CVE-2024-26810

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> vfio/pci: Lock external INTx masking ops<br /> <br /> Mask operations through config space changes to DisINTx may race INTx<br /> configuration changes via ioctl. Create wrappers that add locking for<br /> paths outside of the core interrupt code.<br /> <br /> In particular, irq_type is updated holding igate, therefore testing<br /> is_intx() requires holding igate. For example clearing DisINTx from<br /> config space can otherwise race changes of the interrupt configuration.<br /> <br /> This aligns interfaces which may trigger the INTx eventfd into two<br /> camps, one side serialized by igate and the other only enabled while<br /> INTx is configured. A subsequent patch introduces synchronization for<br /> the latter flows.