cve-2024-42071
Vulnerability from cvelistv5
Published
2024-07-29 15:52
Modified
2024-12-19 09:12
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ionic: use dev_consume_skb_any outside of napi If we're not in a NAPI softirq context, we need to be careful about how we call napi_consume_skb(), specifically we need to call it with budget==0 to signal to it that we're not in a safe context. This was found while running some configuration stress testing of traffic and a change queue config loop running, and this curious note popped out: [ 4371.402645] BUG: using smp_processor_id() in preemptible [00000000] code: ethtool/20545 [ 4371.402897] caller is napi_skb_cache_put+0x16/0x80 [ 4371.403120] CPU: 25 PID: 20545 Comm: ethtool Kdump: loaded Tainted: G OE 6.10.0-rc3-netnext+ #8 [ 4371.403302] Hardware name: HPE ProLiant DL360 Gen10/ProLiant DL360 Gen10, BIOS U32 01/23/2021 [ 4371.403460] Call Trace: [ 4371.403613] <TASK> [ 4371.403758] dump_stack_lvl+0x4f/0x70 [ 4371.403904] check_preemption_disabled+0xc1/0xe0 [ 4371.404051] napi_skb_cache_put+0x16/0x80 [ 4371.404199] ionic_tx_clean+0x18a/0x240 [ionic] [ 4371.404354] ionic_tx_cq_service+0xc4/0x200 [ionic] [ 4371.404505] ionic_tx_flush+0x15/0x70 [ionic] [ 4371.404653] ? ionic_lif_qcq_deinit.isra.23+0x5b/0x70 [ionic] [ 4371.404805] ionic_txrx_deinit+0x71/0x190 [ionic] [ 4371.404956] ionic_reconfigure_queues+0x5f5/0xff0 [ionic] [ 4371.405111] ionic_set_ringparam+0x2e8/0x3e0 [ionic] [ 4371.405265] ethnl_set_rings+0x1f1/0x300 [ 4371.405418] ethnl_default_set_doit+0xbb/0x160 [ 4371.405571] genl_family_rcv_msg_doit+0xff/0x130 [...] I found that ionic_tx_clean() calls napi_consume_skb() which calls napi_skb_cache_put(), but before that last call is the note /* Zero budget indicate non-NAPI context called us, like netpoll */ and DEBUG_NET_WARN_ON_ONCE(!in_softirq()); Those are pretty big hints that we're doing it wrong. We can pass a context hint down through the calls to let ionic_tx_clean() know what we're doing so it can call napi_consume_skb() correctly.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/84b767f9e34fdb143c09e66a2a20722fc2921821Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ef7646ed49fff962e97b276f4ab91327a67eeb5aPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/84b767f9e34fdb143c09e66a2a20722fc2921821Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ef7646ed49fff962e97b276f4ab91327a67eeb5aPatch
Impacted products
Vendor Product Version
Linux Linux Version: 386e69865311044b576ff536c99c6ee9cc98a228
Version: 386e69865311044b576ff536c99c6ee9cc98a228
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   Linux Linux Version: 6.9
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We can pass a\\ncontext hint down through the calls to let ionic_tx_clean() know what\\nwe're doing so it can call napi_consume_skb() correctly.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ionic: usa dev_consume_skb_any fuera de napi. Si no estamos en un contexto de softirq de NAPI, debemos tener cuidado con cómo llamamos a napi_consume_skb(), específicamente debemos llamarlo con Budget==0 para indicarle que no estamos en un contexto seguro. Esto se encontró mientras se ejecutaban algunas pruebas de estrés de configuración del tráfico y se ejecutaba un bucle de configuración de cola de cambios, y apareció esta nota curiosa: [4371.402645] ERROR: usar smp_processor_id() en código interrumpible [00000000]: ethtool/20545 [4371.402897] la persona que llama es napi_skb_cache_put+0x16/0x80 [ 4371.403120] CPU: 25 PID: 20545 Comm: ethtool Kdump: loaded Tainted: G OE 6.10.0-rc3-netnext+ #8 [ 4371.403302] Nombre de hardware: HPE ProLiant DL360 Gen10/ProLiant DL360 Gen 10, BIOSU32 23/01/2021 [ 4371.403460] Seguimiento de llamadas: [ 4371.403613]  [ 4371.403758] dump_stack_lvl+0x4f/0x70 [ 4371.403904] check_preemption_disabled+0xc1/0xe0 [ 4371.40405 1] napi_skb_cache_put+0x16/0x80 [ 4371.404199] ionic_tx_clean+0x18a/0x240 [ iónico] [4371.404354] ionic_tx_cq_service+0xc4/0x200 [iónico] [4371.404505] ionic_tx_flush+0x15/0x70 [iónico] [4371.404653]? ionic_lif_qcq_deinit.isra.23+0x5b/0x70 [ionic] [ 4371.404805] ionic_txrx_deinit+0x71/0x190 [ionic] [ 4371.404956] ionic_reconfigure_queues+0x5f5/0xff0 [ionic] [ 4371.4051 11] ionic_set_ringparam+0x2e8/0x3e0 [ionic] [4371.405265] ethnl_set_rings+ 0x1f1/0x300 [ 4371.405418] ethnl_default_set_doit+0xbb/0x160 [ 4371.405571] genl_family_rcv_msg_doit+0xff/0x130 [...] encontré que ionic_tx_clean() llama a napi_consume_skb() que llama a napi_skb_cache_put() , pero antes de esa última llamada está la nota /* El presupuesto cero indica que nos llamó un contexto que no es NAPI, como netpoll */ y DEBUG_NET_WARN_ON_ONCE(!in_softirq()); Esos son indicios bastante importantes de que lo estamos haciendo mal. Podemos pasar una sugerencia de contexto a través de las llamadas para que ionic_tx_clean() sepa lo que estamos haciendo para que pueda llamar a napi_consume_skb() correctamente.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-834\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"6.9\",\"matchCriteriaId\":\"18FE1EAE-C36C-49FC-A5E0-0A661CDC561E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.9.1\",\"versionEndExcluding\":\"6.9.8\",\"matchCriteriaId\":\"1557DCF8-46D3-4910-8B19-5C77412AB681\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/84b767f9e34fdb143c09e66a2a20722fc2921821\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ef7646ed49fff962e97b276f4ab91327a67eeb5a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/84b767f9e34fdb143c09e66a2a20722fc2921821\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ef7646ed49fff962e97b276f4ab91327a67eeb5a\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
      vulnrichment: {
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}


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Title of the comment
Description of the comment
The identifier of the vulnerability (CVE ID, GHSA-ID, PYSEC ID, etc.).



Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.