Thomas Gleixner a89f040fa3 x86/cpufeatures: Add X86_BUG_CPU_INSECURE ...

Many x86 CPUs leak information to user space due to missing isolation of
user space and kernel space page tables. There are many well documented
ways to exploit that.

The upcoming software migitation of isolating the user and kernel space
page tables needs a misfeature flag so code can be made runtime
conditional.

Add the BUG bits which indicates that the CPU is affected and add a feature
bit which indicates that the software migitation is enabled.

Assume for now that _ALL_ x86 CPUs are affected by this. Exceptions can be
made later.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Laight <David.Laight@aculab.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Eduardo Valentin <eduval@amazon.com>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: aliguori@amazon.com
Cc: daniel.gruss@iaik.tugraz.at
Cc: hughd@google.com
Cc: keescook@google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

2017-12-23 21:12:59 +01:00

..

boot

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

configs

x86/unwind: Rename unwinder config options to 'CONFIG_UNWINDER_*'

2017-10-14 10:12:12 +02:00

crypto

Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6

2017-11-06 09:05:03 -08:00

entry

x86/entry: Rename SYSENTER_stack to CPU_ENTRY_AREA_entry_stack

2017-12-22 20:13:02 +01:00

events

locking/barriers: Convert users of lockless_dereference() to READ_ONCE()

2017-12-17 13:57:15 +01:00

hyperv

x86/virt: Add enum for hypervisors to replace x86_hyper

2017-11-10 10:03:12 +01:00

ia32

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

include

x86/cpufeatures: Add X86_BUG_CPU_INSECURE

2017-12-23 21:12:59 +01:00

kernel

x86/cpufeatures: Add X86_BUG_CPU_INSECURE

2017-12-23 21:12:59 +01:00

kvm

x86/entry: Remap the TSS into the CPU entry area

2017-12-17 13:59:56 +01:00

lib

x86/entry/64: Make cpu_entry_area.tss read-only

2017-12-17 14:27:52 +01:00

math-emu

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

mm

x86/cpu_entry_area: Prevent wraparound in setup_cpu_entry_area_ptes() on 32bit

2017-12-23 20:18:42 +01:00

net

bpf: fix bpf_tail_call() x64 JIT

2017-10-03 16:04:44 -07:00

oprofile

x86/oprofile/ppro: Do not use __this_cpu*() in preemptible context

2017-11-08 13:01:54 +01:00

pci

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

platform

x86/uv: Use the right TLB-flush API

2017-12-22 20:13:02 +01:00

power

x86/entry: Remap the TSS into the CPU entry area

2017-12-17 13:59:56 +01:00

purgatory

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

ras

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

realmode

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

tools

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

um

Merge commit 'upstream-x86-entry' into WIP.x86/mm

2017-12-17 12:58:53 +01:00

video

x86/video: Don't assume all FB devices are PCI devices

2016-03-15 11:08:26 +01:00

xen

x86/cpu_entry_area: Move it out of the fixmap

2017-12-22 20:13:05 +01:00

.gitignore

x86/build: Add arch/x86/purgatory/ make generated files to gitignore

2014-10-09 09:29:46 +02:00

Kbuild

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

2017-09-07 09:25:15 -07:00

Kconfig

x86/Kconfig: Limit NR_CPUS on 32-bit to a sane amount

2017-12-22 20:13:00 +01:00

Kconfig.cpu

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

Kconfig.debug

Merge commit 'upstream-x86-entry' into WIP.x86/mm

2017-12-17 12:58:53 +01:00

Makefile

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

Makefile_32.cpu

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

Makefile.um

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00