cve-2024-56755
Vulnerability from cvelistv5
Published
2024-12-29 11:30
Modified
2025-01-20 06:27
Severity ?
EPSS score ?
0.03% (0.04916)
Summary
In the Linux kernel, the following vulnerability has been resolved: netfs/fscache: Add a memory barrier for FSCACHE_VOLUME_CREATING In fscache_create_volume(), there is a missing memory barrier between the bit-clearing operation and the wake-up operation. This may cause a situation where, after a wake-up, the bit-clearing operation hasn't been detected yet, leading to an indefinite wait. The triggering process is as follows: [cookie1] [cookie2] [volume_work] fscache_perform_lookup fscache_create_volume fscache_perform_lookup fscache_create_volume fscache_create_volume_work cachefiles_acquire_volume clear_and_wake_up_bit test_and_set_bit test_and_set_bit goto maybe_wait goto no_wait In the above process, cookie1 and cookie2 has the same volume. When cookie1 enters the -no_wait- process, it will clear the bit and wake up the waiting process. If a barrier is missing, it may cause cookie2 to remain in the -wait- process indefinitely. In commit 3288666c7256 ("fscache: Use clear_and_wake_up_bit() in fscache_create_volume_work()"), barriers were added to similar operations in fscache_create_volume_work(), but fscache_create_volume() was missed. By combining the clear and wake operations into clear_and_wake_up_bit() to fix this issue.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/22f9400a6f3560629478e0a64247b8fcc811a24dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/539fabba965e119b98066fc6ba5257b5eaf4eda2Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8beb682cc9a0798a280bbb95e3e41617237090b2Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8cc1df3113cb71a0df2c46dd5b102c9e11c8a8c6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ddab02607eed9e415dc62fde421d4329e5345315Patch
Impacted products
Vendor Product Version
Linux Linux Version: bfa22da3ed652aa15acd4246fa13a0de6dbe4a59
Version: bfa22da3ed652aa15acd4246fa13a0de6dbe4a59
Version: bfa22da3ed652aa15acd4246fa13a0de6dbe4a59
Version: bfa22da3ed652aa15acd4246fa13a0de6dbe4a59
Version: bfa22da3ed652aa15acd4246fa13a0de6dbe4a59
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   Linux Linux Version: 5.17
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{
   containers: {
      cna: {
         affected: [
            {
               defaultStatus: "unaffected",
               product: "Linux",
               programFiles: [
                  "fs/netfs/fscache_volume.c",
               ],
               repo: "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               vendor: "Linux",
               versions: [
                  {
                     lessThan: "ddab02607eed9e415dc62fde421d4329e5345315",
                     status: "affected",
                     version: "bfa22da3ed652aa15acd4246fa13a0de6dbe4a59",
                     versionType: "git",
                  },
                  {
                     lessThan: "539fabba965e119b98066fc6ba5257b5eaf4eda2",
                     status: "affected",
                     version: "bfa22da3ed652aa15acd4246fa13a0de6dbe4a59",
                     versionType: "git",
                  },
                  {
                     lessThan: "8beb682cc9a0798a280bbb95e3e41617237090b2",
                     status: "affected",
                     version: "bfa22da3ed652aa15acd4246fa13a0de6dbe4a59",
                     versionType: "git",
                  },
                  {
                     lessThan: "8cc1df3113cb71a0df2c46dd5b102c9e11c8a8c6",
                     status: "affected",
                     version: "bfa22da3ed652aa15acd4246fa13a0de6dbe4a59",
                     versionType: "git",
                  },
                  {
                     lessThan: "22f9400a6f3560629478e0a64247b8fcc811a24d",
                     status: "affected",
                     version: "bfa22da3ed652aa15acd4246fa13a0de6dbe4a59",
                     versionType: "git",
                  },
               ],
            },
            {
               defaultStatus: "affected",
               product: "Linux",
               programFiles: [
                  "fs/netfs/fscache_volume.c",
               ],
               repo: "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               vendor: "Linux",
               versions: [
                  {
                     status: "affected",
                     version: "5.17",
                  },
                  {
                     lessThan: "5.17",
                     status: "unaffected",
                     version: "0",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "6.1.*",
                     status: "unaffected",
                     version: "6.1.120",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "6.6.*",
                     status: "unaffected",
                     version: "6.6.64",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "6.11.*",
                     status: "unaffected",
                     version: "6.11.11",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "6.12.*",
                     status: "unaffected",
                     version: "6.12.2",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "*",
                     status: "unaffected",
                     version: "6.13",
                     versionType: "original_commit_for_fix",
                  },
               ],
            },
         ],
         descriptions: [
            {
               lang: "en",
               value: "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs/fscache: Add a memory barrier for FSCACHE_VOLUME_CREATING\n\nIn fscache_create_volume(), there is a missing memory barrier between the\nbit-clearing operation and the wake-up operation. This may cause a\nsituation where, after a wake-up, the bit-clearing operation hasn't been\ndetected yet, leading to an indefinite wait. The triggering process is as\nfollows:\n\n  [cookie1]                [cookie2]                  [volume_work]\nfscache_perform_lookup\n  fscache_create_volume\n                        fscache_perform_lookup\n                          fscache_create_volume\n\t\t\t                        fscache_create_volume_work\n                                                  cachefiles_acquire_volume\n                                                  clear_and_wake_up_bit\n    test_and_set_bit\n                            test_and_set_bit\n                              goto maybe_wait\n      goto no_wait\n\nIn the above process, cookie1 and cookie2 has the same volume. When cookie1\nenters the -no_wait- process, it will clear the bit and wake up the waiting\nprocess. If a barrier is missing, it may cause cookie2 to remain in the\n-wait- process indefinitely.\n\nIn commit 3288666c7256 (\"fscache: Use clear_and_wake_up_bit() in\nfscache_create_volume_work()\"), barriers were added to similar operations\nin fscache_create_volume_work(), but fscache_create_volume() was missed.\n\nBy combining the clear and wake operations into clear_and_wake_up_bit() to\nfix this issue.",
            },
         ],
         providerMetadata: {
            dateUpdated: "2025-01-20T06:27:28.117Z",
            orgId: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            shortName: "Linux",
         },
         references: [
            {
               url: "https://git.kernel.org/stable/c/ddab02607eed9e415dc62fde421d4329e5345315",
            },
            {
               url: "https://git.kernel.org/stable/c/539fabba965e119b98066fc6ba5257b5eaf4eda2",
            },
            {
               url: "https://git.kernel.org/stable/c/8beb682cc9a0798a280bbb95e3e41617237090b2",
            },
            {
               url: "https://git.kernel.org/stable/c/8cc1df3113cb71a0df2c46dd5b102c9e11c8a8c6",
            },
            {
               url: "https://git.kernel.org/stable/c/22f9400a6f3560629478e0a64247b8fcc811a24d",
            },
         ],
         title: "netfs/fscache: Add a memory barrier for FSCACHE_VOLUME_CREATING",
         x_generator: {
            engine: "bippy-5f407fcff5a0",
         },
      },
   },
   cveMetadata: {
      assignerOrgId: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      assignerShortName: "Linux",
      cveId: "CVE-2024-56755",
      datePublished: "2024-12-29T11:30:19.795Z",
      dateReserved: "2024-12-29T11:26:39.760Z",
      dateUpdated: "2025-01-20T06:27:28.117Z",
      state: "PUBLISHED",
   },
   dataType: "CVE_RECORD",
   dataVersion: "5.1",
   "vulnerability-lookup:meta": {
      nvd: "{\"cve\":{\"id\":\"CVE-2024-56755\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-12-29T12:15:09.077\",\"lastModified\":\"2025-01-06T20:26:39.200\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnetfs/fscache: Add a memory barrier for FSCACHE_VOLUME_CREATING\\n\\nIn fscache_create_volume(), there is a missing memory barrier between the\\nbit-clearing operation and the wake-up operation. This may cause a\\nsituation where, after a wake-up, the bit-clearing operation hasn't been\\ndetected yet, leading to an indefinite wait. The triggering process is as\\nfollows:\\n\\n  [cookie1]                [cookie2]                  [volume_work]\\nfscache_perform_lookup\\n  fscache_create_volume\\n                        fscache_perform_lookup\\n                          fscache_create_volume\\n\\t\\t\\t                        fscache_create_volume_work\\n                                                  cachefiles_acquire_volume\\n                                                  clear_and_wake_up_bit\\n    test_and_set_bit\\n                            test_and_set_bit\\n                              goto maybe_wait\\n      goto no_wait\\n\\nIn the above process, cookie1 and cookie2 has the same volume. When cookie1\\nenters the -no_wait- process, it will clear the bit and wake up the waiting\\nprocess. If a barrier is missing, it may cause cookie2 to remain in the\\n-wait- process indefinitely.\\n\\nIn commit 3288666c7256 (\\\"fscache: Use clear_and_wake_up_bit() in\\nfscache_create_volume_work()\\\"), barriers were added to similar operations\\nin fscache_create_volume_work(), but fscache_create_volume() was missed.\\n\\nBy combining the clear and wake operations into clear_and_wake_up_bit() to\\nfix this issue.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfs/fscache: Agregar una barrera de memoria para FSCACHE_VOLUME_CREATING En fscache_create_volume(), falta una barrera de memoria entre la operación de desinfección de bits y la operación de activación. Esto puede provocar una situación en la que, después de una activación, la operación de desinfección de bits aún no se haya detectado, lo que lleva a una espera indefinida. El proceso de activación es el siguiente: [cookie1] [cookie2] [volume_work] fscache_perform_lookup fscache_create_volume fscache_perform_lookup fscache_create_volume fscache_create_volume_work cachefiles_acquire_volume clear_and_wake_up_bit test_and_set_bit test_and_set_bit goto maybe_wait goto no_wait En el proceso anterior, cookie1 y cookie2 tienen el mismo volumen. Cuando cookie1 ingresa al proceso -no_wait-, borrará el bit y activará el proceso en espera. Si falta una barrera, puede provocar que cookie2 permanezca en el proceso -wait- indefinidamente. En el commit 3288666c7256 (\\\"fscache: Use clear_and_wake_up_bit() in fscache_create_volume_work()\\\"), se agregaron barreras a operaciones similares en fscache_create_volume_work(), pero se omitió fscache_create_volume(). Al combinar las operaciones clear y wake en clear_and_wake_up_bit() se solucionó este problema.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-401\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.17\",\"versionEndExcluding\":\"6.1.120\",\"matchCriteriaId\":\"DFA9B856-F80A-4A22-BC26-5EB65D554687\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.64\",\"matchCriteriaId\":\"CA16DEE3-ABEC-4449-9F4A-7A3DC4FC36C7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.11.11\",\"matchCriteriaId\":\"21434379-192D-472F-9B54-D45E3650E893\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.12\",\"versionEndExcluding\":\"6.12.2\",\"matchCriteriaId\":\"D8882B1B-2ABC-4838-AC1D-DBDBB5764776\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/22f9400a6f3560629478e0a64247b8fcc811a24d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/539fabba965e119b98066fc6ba5257b5eaf4eda2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8beb682cc9a0798a280bbb95e3e41617237090b2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8cc1df3113cb71a0df2c46dd5b102c9e11c8a8c6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ddab02607eed9e415dc62fde421d4329e5345315\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
   },
}


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