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CVE PROGRAM SOURCE RECORDUnscored

CVE-2024-35895

bpf, sockmap: Prevent lock inversion deadlock in map delete elem

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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 products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 604326b41a6fb9b4a78b6179335decee0365cd8c to < f7990498b05ac41f7d6a190dc0418ef1d21bf058affected
  • 604326b41a6fb9b4a78b6179335decee0365cd8c to < dd54b48db0c822ae7b520bc80751f0a0a173ef75affected
  • 604326b41a6fb9b4a78b6179335decee0365cd8c to < d1e73fb19a4c872d7a399ad3c66e8ca30e0875ecaffected
  • 604326b41a6fb9b4a78b6179335decee0365cd8c to < a44770fed86515eedb5a7c00b787f847ebb134a5affected
  • 604326b41a6fb9b4a78b6179335decee0365cd8c to < 668b3074aa14829e2ac2759799537a93b60fef86affected
  • 604326b41a6fb9b4a78b6179335decee0365cd8c to < 6af057ccdd8e7619960aca1f0428339f213b31cdaffected
  • 604326b41a6fb9b4a78b6179335decee0365cd8c to < ff91059932401894e6c86341915615c5eb0eca48affected

Linux Linux

Default version status: affected

  • 4.20affected
  • 0 to < 4.20unaffected
  • 5.4.274 to ≤ 5.4.*unaffected
  • 5.10.215 to ≤ 5.10.*unaffected
  • 5.15.154 to ≤ 5.15.*unaffected
  • 6.1.85 to ≤ 6.1.*unaffected
  • 6.6.26 to ≤ 6.6.*unaffected
  • 6.8.5 to ≤ 6.8.*unaffected
  • 6.9 to ≤ *unaffected

References