cve-2024-35895
Vulnerability from cvelistv5
Published
2024-05-19 08:34
Modified
2024-12-19 08:57
Severity ?
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/668b3074aa14829e2ac2759799537a93b60fef86
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6af057ccdd8e7619960aca1f0428339f213b31cd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/913c30f827e17d8cda1da6eeb990f350d36cb69b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a44770fed86515eedb5a7c00b787f847ebb134a5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d1e73fb19a4c872d7a399ad3c66e8ca30e0875ec
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dd54b48db0c822ae7b520bc80751f0a0a173ef75
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f7990498b05ac41f7d6a190dc0418ef1d21bf058
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ff91059932401894e6c86341915615c5eb0eca48
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/668b3074aa14829e2ac2759799537a93b60fef86
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6af057ccdd8e7619960aca1f0428339f213b31cd
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a44770fed86515eedb5a7c00b787f847ebb134a5
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d1e73fb19a4c872d7a399ad3c66e8ca30e0875ec
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/dd54b48db0c822ae7b520bc80751f0a0a173ef75
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f7990498b05ac41f7d6a190dc0418ef1d21bf058
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ff91059932401894e6c86341915615c5eb0eca48
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
Impacted products
Vendor Product Version
Linux Linux Version: 4.20
Show details on NVD website

To clipboard 

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Otherwise a deadlock due to lock inversion\\nis possible, as reported by lockdep:\\n\\n       CPU0                    CPU1\\n       ----                    ----\\n  lock(\u0026htab-\u003ebuckets[i].lock);\\n                               local_irq_disable();\\n                               lock(\u0026host-\u003elock);\\n                               lock(\u0026htab-\u003ebuckets[i].lock);\\n  \u003cInterrupt\u003e\\n    lock(\u0026host-\u003elock);\\n\\nLocks in sockmap are hardirq-unsafe by design. We expects elements to be\\ndeleted from sockmap/sockhash only in task (normal) context with interrupts\\nenabled, or in softirq context.\\n\\nDetect when map_delete_elem operation is invoked from a context which is\\n_not_ hardirq-unsafe, that is interrupts are disabled, and bail out with an\\nerror.\\n\\nNote that map updates are not affected by this issue. BPF verifier does not\\nallow updating sockmap/sockhash from a BPF tracing program today.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf, sockmap: Evitar el punto muerto de inversi\u00f3n de bloqueo en la eliminaci\u00f3n del mapa elem syzkaller comenz\u00f3 a usar corpus donde un programa de seguimiento BPF elimina elementos de un mapa sockmap/sockhash. Debido a que los programas de seguimiento BPF se pueden invocar desde cualquier contexto de interrupci\u00f3n, los bloqueos realizados durante una operaci\u00f3n map_delete_elem deben ser seguros. De lo contrario, es posible que se produzca un punto muerto debido a la inversi\u00f3n del bloqueo, como lo informa lockdep: CPU0 CPU1 ---- ---- lock(\u0026amp;htab-\u0026gt;buckets[i].lock); local_irq_disable(); bloquear(\u0026amp;host-\u0026gt;bloquear); lock(\u0026amp;htab-\u0026gt;cubos[i].lock);  bloqueo(\u0026amp;host-\u0026gt;bloqueo); Los bloqueos en sockmap son dif\u00edciles de inseguro por dise\u00f1o. Esperamos que los elementos se eliminen de sockmap/sockhash solo en el contexto de la tarea (normal) con las interrupciones habilitadas o en el contexto de softirq. Detecta cu\u00e1ndo se invoca la operaci\u00f3n map_delete_elem desde un contexto que _no_ es hardirq-inseguro, es decir, las interrupciones est\u00e1n deshabilitadas y sale con un error. Tenga en cuenta que las actualizaciones de mapas no se ven afectadas por este problema. El verificador de BPF no permite actualizar sockmap/sockhash desde un programa de seguimiento de BPF en la actualidad.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/668b3074aa14829e2ac2759799537a93b60fef86\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6af057ccdd8e7619960aca1f0428339f213b31cd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/913c30f827e17d8cda1da6eeb990f350d36cb69b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a44770fed86515eedb5a7c00b787f847ebb134a5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d1e73fb19a4c872d7a399ad3c66e8ca30e0875ec\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dd54b48db0c822ae7b520bc80751f0a0a173ef75\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f7990498b05ac41f7d6a190dc0418ef1d21bf058\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ff91059932401894e6c86341915615c5eb0eca48\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/668b3074aa14829e2ac2759799537a93b60fef86\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/6af057ccdd8e7619960aca1f0428339f213b31cd\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/a44770fed86515eedb5a7c00b787f847ebb134a5\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/d1e73fb19a4c872d7a399ad3c66e8ca30e0875ec\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/dd54b48db0c822ae7b520bc80751f0a0a173ef75\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/f7990498b05ac41f7d6a190dc0418ef1d21bf058\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/ff91059932401894e6c86341915615c5eb0eca48\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
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}


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