cve-2024-41050
Vulnerability from cvelistv5
Published
2024-07-29 14:32
Modified
2024-12-19 09:10
Severity ?
Summary
cachefiles: cyclic allocation of msg_id to avoid reuse
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/19f4f399091478c95947f6bd7ad61622300c30d9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/35710c6c4a1c64478ec1b5e0e81d386c0844dec6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9d3bf4e9aa23f0d9e99ebe7a94f232ddba54ee17
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/de045a82e1a4e04be62718d3c2981a55150765a0
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

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                "id": "CVE-2024-41050",
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          "product": "Linux",
          "programFiles": [
            "fs/cachefiles/internal.h",
            "fs/cachefiles/ondemand.c"
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          "versions": [
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              "lessThan": "5.19",
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              "version": "0",
              "versionType": "semver"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncachefiles: cyclic allocation of msg_id to avoid reuse\n\nReusing the msg_id after a maliciously completed reopen request may cause\na read request to remain unprocessed and result in a hung, as shown below:\n\n       t1       |      t2       |      t3\n-------------------------------------------------\ncachefiles_ondemand_select_req\n cachefiles_ondemand_object_is_close(A)\n cachefiles_ondemand_set_object_reopening(A)\n queue_work(fscache_object_wq, \u0026info-\u003ework)\n                ondemand_object_worker\n                 cachefiles_ondemand_init_object(A)\n                  cachefiles_ondemand_send_req(OPEN)\n                    // get msg_id 6\n                    wait_for_completion(\u0026req_A-\u003edone)\ncachefiles_ondemand_daemon_read\n // read msg_id 6 req_A\n cachefiles_ondemand_get_fd\n copy_to_user\n                                // Malicious completion msg_id 6\n                                copen 6,-1\n                                cachefiles_ondemand_copen\n                                 complete(\u0026req_A-\u003edone)\n                                 // will not set the object to close\n                                 // because ondemand_id \u0026\u0026 fd is valid.\n\n                // ondemand_object_worker() is done\n                // but the object is still reopening.\n\n                                // new open req_B\n                                cachefiles_ondemand_init_object(B)\n                                 cachefiles_ondemand_send_req(OPEN)\n                                 // reuse msg_id 6\nprocess_open_req\n copen 6,A.size\n // The expected failed copen was executed successfully\n\nExpect copen to fail, and when it does, it closes fd, which sets the\nobject to close, and then close triggers reopen again. However, due to\nmsg_id reuse resulting in a successful copen, the anonymous fd is not\nclosed until the daemon exits. Therefore read requests waiting for reopen\nto complete may trigger hung task.\n\nTo avoid this issue, allocate the msg_id cyclically to avoid reusing the\nmsg_id for a very short duration of time."
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    "assignerShortName": "Linux",
    "cveId": "CVE-2024-41050",
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    "dateReserved": "2024-07-12T12:17:45.626Z",
    "dateUpdated": "2024-12-19T09:10:55.482Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-41050\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-07-29T15:15:13.260\",\"lastModified\":\"2024-07-29T16:21:52.517\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncachefiles: cyclic allocation of msg_id to avoid reuse\\n\\nReusing the msg_id after a maliciously completed reopen request may cause\\na read request to remain unprocessed and result in a hung, as shown below:\\n\\n       t1       |      t2       |      t3\\n-------------------------------------------------\\ncachefiles_ondemand_select_req\\n cachefiles_ondemand_object_is_close(A)\\n cachefiles_ondemand_set_object_reopening(A)\\n queue_work(fscache_object_wq, \u0026info-\u003ework)\\n                ondemand_object_worker\\n                 cachefiles_ondemand_init_object(A)\\n                  cachefiles_ondemand_send_req(OPEN)\\n                    // get msg_id 6\\n                    wait_for_completion(\u0026req_A-\u003edone)\\ncachefiles_ondemand_daemon_read\\n // read msg_id 6 req_A\\n cachefiles_ondemand_get_fd\\n copy_to_user\\n                                // Malicious completion msg_id 6\\n                                copen 6,-1\\n                                cachefiles_ondemand_copen\\n                                 complete(\u0026req_A-\u003edone)\\n                                 // will not set the object to close\\n                                 // because ondemand_id \u0026\u0026 fd is valid.\\n\\n                // ondemand_object_worker() is done\\n                // but the object is still reopening.\\n\\n                                // new open req_B\\n                                cachefiles_ondemand_init_object(B)\\n                                 cachefiles_ondemand_send_req(OPEN)\\n                                 // reuse msg_id 6\\nprocess_open_req\\n copen 6,A.size\\n // The expected failed copen was executed successfully\\n\\nExpect copen to fail, and when it does, it closes fd, which sets the\\nobject to close, and then close triggers reopen again. However, due to\\nmsg_id reuse resulting in a successful copen, the anonymous fd is not\\nclosed until the daemon exits. Therefore read requests waiting for reopen\\nto complete may trigger hung task.\\n\\nTo avoid this issue, allocate the msg_id cyclically to avoid reusing the\\nmsg_id for a very short duration of time.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: archivos de cach\u00e9: asignaci\u00f3n c\u00edclica de msg_id para evitar la reutilizaci\u00f3n La reutilizaci\u00f3n de msg_id despu\u00e9s de una solicitud de reapertura completada maliciosamente puede causar que una solicitud de lectura permanezca sin procesar y resulte en un bloqueo, como se muestra a continuaci\u00f3n: t1 | t2 | t3 ------------------------------------------------- cachefiles_ondemand_select_req cachefiles_ondemand_object_is_close(A) cachefiles_ondemand_set_object_reopening(A) queue_work(fscache_object_wq, \u0026amp;info-\u0026gt;work) ondemand_object_worker cachefiles_ondemand_init_object(A) cachefiles_ondemand_send_req(OPEN) // obtener msg_id 6 _completion(\u0026amp;req_A-\u0026gt;done) cachefiles_ondemand_daemon_read // leer msg_id 6 req_A cachefiles_ondemand_get_fd copy_to_user // Finalizaci\u00f3n maliciosa msg_id 6 copen 6,-1 cachefiles_ondemand_copen complete(\u0026amp;req_A-\u0026gt;done) // no configurar\u00e1 el objeto para que se cierre // porque ondemand_id \u0026amp;\u0026amp; fd es v\u00e1lido. // ondemand_object_worker() est\u00e1 listo // pero el objeto a\u00fan se est\u00e1 reabriendo. // new open req_B cachefiles_ondemand_init_object(B) cachefiles_ondemand_send_req(OPEN) // reutilizar msg_id 6 process_open_req copen 6,A.size // El copen fallido esperado se ejecut\u00f3 con \u00e9xito Se espera que copen falle y, cuando lo hace, cierra fd, lo que establece el objeto se cierra y luego el cierre activa nuevamente. Sin embargo, debido a que la reutilizaci\u00f3n de msg_id da como resultado un copen exitoso, el fd an\u00f3nimo no se cierra hasta que el demonio sale. Por lo tanto, las solicitudes de lectura que esperan que se complete la reapertura pueden desencadenar una tarea colgada. Para evitar este problema, asigne msg_id c\u00edclicamente para evitar reutilizar msg_id durante un per\u00edodo de tiempo muy corto.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/19f4f399091478c95947f6bd7ad61622300c30d9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/35710c6c4a1c64478ec1b5e0e81d386c0844dec6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9d3bf4e9aa23f0d9e99ebe7a94f232ddba54ee17\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/de045a82e1a4e04be62718d3c2981a55150765a0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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}


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