ghsa-cqg5-mcpx-q78p
Vulnerability from github
Published
2024-06-24 15:31
Modified
2024-06-26 15:31
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Details

In the Linux kernel, the following vulnerability has been resolved:

riscv: prevent pt_regs corruption for secondary idle threads

Top of the kernel thread stack should be reserved for pt_regs. However this is not the case for the idle threads of the secondary boot harts. Their stacks overlap with their pt_regs, so both may get corrupted.

Similar issue has been fixed for the primary hart, see c7cdd96eca28 ("riscv: prevent stack corruption by reserving task_pt_regs(p) early"). However that fix was not propagated to the secondary harts. The problem has been noticed in some CPU hotplug tests with V enabled. The function smp_callin stored several registers on stack, corrupting top of pt_regs structure including status field. As a result, kernel attempted to save or restore inexistent V context.

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{
  "affected": [],
  "aliases": [
    "CVE-2024-38667"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-787"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-06-24T14:15:12Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: prevent pt_regs corruption for secondary idle threads\n\nTop of the kernel thread stack should be reserved for pt_regs. However\nthis is not the case for the idle threads of the secondary boot harts.\nTheir stacks overlap with their pt_regs, so both may get corrupted.\n\nSimilar issue has been fixed for the primary hart, see c7cdd96eca28\n(\"riscv: prevent stack corruption by reserving task_pt_regs(p) early\").\nHowever that fix was not propagated to the secondary harts. The problem\nhas been noticed in some CPU hotplug tests with V enabled. The function\nsmp_callin stored several registers on stack, corrupting top of pt_regs\nstructure including status field. As a result, kernel attempted to save\nor restore inexistent V context.",
  "id": "GHSA-cqg5-mcpx-q78p",
  "modified": "2024-06-26T15:31:01Z",
  "published": "2024-06-24T15:31:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-38667"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0c1f28c32a194303da630fca89481334b9547b80"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3090c06d50eaa91317f84bf3eac4c265e6cb8d44"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a638b0461b58aa3205cd9d5f14d6f703d795b4af"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ea22d4195cca13d5fdbc4d6555a2dfb8a7867a9e"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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