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Borislav Petkov c9fc3f778a x86, microcode: Sanitize per-cpu microcode reloading interface 
Microcode reloading in a per-core manner is a very bad idea for both
major x86 vendors. And the thing is, we have such interface with which
we can end up with different microcode versions applied on different
cores of an otherwise homogeneous wrt (family,model,stepping) system.

So turn off the possibility of doing that per core and allow it only
system-wide.

This is a minimal fix which we'd like to see in stable too thus the
more-or-less arbitrary decision to allow system-wide reloading only on
the BSP:

$ echo 1 > /sys/devices/system/cpu/cpu0/microcode/reload
...

and disable the interface on the other cores:

$ echo 1 > /sys/devices/system/cpu/cpu23/microcode/reload
-bash: echo: write error: Invalid argument

Also, allowing the reload only from one CPU (the BSP in
that case) doesn't allow the reload procedure to degenerate
into an O(n^2) deal when triggering reloads from all
/sys/devices/system/cpu/cpuX/microcode/reload sysfs nodes
simultaneously.

A more generic fix will follow.

Cc: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
Link: http://lkml.kernel.org/r/1340280437-7718-2-git-send-email-bp@amd64.org
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: <stable@vger.kernel.org>
2012-07-01 10:24:05 -07:00
..
acpi ACPI: Add a quirk for "AMILO PRO V2030" to ignore the timer overriding 2012-06-11 17:29:44 -04:00
apic x86/ioapic: Fix NULL pointer dereference on CPU hotplug after disabling irqs 2012-06-06 12:03:25 +02:00
cpu x86, cpufeature: Remove stray %s, add -w to mkcapflags.pl 2012-06-26 08:02:48 -07:00
.gitignore
alternative.c
amd_gart_64.c X86 & IA64: adapt for dma_map_ops changes 2012-03-28 16:36:31 +02:00
amd_nb.c
apb_timer.c
aperture_64.c x86/gart: Fix kmemleak warning 2012-06-06 11:58:38 +02:00
apm_32.c x86: Use kick_all_cpus_sync() 2012-05-08 12:35:06 +02:00
asm-offsets.c
asm-offsets_32.c
asm-offsets_64.c
audit_64.c
bootflag.c
check.c x86: kernel/check.c simple_strtoul cleanup 2012-05-15 15:36:41 -07:00
cpuid.c Disintegrate asm/system.h for X86 2012-03-28 18:11:12 +01:00
crash.c
crash_dump_32.c x86: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:15 +08:00
crash_dump_64.c
devicetree.c
doublefault_32.c
dumpstack.c Merge branches 'x86-asm-for-linus', 'x86-cleanups-for-linus', 'x86-cpu-for-linus', 'x86-debug-for-linus' and 'x86-microcode-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-05-23 10:09:50 -07:00
dumpstack_32.c x86: Avoid double stack traces with show_regs() 2012-05-09 11:44:42 +02:00
dumpstack_64.c x86: Avoid double stack traces with show_regs() 2012-05-09 11:44:42 +02:00
e820.c x86: print e820 physical addresses consistently with other parts of kernel 2012-05-29 16:22:20 -07:00
early-quirks.c
early_printk.c
entry_32.S x86: get rid of calling do_notify_resume() when returning to kernel mode 2012-06-01 13:01:51 -04:00
entry_64.S ftrace/x86: Do not change stacks in DEBUG when calling lockdep 2012-05-31 23:12:22 -04:00
ftrace.c ftrace: Use breakpoint method to update ftrace caller 2012-05-31 23:12:19 -04:00
head.c
head32.c x86, realmode: Move ACPI wakeup to unified realmode code 2012-05-08 11:46:05 -07:00
head64.c x86, realmode: Move ACPI wakeup to unified realmode code 2012-05-08 11:46:05 -07:00
head_32.S Merge branch 'x86-trampoline-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-05-29 20:14:53 -07:00
head_64.S Merge branch 'x86-trampoline-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-05-29 20:14:53 -07:00
hpet.c x86: hpet: Fix copy-and-paste mistake in earlier change 2012-05-25 15:32:29 +02:00
hw_breakpoint.c
i386_ksyms_32.c
i387.c x86: replace percpu_xxx funcs with this_cpu_xxx 2012-05-14 14:15:31 -07:00
i8237.c
i8253.c
i8259.c Disintegrate asm/system.h for X86 2012-03-28 18:11:12 +01:00
io_delay.c
ioport.c
irq.c x86: Preserve lazy irq disable semantics in fixup_irqs() 2012-03-29 15:28:47 +02:00
irq_32.c x86: Use common threadinfo allocator 2012-05-08 14:08:44 +02:00
irq_64.c
irq_work.c
irqinit.c Merge branch 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-03-29 18:21:35 -07:00
jump_label.c
kdebugfs.c simple_open: automatically convert to simple_open() 2012-04-05 15:25:50 -07:00
kgdb.c x86: Fix kernel-doc warnings 2012-06-18 10:53:18 +02:00
kprobes-common.h x86/kprobes: Split out optprobe related code to kprobes-opt.c 2012-03-06 09:49:49 +01:00
kprobes-opt.c x86/kprobes: Split out optprobe related code to kprobes-opt.c 2012-03-06 09:49:49 +01:00
kprobes.c x86: Avoid double stack traces with show_regs() 2012-05-09 11:44:42 +02:00
kvm.c KVM: Do not take reference to mm during async #PF 2012-05-06 15:00:02 +03:00
kvmclock.c x86: kvmclock: remove check_and_clear_guest_paused warning 2012-06-11 23:18:33 -03:00
ldt.c Disintegrate asm/system.h for X86 2012-03-28 18:11:12 +01:00
machine_kexec_32.c Disintegrate asm/system.h for X86 2012-03-28 18:11:12 +01:00
machine_kexec_64.c
Makefile Merge branch 'x86-trampoline-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-05-29 20:14:53 -07:00
microcode_amd.c x86, microcode: Ensure that module is only loaded on supported AMD CPUs 2012-04-13 11:51:05 +02:00
microcode_core.c x86, microcode: Sanitize per-cpu microcode reloading interface 2012-07-01 10:24:05 -07:00
microcode_intel.c x86/microcode: Ensure that module is only loaded on supported Intel CPUs 2012-05-07 14:37:14 +02:00
mmconf-fam10h_64.c
module.c Disintegrate asm/system.h for X86 2012-03-28 18:11:12 +01:00
mpparse.c Merge branch 'x86-trampoline-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-05-29 20:14:53 -07:00
msr.c Disintegrate asm/system.h for X86 2012-03-28 18:11:12 +01:00
nmi.c x86: Reset the debug_stack update counter 2012-05-31 23:12:20 -04:00
nmi_selftest.c x86/nmi: Fix section mismatch warnings on 32-bit 2012-06-08 12:19:27 +02:00
paravirt-spinlocks.c
paravirt.c x86: replace percpu_xxx funcs with this_cpu_xxx 2012-05-14 14:15:31 -07:00
paravirt_patch_32.c
paravirt_patch_64.c
pci-calgary_64.c Merge branches 'x86-asm-for-linus', 'x86-cleanups-for-linus', 'x86-cpu-for-linus', 'x86-debug-for-linus' and 'x86-microcode-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-05-23 10:09:50 -07:00
pci-dma.c x86: dma-mapping: fix broken allocation when dma_mask has been provided 2012-06-14 14:01:30 +02:00
pci-iommu_table.c
pci-nommu.c X86: integrate CMA with DMA-mapping subsystem 2012-05-21 15:09:38 +02:00
pci-swiotlb.c X86 & IA64: adapt for dma_map_ops changes 2012-03-28 16:36:31 +02:00
pcspeaker.c
probe_roms.c x86: Include probe_roms.h in probe_roms.c 2012-03-08 10:57:35 +01:00
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
process_32.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
process_64.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
ptrace.c x86, x32, ptrace: Remove PTRACE_ARCH_PRCTL for x32 2012-06-01 13:54:21 -07:00
pvclock.c
quirks.c
reboot.c Merge branches 'acpi_pad-bugzilla-42981', 'apei-bugzilla-43282', 'video-bugzilla-43168', 'bugzilla-40002' and 'bugfix-misc' into release 2012-06-30 00:53:50 -04:00
reboot_fixups_32.c
relocate_kernel_32.S
relocate_kernel_64.S
resource.c
rtc.c
setup.c Merge branch 'x86-trampoline-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-05-29 20:14:53 -07:00
setup_percpu.c percpu, x86: don't use PMD_SIZE as embedded atom_size on 32bit 2012-05-08 09:42:18 -07:00
signal.c x86: get rid of calling do_notify_resume() when returning to kernel mode 2012-06-01 13:01:51 -04:00
smp.c x86/reboot: Update nonmi_ipi parameter 2012-05-14 11:49:38 +02:00
smpboot.c Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-06-15 16:59:19 -07:00
stacktrace.c
step.c
sys_i386_32.c
sys_x86_64.c Merge branch 'x86-x32-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-03-29 18:12:23 -07:00
syscall_32.c
syscall_64.c
tboot.c x86, realmode: fixes compilation issue in tboot.c 2012-05-08 15:04:27 -07:00
tce_64.c Disintegrate asm/system.h for X86 2012-03-28 18:11:12 +01:00
test_nx.c
test_rodata.c x86, extable: Remove open-coded exception table entries in arch/x86/kernel/test_rodata.c 2012-04-20 13:51:38 -07:00
time.c MCA: delete all remaining traces of microchannel bus support. 2012-05-17 19:06:13 -04:00
tls.c Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-03-29 14:28:26 -07:00
tls.h
topology.c
traps.c ftrace: Synchronize variable setting with breakpoints 2012-05-31 23:12:17 -04:00
tsc.c Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-03-29 14:16:48 -07:00
tsc_sync.c
uprobes.c uprobes/core: Handle breakpoint and singlestep exceptions 2012-03-14 07:41:36 +01:00
verify_cpu.S
vm86_32.c Merge branch 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-03-29 18:21:35 -07:00
vmlinux.lds.S x86, realmode: Move ACPI wakeup to unified realmode code 2012-05-08 11:46:05 -07:00
vsmp_64.c x86/vsmp: Fix number of CPUs when vsmp is disabled 2012-05-14 14:42:33 +02:00
vsyscall_64.c x86: vsyscall: Use NULL instead 0 for a pointer argument 2012-04-06 11:49:59 +02:00
vsyscall_emu_64.S
vsyscall_trace.h
x86_init.c x86/apic: Replace io_apic_ops with x86_io_apic_ops. 2012-05-01 14:50:09 -04:00
x8664_ksyms_64.c
xsave.c x86, xsave: remove thread_has_fpu() bug check in __sanitize_i387_state() 2012-05-16 15:17:17 -07:00