In the Linux kernel, the following vulnerability has been resolved:
vfio/platform: Create persistent IRQ handlers
The vfio-platform SET_IRQS ioctl currently allows loopback triggering of
an interrupt before a signaling eventfd has been configured by the user,
which thereby allows a NULL pointer dereference.
Rather than register the IRQ relative to a valid trigger, register all
IRQs in a disabled state in the device open path. This allows mask
operations on the IRQ to nest within the overall enable state governed
by a valid eventfd signal. This decouples @masked, protected by the
@locked spinlock from @trigger, protected via the @igate mutex.
In doing so, it's guaranteed that changes to @trigger cannot race the
IRQ handlers because the IRQ handler is synchronously disabled before
modifying the trigger, and loopback triggering of the IRQ via ioctl is
safe due to serialization with trigger changes via igate.
For compatibility, request_irq() failures are maintained to be local to
the SET_IRQS ioctl rather than a fatal error in the open device path.
This allows, for example, a userspace driver with polling mode support
to continue to work regardless of moving the request_irq() call site.
This necessarily blocks all SET_IRQS access to the failed index.
Metrics
Affected Vendors & Products
References
History
Thu, 12 Sep 2024 08:30:00 +0000
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MITRE
Status: PUBLISHED
Assigner: Linux
Published: 2024-04-05T08:24:43.279Z
Updated: 2024-09-11T17:33:44.149Z
Reserved: 2024-02-19T14:20:24.180Z
Link: CVE-2024-26813
Vulnrichment
Updated: 2024-08-02T00:14:13.615Z
NVD
Status : Awaiting Analysis
Published: 2024-04-05T09:15:09.340
Modified: 2024-06-25T22:15:23.350
Link: CVE-2024-26813
Redhat