cve-2023-52854
Vulnerability from cvelistv5
Published
2024-05-21 15:31
Modified
2024-12-19 08:27
Severity ?
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/0dd34a7ad395dbcf6ae60e48e9786050e25b9bc5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1734a79e951914f1db2c65e635012a35db1c674b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1e901bcb8af19416b65f5063a4af7996e5a51d7f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/41aad9d6953984d134fc50f631f24ef476875d4d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7ddc21e317b360c3444de3023bcc83b85fabae2f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c7c26d0ef5d20f00dbb2ae3befcabbe0efa77275
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/0dd34a7ad395dbcf6ae60e48e9786050e25b9bc5
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/1734a79e951914f1db2c65e635012a35db1c674b
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/1e901bcb8af19416b65f5063a4af7996e5a51d7f
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/41aad9d6953984d134fc50f631f24ef476875d4d
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7ddc21e317b360c3444de3023bcc83b85fabae2f
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c7c26d0ef5d20f00dbb2ae3befcabbe0efa77275
Impacted products
Vendor Product Version
Linux Linux Version: 5.6
Show details on NVD website

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    "nvd": "{\"cve\":{\"id\":\"CVE-2023-52854\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T16:15:22.377\",\"lastModified\":\"2024-11-21T08:40:43.647\",\"vulnStatus\":\"Awaiting Analysis\",\"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`.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0dd34a7ad395dbcf6ae60e48e9786050e25b9bc5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1734a79e951914f1db2c65e635012a35db1c674b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1e901bcb8af19416b65f5063a4af7996e5a51d7f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/41aad9d6953984d134fc50f631f24ef476875d4d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7ddc21e317b360c3444de3023bcc83b85fabae2f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c7c26d0ef5d20f00dbb2ae3befcabbe0efa77275\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0dd34a7ad395dbcf6ae60e48e9786050e25b9bc5\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/1734a79e951914f1db2c65e635012a35db1c674b\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/1e901bcb8af19416b65f5063a4af7996e5a51d7f\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/41aad9d6953984d134fc50f631f24ef476875d4d\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/7ddc21e317b360c3444de3023bcc83b85fabae2f\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/c7c26d0ef5d20f00dbb2ae3befcabbe0efa77275\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
  }
}


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