CVE-2022-49675 (GCVE-0-2022-49675)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:24 – Updated: 2025-05-04 08:43
VLAI?
Title
tick/nohz: unexport __init-annotated tick_nohz_full_setup()
Summary
In the Linux kernel, the following vulnerability has been resolved: tick/nohz: unexport __init-annotated tick_nohz_full_setup() EXPORT_SYMBOL and __init is a bad combination because the .init.text section is freed up after the initialization. Hence, modules cannot use symbols annotated __init. The access to a freed symbol may end up with kernel panic. modpost used to detect it, but it had been broken for a decade. Commit 28438794aba4 ("modpost: fix section mismatch check for exported init/exit sections") fixed it so modpost started to warn it again, then this showed up: MODPOST vmlinux.symvers WARNING: modpost: vmlinux.o(___ksymtab_gpl+tick_nohz_full_setup+0x0): Section mismatch in reference from the variable __ksymtab_tick_nohz_full_setup to the function .init.text:tick_nohz_full_setup() The symbol tick_nohz_full_setup is exported and annotated __init Fix this by removing the __init annotation of tick_nohz_full_setup or drop the export. Drop the export because tick_nohz_full_setup() is only called from the built-in code in kernel/sched/isolation.c.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ae9e557b5be2e285f48ee945d9c8faf75d4f6a66 , < c4ff3ffe0138234774602152fe67e3a898c615c6 (git)
Affected: ae9e557b5be2e285f48ee945d9c8faf75d4f6a66 , < f4a80ec8c51d68be4b7a7830c510f75080c5e417 (git)
Affected: ae9e557b5be2e285f48ee945d9c8faf75d4f6a66 , < ea32b27e2f8c58c92bff5ecba7fcf64b97707089 (git)
Affected: ae9e557b5be2e285f48ee945d9c8faf75d4f6a66 , < 2390095113e98fc52fffe35c5206d30d9efe3f78 (git)
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    Linux Linux Affected: 5.5
Unaffected: 0 , < 5.5 (semver)
Unaffected: 5.10.128 , ≤ 5.10.* (semver)
Unaffected: 5.15.52 , ≤ 5.15.* (semver)
Unaffected: 5.18.9 , ≤ 5.18.* (semver)
Unaffected: 5.19 , ≤ * (original_commit_for_fix)
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntick/nohz: unexport __init-annotated tick_nohz_full_setup()\n\nEXPORT_SYMBOL and __init is a bad combination because the .init.text\nsection is freed up after the initialization. Hence, modules cannot\nuse symbols annotated __init. The access to a freed symbol may end up\nwith kernel panic.\n\nmodpost used to detect it, but it had been broken for a decade.\n\nCommit 28438794aba4 (\"modpost: fix section mismatch check for exported\ninit/exit sections\") fixed it so modpost started to warn it again, then\nthis showed up:\n\n    MODPOST vmlinux.symvers\n  WARNING: modpost: vmlinux.o(___ksymtab_gpl+tick_nohz_full_setup+0x0): Section mismatch in reference from the variable __ksymtab_tick_nohz_full_setup to the function .init.text:tick_nohz_full_setup()\n  The symbol tick_nohz_full_setup is exported and annotated __init\n  Fix this by removing the __init annotation of tick_nohz_full_setup or drop the export.\n\nDrop the export because tick_nohz_full_setup() is only called from the\nbuilt-in code in kernel/sched/isolation.c."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T08:43:04.795Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/c4ff3ffe0138234774602152fe67e3a898c615c6"
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        },
        {
          "url": "https://git.kernel.org/stable/c/2390095113e98fc52fffe35c5206d30d9efe3f78"
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      ],
      "title": "tick/nohz: unexport __init-annotated tick_nohz_full_setup()",
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    "cveId": "CVE-2022-49675",
    "datePublished": "2025-02-26T02:24:07.395Z",
    "dateReserved": "2025-02-26T02:21:30.438Z",
    "dateUpdated": "2025-05-04T08:43:04.795Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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