Vulnerability CVE-2024-42140
Published: 2024-07-30

Description:
In the Linux kernel, the following vulnerability has been resolved:

riscv: kexec: Avoid deadlock in kexec crash path

If the kexec crash code is called in the interrupt context, the
machine_kexec_mask_interrupts() function will trigger a deadlock while
trying to acquire the irqdesc spinlock and then deactivate irqchip in
irq_set_irqchip_state() function.

Unlike arm64, riscv only requires irq_eoi handler to complete EOI and
keeping irq_set_irqchip_state() will only leave this possible deadlock
without any use. So we simply remove it.

 References:
https://git.kernel.org/stable/c/bb80a7911218bbab2a69b5db7d2545643ab0073d
https://git.kernel.org/stable/c/653deee48a4682ea17a05b96fb6842795ab5943c
https://git.kernel.org/stable/c/7692c9b6baacdee378435f58f19baf0eb69e4155
https://git.kernel.org/stable/c/484dd545271d02d1571e1c6b62ea7df9dbe5e692
https://git.kernel.org/stable/c/c562ba719df570c986caf0941fea2449150bcbc4
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