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alistair23-linux/arch/powerpc/platforms/powernv
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David Hildenbrand a89b91fcb0 powerpc/powernv/memtrace: Fix crashing the kernel when enabling concurrently 
commit d6718941a2 upstream.

It's very easy to crash the kernel right now by simply trying to
enable memtrace concurrently, hammering on the "enable" interface

loop.sh:
  #!/bin/bash

  dmesg --console-off

  while true; do
          echo 0x40000000 > /sys/kernel/debug/powerpc/memtrace/enable
  done

[root@localhost ~]# loop.sh &
[root@localhost ~]# loop.sh &

Resulting quickly in a kernel crash. Let's properly protect using a
mutex.

Fixes: 9d5171a8f2 ("powerpc/powernv: Enable removal of memory for in memory tracing")
Cc: stable@vger.kernel.org# v4.14+
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201111145322.15793-3-david@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2020-12-30 11:51:39 +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 powerpc/powernv/memtrace: Fix crashing the kernel when enabling concurrently 2020-12-30 11:51:39 +01:00
npu-dma.c powerpc/powernv/npu: Do not attempt NPU2 setup on POWER8NVL NPU 2020-12-30 11:51:39 +01:00
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/powernv: Fix memory corruption when saving SLB entries on MCE 2020-12-11 13:23:30 +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