CVE-2022-49771 (GCVE-0-2022-49771)

Vulnerability from cvelistv5 – Published: 2025-05-01 14:09 – Updated: 2025-12-23 13:25
VLAI?
Title
dm ioctl: fix misbehavior if list_versions races with module loading
Summary
In the Linux kernel, the following vulnerability has been resolved: dm ioctl: fix misbehavior if list_versions races with module loading __list_versions will first estimate the required space using the "dm_target_iterate(list_version_get_needed, &needed)" call and then will fill the space using the "dm_target_iterate(list_version_get_info, &iter_info)" call. Each of these calls locks the targets using the "down_read(&_lock)" and "up_read(&_lock)" calls, however between the first and second "dm_target_iterate" there is no lock held and the target modules can be loaded at this point, so the second "dm_target_iterate" call may need more space than what was the first "dm_target_iterate" returned. The code tries to handle this overflow (see the beginning of list_version_get_info), however this handling is incorrect. The code sets "param->data_size = param->data_start + needed" and "iter_info.end = (char *)vers+len" - "needed" is the size returned by the first dm_target_iterate call; "len" is the size of the buffer allocated by userspace. "len" may be greater than "needed"; in this case, the code will write up to "len" bytes into the buffer, however param->data_size is set to "needed", so it may write data past the param->data_size value. The ioctl interface copies only up to param->data_size into userspace, thus part of the result will be truncated. Fix this bug by setting "iter_info.end = (char *)vers + needed;" - this guarantees that the second "dm_target_iterate" call will write only up to the "needed" buffer and it will exit with "DM_BUFFER_FULL_FLAG" if it overflows the "needed" space - in this case, userspace will allocate a larger buffer and retry. Note that there is also a bug in list_version_get_needed - we need to add "strlen(tt->name) + 1" to the needed size, not "strlen(tt->name)".
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 0c8d4112df329bf3dfbf27693f918c3b08676538 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6a818db0d5aecf80d4ba9e10ac153f60adc629ca (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 3a1c35d72dc0b34d1e746ed705790c0f630aa427 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b545c0e1e4094d4de2bdfe9a3823f9154b0c0005 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f59f5a269ca5e43c567aca7f1f52500a0186e9b7 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6ffce7a92ef5c68f7e5d6f4d722c2f96280c064b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5398b8e275bf81a2517b327d216c0f37ac9ac5ae (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4fe1ec995483737f3d2a14c3fe1d8fe634972979 (git)
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    Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 4.9.334 , ≤ 4.9.* (semver)
Unaffected: 4.14.300 , ≤ 4.14.* (semver)
Unaffected: 4.19.267 , ≤ 4.19.* (semver)
Unaffected: 5.4.225 , ≤ 5.4.* (semver)
Unaffected: 5.10.156 , ≤ 5.10.* (semver)
Unaffected: 5.15.80 , ≤ 5.15.* (semver)
Unaffected: 6.0.10 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm ioctl: fix misbehavior if list_versions races with module loading\n\n__list_versions will first estimate the required space using the\n\"dm_target_iterate(list_version_get_needed, \u0026needed)\" call and then will\nfill the space using the \"dm_target_iterate(list_version_get_info,\n\u0026iter_info)\" call. Each of these calls locks the targets using the\n\"down_read(\u0026_lock)\" and \"up_read(\u0026_lock)\" calls, however between the first\nand second \"dm_target_iterate\" there is no lock held and the target\nmodules can be loaded at this point, so the second \"dm_target_iterate\"\ncall may need more space than what was the first \"dm_target_iterate\"\nreturned.\n\nThe code tries to handle this overflow (see the beginning of\nlist_version_get_info), however this handling is incorrect.\n\nThe code sets \"param-\u003edata_size = param-\u003edata_start + needed\" and\n\"iter_info.end = (char *)vers+len\" - \"needed\" is the size returned by the\nfirst dm_target_iterate call; \"len\" is the size of the buffer allocated by\nuserspace.\n\n\"len\" may be greater than \"needed\"; in this case, the code will write up\nto \"len\" bytes into the buffer, however param-\u003edata_size is set to\n\"needed\", so it may write data past the param-\u003edata_size value. The ioctl\ninterface copies only up to param-\u003edata_size into userspace, thus part of\nthe result will be truncated.\n\nFix this bug by setting \"iter_info.end = (char *)vers + needed;\" - this\nguarantees that the second \"dm_target_iterate\" call will write only up to\nthe \"needed\" buffer and it will exit with \"DM_BUFFER_FULL_FLAG\" if it\noverflows the \"needed\" space - in this case, userspace will allocate a\nlarger buffer and retry.\n\nNote that there is also a bug in list_version_get_needed - we need to add\n\"strlen(tt-\u003ename) + 1\" to the needed size, not \"strlen(tt-\u003ename)\"."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-23T13:25:53.443Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0c8d4112df329bf3dfbf27693f918c3b08676538"
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        {
          "url": "https://git.kernel.org/stable/c/6a818db0d5aecf80d4ba9e10ac153f60adc629ca"
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          "url": "https://git.kernel.org/stable/c/3a1c35d72dc0b34d1e746ed705790c0f630aa427"
        },
        {
          "url": "https://git.kernel.org/stable/c/b545c0e1e4094d4de2bdfe9a3823f9154b0c0005"
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        {
          "url": "https://git.kernel.org/stable/c/5398b8e275bf81a2517b327d216c0f37ac9ac5ae"
        },
        {
          "url": "https://git.kernel.org/stable/c/4fe1ec995483737f3d2a14c3fe1d8fe634972979"
        }
      ],
      "title": "dm ioctl: fix misbehavior if list_versions races with module loading",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49771",
    "datePublished": "2025-05-01T14:09:08.813Z",
    "dateReserved": "2025-04-16T07:17:33.805Z",
    "dateUpdated": "2025-12-23T13:25:53.443Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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