c

Merge branch 'core/percpu' into percpu-cpumask-x86-for-linus-2

2009-03-27 17:28:43 +01:00

uv_irq.c

x86, apic: remove genapic.h

2009-02-17 17:52:44 +01:00

uv_sysfs.c

x86: prevent /sys/firmware/sgi_uv from being created on non-uv systems

2009-04-08 14:58:10 +02:00

uv_time.c

x86: UV, SGI RTC: fix uv_time.c for UP

2009-03-05 11:27:49 +01:00

verify_cpu_64.S

…

visws_quirks.c

x86: convert obsolete irq_desc_t typedef to struct irq_desc

2009-03-11 09:49:01 +01:00

vm86_32.c

x86: use regparm(3) for passed-in pt_regs pointer

2009-02-11 14:00:56 -08:00

vmi_32.c

x86: with the last user gone, remove set_pte_present

2009-03-19 14:04:19 +01:00

vmiclock_32.c

cpumask: remove references to struct irqaction's mask field.

2009-03-30 22:05:14 +10:30

vmlinux_32.lds.S

x86-32: move _end to a dummy section

2009-03-17 14:16:02 -07:00

vmlinux_64.lds.S

x86/brk: put the brk reservations in their own section

2009-03-17 12:58:15 -07:00

vmlinux.lds.S

…

vsmp_64.c

Revert "x86: don't compile vsmp_64 for 32bit"

2009-03-25 21:34:28 +01:00

vsyscall_64.c

Merge branch 'tracing-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2008-12-28 12:21:10 -08:00

x8664_ksyms_64.c

x86: convert pda ops to wrappers around x86 percpu accessors

2009-01-16 14:20:22 +01:00

xsave.c

x86-64: fix FPU corruption with signals and preemption

2009-04-20 14:33:00 -07:00