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.

References

• https://nvd.nist.gov/vuln/detail/CVE-2022-49030
• https://git.kernel.org/stable/c/0140e079a42064680394fff1199a7b5483688dec
• https://git.kernel.org/stable/c/535a25ab4f9a45f74ba38ab71de95e97474922ed
• https://git.kernel.org/stable/c/8a549ab6724520aa3c07f47e0eba820293551490
• https://git.kernel.org/stable/c/927cbb478adf917e0a142b94baa37f06279cc466