cve-2021-47615
Vulnerability from cvelistv5
Published
2024-06-19 14:58
Modified
2024-11-04 12:09
Severity ?
Summary
RDMA/mlx5: Fix releasing unallocated memory in dereg MR flow
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c44979ace49b4aede3cc7cb5542316e53a4005c9Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e3bc4d4b50cae7db08e50dbe43f771c906e97701Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f0ae4afe3d35e67db042c58a52909e06262b740fPatch
Impacted products
Vendor Product Version
Linux Linux Version: 5.13
Show details on NVD website

To clipboard 

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                "id": "CVE-2021-47615",
                "options": [
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    "cna": {
      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/hw/mlx5/mlx5_ib.h",
            "drivers/infiniband/hw/mlx5/mr.c"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/mlx5: Fix releasing unallocated memory in dereg MR flow\n\nFor the case of IB_MR_TYPE_DM the mr does doesn\u0027t have a umem, even though\nit is a user MR. This causes function mlx5_free_priv_descs() to think that\nit is a kernel MR, leading to wrongly accessing mr-\u003edescs that will get\nwrong values in the union which leads to attempt to release resources that\nwere not allocated in the first place.\n\nFor example:\n DMA-API: mlx5_core 0000:08:00.1: device driver tries to free DMA memory it has not allocated [device address=0x0000000000000000] [size=0 bytes]\n WARNING: CPU: 8 PID: 1021 at kernel/dma/debug.c:961 check_unmap+0x54f/0x8b0\n RIP: 0010:check_unmap+0x54f/0x8b0\n Call Trace:\n  debug_dma_unmap_page+0x57/0x60\n  mlx5_free_priv_descs+0x57/0x70 [mlx5_ib]\n  mlx5_ib_dereg_mr+0x1fb/0x3d0 [mlx5_ib]\n  ib_dereg_mr_user+0x60/0x140 [ib_core]\n  uverbs_destroy_uobject+0x59/0x210 [ib_uverbs]\n  uobj_destroy+0x3f/0x80 [ib_uverbs]\n  ib_uverbs_cmd_verbs+0x435/0xd10 [ib_uverbs]\n  ? uverbs_finalize_object+0x50/0x50 [ib_uverbs]\n  ? lock_acquire+0xc4/0x2e0\n  ? lock_acquired+0x12/0x380\n  ? lock_acquire+0xc4/0x2e0\n  ? lock_acquire+0xc4/0x2e0\n  ? ib_uverbs_ioctl+0x7c/0x140 [ib_uverbs]\n  ? lock_release+0x28a/0x400\n  ib_uverbs_ioctl+0xc0/0x140 [ib_uverbs]\n  ? ib_uverbs_ioctl+0x7c/0x140 [ib_uverbs]\n  __x64_sys_ioctl+0x7f/0xb0\n  do_syscall_64+0x38/0x90\n\nFix it by reorganizing the dereg flow and mlx5_ib_mr structure:\n - Move the ib_umem field into the user MRs structure in the union as it\u0027s\n   applicable only there.\n - Function mlx5_ib_dereg_mr() will now call mlx5_free_priv_descs() only\n   in case there isn\u0027t udata, which indicates that this isn\u0027t a user MR."
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      "title": "RDMA/mlx5: Fix releasing unallocated memory in dereg MR flow",
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    "dateReserved": "2024-06-19T14:55:32.795Z",
    "dateUpdated": "2024-11-04T12:09:13.450Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47615\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-06-19T15:15:56.030\",\"lastModified\":\"2024-10-30T21:40:52.577\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nRDMA/mlx5: Fix releasing unallocated memory in dereg MR flow\\n\\nFor the case of IB_MR_TYPE_DM the mr does doesn\u0027t have a umem, even though\\nit is a user MR. This causes function mlx5_free_priv_descs() to think that\\nit is a kernel MR, leading to wrongly accessing mr-\u003edescs that will get\\nwrong values in the union which leads to attempt to release resources that\\nwere not allocated in the first place.\\n\\nFor example:\\n DMA-API: mlx5_core 0000:08:00.1: device driver tries to free DMA memory it has not allocated [device address=0x0000000000000000] [size=0 bytes]\\n WARNING: CPU: 8 PID: 1021 at kernel/dma/debug.c:961 check_unmap+0x54f/0x8b0\\n RIP: 0010:check_unmap+0x54f/0x8b0\\n Call Trace:\\n  debug_dma_unmap_page+0x57/0x60\\n  mlx5_free_priv_descs+0x57/0x70 [mlx5_ib]\\n  mlx5_ib_dereg_mr+0x1fb/0x3d0 [mlx5_ib]\\n  ib_dereg_mr_user+0x60/0x140 [ib_core]\\n  uverbs_destroy_uobject+0x59/0x210 [ib_uverbs]\\n  uobj_destroy+0x3f/0x80 [ib_uverbs]\\n  ib_uverbs_cmd_verbs+0x435/0xd10 [ib_uverbs]\\n  ? uverbs_finalize_object+0x50/0x50 [ib_uverbs]\\n  ? lock_acquire+0xc4/0x2e0\\n  ? lock_acquired+0x12/0x380\\n  ? lock_acquire+0xc4/0x2e0\\n  ? lock_acquire+0xc4/0x2e0\\n  ? ib_uverbs_ioctl+0x7c/0x140 [ib_uverbs]\\n  ? lock_release+0x28a/0x400\\n  ib_uverbs_ioctl+0xc0/0x140 [ib_uverbs]\\n  ? ib_uverbs_ioctl+0x7c/0x140 [ib_uverbs]\\n  __x64_sys_ioctl+0x7f/0xb0\\n  do_syscall_64+0x38/0x90\\n\\nFix it by reorganizing the dereg flow and mlx5_ib_mr structure:\\n - Move the ib_umem field into the user MRs structure in the union as it\u0027s\\n   applicable only there.\\n - Function mlx5_ib_dereg_mr() will now call mlx5_free_priv_descs() only\\n   in case there isn\u0027t udata, which indicates that this isn\u0027t a user MR.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: RDMA/mlx5: Se corrigi\u00f3 la liberaci\u00f3n de memoria no asignada en el flujo de MR dereg. Para el caso de IB_MR_TYPE_DM, mr no tiene un umem, aunque sea un usuario MR. Esto hace que la funci\u00f3n mlx5_free_priv_descs() piense que es un MR del kernel, lo que lleva a un acceso incorrecto a mr-\u0026gt;descs que obtendr\u00e1 valores incorrectos en la uni\u00f3n, lo que lleva a intentar liberar recursos que no fueron asignados en primer lugar. Por ejemplo: DMA-API: mlx5_core 0000:08:00.1: el controlador de dispositivo intenta liberar la memoria DMA que no ha asignado [direcci\u00f3n del dispositivo=0x0000000000000000] [tama\u00f1o=0 bytes] ADVERTENCIA: CPU: 8 PID: 1021 en kernel/dma/ debug.c:961 check_unmap+0x54f/0x8b0 RIP: 0010:check_unmap+0x54f/0x8b0 Seguimiento de llamadas: debug_dma_unmap_page+0x57/0x60 mlx5_free_priv_descs+0x57/0x70 [mlx5_ib] [mlx5_ib] ib_dereg_mr_user+0x60/0x140 [ib_core ] uverbs_destroy_uobject+0x59/0x210 [ib_uverbs] uobj_destroy+0x3f/0x80 [ib_uverbs] ib_uverbs_cmd_verbs+0x435/0xd10 [ib_uverbs] ? uverbs_finalize_object+0x50/0x50 [ib_uverbs] ? lock_acquire+0xc4/0x2e0? lock_adquirido+0x12/0x380? lock_acquire+0xc4/0x2e0? lock_acquire+0xc4/0x2e0? ib_uverbs_ioctl+0x7c/0x140 [ib_uverbs] ? lock_release+0x28a/0x400 ib_uverbs_ioctl+0xc0/0x140 [ib_uverbs]? ib_uverbs_ioctl+0x7c/0x140 [ib_uverbs] __x64_sys_ioctl+0x7f/0xb0 do_syscall_64+0x38/0x90 Soluci\u00f3nelo reorganizando el flujo de dereg y la estructura mlx5_ib_mr: - Mueva el campo ib_umem a la estructura MRs del usuario en la uni\u00f3n, ya que solo se aplica all\u00ed. - La funci\u00f3n mlx5_ib_dereg_mr() ahora llamar\u00e1 a mlx5_free_priv_descs() solo en caso de que no haya udata, lo que indica que no se trata de un usuario MR.\"}],\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-763\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.13\",\"versionEndExcluding\":\"5.15.10\",\"matchCriteriaId\":\"E9D0476A-0FB0-45DA-9F86-8BFA33F2D3DE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.15.11\",\"versionEndExcluding\":\"5.15.14\",\"matchCriteriaId\":\"8AEABDBA-0C00-4B1F-AC88-A88D15AD1360\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"357AA433-37E8-4323-BFB2-3038D6E4B414\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.16:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"A73429BA-C2D9-4D0C-A75F-06A1CA8B3983\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.16:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"F621B5E3-E99D-49E7-90B9-EC3B77C95383\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.16:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"F7BFDCAA-1650-49AA-8462-407DD593F94F\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/c44979ace49b4aede3cc7cb5542316e53a4005c9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e3bc4d4b50cae7db08e50dbe43f771c906e97701\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f0ae4afe3d35e67db042c58a52909e06262b740f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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