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Message-ID: <2024102155-CVE-2022-49030-cee8@gregkh> Date: Mon, 21 Oct 2024 22:07:02 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2022-49030: libbpf: Handle size overflow for ringbuf mmap Description =========== 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. The Linux kernel CVE team has assigned CVE-2022-49030 to this issue. Affected and fixed versions =========================== Issue introduced in 5.8 with commit bf99c936f947 and fixed in 5.10.158 with commit 8a549ab67245 Issue introduced in 5.8 with commit bf99c936f947 and fixed in 5.15.82 with commit 0140e079a420 Issue introduced in 5.8 with commit bf99c936f947 and fixed in 6.0.12 with commit 535a25ab4f9a Issue introduced in 5.8 with commit bf99c936f947 and fixed in 6.1 with commit 927cbb478adf Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2022-49030 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: tools/lib/bpf/ringbuf.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/8a549ab6724520aa3c07f47e0eba820293551490 https://git.kernel.org/stable/c/0140e079a42064680394fff1199a7b5483688dec https://git.kernel.org/stable/c/535a25ab4f9a45f74ba38ab71de95e97474922ed https://git.kernel.org/stable/c/927cbb478adf917e0a142b94baa37f06279cc466
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