CVE-2024-35895 In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: Prevent lock inversion deadlock in map…
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.
Produits et versions touchés
| Produit | Versions touchées | Corrigé en |
|---|---|---|
| Linux 6.9 | premières → < 6.9 | 6.9 |
| Linux 6.8 | premières → < 6.8.5 | 6.8.5 |
| Linux 6.6 | premières → < 6.6.26 | 6.6.26 |
| Linux 6.1 | premières → < 6.1.85 | 6.1.85 |
| Linux 5.15 | premières → < 5.15.154 | 5.15.154 |
| Linux 5.10 | premières → < 5.10.215 | 5.10.215 |
| Linux 5.4 | premières → < 5.4.274 | 5.4.274 |
| Linux | 4.20 | Pas de correctif indiqué |
| SIMATIC S7-1500 TM MFP - GNU/Linux subsystem 1.1 | premières → < 1.1.1 | 1.1.1 |