Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: PCI: pciehp: Fix infinite loop in IRQ handler upon power fault The Power Fault Detected bit in the Slot Status register differs from all other hotplug events in that it is sticky: It can only be cleared after turning off slot power. Per PCIe r5.0, sec. 6.7.1.8: If a power controller detects a main power fault on the hot-plug slot, it must automatically set its internal main power fault latch [...]. The main power fault latch is cleared when software turns off power to the hot-plug slot. The stickiness used to cause interrupt storms and infinite loops which were fixed in 2009 by commits 5651c48cfafe ("PCI pciehp: fix power fault interrupt storm problem") and 99f0169c17f3 ("PCI: pciehp: enable software notification on empty slots"). Unfortunately in 2020 the infinite loop issue was inadvertently reintroduced by commit 8edf5332c393 ("PCI: pciehp: Fix MSI interrupt race"): The hardirq handler pciehp_isr() clears the PFD bit until pciehp's power_fault_detected flag is set. That happens in the IRQ thread pciehp_ist(), which never learns of the event because the hardirq handler is stuck in an infinite loop. Fix by setting the power_fault_detected flag already in the hardirq handler.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected a8cc52270f3d8e8f4faf01ffd6c4a95bbfb55ba4 before ff27f7d0333cff89ec85c419f431aca1b38fb16a; affected 4667358dab9cc07da044d5bc087065545b1000df before 464da38ba827f670deac6500a1de9a4f0f44c41d; affected 8edf5332c39340b9583cf9cba659eb7ec71f75b5 before 3b4c966fb156ff3e70b2526d964952ff7c1574d9; affected 8edf5332c39340b9583cf9cba659eb7ec71f75b5 before 1db58c6584a72102e98af2e600ea184ddaf2b8af; affected 8edf5332c39340b9583cf9cba659eb7ec71f75b5 before 6d6f1f0dac3e3441ecdb1103d4efb11b9ed24dd5; affected 8edf5332c39340b9583cf9cba659eb7ec71f75b5 before 23584c1ed3e15a6f4bfab8dc5a88d94ab929ee12; affected 4.19.149 before 4.19.233; affected 5.4.69 before 5.4.177 |
| Linux / Linux | affected 5.7; unaffected 0 before 5.7; unaffected 4.19.233 through 4.19.*; unaffected 5.4.177 through 5.4.*; unaffected 5.10.97 through 5.10.*; unaffected 5.15.20 through 5.15.*; unaffected 5.16.6 through 5.16.*; unaffected 5.17 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/ff27f7d0333cff89ec85c419f431aca1b38fb16a
- https://git.kernel.org/stable/c/464da38ba827f670deac6500a1de9a4f0f44c41d
- https://git.kernel.org/stable/c/3b4c966fb156ff3e70b2526d964952ff7c1574d9
- https://git.kernel.org/stable/c/1db58c6584a72102e98af2e600ea184ddaf2b8af
- https://git.kernel.org/stable/c/6d6f1f0dac3e3441ecdb1103d4efb11b9ed24dd5
- https://git.kernel.org/stable/c/23584c1ed3e15a6f4bfab8dc5a88d94ab929ee12
ADP enrichment
No English description supplied.
- https://git.kernel.org/stable/c/ff27f7d0333cff89ec85c419f431aca1b38fb16a
- https://git.kernel.org/stable/c/464da38ba827f670deac6500a1de9a4f0f44c41d
- https://git.kernel.org/stable/c/3b4c966fb156ff3e70b2526d964952ff7c1574d9
- https://git.kernel.org/stable/c/1db58c6584a72102e98af2e600ea184ddaf2b8af
- https://git.kernel.org/stable/c/6d6f1f0dac3e3441ecdb1103d4efb11b9ed24dd5
- https://git.kernel.org/stable/c/23584c1ed3e15a6f4bfab8dc5a88d94ab929ee12
No English description supplied.
No references supplied.