Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: Prevent lock inversion deadlock in map delete elem syzkaller started using corpuses where a BPF tracing program deletes elements from a sockmap/sockhash map. Because BPF tracing programs can be invoked from any interrupt context, locks taken during a map_delete_elem operation must be hardirq-safe. Otherwise a deadlock due to lock inversion is possible, as reported by lockdep: CPU0 CPU1 ---- ---- lock(&htab->buckets[i].lock); local_irq_disable(); lock(&host->lock); lock(&htab->buckets[i].lock); <Interrupt> lock(&host->lock); Locks in sockmap are hardirq-unsafe by design. We expects elements to be deleted from sockmap/sockhash only in task (normal) context with interrupts enabled, or in softirq context. Detect when map_delete_elem operation is invoked from a context which is _not_ hardirq-unsafe, that is interrupts are disabled, and bail out with an error. Note that map updates are not affected by this issue. BPF verifier does not allow updating sockmap/sockhash from a BPF tracing program today.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 604326b41a6fb9b4a78b6179335decee0365cd8c before f7990498b05ac41f7d6a190dc0418ef1d21bf058; affected 604326b41a6fb9b4a78b6179335decee0365cd8c before dd54b48db0c822ae7b520bc80751f0a0a173ef75; affected 604326b41a6fb9b4a78b6179335decee0365cd8c before d1e73fb19a4c872d7a399ad3c66e8ca30e0875ec; affected 604326b41a6fb9b4a78b6179335decee0365cd8c before a44770fed86515eedb5a7c00b787f847ebb134a5; affected 604326b41a6fb9b4a78b6179335decee0365cd8c before 668b3074aa14829e2ac2759799537a93b60fef86; affected 604326b41a6fb9b4a78b6179335decee0365cd8c before 6af057ccdd8e7619960aca1f0428339f213b31cd; affected 604326b41a6fb9b4a78b6179335decee0365cd8c before ff91059932401894e6c86341915615c5eb0eca48 |
| Linux / Linux | affected 4.20; unaffected 0 before 4.20; unaffected 5.4.274 through 5.4.*; unaffected 5.10.215 through 5.10.*; unaffected 5.15.154 through 5.15.*; unaffected 6.1.85 through 6.1.*; unaffected 6.6.26 through 6.6.*; unaffected 6.8.5 through 6.8.*; unaffected 6.9 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/f7990498b05ac41f7d6a190dc0418ef1d21bf058
- https://git.kernel.org/stable/c/dd54b48db0c822ae7b520bc80751f0a0a173ef75
- https://git.kernel.org/stable/c/d1e73fb19a4c872d7a399ad3c66e8ca30e0875ec
- https://git.kernel.org/stable/c/a44770fed86515eedb5a7c00b787f847ebb134a5
- https://git.kernel.org/stable/c/668b3074aa14829e2ac2759799537a93b60fef86
- https://git.kernel.org/stable/c/6af057ccdd8e7619960aca1f0428339f213b31cd
- https://git.kernel.org/stable/c/ff91059932401894e6c86341915615c5eb0eca48
ADP enrichment
No English description supplied.
No references supplied.
No English description supplied.
- https://git.kernel.org/stable/c/f7990498b05ac41f7d6a190dc0418ef1d21bf058
- https://git.kernel.org/stable/c/dd54b48db0c822ae7b520bc80751f0a0a173ef75
- https://git.kernel.org/stable/c/d1e73fb19a4c872d7a399ad3c66e8ca30e0875ec
- https://git.kernel.org/stable/c/a44770fed86515eedb5a7c00b787f847ebb134a5
- https://git.kernel.org/stable/c/668b3074aa14829e2ac2759799537a93b60fef86
- https://git.kernel.org/stable/c/6af057ccdd8e7619960aca1f0428339f213b31cd
- https://git.kernel.org/stable/c/ff91059932401894e6c86341915615c5eb0eca48
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
No English description supplied.