fkie_cve-2023-52854
Vulnerability from fkie_nvd
Published
2024-05-21 16:15
Modified
2025-02-03 16:13
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: padata: Fix refcnt handling in padata_free_shell() In a high-load arm64 environment, the pcrypt_aead01 test in LTP can lead to system UAF (Use-After-Free) issues. Due to the lengthy analysis of the pcrypt_aead01 function call, I'll describe the problem scenario using a simplified model: Suppose there's a user of padata named `user_function` that adheres to the padata requirement of calling `padata_free_shell` after `serial()` has been invoked, as demonstrated in the following code: ```c struct request { struct padata_priv padata; struct completion *done; }; void parallel(struct padata_priv *padata) { do_something(); } void serial(struct padata_priv *padata) { struct request *request = container_of(padata, struct request, padata); complete(request->done); } void user_function() { DECLARE_COMPLETION(done) padata->parallel = parallel; padata->serial = serial; padata_do_parallel(); wait_for_completion(&done); padata_free_shell(); } ``` In the corresponding padata.c file, there's the following code: ```c static void padata_serial_worker(struct work_struct *serial_work) { ... cnt = 0; while (!list_empty(&local_list)) { ... padata->serial(padata); cnt++; } local_bh_enable(); if (refcount_sub_and_test(cnt, &pd->refcnt)) padata_free_pd(pd); } ``` Because of the high system load and the accumulation of unexecuted softirq at this moment, `local_bh_enable()` in padata takes longer to execute than usual. Subsequently, when accessing `pd->refcnt`, `pd` has already been released by `padata_free_shell()`, resulting in a UAF issue with `pd->refcnt`. The fix is straightforward: add `refcount_dec_and_test` before calling `padata_free_pd` in `padata_free_shell`.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0dd34a7ad395dbcf6ae60e48e9786050e25b9bc5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1734a79e951914f1db2c65e635012a35db1c674bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1e901bcb8af19416b65f5063a4af7996e5a51d7fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/41aad9d6953984d134fc50f631f24ef476875d4dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7ddc21e317b360c3444de3023bcc83b85fabae2fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c7c26d0ef5d20f00dbb2ae3befcabbe0efa77275Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/0dd34a7ad395dbcf6ae60e48e9786050e25b9bc5Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/1734a79e951914f1db2c65e635012a35db1c674bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/1e901bcb8af19416b65f5063a4af7996e5a51d7fPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/41aad9d6953984d134fc50f631f24ef476875d4dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7ddc21e317b360c3444de3023bcc83b85fabae2fPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c7c26d0ef5d20f00dbb2ae3befcabbe0efa77275Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *


To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npadata: Fix refcnt handling in padata_free_shell()\n\nIn a high-load arm64 environment, the pcrypt_aead01 test in LTP can lead\nto system UAF (Use-After-Free) issues. Due to the lengthy analysis of\nthe pcrypt_aead01 function call, I\u0027ll describe the problem scenario\nusing a simplified model:\n\nSuppose there\u0027s a user of padata named `user_function` that adheres to\nthe padata requirement of calling `padata_free_shell` after `serial()`\nhas been invoked, as demonstrated in the following code:\n\n```c\nstruct request {\n    struct padata_priv padata;\n    struct completion *done;\n};\n\nvoid parallel(struct padata_priv *padata) {\n    do_something();\n}\n\nvoid serial(struct padata_priv *padata) {\n    struct request *request = container_of(padata,\n    \t\t\t\tstruct request,\n\t\t\t\tpadata);\n    complete(request-\u003edone);\n}\n\nvoid user_function() {\n    DECLARE_COMPLETION(done)\n    padata-\u003eparallel = parallel;\n    padata-\u003eserial = serial;\n    padata_do_parallel();\n    wait_for_completion(\u0026done);\n    padata_free_shell();\n}\n```\n\nIn the corresponding padata.c file, there\u0027s the following code:\n\n```c\nstatic void padata_serial_worker(struct work_struct *serial_work) {\n    ...\n    cnt = 0;\n\n    while (!list_empty(\u0026local_list)) {\n        ...\n        padata-\u003eserial(padata);\n        cnt++;\n    }\n\n    local_bh_enable();\n\n    if (refcount_sub_and_test(cnt, \u0026pd-\u003erefcnt))\n        padata_free_pd(pd);\n}\n```\n\nBecause of the high system load and the accumulation of unexecuted\nsoftirq at this moment, `local_bh_enable()` in padata takes longer\nto execute than usual. Subsequently, when accessing `pd-\u003erefcnt`,\n`pd` has already been released by `padata_free_shell()`, resulting\nin a UAF issue with `pd-\u003erefcnt`.\n\nThe fix is straightforward: add `refcount_dec_and_test` before calling\n`padata_free_pd` in `padata_free_shell`."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: padata: corrige el manejo de refcnt en padata_free_shell(). En un entorno arm64 de alta carga, la prueba pcrypt_aead01 en LTP puede provocar problemas de UAF (Use-After-Free) del sistema. Debido al extenso an\u00e1lisis de la llamada a la funci\u00f3n pcrypt_aead01, describir\u00e9 el escenario del problema usando un modelo simplificado: supongamos que hay un usuario de padata llamado `user_function` que cumple con el requisito de padata de llamar a `padata_free_shell` despu\u00e9s de `serial()`. ha sido invocado, como se demuestra en el siguiente c\u00f3digo: ```c struct request { struct padata_priv padata; finalizaci\u00f3n de la estructura *hecho; }; void paralelo(struct padata_priv *padata) { hacer_algo(); } void serial(struct padata_priv *padata) { solicitud de estructura *request = container_of(padata, solicitud de estructura, padata); completar(solicitud-\u0026gt;hecho); } void user_function() { DECLARE_COMPLETION(hecho) padata-\u0026gt;parallel = parallel; padata-\u0026gt;serial = serial; padata_do_parallel(); wait_for_completion(\u0026amp;hecho); padata_free_shell(); } ``` En el archivo padata.c correspondiente, hay el siguiente c\u00f3digo: ```c static void padata_serial_worker(struct work_struct *serial_work) { ... cnt = 0; while (!list_empty(\u0026amp;local_list)) { ... padata-\u0026gt;serial(padata); cnt++; } local_bh_enable(); if (refcount_sub_and_test(cnt, \u0026amp;pd-\u0026gt;refcnt)) padata_free_pd(pd); } ``` Debido a la alta carga del sistema y la acumulaci\u00f3n de software no ejecutado en este momento, `local_bh_enable()` en padata tarda m\u00e1s de lo habitual en ejecutarse. Posteriormente, al acceder a `pd-\u0026gt;refcnt`, `pd` ya ha sido liberado por `padata_free_shell()`, lo que genera un problema de UAF con `pd-\u0026gt;refcnt`. La soluci\u00f3n es sencilla: agregue `refcount_dec_and_test` antes de llamar a `padata_free_pd` en `padata_free_shell`."
    }
  ],
  "id": "CVE-2023-52854",
  "lastModified": "2025-02-03T16:13:08.960",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2024-05-21T16:15:22.377",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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