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alistair23-linux/arch/powerpc/platforms/powernv
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Nicholas Piggin 09495b5f7a powerpc/64s: flush L1D after user accesses 
commit 9a32a7e78b upstream.

IBM Power9 processors can speculatively operate on data in the L1 cache
before it has been completely validated, via a way-prediction mechanism. It
is not possible for an attacker to determine the contents of impermissible
memory using this method, since these systems implement a combination of
hardware and software security measures to prevent scenarios where
protected data could be leaked.

However these measures don't address the scenario where an attacker induces
the operating system to speculatively execute instructions using data that
the attacker controls. This can be used for example to speculatively bypass
"kernel user access prevention" techniques, as discovered by Anthony
Steinhauser of Google's Safeside Project. This is not an attack by itself,
but there is a possibility it could be used in conjunction with
side-channels or other weaknesses in the privileged code to construct an
attack.

This issue can be mitigated by flushing the L1 cache between privilege
boundaries of concern. This patch flushes the L1 cache after user accesses.

This is part of the fix for CVE-2020-4788.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2020-11-22 10:14:10 +01:00
..
Kconfig powerpc/powernv: Move SCOM access code into powernv platform 2019-08-05 18:53:03 +10:00
Makefile powerpc/opalcore: export /sys/firmware/opal/core for analysing opal crashes 2019-09-14 00:04:45 +10:00
copy-paste.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
eeh-powernv.c powerpc/powernv/eeh: Fix oops when probing cxl devices 2019-10-25 22:08:50 +11:00
idle.c powerpc/powernv: Access LDBAR only if ultravisor disabled 2019-08-30 09:40:16 +10:00
memtrace.c mm/memory_hotplug: rename walk_memory_range() and pass start+size instead of pfns 2019-07-18 17:08:06 -07:00
npu-dma.c powerpc/powernv: Fix build with IOMMU_API=n 2019-09-14 00:03:00 +10:00
ocxl.c ocxl: Rename pnv_ocxl_spa_remove_pe to clarify it's action 2018-06-03 20:40:32 +10:00
opal-async.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
opal-call.c powerpc/opal: add MPIPL interface definitions 2019-09-14 00:04:43 +10:00
opal-core.c powerpc/opalcore: provide an option to invalidate /sys/firmware/opal/core file 2019-09-14 00:04:45 +10:00
opal-dump.c powerpc/powernv/dump: Fix race while processing OPAL dump 2020-10-29 09:58:00 +01:00
opal-elog.c powerpc/powernv/elog: Fix race while processing OPAL error log event. 2020-11-05 11:43:31 +01:00
opal-fadump.c powerpc/fadump: support holes in kernel boot memory area 2019-09-14 00:04:46 +10:00
opal-fadump.h powerpc/fadump: support holes in kernel boot memory area 2019-09-14 00:04:46 +10:00
opal-flash.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
opal-hmi.c powerpc/powernv: Show checkstop reason for NPU2 HMIs 2019-06-02 19:39:36 +10:00
opal-imc.c powerpc/powernv: Avoid re-registration of imc debugfs directory 2020-06-07 13:18:49 +02:00
opal-irqchip.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
opal-kmsg.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
opal-lpc.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
opal-memory-errors.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
opal-msglog.c powerpc/powernv/opal-msglog: Refactor memcons code 2019-08-30 09:40:16 +10:00
opal-nvram.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
opal-power.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
opal-powercap.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
opal-prd.c powerpc/powernv: Add new opal message type 2019-09-12 09:27:00 +10:00
opal-psr.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
opal-rtc.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
opal-sensor-groups.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
opal-sensor.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
opal-sysparam.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
opal-tracepoints.c jump_label: move 'asm goto' support test to Kconfig 2019-01-06 09:46:51 +09:00
opal-wrappers.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
opal-xscom.c powerpc/powernv: Fix checkpatch warnings in opal-xscom.c 2019-08-05 18:53:03 +10:00
opal.c powerpc/powernv: Enhance opal message read interface 2019-09-12 09:27:00 +10:00
pci-cxl.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
pci-ioda-tce.c powerpc/powernv/ioda2: Allocate TCE table levels on demand for default DMA window 2019-08-19 13:20:23 +10:00
pci-ioda.c powerpc/iov: Move VF pdev fixup into pcibios_fixup_iov() 2020-02-24 08:36:30 +01:00
pci.c powerpc/iov: Move VF pdev fixup into pcibios_fixup_iov() 2020-02-24 08:36:30 +01:00
pci.h powerpc/powernv/ioda2: Allocate TCE table levels on demand for default DMA window 2019-08-19 13:20:23 +10:00
powernv.h powerpc/powernv: Add ultravisor message log interface 2019-08-30 09:40:16 +10:00
rng.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
setup.c powerpc/64s: flush L1D after user accesses 2020-11-22 10:14:10 +01:00
smp.c powerpc/powernv/smp: Fix spurious DBG() warning 2020-11-05 11:43:13 +01:00
subcore-asm.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
subcore.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
subcore.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
ultravisor.c powerpc/powernv: Add ultravisor message log interface 2019-08-30 09:40:16 +10:00
vas-debug.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
vas-trace.h powerpc/vas: Add a couple of trace points 2018-03-14 20:13:58 +11:00
vas-window.c powerpc updates for 5.3 2019-07-13 16:08:36 -07:00
vas.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
vas.h powerpc updates for 5.3 2019-07-13 16:08:36 -07:00