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alistair23-linux/arch/powerpc/platforms/powernv
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Nicholas Piggin 9a32a7e78b powerpc/64s: flush L1D after user accesses 
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: Michael Ellerman <mpe@ellerman.id.au>
 		2020-11-19 23:47:18 +11:00
..
Kconfig powerpc/powernv: Move SCOM access code into powernv platform 2019-08-05 18:53:03 +10:00
Makefile powerpc/powernv/sriov: Move SR-IOV into a separate file 2020-07-26 23:34:22 +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/eeh: Clean up PE addressing 2020-10-06 23:22:25 +11:00
idle.c powerpc/powernv/idle: add a basic stop 0-3 driver for POWER10 2020-09-15 22:13:38 +10:00
memtrace.c mm/memory_hotplug: prepare passing flags to add_memory() and friends 2020-10-16 11:11:18 -07:00
npu-dma.c powerpc/powernv/npu: Move IOMMU group setup into npu-dma.c 2020-05-28 23:24:38 +10:00
ocxl.c ocxl: Remove custom service to allocate interrupts 2020-08-25 01:31:31 +10:00
opal-async.c powerpc: Use fallthrough pseudo-keyword 2020-07-29 21:09:37 +10:00
opal-call.c powerpc/powernv: Add OPAL API interface to access secure variable 2019-11-13 00:33:22 +11:00
opal-core.c powerpc/powernv: fix wrong warning message in opalcore_config_init() 2020-09-18 19:59:45 +10:00
opal-dump.c powerpc/powernv/dump: Handle multiple writes to ack attribute 2020-10-19 22:58:52 +11:00
opal-elog.c powerpc/opal_elog: Handle multiple writes to ack attribute 2020-10-16 14:25:12 +11:00
opal-fadump.c powerpc: Replace _ALIGN_DOWN() by ALIGN_DOWN() 2020-05-11 23:15:15 +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: Re-enable imc trace-mode in kernel 2020-04-03 00:09:58 +11:00
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: Include asm/powernv.h from the local powernv.h 2020-08-25 01:31:33 +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 powerpc/powernv: Make some symbols static 2019-11-13 16:58:06 +11:00
opal-prd.c powerpc/powernv: Fix spurious kerneldoc warnings in opal-prd.c 2020-08-25 01:31:33 +10:00
opal-psr.c powerpc/powernv: Make some symbols static 2019-11-13 16:58:06 +11:00
opal-rtc.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
opal-secvar.c powerpc/powernv: Add OPAL API interface to access secure variable 2019-11-13 00:33:22 +11:00
opal-sensor-groups.c powerpc/powernv: Make some symbols static 2019-11-13 16:58:06 +11:00
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: add NULL check after kzalloc 2020-05-20 23:39:56 +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/ioda: Return correct error if TCE level allocation failed 2020-06-22 10:37:59 +10:00
pci-ioda.c powerpc/powernv: Remove set but not used variable 'parent' 2020-08-25 01:31:32 +10:00
pci-sriov.c powerpc/powernv/sriov: Fix use of uninitialised variable 2020-08-03 22:13:13 +10:00
pci.c powerpc/powernv/pci: Add pci_bus_to_pnvhb() helper 2020-07-26 23:34:21 +10:00
pci.h powerpc/powernv/pci.h: delete duplicated word 2020-07-27 00:01:32 +10:00
powernv.h powerpc/powernv: Include asm/powernv.h from the local powernv.h 2020-08-25 01:31:33 +10:00
rng.c powerpc/powernv: Staticify functions without prototypes 2020-08-25 01:31:33 +10:00
setup.c powerpc/64s: flush L1D after user accesses 2020-11-19 23:47:18 +11:00
smp.c powerpc/smp: Move ppc_md.cpu_die() to smp_ops.cpu_offline_self() 2020-09-18 19:59:43 +10:00
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-api.c powerpc/vas: Add VAS user space API 2020-04-20 16:53:14 +10:00
vas-debug.c powerpc/vas: Take reference to PID and mm for user space windows 2020-04-20 16:53:00 +10:00
vas-fault.c powerpc/vas: Report proper error code for address translation failure 2020-07-15 23:09:55 +10:00
vas-trace.h powerpc/vas: Add a couple of trace points 2018-03-14 20:13:58 +11:00
vas-window.c powerpc/powernv: Staticify functions without prototypes 2020-08-25 01:31:33 +10:00
vas.c powerpc/vas: Setup thread IRQ handler per VAS instance 2020-04-20 16:53:00 +10:00
vas.h powerpc/vas: Add VAS user space API 2020-04-20 16:53:14 +10:00