CVE-2024-35843: iommu/vt-d: Use device rbtree in iopf reporting path
First published: Fri May 17 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Use device rbtree in iopf reporting path The existing I/O page fault handler currently locates the PCI device by calling pci_get_domain_bus_and_slot(). This function searches the list of all PCI devices until the desired device is found. To improve lookup efficiency, replace it with device_rbtree_find() to search the device within the probed device rbtree. The I/O page fault is initiated by the device, which does not have any synchronization mechanism with the software to ensure that the device stays in the probed device tree. Theoretically, a device could be released by the IOMMU subsystem after device_rbtree_find() and before iopf_get_dev_fault_param(), which would cause a use-after-free problem. Add a mutex to synchronize the I/O page fault reporting path and the IOMMU release device path. This lock doesn't introduce any performance overhead, as the conflict between I/O page fault reporting and device releasing is very rare.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <6.8.2 | 6.8.2 |
| redhat/kernel | <6.9 | 6.9 |
| debian/linux | <=5.10.223-1<=5.10.226-1<=6.1.115-1<=6.1.119-1 | 6.12.5-1 |
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Reference Links
- https://git.kernel.org/stable/c/3d39238991e745c5df85785604f037f35d9d1b15
- https://git.kernel.org/stable/c/def054b01a867822254e1dda13d587f5c7a99e2a
- https://launchpad.net/bugs/cve/CVE-2024-35843
- https://access.redhat.com/security/cve/CVE-2024-35843
- https://lore.kernel.org/linux-cve-announce/2024051717-CVE-2024-35843-516e@gregkh/T
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2281277
- https://access.redhat.com/errata/RHSA-2024:9315
- https://bugzilla.redhat.com/show_bug.cgi?id=2281276
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-35843
- https://nvd.nist.gov/vuln/detail/CVE-2024-35843
- https://security-tracker.debian.org/tracker/CVE-2024-35843
- https://ubuntu.com/security/CVE-2024-35843
- https://git.kernel.org/linus/def054b01a867822254e1dda13d587f5c7a99e2a
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