Description
In the Linux kernel, the following vulnerability has been resolved: PCI: Fix pci_device_is_present() for VFs by checking PF pci_device_is_present() previously didn't work for VFs because it reads the Vendor and Device ID, which are 0xffff for VFs, which looks like they aren't present. Check the PF instead. Wei Gong reported that if virtio I/O is in progress when the driver is unbound or "0" is written to /sys/.../sriov_numvfs, the virtio I/O operation hangs, which may result in output like this: task:bash state:D stack: 0 pid: 1773 ppid: 1241 flags:0x00004002 Call Trace: schedule+0x4f/0xc0 blk_mq_freeze_queue_wait+0x69/0xa0 blk_mq_freeze_queue+0x1b/0x20 blk_cleanup_queue+0x3d/0xd0 virtblk_remove+0x3c/0xb0 [virtio_blk] virtio_dev_remove+0x4b/0x80 ... device_unregister+0x1b/0x60 unregister_virtio_device+0x18/0x30 virtio_pci_remove+0x41/0x80 pci_device_remove+0x3e/0xb0 This happened because pci_device_is_present(VF) returned "false" in virtio_pci_remove(), so it called virtio_break_device(). The broken vq meant that vring_interrupt() skipped the vq.callback() that would have completed the virtio I/O operation via virtblk_done(). [bhelgaas: commit log, simplify to always use pci_physfn(), add stable tag]
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
8496e85c20e7836b3dec97780e40f420a3ae2801 to < f4b44c7766dae2b8681f621941cabe9f14066d59affected8496e85c20e7836b3dec97780e40f420a3ae2801 to < 643d77fda08d06f863af35e80a7e517ea61d9629affected8496e85c20e7836b3dec97780e40f420a3ae2801 to < 65bd0962992abd42e77a05e68c7b40e7c73726d1affected8496e85c20e7836b3dec97780e40f420a3ae2801 to < 99ef6cc791584495987dd11b14769b450dfa5820affected8496e85c20e7836b3dec97780e40f420a3ae2801 to < 67fd41bbb0f51aa648a47f728b99e6f1fa2ccc34affected8496e85c20e7836b3dec97780e40f420a3ae2801 to < 81565e51ccaf6fff8910e997ee22e16b5e1dabc3affected8496e85c20e7836b3dec97780e40f420a3ae2801 to < 518573988a2f14f517403db2ece5ddaefba21e94affected8496e85c20e7836b3dec97780e40f420a3ae2801 to < 98b04dd0b4577894520493d96bc4623387767445affected
Linux Linux
Default version status: affected
3.13affected0 to < 3.13unaffected4.14.303 to ≤ 4.14.*unaffected4.19.270 to ≤ 4.19.*unaffected5.4.229 to ≤ 5.4.*unaffected5.10.163 to ≤ 5.10.*unaffected5.15.87 to ≤ 5.15.*unaffected6.0.18 to ≤ 6.0.*unaffected6.1.4 to ≤ 6.1.*unaffected6.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/f4b44c7766dae2b8681f621941cabe9f14066d59 ↗
- https://git.kernel.org/stable/c/643d77fda08d06f863af35e80a7e517ea61d9629 ↗
- https://git.kernel.org/stable/c/65bd0962992abd42e77a05e68c7b40e7c73726d1 ↗
- https://git.kernel.org/stable/c/99ef6cc791584495987dd11b14769b450dfa5820 ↗
- https://git.kernel.org/stable/c/67fd41bbb0f51aa648a47f728b99e6f1fa2ccc34 ↗
- https://git.kernel.org/stable/c/81565e51ccaf6fff8910e997ee22e16b5e1dabc3 ↗
- https://git.kernel.org/stable/c/518573988a2f14f517403db2ece5ddaefba21e94 ↗
- https://git.kernel.org/stable/c/98b04dd0b4577894520493d96bc4623387767445 ↗