Bug 2301505 (CVE-2024-42140)

Summary: CVE-2024-42140 kernel: riscv: kexec: Avoid deadlock in kexec crash path
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: kernel 5.15.163, kernel 6.1.98, kernel 6.6.39, kernel 6.9.9, kernel 6.10 Doc Type: If docs needed, set a value
Doc Text:
A potential for deadlock was observed in the Linux kernel in kexec crash path. This may lead to compromised Availability.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 2302000    
Bug Blocks:    

Description OSIDB Bzimport 2024-07-30 08:37:33 UTC 
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.
Comment 1 Mauro Matteo Cascella 2024-07-31 10:27:43 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024073030-CVE-2024-42140-65eb@gregkh/T
Comment 2 Mauro Matteo Cascella 2024-07-31 10:28:05 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2302000]