CVE-2022-49030: libbpf: Handle size overflow for ringbuf mmap

First published: Mon Oct 21 2024(Updated: )

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.

Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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