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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix general protection fault in nilfs_btree_insert()\n\nIf nilfs2 reads a corrupted disk image and tries to reads a b-tree node\nblock by calling __nilfs_btree_get_block() against an invalid virtual\nblock address, it returns -ENOENT because conversion of the virtual block\naddress to a disk block address fails.  However, this return value is the\nsame as the internal code that b-tree lookup routines return to indicate\nthat the block being searched does not exist, so functions that operate on\nthat b-tree may misbehave.\n\nWhen nilfs_btree_insert() receives this spurious \u0027not found\u0027 code from\nnilfs_btree_do_lookup(), it misunderstands that the \u0027not found\u0027 check was\nsuccessful and continues the insert operation using incomplete lookup path\ndata, causing the following crash:\n\n general protection fault, probably for non-canonical address\n 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN\n KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]\n ...\n RIP: 0010:nilfs_btree_get_nonroot_node fs/nilfs2/btree.c:418 [inline]\n RIP: 0010:nilfs_btree_prepare_insert fs/nilfs2/btree.c:1077 [inline]\n RIP: 0010:nilfs_btree_insert+0x6d3/0x1c10 fs/nilfs2/btree.c:1238\n Code: bc 24 80 00 00 00 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89\n ff e8 4b 02 92 fe 4d 8b 3f 49 83 c7 28 4c 89 f8 48 c1 e8 03 \u003c42\u003e 80 3c\n 28 00 74 08 4c 89 ff e8 2e 02 92 fe 4d 8b 3f 49 83 c7 02\n ...\n Call Trace:\n \u003cTASK\u003e\n  nilfs_bmap_do_insert fs/nilfs2/bmap.c:121 [inline]\n  nilfs_bmap_insert+0x20d/0x360 fs/nilfs2/bmap.c:147\n  nilfs_get_block+0x414/0x8d0 fs/nilfs2/inode.c:101\n  __block_write_begin_int+0x54c/0x1a80 fs/buffer.c:1991\n  __block_write_begin fs/buffer.c:2041 [inline]\n  block_write_begin+0x93/0x1e0 fs/buffer.c:2102\n  nilfs_write_begin+0x9c/0x110 fs/nilfs2/inode.c:261\n  generic_perform_write+0x2e4/0x5e0 mm/filemap.c:3772\n  __generic_file_write_iter+0x176/0x400 mm/filemap.c:3900\n  generic_file_write_iter+0xab/0x310 mm/filemap.c:3932\n  call_write_iter include/linux/fs.h:2186 [inline]\n  new_sync_write fs/read_write.c:491 [inline]\n  vfs_write+0x7dc/0xc50 fs/read_write.c:584\n  ksys_write+0x177/0x2a0 fs/read_write.c:637\n  do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n  do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80\n  entry_SYSCALL_64_after_hwframe+0x63/0xcd\n ...\n \u003c/TASK\u003e\n\nThis patch fixes the root cause of this problem by replacing the error\ncode that __nilfs_btree_get_block() returns on block address conversion\nfailure from -ENOENT to another internal code -EINVAL which means that the\nb-tree metadata is corrupted.\n\nBy returning -EINVAL, it propagates without glitches, and for all relevant\nb-tree operations, functions in the upper bmap layer output an error\nmessage indicating corrupted b-tree metadata via\nnilfs_bmap_convert_error(), and code -EIO will be eventually returned as\nit should be."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nilfs2: soluciona el fallo de protecci\u00f3n general en nilfs_btree_insert() Si nilfs2 lee una imagen de disco corrupta e intenta leer un bloque de nodo de \u00e1rbol b llamando a __nilfs_btree_get_block() contra una direcci\u00f3n de bloque virtual no v\u00e1lida, devuelve -ENOENT porque falla la conversi\u00f3n de la direcci\u00f3n del bloque virtual a una direcci\u00f3n de bloque de disco. Sin embargo, este valor de retorno es el mismo que el c\u00f3digo interno que devuelven las rutinas de b\u00fasqueda del \u00e1rbol b para indicar que el bloque que se busca no existe, por lo que las funciones que operan en ese \u00e1rbol b pueden comportarse mal. Cuando nilfs_btree_insert() recibe este c\u00f3digo falso \u0027no encontrado\u0027 de nilfs_btree_do_lookup(), malinterpreta que la verificaci\u00f3n \u0027no encontrado\u0027 fue exitosa y contin\u00faa la operaci\u00f3n de inserci\u00f3n utilizando datos de ruta de b\u00fasqueda incompletos, lo que provoca el siguiente bloqueo: falla de protecci\u00f3n general, probablemente por direcci\u00f3n no can\u00f3nica 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref en el rango [0x0000000000000028-0x000000000000002f] ... RIP: 0010:nilfs_btree_get_nonroot_node fs/nilfs 2/btree.c:418 [en l\u00ednea] RIP: 0010:nilfs_btree_prepare_insert fs/nilfs2/btree.c:1077 [en l\u00ednea] RIP: 0010:nilfs_btree_insert+0x6d3/0x1c10 fs/nilfs2/btree.c:1238 C\u00f3digo: bc 24 80 00 00 00 4c 89 f8 48 c1 e8 3 42 80 3c 28 00 74 08 4c 89 ff e8 4b 02 92 fe 4d 8b 3f 49 83 c7 28 4c 89 f8 48 c1 e8 03 \u0026lt;42\u0026gt; 80 3c 28 00 74 08 4c 89 ff e8 2e 02 92 fe 4d 8b f 49 83 c7 02... Seguimiento de llamadas:  nilfs_bmap_do_insert fs/nilfs2/bmap.c:121 [en l\u00ednea] nilfs_bmap_insert+0x20d/0x360 fs/nilfs2/bmap.c:147 nilfs_get_block+0x414/0x8d0 fs/nilfs2/inode.c: 101 __block_write_begin_int+0x54c/0x1a80 fs/buffer.c:1991 __block_write_begin fs/buffer.c:2041 [en l\u00ednea] block_write_begin+0x93/0x1e0 fs/buffer.c:2102 nilfs_write_begin+0x9c/0x110 fs/nilfs2/inode.c :261 generic_perform_write+0x2e4/0x5e0 mm/filemap.c:3772 __generic_file_write_iter+0x176/0x400 mm/filemap.c:3900 generic_file_write_iter+0xab/0x310 mm/filemap.c:3932 call_write_iter include/linux/fs.h:2186 [en l\u00ednea] new_sync_write fs/read_write.c:491 [en l\u00ednea] vfs_write+0x7dc/0xc50 fs/read_write.c:584 ksys_write+0x177/0x2a0 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [en l\u00ednea] do_syscall_64 +0x3d/0xb0 arch/x86/entry/common.c:80 Entry_SYSCALL_64_after_hwframe+0x63/0xcd ...  Este parche soluciona la causa ra\u00edz de este problema reemplazando el c\u00f3digo de error que devuelve __nilfs_btree_get_block() en la conversi\u00f3n de direcciones de bloque falla de -ENOENT a otro c\u00f3digo interno -EINVAL, lo que significa que los metadatos del \u00e1rbol b est\u00e1n da\u00f1ados. Al devolver -EINVAL, se propaga sin fallos y, para todas las operaciones relevantes del \u00e1rbol b, las funciones en la capa superior del mapa b generan un mensaje de error que indica metadatos del \u00e1rbol b corruptos a trav\u00e9s de nilfs_bmap_convert_error(), y el c\u00f3digo -EIO se devolver\u00e1 eventualmente cuando deber\u00eda ser."
    }
  ],
  "id": "CVE-2023-52900",
  "lastModified": "2024-09-13T13:40:28.597",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2024-08-21T07:15:06.297",
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  "vulnStatus": "Analyzed",
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          "value": "NVD-CWE-noinfo"
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}