fkie_cve-2024-40970
Vulnerability from fkie_nvd
Published
2024-07-12 13:15
Modified
2024-11-21 09:31
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: Avoid hw_desc array overrun in dw-axi-dmac I have a use case where nr_buffers = 3 and in which each descriptor is composed by 3 segments, resulting in the DMA channel descs_allocated to be 9. Since axi_desc_put() handles the hw_desc considering the descs_allocated, this scenario would result in a kernel panic (hw_desc array will be overrun). To fix this, the proposal is to add a new member to the axi_dma_desc structure, where we keep the number of allocated hw_descs (axi_desc_alloc()) and use it in axi_desc_put() to handle the hw_desc array correctly. Additionally I propose to remove the axi_chan_start_first_queued() call after completing the transfer, since it was identified that unbalance can occur (started descriptors can be interrupted and transfer ignored due to DMA channel not being enabled).
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/333e11bf47fa8d477db90e2900b1ed3c9ae9b697Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7c3bb96a20cd8db3b8824b2ff08b6cde4505c7e5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9004784e8d68bcd1ac1376407ba296fa28f04dbePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dd42570018f5962c10f215ad9c21274ed5d3541ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e151ae1ee065cf4b8ce4394ddb9d9c8df6370c66Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/333e11bf47fa8d477db90e2900b1ed3c9ae9b697Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7c3bb96a20cd8db3b8824b2ff08b6cde4505c7e5Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/9004784e8d68bcd1ac1376407ba296fa28f04dbePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/dd42570018f5962c10f215ad9c21274ed5d3541ePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e151ae1ee065cf4b8ce4394ddb9d9c8df6370c66Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *


To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nAvoid hw_desc array overrun in dw-axi-dmac\n\nI have a use case where nr_buffers = 3 and in which each descriptor is composed by 3\nsegments, resulting in the DMA channel descs_allocated to be 9. Since axi_desc_put()\nhandles the hw_desc considering the descs_allocated, this scenario would result in a\nkernel panic (hw_desc array will be overrun).\n\nTo fix this, the proposal is to add a new member to the axi_dma_desc structure,\nwhere we keep the number of allocated hw_descs (axi_desc_alloc()) and use it in\naxi_desc_put() to handle the hw_desc array correctly.\n\nAdditionally I propose to remove the axi_chan_start_first_queued() call after completing\nthe transfer, since it was identified that unbalance can occur (started descriptors can\nbe interrupted and transfer ignored due to DMA channel not being enabled)."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: Evitar la saturaci\u00f3n de la matriz hw_desc en dw-axi-dmac. Tengo un caso de uso donde nr_buffers = 3 y en el que cada descriptor est\u00e1 compuesto por 3 segmentos, lo que da como resultado que el canal DMA descs_allocated sea 9. Dado que axi_desc_put() maneja hw_desc considerando descs_allocated, este escenario provocar\u00eda un p\u00e1nico en el kernel (la matriz hw_desc se desbordar\u00e1). Para solucionar este problema, la propuesta es agregar un nuevo miembro a la estructura axi_dma_desc, donde mantenemos el n\u00famero de hw_descs asignados (axi_desc_alloc()) y lo usamos en axi_desc_put() para manejar la matriz hw_desc correctamente. Adem\u00e1s, propongo eliminar la llamada axi_chan_start_first_queued() despu\u00e9s de completar la transferencia, ya que se identific\u00f3 que puede ocurrir un desequilibrio (los descriptores iniciados pueden interrumpirse y la transferencia se ignora debido a que el canal DMA no est\u00e1 habilitado)."
    }
  ],
  "id": "CVE-2024-40970",
  "lastModified": "2024-11-21T09:31:58.550",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
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        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2024-07-12T13:15:18.687",
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  "vulnStatus": "Modified",
  "weaknesses": [
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          "value": "NVD-CWE-noinfo"
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      "source": "nvd@nist.gov",
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}


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