In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
PCI: Allow per function PCI slots to fix slot reset on s390<\/p>\n
On s390 systems, which use a machine level hypervisor, PCI devices are
\nalways accessed through a form of PCI pass-through which fundamentally
\noperates on a per PCI function granularity. This is also reflected in the
\ns390 PCI hotplug driver which creates hotplug slots for individual PCI
\nfunctions. Its reset_slot() function, which is a wrapper for
\nzpci_hot_reset_device(), thus also resets individual functions.<\/p>\n
Currently, the pci_create_slot() assigns the same pci_slot object to
\nmultifunction devices. This approach worked fine on s390 systems that only
\nexposed virtual functions as individual PCI domains to the operating
\nsystem. Since commit 44510d6fa0c0 (“s390\/pci: Handling multifunctions”)
\ns390 supports exposing the topology of multifunction PCI devices by
\ngrouping them in a shared PCI domain. This creates a problem when resetting
\na function through the hotplug driver’s slot_reset() interface.<\/p>\n
When attempting to reset a function through the hotplug driver, the shared
\nslot assignment causes the wrong function to be reset instead of the
\nintended one. It also leaks memory as we do create a pci_slot object for
\nthe function, but don’t correctly free it in pci_slot_release().<\/p>\n
Add a flag for struct pci_slot to allow per function PCI slots for
\nfunctions managed through a hypervisor, which exposes individual PCI
\nfunctions while retaining the topology. Since we can use all 8 bits for
\nslot ‘number’ (for ARI devices), change slot ‘number’ u16 to account for
\nspecial values PCI_SLOT_PLACEHOLDER and PCI_SLOT_ALL_DEVICES.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
PCI: Allow per function PCI slots to fix slot reset on s390<\/p>\n
On s390 systems, which use a machine level hypervisor, PCI devices are<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-24482","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/24482","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=24482"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=24482"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=24482"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}