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6ffac1e90a
android_kernel_xiaomi_sm8350/arch/x86/kernel
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Suresh Siddha 6ffac1e90a x64, fpu: fix possible FPU leakage in error conditions 
On Thu, Jul 24, 2008 at 03:43:44PM -0700, Linus Torvalds wrote:
> So how about this patch as a starting point? This is the RightThing(tm) to
> do regardless, and if it then makes it easier to do some other cleanups,
> we should do it first. What do you think?

restore_fpu_checking() calls init_fpu() in error conditions.

While this is wrong(as our main intention is to clear the fpu state of
the thread), this was benign before commit 92d140e21f ("x86: fix taking
DNA during 64bit sigreturn").

Post commit 92d140e21f, live FPU registers may not belong to this
process at this error scenario.

In the error condition for restore_fpu_checking() (especially during the
64bit signal return), we are doing init_fpu(), which saves the live FPU
register state (possibly belonging to some other process context) into
the thread struct (through unlazy_fpu() in init_fpu()). This is wrong
and can leak the FPU data.

For the signal handler restore error condition in restore_i387(), clear
the fpu state present in the thread struct(before ultimately sending a
SIGSEGV for badframe).

For the paranoid error condition check in math_state_restore(), send a
SIGSEGV, if we fail to restore the state.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: <stable@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-26 16:37:04 +02:00
..
acpi pm: acpi hibernation: utilize hardware signature 2008-07-24 10:47:24 -07:00
cpu Merge branch 'cpus4096-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-07-23 18:37:44 -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: fix SMP alternatives: use mutex instead of spinlock, text_poke is sleepable 2008-05-23 21:56:52 +02:00
amd_iommu_init.c Merge branches 'x86/urgent', 'x86/amd-iommu', 'x86/apic', 'x86/cleanups', 'x86/core', 'x86/cpu', 'x86/fixmap', 'x86/gart', 'x86/kprobes', 'x86/memtest', 'x86/modules', 'x86/nmi', 'x86/pat', 'x86/reboot', 'x86/setup', 'x86/step', 'x86/unify-pci', 'x86/uv', 'x86/xen' and 'xen-64bit' into x86/for-linus 2008-07-21 16:37:17 +02:00
amd_iommu.c Merge branches 'x86/urgent', 'x86/amd-iommu', 'x86/apic', 'x86/cleanups', 'x86/core', 'x86/cpu', 'x86/fixmap', 'x86/gart', 'x86/kprobes', 'x86/memtest', 'x86/modules', 'x86/nmi', 'x86/pat', 'x86/reboot', 'x86/setup', 'x86/step', 'x86/unify-pci', 'x86/uv', 'x86/xen' and 'xen-64bit' into x86/for-linus 2008-07-21 16:37:17 +02:00
aperture_64.c x86: make only GART code include gart.h 2008-07-11 11:00:54 +02:00
apic_32.c Merge branches 'x86/urgent', 'x86/amd-iommu', 'x86/apic', 'x86/cleanups', 'x86/core', 'x86/cpu', 'x86/fixmap', 'x86/gart', 'x86/kprobes', 'x86/memtest', 'x86/modules', 'x86/nmi', 'x86/pat', 'x86/reboot', 'x86/setup', 'x86/step', 'x86/unify-pci', 'x86/uv', 'x86/xen' and 'xen-64bit' into x86/for-linus 2008-07-21 16:37:17 +02:00
apic_64.c Merge branches 'x86/urgent', 'x86/amd-iommu', 'x86/apic', 'x86/cleanups', 'x86/core', 'x86/cpu', 'x86/fixmap', 'x86/gart', 'x86/kprobes', 'x86/memtest', 'x86/modules', 'x86/nmi', 'x86/pat', 'x86/reboot', 'x86/setup', 'x86/step', 'x86/unify-pci', 'x86/uv', 'x86/xen' and 'xen-64bit' into x86/for-linus 2008-07-21 16:37:17 +02:00
apm_32.c remove include/linux/pm_legacy.h 2008-07-24 10:47:22 -07:00
asm-offsets_32.c x86/paravirt: split sysret and sysexit 2008-07-08 13:13:15 +02:00
asm-offsets_64.c xen64: add asm-offsets 2008-07-16 10:58:55 +02:00
asm-offsets.c
audit_64.c
bios_uv.c x86 BIOS interface for RTC on SGI UV 2008-07-18 14:35:14 +02:00
bootflag.c
cpuid.c device create: x86: convert device_create to device_create_drvdata 2008-07-21 21:54:46 -07:00
crash_dump_32.c
crash_dump_64.c
crash.c
doublefault_32.c
ds.c
e820.c x86: introduce x86_quirks 2008-07-20 09:18:17 +02:00
early_printk.c x86, generic: mark early_printk as asmlinkage 2008-06-18 13:11:01 +02:00
early-quirks.c Merge branches 'x86/urgent', 'x86/amd-iommu', 'x86/apic', 'x86/cleanups', 'x86/core', 'x86/cpu', 'x86/fixmap', 'x86/gart', 'x86/kprobes', 'x86/memtest', 'x86/modules', 'x86/nmi', 'x86/pat', 'x86/reboot', 'x86/setup', 'x86/step', 'x86/unify-pci', 'x86/uv', 'x86/xen' and 'xen-64bit' into x86/for-linus 2008-07-21 16:37:17 +02:00
efi_32.c x86: fix Intel Mac booting with EFI 2008-07-03 08:19:18 +02:00
efi_64.c x86: add flags parameter to reserve_bootmem_generic() 2008-07-08 11:49:49 +02:00
efi_stub_32.S
efi_stub_64.S
efi.c x86: introduce max_low_pfn_mapped for 64-bit 2008-07-11 10:24:04 +02:00
entry_32.S i386 syscall audit fast-path 2008-07-23 18:00:30 -07:00
entry_64.S x86_64 ia32 syscall audit fast-path 2008-07-23 17:55:22 -07:00
ftrace.c ftrace: store mcount address in rec->ip 2008-06-23 22:10:56 +02:00
genapic_64.c x86: introduce max_physical_apicid for bigsmp switching 2008-06-10 11:32:09 +02:00
genapic_flat_64.c NR_CPUS: Replace NR_CPUS in arch/x86/kernel/genapic_flat_64.c 2008-07-20 10:21:10 +02:00
genx2apic_uv_x.c Merge branch 'cpus4096-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-07-23 18:37:44 -07:00
geode_32.c x86, geode: add a VSA2 ID for General Software 2008-06-19 14:19:03 +02:00
head32.c x86: extract common part of head32.c and head64.c into head.c 2008-06-05 15:10:02 +02:00
head64.c x86_64: add workaround for no %gs-based percpu 2008-07-16 10:58:13 +02:00
head_32.S x86: boot secondary cpus through initial_code 2008-07-08 12:48:18 +02:00
head_64.S Revert "x86_64: there's no need to preallocate level1_fixmap_pgt" 2008-07-16 11:07:30 +02:00
head.c x86: move reserve_setup_data to setup.c 2008-07-08 13:16:14 +02:00
hpet.c rtc-cmos: avoid spurious irqs 2008-07-24 10:47:34 -07:00
i386_ksyms_32.c ftrace: store mcount address in rec->ip 2008-06-23 22:10:56 +02:00
i387.c x86 ptrace: fix PTRACE_GETFPXREGS error 2008-07-01 11:03:31 +02:00
i8237.c
i8253.c
i8259.c i8259: fix final ugliness 2008-06-02 11:55:52 +02:00
init_task.c [PATCH] take init_files to fs/file.c 2008-05-16 17:22:20 -04:00
io_apic_32.c x86: I/O APIC: Always report how the timer has been set up 2008-07-18 14:27:47 +02:00
io_apic_64.c Merge branch 'cpus4096-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-07-23 18:37:44 -07:00
io_delay.c x86: io delay - add checking for NULL early param 2008-07-09 13:57:54 +02:00
ioport.c
ipi.c x86: APIC: remove apic_write_around(); use alternatives 2008-07-18 12:51:21 +02:00
irq_32.c x86: use __page_aligned_data/bss 2008-07-16 10:54:39 +02:00
irq_64.c x86: make /proc/stat account for all interrupts 2008-05-25 07:11:49 +02:00
irqinit_32.c x86: rename the i8259_32/64.c leftovers to irqinit_32/64.c 2008-05-24 16:47:39 +02:00
irqinit_64.c x86-64: make BUILD_IRQ() also reset section back 2008-07-24 12:49:26 -07:00
k8.c
kdebugfs.c x86: Add a arch directory for x86 under debugfs 2008-07-18 17:22:04 -07:00
kgdb.c
kprobes.c kprobes: improve kretprobe scalability with hashed locking 2008-07-25 10:53:30 -07:00
kvm.c
kvmclock.c x86: KVM guest: make kvm_smp_prepare_boot_cpu() static 2008-07-20 12:42:37 +03:00
ldt.c cpumask: Optimize cpumask_of_cpu in arch/x86/kernel/ldt.c 2008-07-18 22:02:58 +02:00
machine_kexec_32.c Merge branch 'auto-ftrace-next' into tracing/for-linus 2008-07-14 16:11:52 +02:00
machine_kexec_64.c Merge branch 'auto-ftrace-next' into tracing/for-linus 2008-07-14 16:11:52 +02:00
Makefile Merge branch 'x86/paravirt-spinlocks' into x86/for-linus 2008-07-21 16:45:56 +02:00
mca_32.c
mfgpt_32.c geode: fix modular build 2008-06-12 21:25:51 +02:00
microcode.c Merge branch 'cpus4096-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-07-23 18:37:44 -07:00
mmconf-fam10h_64.c x86: move mmconfig declarations to header 2008-05-30 15:45:17 -07:00
module_32.c
module_64.c PAGE_ALIGN(): correctly handle 64-bit values on 32-bit architectures 2008-07-24 10:47:21 -07:00
mpparse.c x86: extend and use x86_quirks to clean up NUMAQ code 2008-07-20 09:25:52 +02:00
msr.c device create: x86: convert device_create to device_create_drvdata 2008-07-21 21:54:46 -07:00
nmi.c Merge branches 'x86/urgent', 'x86/amd-iommu', 'x86/apic', 'x86/cleanups', 'x86/core', 'x86/cpu', 'x86/fixmap', 'x86/gart', 'x86/kprobes', 'x86/memtest', 'x86/modules', 'x86/nmi', 'x86/pat', 'x86/reboot', 'x86/setup', 'x86/step', 'x86/unify-pci', 'x86/uv', 'x86/xen' and 'xen-64bit' into x86/for-linus 2008-07-21 16:37:17 +02:00
numaq_32.c x86: add ->pre_time_init to x86_quirks 2008-07-20 09:25:52 +02:00
olpc.c x86: olpc: add One Laptop Per Child architecture support 2008-04-29 08:06:07 -07:00
paravirt_patch_32.c x86/paravirt: split sysret and sysexit 2008-07-08 13:13:15 +02:00
paravirt_patch_64.c x86/paravirt: add sysret/sysexit pvops for returning to 32-bit compatibility userspace 2008-07-08 13:15:52 +02:00
paravirt.c x86: fix pte_flags() to only return flags, fix lguest (updated) 2008-07-22 10:41:18 +02:00
pci-calgary_64.c calgary iommu: use the first kernels TCE tables in kdump 2008-07-25 10:53:41 -07:00
pci-dma.c driver core: fix a lot of printk usages of bus_id 2008-07-21 21:54:53 -07:00
pci-gart_64.c driver core: fix a lot of printk usages of bus_id 2008-07-21 21:54:53 -07:00
pci-nommu.c x86: make only GART code include gart.h 2008-07-11 11:00:54 +02:00
pci-swiotlb_64.c x86: make only GART code include gart.h 2008-07-11 11:00:54 +02:00
pcspeaker.c
pmtimer_64.c
probe_roms_32.c x86: seperate probe_roms into another file 2008-07-08 12:50:05 +02:00
process_32.c Merge branch 'linus' into timers/nohz 2008-07-18 19:53:16 +02:00
process_64.c Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-07-24 12:55:01 -07:00
process.c Merge branches 'x86/urgent', 'x86/amd-iommu', 'x86/apic', 'x86/cleanups', 'x86/core', 'x86/cpu', 'x86/fixmap', 'x86/gart', 'x86/kprobes', 'x86/memtest', 'x86/modules', 'x86/nmi', 'x86/pat', 'x86/reboot', 'x86/setup', 'x86/step', 'x86/unify-pci', 'x86/uv', 'x86/xen' and 'xen-64bit' into x86/for-linus 2008-07-21 16:37:17 +02:00
ptrace.c x86 ptrace: user-sets-TF nits 2008-07-16 12:15:17 -07:00
pvclock.c x86: Add structs and functions for paravirt clocksource 2008-06-24 21:02:31 +03:00
quirks.c Merge branch 'timers/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-07-15 10:39:57 -07:00
reboot_fixups_32.c x86: constify data in reboot.c 2008-05-25 08:58:30 +02:00
reboot.c Merge branch 'cpus4096-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-07-23 18:37:44 -07:00
relocate_kernel_32.S
relocate_kernel_64.S
rtc.c provide rtc_cmos platform device 2008-06-12 18:05:42 -07:00
scx200_32.c
setup_percpu.c x86: convert Dprintk to pr_debug 2008-07-21 21:35:38 +02:00
setup.c x86: call early_cpu_init at the same point 2008-07-24 12:28:11 +02:00
sigframe.h
signal_32.c Merge branch 'sched/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-07-23 19:36:53 -07:00
signal_64.c x64, fpu: fix possible FPU leakage in error conditions 2008-07-26 16:37:04 +02:00
smp.c generic-ipi: fixlet 2008-07-06 14:01:50 +02:00
smpboot.c Merge branch 'cpus4096-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-07-23 18:37:44 -07:00
smpcommon.c x86: convert to generic helpers for IPI function calls 2008-06-26 11:21:54 +02:00
stacktrace.c stacktrace: fix modular build, export print_stack_trace and save_stack_trace 2008-06-30 09:20:55 +02:00
step.c x86 ptrace: user-sets-TF nits 2008-07-16 12:15:17 -07:00
summit_32.c x86: make generic arch support NUMAQ 2008-06-10 11:34:42 +02:00
sys_i386_32.c x86: coding style fixes to arch/x86/kernel/sys_i386_32.c 2008-06-10 12:34:54 +02:00
sys_x86_64.c unified (weak) sys_pipe implementation 2008-05-03 13:50:33 -07:00
syscall_64.c
syscall_table_32.S flag parameters add-on: remove epoll_create size param 2008-07-24 10:47:29 -07:00
tce_64.c
test_nx.c
test_rodata.c
time_32.c x86: add ->pre_time_init to x86_quirks 2008-07-20 09:25:52 +02:00
time_64.c x86: merge tsc_init and clocksource code 2008-07-09 07:43:27 +02:00
tlb_32.c on_each_cpu(): kill unused 'retry' parameter 2008-06-26 11:24:38 +02:00
tlb_64.c Merge branch 'generic-ipi' into generic-ipi-for-linus 2008-07-15 21:55:59 +02:00
tlb_uv.c x86, SGI UV: uv_ptc_proc_write fix 2008-07-08 12:23:31 +02:00
tls.c
tls.h
topology.c
trampoline_32.S
trampoline_64.S
trampoline.c x86: extend e820 ealy_res support 32bit 2008-05-25 10:55:11 +02:00
traps_32.c x86: introducing asm-x86/traps.h 2008-07-18 18:51:57 +02:00
traps_64.c x64, fpu: fix possible FPU leakage in error conditions 2008-07-26 16:37:04 +02:00
tsc_sync.c
tsc.c x86: fix TSC build error on 32bit 2008-07-15 22:46:47 +02:00
verify_cpu_64.S
visws_quirks.c x86: introduce x86_quirks 2008-07-20 09:18:17 +02:00
vm86_32.c
vmi_32.c x86: APIC: remove apic_write_around(); use alternatives 2008-07-18 12:51:21 +02:00
vmiclock_32.c x86: rename paravirtualized TSC functions 2008-07-09 07:43:28 +02:00
vmlinux_32.lds.S Merge branch 'core/rodata' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-07-14 15:28:10 -07:00
vmlinux_64.lds.S Merge branch 'core/rodata' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-07-14 15:28:10 -07:00
vmlinux.lds.S
vsmp_64.c x86: vsmp_64 add missing includes 2008-05-25 08:58:24 +02:00
vsyscall_64.c Merge branch 'generic-ipi' into generic-ipi-for-linus 2008-07-15 21:55:59 +02:00
x8664_ksyms_64.c Merge branch 'auto-ftrace-next' into tracing/for-linus 2008-07-14 16:11:52 +02:00