AuxXxilium/linux_dsm_epyc7002
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1204e35bed
linux_dsm_epyc7002/drivers/pci/hotplug
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Lukas Wunner 1204e35bed PCI: pciehp: Fix unprotected list iteration in IRQ handler 
Commit b440bde74f ("PCI: Add pci_ignore_hotplug() to ignore hotplug
events for a device") iterates over the devices on a hotplug port's
subordinate bus in pciehp's IRQ handler without acquiring pci_bus_sem.
It is thus possible for a user to cause a crash by concurrently
manipulating the device list, e.g. by disabling slot power via sysfs
on a different CPU or by initiating a remove/rescan via sysfs.

This can't be fixed by acquiring pci_bus_sem because it may sleep.
The simplest fix is to avoid the list iteration altogether and just
check the ignore_hotplug flag on the port itself.  This works because
pci_ignore_hotplug() sets the flag both on the device as well as on its
parent bridge.

We do lose the ability to print the name of the device blocking hotplug
in the debug message, but that's probably bearable.

Fixes: b440bde74f ("PCI: Add pci_ignore_hotplug() to ignore hotplug events for a device")
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: stable@vger.kernel.org
2018-07-23 17:04:10 -05:00
..
acpi_pcihp.c PCI: shpchp: Separate existence of SHPC and permission to use it 2018-06-26 15:38:28 -05:00
acpiphp_core.c PCI: Add SPDX GPL-2.0+ to replace GPL v2 or later boilerplate 2018-01-28 15:49:06 -06:00
acpiphp_glue.c ACPI / hotplug / PCI: Drop unnecessary parentheses 2018-06-04 12:08:06 -05:00
acpiphp_ibm.c More ACPI updates for v4.16-rc1 2018-02-09 09:44:25 -08:00
acpiphp.h PCI: Add SPDX GPL-2.0+ to replace GPL v2 or later boilerplate 2018-01-28 15:49:06 -06:00
cpci_hotplug_core.c PCI: Add SPDX GPL-2.0+ to replace GPL v2 or later boilerplate 2018-01-28 15:49:06 -06:00
cpci_hotplug_pci.c PCI: Add SPDX GPL-2.0+ to replace GPL v2 or later boilerplate 2018-01-28 15:49:06 -06:00
cpci_hotplug.h PCI: Add SPDX GPL-2.0+ to replace GPL v2 or later boilerplate 2018-01-28 15:49:06 -06:00
cpcihp_generic.c PCI: Add SPDX GPL-2.0+ to replace GPL v2 or later boilerplate 2018-01-28 15:49:06 -06:00
cpcihp_zt5550.c PCI: Add SPDX GPL-2.0+ to replace GPL v2 or later boilerplate 2018-01-28 15:49:06 -06:00
cpcihp_zt5550.h PCI: Add SPDX GPL-2.0+ to replace GPL v2 or later boilerplate 2018-01-28 15:49:06 -06:00
cpqphp_core.c Merge branch 'pci/spdx' into next 2018-02-01 11:40:07 -06:00
cpqphp_ctrl.c PCI: cpqphp: Fix possible NULL pointer dereference 2018-02-28 14:35:54 -06:00
cpqphp_nvram.c PCI: Add SPDX GPL-2.0+ to replace GPL v2 or later boilerplate 2018-01-28 15:49:06 -06:00
cpqphp_nvram.h PCI: Add SPDX GPL-2.0+ to replace GPL v2 or later boilerplate 2018-01-28 15:49:06 -06:00
cpqphp_pci.c Merge branch 'pci/spdx' into next 2018-02-01 11:40:07 -06:00
cpqphp_sysfs.c PCI: Add SPDX GPL-2.0+ to replace GPL v2 or later boilerplate 2018-01-28 15:49:06 -06:00
cpqphp.h PCI: Add SPDX GPL-2.0+ to replace GPL v2 or later boilerplate 2018-01-28 15:49:06 -06:00
ibmphp_core.c PCI: ibmphp: Fix use-before-set in get_max_bus_speed() 2018-04-20 12:49:24 -05:00
ibmphp_ebda.c PCI: Add SPDX GPL-2.0+ to replace GPL v2 or later boilerplate 2018-01-28 15:49:06 -06:00
ibmphp_hpc.c PCI: Add SPDX GPL-2.0+ to replace GPL v2 or later boilerplate 2018-01-28 15:49:06 -06:00
ibmphp_pci.c Merge branch 'pci/spdx' into next 2018-02-01 11:40:07 -06:00
ibmphp_res.c Merge branch 'pci/spdx' into next 2018-02-01 11:40:07 -06:00
ibmphp.h PCI: Add SPDX GPL-2.0+ to replace GPL v2 or later boilerplate 2018-01-28 15:49:06 -06:00
Kconfig PCI: shpchp: Convert SHPC to be builtin only 2018-06-02 00:18:28 -05:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pci_hotplug_core.c PCI: hotplug: Don't leak pci_slot on registration failure 2018-07-23 17:04:10 -05:00
pciehp_core.c PCI: pciehp: Fix use-after-free on unplug 2018-07-23 17:04:10 -05:00
pciehp_ctrl.c PCI: Add SPDX GPL-2.0+ to replace GPL v2 or later boilerplate 2018-01-28 15:49:06 -06:00
pciehp_hpc.c PCI: pciehp: Fix unprotected list iteration in IRQ handler 2018-07-23 17:04:10 -05:00
pciehp_pci.c Merge branch 'pci/spdx' into next 2018-02-01 11:40:07 -06:00
pciehp.h PCI: pciehp: Fix use-after-free on unplug 2018-07-23 17:04:10 -05:00
pnv_php.c PCI: pnv_php: Add missing of_node_put() 2018-05-23 16:48:37 -05:00
rpadlpar_core.c pci-v4.16-changes 2018-02-06 09:59:40 -08:00
rpadlpar_sysfs.c pci-v4.16-changes 2018-02-06 09:59:40 -08:00
rpadlpar.h PCI: Add SPDX GPL-2.0+ to replace GPL v2 or later boilerplate 2018-01-28 15:49:06 -06:00
rpaphp_core.c pci-v4.16-changes 2018-02-06 09:59:40 -08:00
rpaphp_pci.c PCI: Add SPDX GPL-2.0+ to replace GPL v2 or later boilerplate 2018-01-28 15:49:06 -06:00
rpaphp_slot.c PCI: Add SPDX GPL-2.0+ to replace GPL v2 or later boilerplate 2018-01-28 15:49:06 -06:00
rpaphp.h pci-v4.16-changes 2018-02-06 09:59:40 -08:00
s390_pci_hpc.c PCI: Add SPDX GPL-2.0+ to replace implicit GPL v2 or later statement 2018-01-29 18:23:07 -06:00
sgi_hotplug.c Merge branch 'pci/spdx' into next 2018-02-01 11:40:07 -06:00
shpchp_core.c PCI: shpchp: Separate existence of SHPC and permission to use it 2018-06-26 15:38:28 -05:00
shpchp_ctrl.c PCI: shpchp: Fix AMD POGO identification 2018-06-04 12:07:31 -05:00
shpchp_hpc.c PCI: Add SPDX GPL-2.0+ to replace GPL v2 or later boilerplate 2018-01-28 15:49:06 -06:00
shpchp_pci.c Merge branch 'pci/spdx' into next 2018-02-01 11:40:07 -06:00
shpchp_sysfs.c PCI: Add SPDX GPL-2.0+ to replace GPL v2 or later boilerplate 2018-01-28 15:49:06 -06:00
shpchp.h PCI: shpchp: Add shpchp_is_native() 2018-06-04 12:08:06 -05:00