Description
In the Linux kernel, the following vulnerability has been resolved: x86/i8259: Mark legacy PIC interrupts with IRQ_LEVEL Baoquan reported that after triggering a crash the subsequent crash-kernel fails to boot about half of the time. It triggers a NULL pointer dereference in the periodic tick code. This happens because the legacy timer interrupt (IRQ0) is resent in software which happens in soft interrupt (tasklet) context. In this context get_irq_regs() returns NULL which leads to the NULL pointer dereference. The reason for the resend is a spurious APIC interrupt on the IRQ0 vector which is captured and leads to a resend when the legacy timer interrupt is enabled. This is wrong because the legacy PIC interrupts are level triggered and therefore should never be resent in software, but nothing ever sets the IRQ_LEVEL flag on those interrupts, so the core code does not know about their trigger type. Ensure that IRQ_LEVEL is set when the legacy PCI interrupts are set up.
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
a4633adcdbc15ac51afcd0e1395de58cee27cf92 to < 744fe9be9665227335539b7a77ece8d9ff62b6c0affecteda4633adcdbc15ac51afcd0e1395de58cee27cf92 to < 496975d1a2937f4baadf3d985991b13fc4fc4f27affecteda4633adcdbc15ac51afcd0e1395de58cee27cf92 to < 8770cd9d7c14aa99c255a0d08186f0be953e1638affecteda4633adcdbc15ac51afcd0e1395de58cee27cf92 to < e284c273dbb4c1ed68d4204bff94d0b10e4a90f5affecteda4633adcdbc15ac51afcd0e1395de58cee27cf92 to < 0b08201158f177aab469e356b4d6af24fdd118dfaffecteda4633adcdbc15ac51afcd0e1395de58cee27cf92 to < 137f1b47da5f58805da42c1b7811e28c1e353f39affecteda4633adcdbc15ac51afcd0e1395de58cee27cf92 to < 5fa55950729d0762a787451dc52862c3f850f859affected
Linux Linux
Default version status: affected
2.6.18affected0 to < 2.6.18unaffected4.14.305 to ≤ 4.14.*unaffected4.19.272 to ≤ 4.19.*unaffected5.4.231 to ≤ 5.4.*unaffected5.10.166 to ≤ 5.10.*unaffected5.15.91 to ≤ 5.15.*unaffected6.1.9 to ≤ 6.1.*unaffected6.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/744fe9be9665227335539b7a77ece8d9ff62b6c0 ↗
- https://git.kernel.org/stable/c/496975d1a2937f4baadf3d985991b13fc4fc4f27 ↗
- https://git.kernel.org/stable/c/8770cd9d7c14aa99c255a0d08186f0be953e1638 ↗
- https://git.kernel.org/stable/c/e284c273dbb4c1ed68d4204bff94d0b10e4a90f5 ↗
- https://git.kernel.org/stable/c/0b08201158f177aab469e356b4d6af24fdd118df ↗
- https://git.kernel.org/stable/c/137f1b47da5f58805da42c1b7811e28c1e353f39 ↗
- https://git.kernel.org/stable/c/5fa55950729d0762a787451dc52862c3f850f859 ↗