Bug 2320776 (CVE-2022-49030)

Summary: CVE-2022-49030 kernel: libbpf: Handle size overflow for ringbuf mmap
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2024-10-21 22:03:32 UTC 
In the Linux kernel, the following vulnerability has been resolved:

libbpf: Handle size overflow for ringbuf mmap

The maximum size of ringbuf is 2GB on x86-64 host, so 2 * max_entries
will overflow u32 when mapping producer page and data pages. Only
casting max_entries to size_t is not enough, because for 32-bits
application on 64-bits kernel the size of read-only mmap region
also could overflow size_t.

So fixing it by casting the size of read-only mmap region into a __u64
and checking whether or not there will be overflow during mmap.
Comment 1 Avinash Hanwate 2024-10-22 05:43:30 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024102155-CVE-2022-49030-cee8@gregkh/T