Vulnerability CVE-2024-26810
Published: 2024-04-05

Description:
In the Linux kernel, the following vulnerability has been resolved:

vfio/pci: Lock external INTx masking ops

Mask operations through config space changes to DisINTx may race INTx
configuration changes via ioctl. Create wrappers that add locking for
paths outside of the core interrupt code.

In particular, irq_type is updated holding igate, therefore testing
is_intx() requires holding igate. For example clearing DisINTx from
config space can otherwise race changes of the interrupt configuration.

This aligns interfaces which may trigger the INTx eventfd into two
camps, one side serialized by igate and the other only enabled while
INTx is configured. A subsequent patch introduces synchronization for
the latter flows.

 References:
https://git.kernel.org/stable/c/3fe0ac10bd117df847c93408a9d428a453cd60e5
https://git.kernel.org/stable/c/04a4a017b9ffd7b0f427b8c376688d14cb614651
https://git.kernel.org/stable/c/6fe478d855b20ac1eb5da724afe16af5a2aaaa40
https://git.kernel.org/stable/c/03505e3344b0576fd619416793a31eae9c5b73bf
https://git.kernel.org/stable/c/810cd4bb53456d0503cc4e7934e063835152c1b7
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