cve-2024-26616
Vulnerability from cvelistv5
Published
2024-02-29 15:52
Modified
2024-11-05 09:12
Severity ?
Summary
btrfs: scrub: avoid use-after-free when chunk length is not 64K aligned
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/34de0f04684ec00c093a0455648be055f0e8e24f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/642b9c520ef2f104277ad1f902f8526edbe087fb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f546c4282673497a06ecb6190b50ae7f6c85b02f
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

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                "id": "CVE-2024-26616",
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
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          "vendor": "Linux",
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: scrub: avoid use-after-free when chunk length is not 64K aligned\n\n[BUG]\nThere is a bug report that, on a ext4-converted btrfs, scrub leads to\nvarious problems, including:\n\n- \"unable to find chunk map\" errors\n  BTRFS info (device vdb): scrub: started on devid 1\n  BTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 4096\n  BTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 45056\n\n  This would lead to unrepariable errors.\n\n- Use-after-free KASAN reports:\n  ==================================================================\n  BUG: KASAN: slab-use-after-free in __blk_rq_map_sg+0x18f/0x7c0\n  Read of size 8 at addr ffff8881013c9040 by task btrfs/909\n  CPU: 0 PID: 909 Comm: btrfs Not tainted 6.7.0-x64v3-dbg #11 c50636e9419a8354555555245df535e380563b2b\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 2023.11-2 12/24/2023\n  Call Trace:\n   \u003cTASK\u003e\n   dump_stack_lvl+0x43/0x60\n   print_report+0xcf/0x640\n   kasan_report+0xa6/0xd0\n   __blk_rq_map_sg+0x18f/0x7c0\n   virtblk_prep_rq.isra.0+0x215/0x6a0 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff]\n   virtio_queue_rqs+0xc4/0x310 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff]\n   blk_mq_flush_plug_list.part.0+0x780/0x860\n   __blk_flush_plug+0x1ba/0x220\n   blk_finish_plug+0x3b/0x60\n   submit_initial_group_read+0x10a/0x290 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   flush_scrub_stripes+0x38e/0x430 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   scrub_stripe+0x82a/0xae0 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   scrub_chunk+0x178/0x200 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   scrub_enumerate_chunks+0x4bc/0xa30 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   btrfs_scrub_dev+0x398/0x810 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   btrfs_ioctl+0x4b9/0x3020 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   __x64_sys_ioctl+0xbd/0x100\n   do_syscall_64+0x5d/0xe0\n   entry_SYSCALL_64_after_hwframe+0x63/0x6b\n  RIP: 0033:0x7f47e5e0952b\n\n- Crash, mostly due to above use-after-free\n\n[CAUSE]\nThe converted fs has the following data chunk layout:\n\n    item 2 key (FIRST_CHUNK_TREE CHUNK_ITEM 2214658048) itemoff 16025 itemsize 80\n        length 86016 owner 2 stripe_len 65536 type DATA|single\n\nFor above logical bytenr 2214744064, it\u0027s at the chunk end\n(2214658048 + 86016 = 2214744064).\n\nThis means btrfs_submit_bio() would split the bio, and trigger endio\nfunction for both of the two halves.\n\nHowever scrub_submit_initial_read() would only expect the endio function\nto be called once, not any more.\nThis means the first endio function would already free the bbio::bio,\nleaving the bvec freed, thus the 2nd endio call would lead to\nuse-after-free.\n\n[FIX]\n- Make sure scrub_read_endio() only updates bits in its range\n  Since we may read less than 64K at the end of the chunk, we should not\n  touch the bits beyond chunk boundary.\n\n- Make sure scrub_submit_initial_read() only to read the chunk range\n  This is done by calculating the real number of sectors we need to\n  read, and add sector-by-sector to the bio.\n\nThankfully the scrub read repair path won\u0027t need extra fixes:\n\n- scrub_stripe_submit_repair_read()\n  With above fixes, we won\u0027t update error bit for range beyond chunk,\n  thus scrub_stripe_submit_repair_read() should never submit any read\n  beyond the chunk."
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      "title": "btrfs: scrub: avoid use-after-free when chunk length is not 64K aligned",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2024-26616",
    "datePublished": "2024-02-29T15:52:19.452Z",
    "dateReserved": "2024-02-19T14:20:24.131Z",
    "dateUpdated": "2024-11-05T09:12:38.853Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-26616\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-03-11T18:15:19.400\",\"lastModified\":\"2024-03-12T12:40:13.500\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbtrfs: scrub: avoid use-after-free when chunk length is not 64K aligned\\n\\n[BUG]\\nThere is a bug report that, on a ext4-converted btrfs, scrub leads to\\nvarious problems, including:\\n\\n- \\\"unable to find chunk map\\\" errors\\n  BTRFS info (device vdb): scrub: started on devid 1\\n  BTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 4096\\n  BTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 45056\\n\\n  This would lead to unrepariable errors.\\n\\n- Use-after-free KASAN reports:\\n  ==================================================================\\n  BUG: KASAN: slab-use-after-free in __blk_rq_map_sg+0x18f/0x7c0\\n  Read of size 8 at addr ffff8881013c9040 by task btrfs/909\\n  CPU: 0 PID: 909 Comm: btrfs Not tainted 6.7.0-x64v3-dbg #11 c50636e9419a8354555555245df535e380563b2b\\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 2023.11-2 12/24/2023\\n  Call Trace:\\n   \u003cTASK\u003e\\n   dump_stack_lvl+0x43/0x60\\n   print_report+0xcf/0x640\\n   kasan_report+0xa6/0xd0\\n   __blk_rq_map_sg+0x18f/0x7c0\\n   virtblk_prep_rq.isra.0+0x215/0x6a0 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff]\\n   virtio_queue_rqs+0xc4/0x310 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff]\\n   blk_mq_flush_plug_list.part.0+0x780/0x860\\n   __blk_flush_plug+0x1ba/0x220\\n   blk_finish_plug+0x3b/0x60\\n   submit_initial_group_read+0x10a/0x290 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\\n   flush_scrub_stripes+0x38e/0x430 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\\n   scrub_stripe+0x82a/0xae0 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\\n   scrub_chunk+0x178/0x200 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\\n   scrub_enumerate_chunks+0x4bc/0xa30 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\\n   btrfs_scrub_dev+0x398/0x810 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\\n   btrfs_ioctl+0x4b9/0x3020 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\\n   __x64_sys_ioctl+0xbd/0x100\\n   do_syscall_64+0x5d/0xe0\\n   entry_SYSCALL_64_after_hwframe+0x63/0x6b\\n  RIP: 0033:0x7f47e5e0952b\\n\\n- Crash, mostly due to above use-after-free\\n\\n[CAUSE]\\nThe converted fs has the following data chunk layout:\\n\\n    item 2 key (FIRST_CHUNK_TREE CHUNK_ITEM 2214658048) itemoff 16025 itemsize 80\\n        length 86016 owner 2 stripe_len 65536 type DATA|single\\n\\nFor above logical bytenr 2214744064, it\u0027s at the chunk end\\n(2214658048 + 86016 = 2214744064).\\n\\nThis means btrfs_submit_bio() would split the bio, and trigger endio\\nfunction for both of the two halves.\\n\\nHowever scrub_submit_initial_read() would only expect the endio function\\nto be called once, not any more.\\nThis means the first endio function would already free the bbio::bio,\\nleaving the bvec freed, thus the 2nd endio call would lead to\\nuse-after-free.\\n\\n[FIX]\\n- Make sure scrub_read_endio() only updates bits in its range\\n  Since we may read less than 64K at the end of the chunk, we should not\\n  touch the bits beyond chunk boundary.\\n\\n- Make sure scrub_submit_initial_read() only to read the chunk range\\n  This is done by calculating the real number of sectors we need to\\n  read, and add sector-by-sector to the bio.\\n\\nThankfully the scrub read repair path won\u0027t need extra fixes:\\n\\n- scrub_stripe_submit_repair_read()\\n  With above fixes, we won\u0027t update error bit for range beyond chunk,\\n  thus scrub_stripe_submit_repair_read() should never submit any read\\n  beyond the chunk.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: btrfs: limpieza: evita el use-after-free cuando la longitud del fragmento no est\u00e1 alineada con 64 K [ERROR] Hay un informe de error que indica que, en un btrfs convertido a ext4, la limpieza conduce a varios problemas, que incluyen: - Errores \\\"no se puede encontrar el mapa de fragmentos\\\" Informaci\u00f3n BTRFS (dispositivo vdb): limpieza: iniciado en el devid 1 BTRFS cr\u00edtico (dispositivo vdb): no se puede encontrar el mapa de fragmentos para la longitud l\u00f3gica 2214744064 4096 BTRFS cr\u00edtico (dispositivo vdb): No se puede encontrar el mapa de fragmentos para la longitud l\u00f3gica 2214744064 45056. Esto provocar\u00eda errores irreparables. - Informes KASAN de uso gratuito: =========================================== ========================= ERROR: KASAN: slab-use-after-free en __blk_rq_map_sg+0x18f/0x7c0 Lectura de tama\u00f1o 8 en la direcci\u00f3n ffff8881013c9040 por tarea btrfs/909 CPU: 0 PID: 909 Comm: btrfs Not tainted 6.7.0-x64v3-dbg #11 c50636e9419a8354555555245df535e380563b2b Nombre de hardware: PC est\u00e1ndar QEMU (Q35 + ICH9, 2009), BIOS 2023.11-2 24/12/2023 Seguimiento de llamadas :  dump_stack_lvl+0x43/0x60 print_report+0xcf/0x640 kasan_report+0xa6/0xd0 __blk_rq_map_sg+0x18f/0x7c0 virtblk_prep_rq.isra.0+0x215/0x6a0 [virtio_blk 19a65eeee9ae6fcf02ed fad39bb9ddee07dcdaff] virtio_queue_rqs+0xc4/0x310 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff] blk_mq_flush_plug_list.part. 0+0x780/0x860 __blk_flush_plug+0x1ba/0x220 blk_finish_plug+0x3b/0x60 submit_initial_group_read+0x10a/0x290 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] Flush_scrub_stripes+0x38 e/0x430 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] Scrub_stripe+0x82a/0xae0 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] Scrub_chunk+0x178/0x200 [btrfs e579 87a360cama82fe8756dcd3e0de5406ccfe965 ] Scrub_enumerate_chunks+0x4bc/0xa30 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] btrfs_scrub_dev+0x398/0x810 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] btr fs_ioctl+0x4b9/0x3020 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] __x64_sys_ioctl+0xbd/0x100 do_syscall_64+0x5d/0xe0 Entry_SYSCALL_64_after_hwframe+0x63/0x6b QEPD: 0033:0x7f47e5e0952b - Fallo , principalmente debido al use-after-free anterior [CAUSA] El fs convertido tiene el siguiente dise\u00f1o de fragmento de datos: clave del elemento 2 (FIRST_CHUNK_TREE CHUNK_ITEM 2214658048) itemoff 16025 tama\u00f1o del elemento 80 longitud 86016 propietario 2 stripe_len 65536 tipo DATOS|single Para el bytenr l\u00f3gico anterior 2214744064 , est\u00e1 al final del fragmento (2214658048 + 86016 = 2214744064). Esto significa que btrfs_submit_bio() dividir\u00eda la biograf\u00eda y activar\u00eda la funci\u00f3n endio para ambas mitades. Sin embargo, Scrub_submit_initial_read() solo esperar\u00eda que la funci\u00f3n endio se llamara una vez, ya no. Esto significa que la primera funci\u00f3n endio ya liberar\u00eda bbio::bio, dejando libre el bvec, por lo que la segunda llamada a endio conducir\u00eda a use-after-free. [FIX] - Aseg\u00farese de que Scrub_read_endio() solo actualice los bits en su rango. Dado que podemos leer menos de 64 K al final del fragmento, no debemos tocar los bits m\u00e1s all\u00e1 del l\u00edmite del fragmento. - Aseg\u00farese de que Scrub_submit_initial_read() solo lea el rango de fragmentos. Esto se hace calculando el n\u00famero real de sectores que necesitamos leer y agregando sector por sector a la biograf\u00eda. Afortunadamente, la ruta de reparaci\u00f3n de lectura de limpieza no necesitar\u00e1 correcciones adicionales: - Scrub_stripe_submit_repair_read() Con las correcciones anteriores, no actualizaremos el bit de error para el rango m\u00e1s all\u00e1 del fragmento, por lo tanto, Scrub_stripe_submit_repair_read() nunca deber\u00eda enviar ninguna lectura m\u00e1s all\u00e1 del fragmento.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/34de0f04684ec00c093a0455648be055f0e8e24f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/642b9c520ef2f104277ad1f902f8526edbe087fb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f546c4282673497a06ecb6190b50ae7f6c85b02f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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