CVE-2021-47288 (GCVE-0-2021-47288)
Vulnerability from cvelistv5
Published
2024-05-21 14:34
Modified
2025-05-04 07:07
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: media: ngene: Fix out-of-bounds bug in ngene_command_config_free_buf() Fix an 11-year old bug in ngene_command_config_free_buf() while addressing the following warnings caught with -Warray-bounds: arch/alpha/include/asm/string.h:22:16: warning: '__builtin_memcpy' offset [12, 16] from the object at 'com' is out of the bounds of referenced subobject 'config' with type 'unsigned char' at offset 10 [-Warray-bounds] arch/x86/include/asm/string_32.h:182:25: warning: '__builtin_memcpy' offset [12, 16] from the object at 'com' is out of the bounds of referenced subobject 'config' with type 'unsigned char' at offset 10 [-Warray-bounds] The problem is that the original code is trying to copy 6 bytes of data into a one-byte size member _config_ of the wrong structue FW_CONFIGURE_BUFFERS, in a single call to memcpy(). This causes a legitimate compiler warning because memcpy() overruns the length of &com.cmd.ConfigureBuffers.config. It seems that the right structure is FW_CONFIGURE_FREE_BUFFERS, instead, because it contains 6 more members apart from the header _hdr_. Also, the name of the function ngene_command_config_free_buf() suggests that the actual intention is to ConfigureFreeBuffers, instead of ConfigureBuffers (which takes place in the function ngene_command_config_buf(), above). Fix this by enclosing those 6 members of struct FW_CONFIGURE_FREE_BUFFERS into new struct config, and use &com.cmd.ConfigureFreeBuffers.config as the destination address, instead of &com.cmd.ConfigureBuffers.config, when calling memcpy(). This also helps with the ongoing efforts to globally enable -Warray-bounds and get us closer to being able to tighten the FORTIFY_SOURCE routines on memcpy().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/4487b968e5eacd02c493303dc2b61150bb7fe4b2 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/8d4abca95ecc82fc8c41912fa0085281f19cc29f Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/b9a178f189bb6d75293573e181928735f5e3e070 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/c6ddeb63dd543b5474b0217c4e47538b7ffd7686 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/e617fa62f6cf859a7b042cdd6c73af905ff8fca3 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/e818f2ff648581a6c553ae2bebc5dcef9a8bb90c Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/e991457afdcb5f4dbc5bc9d79eaf775be33e7092 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/ec731c6ef564ee6fc101fc5d73e3a3a953d09a00 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/4487b968e5eacd02c493303dc2b61150bb7fe4b2 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/8d4abca95ecc82fc8c41912fa0085281f19cc29f Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/b9a178f189bb6d75293573e181928735f5e3e070 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/c6ddeb63dd543b5474b0217c4e47538b7ffd7686 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/e617fa62f6cf859a7b042cdd6c73af905ff8fca3 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/e818f2ff648581a6c553ae2bebc5dcef9a8bb90c Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/e991457afdcb5f4dbc5bc9d79eaf775be33e7092 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/ec731c6ef564ee6fc101fc5d73e3a3a953d09a00 Patch
Impacted products
Vendor Product Version
Linux Linux Version: dae52d009fc950b5c209260d50fcc000f5becd3c
Version: dae52d009fc950b5c209260d50fcc000f5becd3c
Version: dae52d009fc950b5c209260d50fcc000f5becd3c
Version: dae52d009fc950b5c209260d50fcc000f5becd3c
Version: dae52d009fc950b5c209260d50fcc000f5becd3c
Version: dae52d009fc950b5c209260d50fcc000f5becd3c
Version: dae52d009fc950b5c209260d50fcc000f5becd3c
Version: dae52d009fc950b5c209260d50fcc000f5becd3c
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    "datePublished": "2024-05-21T14:34:51.776Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47288\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T15:15:16.867\",\"lastModified\":\"2024-12-23T16:45:23.720\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmedia: ngene: Fix out-of-bounds bug in ngene_command_config_free_buf()\\n\\nFix an 11-year old bug in ngene_command_config_free_buf() while\\naddressing the following warnings caught with -Warray-bounds:\\n\\narch/alpha/include/asm/string.h:22:16: warning: \u0027__builtin_memcpy\u0027 offset [12, 16] from the object at \u0027com\u0027 is out of the bounds of referenced subobject \u0027config\u0027 with type \u0027unsigned char\u0027 at offset 10 [-Warray-bounds]\\narch/x86/include/asm/string_32.h:182:25: warning: \u0027__builtin_memcpy\u0027 offset [12, 16] from the object at \u0027com\u0027 is out of the bounds of referenced subobject \u0027config\u0027 with type \u0027unsigned char\u0027 at offset 10 [-Warray-bounds]\\n\\nThe problem is that the original code is trying to copy 6 bytes of\\ndata into a one-byte size member _config_ of the wrong structue\\nFW_CONFIGURE_BUFFERS, in a single call to memcpy(). This causes a\\nlegitimate compiler warning because memcpy() overruns the length\\nof \u0026com.cmd.ConfigureBuffers.config. It seems that the right\\nstructure is FW_CONFIGURE_FREE_BUFFERS, instead, because it contains\\n6 more members apart from the header _hdr_. Also, the name of\\nthe function ngene_command_config_free_buf() suggests that the actual\\nintention is to ConfigureFreeBuffers, instead of ConfigureBuffers\\n(which takes place in the function ngene_command_config_buf(), above).\\n\\nFix this by enclosing those 6 members of struct FW_CONFIGURE_FREE_BUFFERS\\ninto new struct config, and use \u0026com.cmd.ConfigureFreeBuffers.config as\\nthe destination address, instead of \u0026com.cmd.ConfigureBuffers.config,\\nwhen calling memcpy().\\n\\nThis also helps with the ongoing efforts to globally enable\\n-Warray-bounds and get us closer to being able to tighten the\\nFORTIFY_SOURCE routines on memcpy().\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: medios: ngene: corrige un error fuera de los l\u00edmites en ngene_command_config_free_buf(). Corrige un error de hace 11 a\u00f1os en ngene_command_config_free_buf() mientras se solucionan las siguientes advertencias detectadas con -Warray-bounds: arch/alpha/include/asm/string.h:22:16: advertencia: el desplazamiento \u0027__builtin_memcpy\u0027 [12, 16] del objeto en \u0027com\u0027 est\u00e1 fuera de los l\u00edmites del subobjeto referenciado \u0027config\u0027 con tipo \u0027car\u00e1cter sin firmar \u0027 en el desplazamiento 10 [-Warray-bounds] arch/x86/include/asm/string_32.h:182:25: advertencia: el desplazamiento \u0027__builtin_memcpy\u0027 [12, 16] del objeto en \u0027com\u0027 est\u00e1 fuera de los l\u00edmites de subobjeto referenciado \u0027config\u0027 con tipo \u0027unsigned char\u0027 en el desplazamiento 10 [-Warray-bounds] El problema es que el c\u00f3digo original est\u00e1 intentando copiar 6 bytes de datos en un miembro de tama\u00f1o de un byte _config_ de la estructura incorrecta FW_CONFIGURE_BUFFERS, en una sola llamada a memcpy(). Esto provoca una advertencia leg\u00edtima del compilador porque memcpy() sobrepasa la longitud de \u0026amp;com.cmd.ConfigureBuffers.config. Parece que la estructura correcta es FW_CONFIGURE_FREE_BUFFERS, porque contiene 6 miembros m\u00e1s adem\u00e1s del encabezado _hdr_. Adem\u00e1s, el nombre de la funci\u00f3n ngene_command_config_free_buf() sugiere que la intenci\u00f3n real es ConfigureFreeBuffers, en lugar de ConfigureBuffers (que tiene lugar en la funci\u00f3n ngene_command_config_buf(), arriba). Solucione este problema encerrando esos 6 miembros de la estructura FW_CONFIGURE_FREE_BUFFERS en una nueva configuraci\u00f3n de estructura y use \u0026amp;com.cmd.ConfigureFreeBuffers.config como direcci\u00f3n de destino, en lugar de \u0026amp;com.cmd.ConfigureBuffers.config, al llamar a memcpy(). Esto tambi\u00e9n ayuda con los esfuerzos continuos para habilitar globalmente -Warray-bounds y acercarnos a poder ajustar las rutinas FORTIFY_SOURCE en 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from the object at \u0027com\u0027 is out of the bounds of referenced subobject \u0027config\u0027 with type \u0027unsigned char\u0027 at offset 10 [-Warray-bounds]\\n\\nThe problem is that the original code is trying to copy 6 bytes of\\ndata into a one-byte size member _config_ of the wrong structue\\nFW_CONFIGURE_BUFFERS, in a single call to memcpy(). This causes a\\nlegitimate compiler warning because memcpy() overruns the length\\nof \u0026com.cmd.ConfigureBuffers.config. It seems that the right\\nstructure is FW_CONFIGURE_FREE_BUFFERS, instead, because it contains\\n6 more members apart from the header _hdr_. Also, the name of\\nthe function ngene_command_config_free_buf() suggests that the actual\\nintention is to ConfigureFreeBuffers, instead of ConfigureBuffers\\n(which takes place in the function ngene_command_config_buf(), above).\\n\\nFix this by enclosing those 6 members of struct FW_CONFIGURE_FREE_BUFFERS\\ninto new struct config, and use \u0026com.cmd.ConfigureFreeBuffers.config as\\nthe destination address, instead of \u0026com.cmd.ConfigureBuffers.config,\\nwhen calling memcpy().\\n\\nThis also helps with the ongoing efforts to globally enable\\n-Warray-bounds and get us closer to being able to tighten the\\nFORTIFY_SOURCE routines on memcpy().\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-05-29T05:05:20.262Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47288\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-08-04T05:32:08.191Z\", \"dateReserved\": \"2024-05-21T13:27:52.129Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T14:34:51.776Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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