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linux/arch/powerpc/platforms/pseries
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Vaibhav Jain 0460534b53 powerpc/papr_scm: Limit the readability of 'perf_stats' sysfs attribute 
The newly introduced 'perf_stats' attribute uses the default access
mode of 0444, allowing non-root users to access performance stats of
an nvdimm and potentially force the kernel into issuing a large number
of expensive hypercalls. Since the information exposed by this
attribute cannot be cached it is better to ward off access to this
attribute from users who don't need to access to these performance
statistics.

Hence update the access mode of 'perf_stats' attribute to be only
readable by root users.

Fixes: 2d02bf835e ("powerpc/papr_scm: Fetch nvdimm performance stats from PHYP")
Reported-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200907110540.21349-1-vaibhav@linux.ibm.com
 		2020-09-09 14:44:38 +10:00
..
Kconfig powerpc/pseries: Implement paravirt qspinlocks for SPLPAR 2020-07-27 00:01:29 +10:00
Makefile powerpc/pseries/Makefile: Remove CONFIG_PPC_PSERIES check 2020-02-19 21:07:08 +11:00
cmm.c mm: remove unneeded includes of <asm/pgalloc.h> 2020-08-07 11:33:26 -07:00
dlpar.c powerpc updates for 5.3 2019-07-13 16:08:36 -07:00
dtl.c powerpc64: Break asm/percpu.h vs spinlock_types.h dependency 2020-07-10 12:00:01 +02:00
eeh_pseries.c powerpc/eeh: Move PE tree setup into the platform 2020-07-26 23:34:21 +10:00
event_sources.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
firmware.c powerpc/book3s64/radix: Add kernel command line option to disable radix GTSE 2020-07-29 21:09:37 +10:00
hotplug-cpu.c powerpc/pseries/hotplug-cpu: wait indefinitely for vCPU death 2020-08-18 17:09:52 +10:00
hotplug-memory.c pseries: Fix 64 bit logical memory block panic 2020-07-16 13:12:45 +10:00
hvCall.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
hvCall_inst.c powerpc: pseries: no need to check return value of debugfs_create functions 2019-11-02 18:09:10 +01:00
hvconsole.c powerpc updates for 5.3 2019-07-13 16:08:36 -07:00
hvcserver.c powerpc: Use fallthrough pseudo-keyword 2020-07-29 21:09:37 +10:00
ibmebus.c powerpc/pseries: Make vio and ibmebus initcalls pseries specific 2020-06-02 22:21:31 +10:00
io_event_irq.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
iommu.c powerpc/pseries/ddw: Extend upper limit for huge DMA window for persistent memory 2020-04-03 12:22:47 +11:00
kexec.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
lpar.c powerpc updates for 5.9 2020-08-07 10:33:50 -07:00
lparcfg.c powerpc updates for 5.6 2020-02-04 13:06:46 +00:00
mobility.c powerpc/pseries/mobility: Add pr_debug() for device tree changes 2020-07-30 22:53:49 +10:00
msi.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 441 2019-06-05 17:37:17 +02:00
nvram.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
of_helpers.c powerpc/pseries: Fix of_read_drc_info_cell() to point at next record 2020-03-25 12:06:43 +11:00
of_helpers.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
papr_scm.c powerpc/papr_scm: Limit the readability of 'perf_stats' sysfs attribute 2020-09-09 14:44:38 +10:00
pci.c powerpc/pcidn: Make VF pci_dn management CONFIG_PCI_IOV specific 2020-01-23 21:31:19 +11:00
pci_dlpar.c powerpc/eeh: Remove eeh_dev_phb_init_dynamic() 2020-07-26 23:34:19 +10:00
pmem.c powerpc/pseries: remove cede offline state for CPUs 2020-07-16 13:12:34 +10:00
power.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 167 2019-05-30 11:26:39 -07:00
pseries.h powerpc/pseries: Read TLB Block Invalidate Characteristics 2019-09-24 19:58:42 +10:00
pseries_energy.c powerpc/pseries: Fix drc-info mappings of logical cpus to drc-index 2019-11-13 16:57:57 +11:00
ras.c powerpc/pseries: Do not initiate shutdown when system is running on UPS 2020-08-20 22:55:54 +10:00
reconfig.c proc: convert everything to "struct proc_ops" 2020-02-04 03:05:26 +00:00
rng.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
rtas-fadump.c powerpc: Replace _ALIGN_DOWN() by ALIGN_DOWN() 2020-05-11 23:15:15 +10:00
rtas-fadump.h powerpc/fadump: support holes in kernel boot memory area 2019-09-14 00:04:46 +10:00
scanlog.c proc: convert everything to "struct proc_ops" 2020-02-04 03:05:26 +00:00
setup.c powerpc updates for 5.9 2020-08-07 10:33:50 -07:00
smp.c powerpc/pseries: Add KVM guest doorbell restrictions 2020-07-29 21:02:10 +10:00
suspend.c powerpc/numa: remove start/stop_topology_update() 2020-07-16 13:12:38 +10:00
svm.c powerpc64: Break asm/percpu.h vs spinlock_types.h dependency 2020-07-10 12:00:01 +02:00
vio.c powerpc/pseries: Make vio and ibmebus initcalls pseries specific 2020-06-02 22:21:31 +10:00
vphn.c powerpc/vphn: Check for error from hcall_vphn 2020-03-04 22:44:30 +11:00