CVE-2024-35843

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> iommu/vt-d: Use device rbtree in iopf reporting path<br /> <br /> The existing I/O page fault handler currently locates the PCI device by<br /> calling pci_get_domain_bus_and_slot(). This function searches the list<br /> of all PCI devices until the desired device is found. To improve lookup<br /> efficiency, replace it with device_rbtree_find() to search the device<br /> within the probed device rbtree.<br /> <br /> The I/O page fault is initiated by the device, which does not have any<br /> synchronization mechanism with the software to ensure that the device<br /> stays in the probed device tree. Theoretically, a device could be released<br /> by the IOMMU subsystem after device_rbtree_find() and before<br /> iopf_get_dev_fault_param(), which would cause a use-after-free problem.<br /> <br /> Add a mutex to synchronize the I/O page fault reporting path and the IOMMU<br /> release device path. This lock doesn&amp;#39;t introduce any performance overhead,<br /> as the conflict between I/O page fault reporting and device releasing is<br /> very rare.