cve-2024-50199
Vulnerability from cvelistv5
Published
2024-11-08 05:54
Modified
2024-12-19 09:35
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/swapfile: skip HugeTLB pages for unuse_vma I got a bad pud error and lost a 1GB HugeTLB when calling swapoff. The problem can be reproduced by the following steps: 1. Allocate an anonymous 1GB HugeTLB and some other anonymous memory. 2. Swapout the above anonymous memory. 3. run swapoff and we will get a bad pud error in kernel message: mm/pgtable-generic.c:42: bad pud 00000000743d215d(84000001400000e7) We can tell that pud_clear_bad is called by pud_none_or_clear_bad in unuse_pud_range() by ftrace. And therefore the HugeTLB pages will never be freed because we lost it from page table. We can skip HugeTLB pages for unuse_vma to fix it.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/417d5838ca73c6331ae2fe692fab6c25c00d9a0b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6ec0fe3756f941f42f8c57156b8bdf2877b2ebaf
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7528c4fb1237512ee18049f852f014eba80bbe8d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ba7f982cdb37ff5a7739dec85d7325ea66fc1496
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bed2b9037806c62166a0ef9a559a1e7e3e1275b8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e41710f5a61aca9d6baaa8f53908a927dd9e7aa7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/eb66a833cdd2f7302ee05d05e0fa12a2ca32eb87
Impacted products
Vendor Product Version
Linux Linux Version: 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f
Version: 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f
Version: 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f
Version: 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f
Version: 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f
Version: 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f
Version: 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f
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   Linux Linux Version: 2.6.36
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{
   containers: {
      cna: {
         affected: [
            {
               defaultStatus: "unaffected",
               product: "Linux",
               programFiles: [
                  "mm/swapfile.c",
               ],
               repo: "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               vendor: "Linux",
               versions: [
                  {
                     lessThan: "ba7f982cdb37ff5a7739dec85d7325ea66fc1496",
                     status: "affected",
                     version: "0fe6e20b9c4c53b3e97096ee73a0857f60aad43f",
                     versionType: "git",
                  },
                  {
                     lessThan: "417d5838ca73c6331ae2fe692fab6c25c00d9a0b",
                     status: "affected",
                     version: "0fe6e20b9c4c53b3e97096ee73a0857f60aad43f",
                     versionType: "git",
                  },
                  {
                     lessThan: "e41710f5a61aca9d6baaa8f53908a927dd9e7aa7",
                     status: "affected",
                     version: "0fe6e20b9c4c53b3e97096ee73a0857f60aad43f",
                     versionType: "git",
                  },
                  {
                     lessThan: "6ec0fe3756f941f42f8c57156b8bdf2877b2ebaf",
                     status: "affected",
                     version: "0fe6e20b9c4c53b3e97096ee73a0857f60aad43f",
                     versionType: "git",
                  },
                  {
                     lessThan: "bed2b9037806c62166a0ef9a559a1e7e3e1275b8",
                     status: "affected",
                     version: "0fe6e20b9c4c53b3e97096ee73a0857f60aad43f",
                     versionType: "git",
                  },
                  {
                     lessThan: "eb66a833cdd2f7302ee05d05e0fa12a2ca32eb87",
                     status: "affected",
                     version: "0fe6e20b9c4c53b3e97096ee73a0857f60aad43f",
                     versionType: "git",
                  },
                  {
                     lessThan: "7528c4fb1237512ee18049f852f014eba80bbe8d",
                     status: "affected",
                     version: "0fe6e20b9c4c53b3e97096ee73a0857f60aad43f",
                     versionType: "git",
                  },
               ],
            },
            {
               defaultStatus: "affected",
               product: "Linux",
               programFiles: [
                  "mm/swapfile.c",
               ],
               repo: "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               vendor: "Linux",
               versions: [
                  {
                     status: "affected",
                     version: "2.6.36",
                  },
                  {
                     lessThan: "2.6.36",
                     status: "unaffected",
                     version: "0",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "5.4.*",
                     status: "unaffected",
                     version: "5.4.285",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "5.10.*",
                     status: "unaffected",
                     version: "5.10.228",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "5.15.*",
                     status: "unaffected",
                     version: "5.15.169",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "6.1.*",
                     status: "unaffected",
                     version: "6.1.114",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "6.6.*",
                     status: "unaffected",
                     version: "6.6.58",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "6.11.*",
                     status: "unaffected",
                     version: "6.11.5",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "*",
                     status: "unaffected",
                     version: "6.12",
                     versionType: "original_commit_for_fix",
                  },
               ],
            },
         ],
         descriptions: [
            {
               lang: "en",
               value: "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/swapfile: skip HugeTLB pages for unuse_vma\n\nI got a bad pud error and lost a 1GB HugeTLB when calling swapoff.  The\nproblem can be reproduced by the following steps:\n\n 1. Allocate an anonymous 1GB HugeTLB and some other anonymous memory.\n 2. Swapout the above anonymous memory.\n 3. run swapoff and we will get a bad pud error in kernel message:\n\n  mm/pgtable-generic.c:42: bad pud 00000000743d215d(84000001400000e7)\n\nWe can tell that pud_clear_bad is called by pud_none_or_clear_bad in\nunuse_pud_range() by ftrace.  And therefore the HugeTLB pages will never\nbe freed because we lost it from page table.  We can skip HugeTLB pages\nfor unuse_vma to fix it.",
            },
         ],
         providerMetadata: {
            dateUpdated: "2024-12-19T09:35:17.975Z",
            orgId: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            shortName: "Linux",
         },
         references: [
            {
               url: "https://git.kernel.org/stable/c/ba7f982cdb37ff5a7739dec85d7325ea66fc1496",
            },
            {
               url: "https://git.kernel.org/stable/c/417d5838ca73c6331ae2fe692fab6c25c00d9a0b",
            },
            {
               url: "https://git.kernel.org/stable/c/e41710f5a61aca9d6baaa8f53908a927dd9e7aa7",
            },
            {
               url: "https://git.kernel.org/stable/c/6ec0fe3756f941f42f8c57156b8bdf2877b2ebaf",
            },
            {
               url: "https://git.kernel.org/stable/c/bed2b9037806c62166a0ef9a559a1e7e3e1275b8",
            },
            {
               url: "https://git.kernel.org/stable/c/eb66a833cdd2f7302ee05d05e0fa12a2ca32eb87",
            },
            {
               url: "https://git.kernel.org/stable/c/7528c4fb1237512ee18049f852f014eba80bbe8d",
            },
         ],
         title: "mm/swapfile: skip HugeTLB pages for unuse_vma",
         x_generator: {
            engine: "bippy-5f407fcff5a0",
         },
      },
   },
   cveMetadata: {
      assignerOrgId: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      assignerShortName: "Linux",
      cveId: "CVE-2024-50199",
      datePublished: "2024-11-08T05:54:13.403Z",
      dateReserved: "2024-10-21T19:36:19.969Z",
      dateUpdated: "2024-12-19T09:35:17.975Z",
      state: "PUBLISHED",
   },
   dataType: "CVE_RECORD",
   dataVersion: "5.1",
   "vulnerability-lookup:meta": {
      nvd: "{\"cve\":{\"id\":\"CVE-2024-50199\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-11-08T06:15:16.527\",\"lastModified\":\"2024-11-08T19:01:03.880\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmm/swapfile: skip HugeTLB pages for unuse_vma\\n\\nI got a bad pud error and lost a 1GB HugeTLB when calling swapoff.  The\\nproblem can be reproduced by the following steps:\\n\\n 1. Allocate an anonymous 1GB HugeTLB and some other anonymous memory.\\n 2. Swapout the above anonymous memory.\\n 3. run swapoff and we will get a bad pud error in kernel message:\\n\\n  mm/pgtable-generic.c:42: bad pud 00000000743d215d(84000001400000e7)\\n\\nWe can tell that pud_clear_bad is called by pud_none_or_clear_bad in\\nunuse_pud_range() by ftrace.  And therefore the HugeTLB pages will never\\nbe freed because we lost it from page table.  We can skip HugeTLB pages\\nfor unuse_vma to fix it.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm/swapfile: omitir páginas HugeTLB para unuse_vma Obtuve un error pud incorrecto y perdí un HugeTLB de 1 GB al llamar a swapoff. El problema se puede reproducir mediante los siguientes pasos: 1. Asignar un HugeTLB anónimo de 1 GB y otra memoria anónima. 2. Intercambiar la memoria anónima anterior. 3. Ejecutar swapoff y obtendremos un error pud incorrecto en el mensaje del kernel: mm/pgtable-generic.c:42: bad pud 00000000743d215d(84000001400000e7) Podemos decir que pud_clear_bad es llamado por pud_none_or_clear_bad en unuse_pud_range() por ftrace. Y por lo tanto, las páginas HugeTLB nunca se liberarán porque las perdimos de la tabla de páginas. Podemos omitir las páginas HugeTLB para unuse_vma para solucionarlo.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/417d5838ca73c6331ae2fe692fab6c25c00d9a0b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6ec0fe3756f941f42f8c57156b8bdf2877b2ebaf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7528c4fb1237512ee18049f852f014eba80bbe8d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ba7f982cdb37ff5a7739dec85d7325ea66fc1496\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bed2b9037806c62166a0ef9a559a1e7e3e1275b8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e41710f5a61aca9d6baaa8f53908a927dd9e7aa7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/eb66a833cdd2f7302ee05d05e0fa12a2ca32eb87\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
   },
}


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