Description
In the Linux kernel, the following vulnerability has been resolved: igc: fix PTM cycle trigger logic Writing to clear the PTM status 'valid' bit while the PTM cycle is triggered results in unreliable PTM operation. To fix this, clear the PTM 'trigger' and status after each PTM transaction. The issue can be reproduced with the following: $ sudo phc2sys -R 1000 -O 0 -i tsn0 -m Note: 1000 Hz (-R 1000) is unrealistically large, but provides a way to quickly reproduce the issue. PHC2SYS exits with: "ioctl PTP_OFFSET_PRECISE: Connection timed out" when the PTM transaction fails This patch also fixes a hang in igc_probe() when loading the igc driver in the kdump kernel on systems supporting PTM. The igc driver running in the base kernel enables PTM trigger in igc_probe(). Therefore the driver is always in PTM trigger mode, except in brief periods when manually triggering a PTM cycle. When a crash occurs, the NIC is reset while PTM trigger is enabled. Due to a hardware problem, the NIC is subsequently in a bad busmaster state and doesn't handle register reads/writes. When running igc_probe() in the kdump kernel, the first register access to a NIC register hangs driver probing and ultimately breaks kdump. With this patch, igc has PTM trigger disabled most of the time, and the trigger is only enabled for very brief (10 - 100 us) periods when manually triggering a PTM cycle. Chances that a crash occurs during a PTM trigger are not 0, but extremely reduced.
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
a90ec84837325df4b9a6798c2cc0df202b5680bd to < c1f174edaccc5a00f8e218c42a0aa9156efd5f76affecteda90ec84837325df4b9a6798c2cc0df202b5680bd to < 0c03e4fbe1321697d9d04587e21e416705e1b19faffecteda90ec84837325df4b9a6798c2cc0df202b5680bd to < 16194ca3f3b4448a062650c869a7b3b206c6f5d3affecteda90ec84837325df4b9a6798c2cc0df202b5680bd to < f3516229cd12dcd45f23ed01adab17e8772b1bd5affecteda90ec84837325df4b9a6798c2cc0df202b5680bd to < 31959e06143692f7e02b8eef7d7d6ac645637906affecteda90ec84837325df4b9a6798c2cc0df202b5680bd to < 8e404ad95d2c10c261e2ef6992c7c12dde03df0eaffected
Linux Linux
Default version status: affected
5.15affected0 to < 5.15unaffected5.15.181 to ≤ 5.15.*unaffected6.1.135 to ≤ 6.1.*unaffected6.6.88 to ≤ 6.6.*unaffected6.12.25 to ≤ 6.12.*unaffected6.14.4 to ≤ 6.14.*unaffected6.15 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/c1f174edaccc5a00f8e218c42a0aa9156efd5f76 ↗
- https://git.kernel.org/stable/c/0c03e4fbe1321697d9d04587e21e416705e1b19f ↗
- https://git.kernel.org/stable/c/16194ca3f3b4448a062650c869a7b3b206c6f5d3 ↗
- https://git.kernel.org/stable/c/f3516229cd12dcd45f23ed01adab17e8772b1bd5 ↗
- https://git.kernel.org/stable/c/31959e06143692f7e02b8eef7d7d6ac645637906 ↗
- https://git.kernel.org/stable/c/8e404ad95d2c10c261e2ef6992c7c12dde03df0e ↗
- https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html ↗