ghsa-2vp9-gjfg-fmgw
Vulnerability from github
Published
2024-04-03 15:30
Modified
2024-04-04 15:30
Details

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

powerpc/kasan: Limit KASAN thread size increase to 32KB

KASAN is seen to increase stack usage, to the point that it was reported to lead to stack overflow on some 32-bit machines (see link).

To avoid overflows the stack size was doubled for KASAN builds in commit 3e8635fb2e07 ("powerpc/kasan: Force thread size increase with KASAN").

However with a 32KB stack size to begin with, the doubling leads to a 64KB stack, which causes build errors: arch/powerpc/kernel/switch.S:249: Error: operand out of range (0x000000000000fe50 is not between 0xffffffffffff8000 and 0x0000000000007fff)

Although the asm could be reworked, in practice a 32KB stack seems sufficient even for KASAN builds - the additional usage seems to be in the 2-3KB range for a 64-bit KASAN build.

So only increase the stack for KASAN if the stack size is < 32KB.

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{
  "affected": [],
  "aliases": [
    "CVE-2024-26710"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-04-03T15:15:53Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/kasan: Limit KASAN thread size increase to 32KB\n\nKASAN is seen to increase stack usage, to the point that it was reported\nto lead to stack overflow on some 32-bit machines (see link).\n\nTo avoid overflows the stack size was doubled for KASAN builds in\ncommit 3e8635fb2e07 (\"powerpc/kasan: Force thread size increase with\nKASAN\").\n\nHowever with a 32KB stack size to begin with, the doubling leads to a\n64KB stack, which causes build errors:\n  arch/powerpc/kernel/switch.S:249: Error: operand out of range (0x000000000000fe50 is not between 0xffffffffffff8000 and 0x0000000000007fff)\n\nAlthough the asm could be reworked, in practice a 32KB stack seems\nsufficient even for KASAN builds - the additional usage seems to be in\nthe 2-3KB range for a 64-bit KASAN build.\n\nSo only increase the stack for KASAN if the stack size is \u003c 32KB.",
  "id": "GHSA-2vp9-gjfg-fmgw",
  "modified": "2024-04-04T15:30:33Z",
  "published": "2024-04-03T15:30:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-26710"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4297217bcf1f0948a19c2bacc6b68d92e7778ad9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4cc31fa07445879a13750cb061bb8c2654975fcb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b29b16bd836a838b7690f80e37f8376414c74cbe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f1acb109505d983779bbb7e20a1ee6244d2b5736"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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