cve-2021-47493
Vulnerability from cvelistv5
Published
2024-05-22 08:19
Modified
2024-08-04 05:39
Severity
Summary
ocfs2: fix race between searching chunks and release journal_head from buffer_head
References
SourceURLTags
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2e382600e8856ea654677b5134ee66e03ea72bc2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5043fbd294f5909a080ade0f04b70a4da9e122b7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6f1b228529ae49b0f85ab89bcdb6c365df401558
Impacted products
VendorProduct
LinuxLinux
LinuxLinux
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix race between searching chunks and release journal_head from buffer_head\n\nEncountered a race between ocfs2_test_bg_bit_allocatable() and\njbd2_journal_put_journal_head() resulting in the below vmcore.\n\n  PID: 106879  TASK: ffff880244ba9c00  CPU: 2   COMMAND: \"loop3\"\n  Call trace:\n    panic\n    oops_end\n    no_context\n    __bad_area_nosemaphore\n    bad_area_nosemaphore\n    __do_page_fault\n    do_page_fault\n    page_fault\n      [exception RIP: ocfs2_block_group_find_clear_bits+316]\n    ocfs2_block_group_find_clear_bits [ocfs2]\n    ocfs2_cluster_group_search [ocfs2]\n    ocfs2_search_chain [ocfs2]\n    ocfs2_claim_suballoc_bits [ocfs2]\n    __ocfs2_claim_clusters [ocfs2]\n    ocfs2_claim_clusters [ocfs2]\n    ocfs2_local_alloc_slide_window [ocfs2]\n    ocfs2_reserve_local_alloc_bits [ocfs2]\n    ocfs2_reserve_clusters_with_limit [ocfs2]\n    ocfs2_reserve_clusters [ocfs2]\n    ocfs2_lock_refcount_allocators [ocfs2]\n    ocfs2_make_clusters_writable [ocfs2]\n    ocfs2_replace_cow [ocfs2]\n    ocfs2_refcount_cow [ocfs2]\n    ocfs2_file_write_iter [ocfs2]\n    lo_rw_aio\n    loop_queue_work\n    kthread_worker_fn\n    kthread\n    ret_from_fork\n\nWhen ocfs2_test_bg_bit_allocatable() called bh2jh(bg_bh), the\nbg_bh-\u003eb_private NULL as jbd2_journal_put_journal_head() raced and\nreleased the jounal head from the buffer head.  Needed to take bit lock\nfor the bit \u0027BH_JournalHead\u0027 to fix this race."
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        "dateUpdated": "2024-05-29T05:08:55.227Z",
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47493",
    "datePublished": "2024-05-22T08:19:41.419Z",
    "dateReserved": "2024-05-22T06:20:56.201Z",
    "dateUpdated": "2024-08-04T05:39:59.750Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47493\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-22T09:15:11.100\",\"lastModified\":\"2024-05-22T12:46:53.887\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nocfs2: fix race between searching chunks and release journal_head from buffer_head\\n\\nEncountered a race between ocfs2_test_bg_bit_allocatable() and\\njbd2_journal_put_journal_head() resulting in the below vmcore.\\n\\n  PID: 106879  TASK: ffff880244ba9c00  CPU: 2   COMMAND: \\\"loop3\\\"\\n  Call trace:\\n    panic\\n    oops_end\\n    no_context\\n    __bad_area_nosemaphore\\n    bad_area_nosemaphore\\n    __do_page_fault\\n    do_page_fault\\n    page_fault\\n      [exception RIP: ocfs2_block_group_find_clear_bits+316]\\n    ocfs2_block_group_find_clear_bits [ocfs2]\\n    ocfs2_cluster_group_search [ocfs2]\\n    ocfs2_search_chain [ocfs2]\\n    ocfs2_claim_suballoc_bits [ocfs2]\\n    __ocfs2_claim_clusters [ocfs2]\\n    ocfs2_claim_clusters [ocfs2]\\n    ocfs2_local_alloc_slide_window [ocfs2]\\n    ocfs2_reserve_local_alloc_bits [ocfs2]\\n    ocfs2_reserve_clusters_with_limit [ocfs2]\\n    ocfs2_reserve_clusters [ocfs2]\\n    ocfs2_lock_refcount_allocators [ocfs2]\\n    ocfs2_make_clusters_writable [ocfs2]\\n    ocfs2_replace_cow [ocfs2]\\n    ocfs2_refcount_cow [ocfs2]\\n    ocfs2_file_write_iter [ocfs2]\\n    lo_rw_aio\\n    loop_queue_work\\n    kthread_worker_fn\\n    kthread\\n    ret_from_fork\\n\\nWhen ocfs2_test_bg_bit_allocatable() called bh2jh(bg_bh), the\\nbg_bh-\u003eb_private NULL as jbd2_journal_put_journal_head() raced and\\nreleased the jounal head from the buffer head.  Needed to take bit lock\\nfor the bit \u0027BH_JournalHead\u0027 to fix this race.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: ocfs2: corrige la ejecuci\u00f3n entre fragmentos de b\u00fasqueda y libera journal_head de buffer_head Se encontr\u00f3 una ejecuci\u00f3n entre ocfs2_test_bg_bit_allocatable() y jbd2_journal_put_journal_head() que result\u00f3 en el siguiente vmcore. PID: 106879 TAREA: ffff880244ba9c00 CPU: 2 COMANDO: \\\"loop3\\\" Rastreo de llamadas: p\u00e1nico oops_end no_context __bad_area_nosemaphore bad_area_nosemaphore __do_page_fault do_page_fault page_fault [excepci\u00f3n RIP: ocfs2_block_group_find_clear_bits+316] 2_block_group_find_clear_bits [ocfs2] ocfs2_cluster_group_search [ocfs2] ocfs2_search_chain [ocfs2] ocfs2_claim_suballoc_bits [ocfs2] __ocfs2_claim_clusters [ocfs2] ocfs2_claim_clusters [ocfs2] ocfs2_local_alloc_slide_window [ocfs2] ocfs2_reserve_local_alloc_bits [ocfs2] ocfs2_reserve_clusters_with_limit [ocfs2] ocfs2_reserve_clusters [ocfs2] ocfs2_lock_refcount_allocators [ocfs2] 2_make_clusters_writable [ocfs2] ocfs2_replace_cow [ocfs2] ocfs2_refcount_cow [ocfs2] ocfs2_file_write_iter [ocfs2] lo_rw_aio loop_queue_work kthread_worker_fn kthread ret_from_fork Cuando ocfs2_test_bg_bit_allocatable () llamado bh2jh(bg_bh), el bg_bh-\u0026gt;b_private NULL como jbd2_journal_put_journal_head() corri\u00f3 y liber\u00f3 el encabezado del diario del encabezado del b\u00fafer. Era necesario bloquear el bit \u0027BH_JournalHead\u0027 para solucionar esta ejecuci\u00f3n.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2e382600e8856ea654677b5134ee66e03ea72bc2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5043fbd294f5909a080ade0f04b70a4da9e122b7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6f1b228529ae49b0f85ab89bcdb6c365df401558\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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