Description
In the Linux kernel, the following vulnerability has been resolved: irqchip/sifive-plic: Fix frozen interrupt due to affinity setting PLIC ignores interrupt completion message for disabled interrupt, explained by the specification: The PLIC signals it has completed executing an interrupt handler by writing the interrupt ID it received from the claim to the claim/complete register. The PLIC does not check whether the completion ID is the same as the last claim ID for that target. If the completion ID does not match an interrupt source that is currently enabled for the target, the completion is silently ignored. This caused problems in the past, because an interrupt can be disabled while still being handled and plic_irq_eoi() had no effect. That was fixed by checking if the interrupt is disabled, and if so enable it, before sending the completion message. That check is done with irqd_irq_disabled(). However, that is not sufficient because the enable bit for the handling hart can be zero despite irqd_irq_disabled(d) being false. This can happen when affinity setting is changed while a hart is still handling the interrupt. This problem is easily reproducible by dumping a large file to uart (which generates lots of interrupts) and at the same time keep changing the uart interrupt's affinity setting. The uart port becomes frozen almost instantaneously. Fix this by checking PLIC's enable bit instead of irqd_irq_disabled().
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
cc9f04f9a84f745949e325661550ed14bd0ff322 to < 8942fb1a5bc2dcbd88f7e656d109d42f778f298faffectedcc9f04f9a84f745949e325661550ed14bd0ff322 to < 2edbd173309165d103be6c73bd83e459dc45ae7baffectedcc9f04f9a84f745949e325661550ed14bd0ff322 to < 686eb378a4a51aa967e08337dd59daade16aec0faffectedcc9f04f9a84f745949e325661550ed14bd0ff322 to < 1883332bf21feb8871af09daf604fc4836a76925affectedcc9f04f9a84f745949e325661550ed14bd0ff322 to < f611791a927141d05d7030607dea6372311c1413affectedcc9f04f9a84f745949e325661550ed14bd0ff322 to < 1072020685f4b81f6efad3b412cdae0bd62bb043affected
Linux Linux
Default version status: affected
5.1affected0 to < 5.1unaffected6.1.167 to ≤ 6.1.*unaffected6.6.130 to ≤ 6.6.*unaffected6.12.77 to ≤ 6.12.*unaffected6.18.17 to ≤ 6.18.*unaffected6.19.7 to ≤ 6.19.*unaffected7.0 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/8942fb1a5bc2dcbd88f7e656d109d42f778f298f ↗
- https://git.kernel.org/stable/c/2edbd173309165d103be6c73bd83e459dc45ae7b ↗
- https://git.kernel.org/stable/c/686eb378a4a51aa967e08337dd59daade16aec0f ↗
- https://git.kernel.org/stable/c/1883332bf21feb8871af09daf604fc4836a76925 ↗
- https://git.kernel.org/stable/c/f611791a927141d05d7030607dea6372311c1413 ↗
- https://git.kernel.org/stable/c/1072020685f4b81f6efad3b412cdae0bd62bb043 ↗
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html ↗