mirror of
https://github.com/fkie-cad/nvd-json-data-feeds.git
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49 lines
6.4 KiB
JSON
49 lines
6.4 KiB
JSON
{
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"id": "CVE-2024-57929",
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"published": "2025-01-19T12:15:27.013",
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"lastModified": "2025-02-02T11:15:14.227",
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"vulnStatus": "Awaiting Analysis",
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"cveTags": [],
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm array: fix releasing a faulty array block twice in dm_array_cursor_end\n\nWhen dm_bm_read_lock() fails due to locking or checksum errors, it\nreleases the faulty block implicitly while leaving an invalid output\npointer behind. The caller of dm_bm_read_lock() should not operate on\nthis invalid dm_block pointer, or it will lead to undefined result.\nFor example, the dm_array_cursor incorrectly caches the invalid pointer\non reading a faulty array block, causing a double release in\ndm_array_cursor_end(), then hitting the BUG_ON in dm-bufio cache_put().\n\nReproduce steps:\n\n1. initialize a cache device\n\ndmsetup create cmeta --table \"0 8192 linear /dev/sdc 0\"\ndmsetup create cdata --table \"0 65536 linear /dev/sdc 8192\"\ndmsetup create corig --table \"0 524288 linear /dev/sdc $262144\"\ndd if=/dev/zero of=/dev/mapper/cmeta bs=4k count=1\ndmsetup create cache --table \"0 524288 cache /dev/mapper/cmeta \\\n/dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0\"\n\n2. wipe the second array block offline\n\ndmsteup remove cache cmeta cdata corig\nmapping_root=$(dd if=/dev/sdc bs=1c count=8 skip=192 \\\n2>/dev/null | hexdump -e '1/8 \"%u\\n\"')\nablock=$(dd if=/dev/sdc bs=1c count=8 skip=$((4096*mapping_root+2056)) \\\n2>/dev/null | hexdump -e '1/8 \"%u\\n\"')\ndd if=/dev/zero of=/dev/sdc bs=4k count=1 seek=$ablock\n\n3. try reopen the cache device\n\ndmsetup create cmeta --table \"0 8192 linear /dev/sdc 0\"\ndmsetup create cdata --table \"0 65536 linear /dev/sdc 8192\"\ndmsetup create corig --table \"0 524288 linear /dev/sdc $262144\"\ndmsetup create cache --table \"0 524288 cache /dev/mapper/cmeta \\\n/dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0\"\n\nKernel logs:\n\n(snip)\ndevice-mapper: array: array_block_check failed: blocknr 0 != wanted 10\ndevice-mapper: block manager: array validator check failed for block 10\ndevice-mapper: array: get_ablock failed\ndevice-mapper: cache metadata: dm_array_cursor_next for mapping failed\n------------[ cut here ]------------\nkernel BUG at drivers/md/dm-bufio.c:638!\n\nFix by setting the cached block pointer to NULL on errors.\n\nIn addition to the reproducer described above, this fix can be\nverified using the \"array_cursor/damaged\" test in dm-unit:\n dm-unit run /pdata/array_cursor/damaged --kernel-dir <KERNEL_DIR>"
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},
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{
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"lang": "es",
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: dm array: se corrige la liberaci\u00f3n de un bloque de matriz defectuoso dos veces en dm_array_cursor_end Cuando dm_bm_read_lock() falla debido a errores de bloqueo o suma de comprobaci\u00f3n, libera el bloque defectuoso impl\u00edcitamente mientras deja atr\u00e1s un puntero de salida no v\u00e1lido. El llamador de dm_bm_read_lock() no debe operar en este puntero dm_block no v\u00e1lido, o conducir\u00e1 a un resultado indefinido. Por ejemplo, dm_array_cursor almacena en cach\u00e9 incorrectamente el puntero no v\u00e1lido al leer un bloque de matriz defectuoso, lo que causa una doble liberaci\u00f3n en dm_array_cursor_end(), y luego alcanza el BUG_ON en dm-bufio cache_put(). Reproducir los pasos: 1. inicializar un dispositivo de cach\u00e9 dmsetup create cmeta --table \"0 8192 linear /dev/sdc 0\" dmsetup create cdata --table \"0 65536 linear /dev/sdc 8192\" dmsetup create corig --table \"0 524288 linear /dev/sdc $262144\" dd if=/dev/zero of=/dev/mapper/cmeta bs=4k count=1 dmsetup create cache --table \"0 524288 cache /dev/mapper/cmeta \\ /dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0\" 2. borrar el segundo bloque de matriz sin conexi\u00f3n dmsteup remove cache cmeta cdata corig mapping_root=$(dd if=/dev/sdc bs=1c count=8 skip=192 \\ 2>/dev/null | hexdump -e '1/8 \"%u\\n\"') ablock=$(dd if=/dev/sdc bs=1c count=8 skip=$((4096*mapping_root+2056)) \\ 2>/dev/null | hexdump -e '1/8 \"%u\\n\"') dd if=/dev/zero of=/dev/sdc bs=4k count=1 seek=$ablock 3. Intente volver a abrir el dispositivo de cach\u00e9 dmsetup create cmeta --table \"0 8192 lineal /dev/sdc 0\" dmsetup create cdata --table \"0 65536 lineal /dev/sdc 8192\" dmsetup create corig --table \"0 524288 lineal /dev/sdc $262144\" dmsetup create cache --table \"0 524288 cach\u00e9 /dev/mapper/cmeta \\ /dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0\" Registros del kernel: (snip) device-mapper: array: array_block_check failed: blocknr 0 != wanted 10 device-mapper: block manager: array validator check failed for block 10 device-mapper: array: get_ablock failed device-mapper: cache metadata: dm_array_cursor_next for mapping failed ------------[ corte aqu\u00ed ]------------ \u00a1ERROR del kernel en drivers/md/dm-bufio.c:638! Se corrige configurando el puntero de bloque en cach\u00e9 en NULL en caso de errores. Adem\u00e1s del reproductor descrito anteriormente, esta correcci\u00f3n se puede verificar utilizando la prueba \"array_cursor/damaged\" en dm-unit: dm-unit run /pdata/array_cursor/damaged --kernel-dir "
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}
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],
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"metrics": {},
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/017c4470bff53585370028fec9341247bad358ff",
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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},
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{
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"url": "https://git.kernel.org/stable/c/6002bec5354f86d1a2df21468f68e3ec03ede9da",
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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},
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{
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"url": "https://git.kernel.org/stable/c/738994872d77e189b2d13c501a1d145e95d98f46",
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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},
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{
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"url": "https://git.kernel.org/stable/c/9c7c03d0e926762adf3a3a0ba86156fb5e19538b",
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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},
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{
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"url": "https://git.kernel.org/stable/c/e477021d252c007f0c6d45b5d13d341efed03979",
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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},
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{
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"url": "https://git.kernel.org/stable/c/f2893c0804d86230ffb8f1c8703fdbb18648abc8",
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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},
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{
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"url": "https://git.kernel.org/stable/c/fc1ef07c3522e257e32702954f265debbcb096a7",
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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}
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]
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} |