CVE-2024-46750

Description

In the Linux kernel, the following vulnerability has been resolved: PCI: Add missing bridge lock to pci_bus_lock() One of the true positives that the cfg_access_lock lockdep effort identified is this sequence: WARNING: CPU: 14 PID: 1 at drivers/pci/pci.c:4886 pci_bridge_secondary_bus_reset+0x5d/0x70 RIP: 0010:pci_bridge_secondary_bus_reset+0x5d/0x70 Call Trace: <TASK> ? __warn+0x8c/0x190 ? pci_bridge_secondary_bus_reset+0x5d/0x70 ? report_bug+0x1f8/0x200 ? handle_bug+0x3c/0x70 ? exc_invalid_op+0x18/0x70 ? asm_exc_invalid_op+0x1a/0x20 ? pci_bridge_secondary_bus_reset+0x5d/0x70 pci_reset_bus+0x1d8/0x270 vmd_probe+0x778/0xa10 pci_device_probe+0x95/0x120 Where pci_reset_bus() users are triggering unlocked secondary bus resets. Ironically pci_bus_reset(), several calls down from pci_reset_bus(), uses pci_bus_lock() before issuing the reset which locks everything *but* the bridge itself. For the same motivation as adding: bridge = pci_upstream_bridge(dev); if (bridge) pci_dev_lock(bridge); to pci_reset_function() for the "bus" and "cxl_bus" reset cases, add pci_dev_lock() for @bus->self to pci_bus_lock(). [bhelgaas: squash in recursive locking deadlock fix from Keith Busch: https://lore.kernel.org/r/20240711193650.701834-1-kbusch@meta.com]

Reserved 2024-09-11 | Published 2024-09-18 | Updated 2024-11-05 | Assigner Linux

Product status

Default status
unaffected

1da177e4c3f4 before 0790b89c7e91
affected

1da177e4c3f4 before df77a678c338
affected

1da177e4c3f4 before e2355d513b89
affected

1da177e4c3f4 before 04e85a3285b0
affected

1da177e4c3f4 before 7253b4fed464
affected

1da177e4c3f4 before 78c6e39fef5c
affected

1da177e4c3f4 before 81c68e218ab8
affected

1da177e4c3f4 before a4e772898f8b
affected

Default status
affected

4.19.322
unaffected

5.4.284
unaffected

5.10.226
unaffected

5.15.167
unaffected

6.1.110
unaffected

6.6.51
unaffected

6.10.10
unaffected

6.11
unaffected

References

git.kernel.org/...c/0790b89c7e911003b8c50ae50e3ac7645de1fae9

git.kernel.org/...c/df77a678c33871a6e4ac5b54a71662f1d702335b

git.kernel.org/...c/e2355d513b89a2cb511b4ded0deb426cdb01acd0

git.kernel.org/...c/04e85a3285b0e5c5af6fd2c0fd6e95ffecc01945

git.kernel.org/...c/7253b4fed46471cc247c6cacefac890a8472c083

git.kernel.org/...c/78c6e39fef5c428960aff742149bba302dd46f5a

git.kernel.org/...c/81c68e218ab883dfa368460a59b674084c0240da

git.kernel.org/...c/a4e772898f8bf2e7e1cf661a12c60a5612c4afab

cve.org (CVE-2024-46750)

nvd.nist.gov (CVE-2024-46750)

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