Bug 2312080 (CVE-2024-46692)

Summary: CVE-2024-46692 kernel: firmware: qcom: scm: Mark get_wq_ctx() as atomic call
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: low    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Bug Depends On: 2312210    
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Description OSIDB Bzimport 2024-09-13 06:21:22 UTC 
In the Linux kernel, the following vulnerability has been resolved:

firmware: qcom: scm: Mark get_wq_ctx() as atomic call

Currently get_wq_ctx() is wrongly configured as a standard call. When two
SMC calls are in sleep and one SMC wakes up, it calls get_wq_ctx() to
resume the corresponding sleeping thread. But if get_wq_ctx() is
interrupted, goes to sleep and another SMC call is waiting to be allocated
a waitq context, it leads to a deadlock.

To avoid this get_wq_ctx() must be an atomic call and can't be a standard
SMC call. Hence mark get_wq_ctx() as a fast call.
Comment 1 Michal Findra 2024-09-13 14:45:49 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024091339-CVE-2024-46692-f287@gregkh/T