Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: bpf: Make sure internal and UAPI bpf_redirect flags don't overlap The bpf_redirect_info is shared between the SKB and XDP redirect paths, and the two paths use the same numeric flag values in the ri->flags field (specifically, BPF_F_BROADCAST == BPF_F_NEXTHOP). This means that if skb bpf_redirect_neigh() is used with a non-NULL params argument and, subsequently, an XDP redirect is performed using the same bpf_redirect_info struct, the XDP path will get confused and end up crashing, which syzbot managed to trigger. With the stack-allocated bpf_redirect_info, the structure is no longer shared between the SKB and XDP paths, so the crash doesn't happen anymore. However, different code paths using identically-numbered flag values in the same struct field still seems like a bit of a mess, so this patch cleans that up by moving the flag definitions together and redefining the three flags in BPF_F_REDIRECT_INTERNAL to not overlap with the flags used for XDP. It also adds a BUILD_BUG_ON() check to make sure the overlap is not re-introduced by mistake.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected e624d4ed4aa8cc3c69d1359b0aaea539203ed266 before 4e1e428533845d48828bd3875c0e92e8565b9962; affected e624d4ed4aa8cc3c69d1359b0aaea539203ed266 before 314dbee9fe4f5cee36435465de52c988d7caa466; affected e624d4ed4aa8cc3c69d1359b0aaea539203ed266 before 0fca5ed4be8e8bfbfb9bd97845af596bab7192d3; affected e624d4ed4aa8cc3c69d1359b0aaea539203ed266 before cec288e05ceac9a0d3a3a1fd279534b11844c826; affected e624d4ed4aa8cc3c69d1359b0aaea539203ed266 before 09d88791c7cd888d5195c84733caf9183dcfbd16 |
| Linux / Linux | affected 5.14; unaffected 0 before 5.14; unaffected 5.15.170 through 5.15.*; unaffected 6.1.115 through 6.1.*; unaffected 6.6.59 through 6.6.*; unaffected 6.11.6 through 6.11.*; unaffected 6.12 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/4e1e428533845d48828bd3875c0e92e8565b9962
- https://git.kernel.org/stable/c/314dbee9fe4f5cee36435465de52c988d7caa466
- https://git.kernel.org/stable/c/0fca5ed4be8e8bfbfb9bd97845af596bab7192d3
- https://git.kernel.org/stable/c/cec288e05ceac9a0d3a3a1fd279534b11844c826
- https://git.kernel.org/stable/c/09d88791c7cd888d5195c84733caf9183dcfbd16
ADP enrichment
No English description supplied.
No references supplied.
No English description supplied.