Niklas Schnelle ab90950985 PCI: s390: Fix use-after-free of PCI resources with per-function hotplug ... On s390 PCI functions may be hotplugged individually even when they belong to a multi-function device. In particular on an SR-IOV device VFs may be removed and later re-added. In commit a50297cf82 ("s390/pci: separate zbus creation from scanning") it was missed however that struct pci_bus and struct zpci_bus's resource list retained a reference to the PCI functions MMIO resources even though those resources are released and freed on hot-unplug. These stale resources may subsequently be claimed when the PCI function re-appears resulting in use-after-free. One idea of fixing this use-after-free in s390 specific code that was investigated was to simply keep resources around from the moment a PCI function first appeared until the whole virtual PCI bus created for a multi-function device disappears. The problem with this however is that due to the requirement of artificial MMIO addreesses (address cookies) extra logic is then needed to keep the address cookies compatible on re-plug. At the same time the MMIO resources semantically belong to the PCI function so tying their lifecycle to the function seems more logical. Instead a simpler approach is to remove the resources of an individually hot-unplugged PCI function from the PCI bus's resource list while keeping the resources of other PCI functions on the PCI bus untouched. This is done by introducing pci_bus_remove_resource() to remove an individual resource. Similarly the resource also needs to be removed from the struct zpci_bus's resource list. It turns out however, that there is really no need to add the MMIO resources to the struct zpci_bus's resource list at all and instead we can simply use the zpci_bar_struct's resource pointer directly. Fixes: a50297cf82 ("s390/pci: separate zbus creation from scanning") Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com> Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> Link: https://lore.kernel.org/r/20230306151014.60913-2-schnelle@linux.ibm.com Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>		2023-03-13 09:15:11 +01:00
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acpi	Remove Intel compiler support	2023-03-05 10:49:37 -08:00
asm-generic	Driver core changes for 6.3-rc1	2023-02-24 12:58:55 -08:00
clocksource
crypto
drm	Driver core changes for 6.3-rc1	2023-02-24 12:58:55 -08:00
dt-bindings	ARM: SoC drivers for 6.3	2023-02-27 10:04:49 -08:00
keys
kunit
kvm
linux	PCI: s390: Fix use-after-free of PCI resources with per-function hotplug	2023-03-13 09:15:11 +01:00
math-emu
media	media updates for v6.3-rc1	2023-02-26 11:47:26 -08:00
memory
misc
net	netfilter: tproxy: fix deadlock due to missing BH disable	2023-03-06 12:09:48 +01:00
pcmcia
ras
rdma
rv
scsi	SCSI misc on 20230303	2023-03-03 14:41:50 -08:00
soc
sound	sound fixes for 6.3-rc1	2023-03-04 10:53:59 -08:00
target
trace	f2fs-for-6.3-rc1	2023-02-27 16:18:51 -08:00
uapi	for-6.3-rc1-tag	2023-03-10 08:39:13 -08:00
ufs	SCSI misc on 20230303	2023-03-03 14:41:50 -08:00
vdso
video
xen	Driver core changes for 6.3-rc1	2023-02-24 12:58:55 -08:00