CVE-2024-26812
Assigner: Linux
Published: 2024-04-05T08:24:42.627Z
State: PUBLISHED
descriptions: value: In the Linux kernel, the following vulnerability has been resolved:

vfio/pci: Create persistent INTx handler

A vulnerability exists where the eventfd for INTx signaling can be
deconfigured, which unregisters the IRQ handler but still allows
eventfds to be signaled with a NULL context through the SET_IRQS ioctl
or through unmask irqfd if the device interrupt is pending.

Ideally this could be solved with some additional locking; the igate
mutex serializes the ioctl and config space accesses, and the interrupt
handler is unregistered relative to the trigger, but the irqfd path
runs asynchronous to those.  The igate mutex cannot be acquired from the
atomic context of the eventfd wake function.  Disabling the irqfd
relative to the eventfd registration is potentially incompatible with
existing userspace.

As a result, the solution implemented here moves configuration of the
INTx interrupt handler to track the lifetime of the INTx context object
and irq_type configuration, rather than registration of a particular
trigger eventfd.  Synchronization is added between the ioctl path and
eventfd_signal() wrapper such that the eventfd trigger can be
dynamically updated relative to in-flight interrupts or irqfd callbacks.
affected: product: Linux
vendor: Linux
defaultStatus: unaffected
repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
versions: version: 89e1f7d4c66d
lessThan: b18fa894d615
status: affected
versionType: git
version: 89e1f7d4c66d
lessThan: 27d40bf72dd9
status: affected
versionType: git
version: 89e1f7d4c66d
lessThan: 4cb0d7532126
status: affected
versionType: git
version: 89e1f7d4c66d
lessThan: 7d29d4c72c1e
status: affected
versionType: git
version: 89e1f7d4c66d
lessThan: 69276a555c74
status: affected
versionType: git
version: 89e1f7d4c66d
lessThan: 4c089cefe309
status: affected
versionType: git
version: 89e1f7d4c66d
lessThan: 0e09cf81959d
status: affected
versionType: git
version: 89e1f7d4c66d
lessThan: 18c198c96a81
status: affected
versionType: git
product: Linux
vendor: Linux
defaultStatus: affected
repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
versions: version: 3.6
status: affected
version: 0
lessThan: 3.6
status: unaffected
versionType: custom
version: 5.4.274
lessThanOrEqual: 5.4.*
status: unaffected
versionType: custom
version: 5.10.215
lessThanOrEqual: 5.10.*
status: unaffected
versionType: custom
version: 5.15.154
lessThanOrEqual: 5.15.*
status: unaffected
versionType: custom
version: 6.1.84
lessThanOrEqual: 6.1.*
status: unaffected
versionType: custom
version: 6.6.24
lessThanOrEqual: 6.6.*
status: unaffected
versionType: custom
version: 6.7.12
lessThanOrEqual: 6.7.*
status: unaffected
versionType: custom
version: 6.8.3
lessThanOrEqual: 6.8.*
status: unaffected
versionType: custom
version: 6.9
lessThanOrEqual: *
status: unaffected
versionType: original_commit_for_fix
title: vfio/pci: Create persistent INTx handler
x_generator: engine: bippy-d175d3acf727