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/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 Version: 07928d9bfc81640bab36f5190e8725894d93b659
Version: 07928d9bfc81640bab36f5190e8725894d93b659
Version: 07928d9bfc81640bab36f5190e8725894d93b659
Version: 07928d9bfc81640bab36f5190e8725894d93b659
Version: 07928d9bfc81640bab36f5190e8725894d93b659
Version: 07928d9bfc81640bab36f5190e8725894d93b659
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      nvd: "{\"cve\":{\"id\":\"CVE-2023-52854\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T16:15:22.377\",\"lastModified\":\"2025-02-03T16:13:08.960\",\"vulnStatus\":\"Analyzed\",\"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'll describe the problem scenario\\nusing a simplified model:\\n\\nSuppose there's 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->done);\\n}\\n\\nvoid user_function() {\\n    DECLARE_COMPLETION(done)\\n    padata->parallel = parallel;\\n    padata->serial = serial;\\n    padata_do_parallel();\\n    wait_for_completion(&done);\\n    padata_free_shell();\\n}\\n```\\n\\nIn the corresponding padata.c file, there's 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(&local_list)) {\\n        ...\\n        padata->serial(padata);\\n        cnt++;\\n    }\\n\\n    local_bh_enable();\\n\\n    if (refcount_sub_and_test(cnt, &pd->refcnt))\\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->refcnt`,\\n`pd` has already been released by `padata_free_shell()`, resulting\\nin a UAF issue with `pd->refcnt`.\\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 análisis de la llamada a la función pcrypt_aead01, describiré 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` después de `serial()`. ha sido invocado, como se demuestra en el siguiente código: ```c struct request { struct padata_priv padata; finalización 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->hecho); } void user_function() { DECLARE_COMPLETION(hecho) padata->parallel = parallel; padata->serial = serial; padata_do_parallel(); wait_for_completion(&hecho); padata_free_shell(); } ``` En el archivo padata.c correspondiente, hay el siguiente código: ```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); } ``` Debido a la alta carga del sistema y la acumulación de software no ejecutado en este momento, `local_bh_enable()` en padata tarda más de lo habitual en ejecutarse. Posteriormente, al acceder a `pd->refcnt`, `pd` ya ha sido liberado por `padata_free_shell()`, lo que genera un problema de UAF con `pd->refcnt`. La solución es sencilla: agregue `refcount_dec_and_test` antes de llamar a `padata_free_pd` en 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Due to the lengthy analysis of\\nthe pcrypt_aead01 function call, I'll describe the problem scenario\\nusing a simplified model:\\n\\nSuppose there's 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->done);\\n}\\n\\nvoid user_function() {\\n    DECLARE_COMPLETION(done)\\n    padata->parallel = parallel;\\n    padata->serial = serial;\\n    padata_do_parallel();\\n    wait_for_completion(&done);\\n    padata_free_shell();\\n}\\n```\\n\\nIn the corresponding padata.c file, there's 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(&local_list)) {\\n        ...\\n        padata->serial(padata);\\n        cnt++;\\n    }\\n\\n    local_bh_enable();\\n\\n    if (refcount_sub_and_test(cnt, &pd->refcnt))\\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->refcnt`,\\n`pd` has already been released by `padata_free_shell()`, resulting\\nin a UAF issue with `pd->refcnt`.\\n\\nThe fix is straightforward: add `refcount_dec_and_test` before calling\\n`padata_free_pd` in `padata_free_shell`.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-05-29T05:18:30.184Z\"}}}",
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         dataType: "CVE_RECORD",
         dataVersion: "5.1",
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   },
}


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