cve-2022-48734
Vulnerability from cvelistv5
Published
2024-06-20 11:13
Modified
2024-08-03 15:24
Severity ?
EPSS score ?
Summary
btrfs: fix deadlock between quota disable and qgroup rescan worker
References
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"id": "CVE-2022-48734",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix deadlock between quota disable and qgroup rescan worker\n\nQuota disable ioctl starts a transaction before waiting for the qgroup\nrescan worker completes. However, this wait can be infinite and results\nin deadlock because of circular dependency among the quota disable\nioctl, the qgroup rescan worker and the other task with transaction such\nas block group relocation task.\n\nThe deadlock happens with the steps following:\n\n1) Task A calls ioctl to disable quota. It starts a transaction and\n waits for qgroup rescan worker completes.\n2) Task B such as block group relocation task starts a transaction and\n joins to the transaction that task A started. Then task B commits to\n the transaction. In this commit, task B waits for a commit by task A.\n3) Task C as the qgroup rescan worker starts its job and starts a\n transaction. In this transaction start, task C waits for completion\n of the transaction that task A started and task B committed.\n\nThis deadlock was found with fstests test case btrfs/115 and a zoned\nnull_blk device. The test case enables and disables quota, and the\nblock group reclaim was triggered during the quota disable by chance.\nThe deadlock was also observed by running quota enable and disable in\nparallel with \u0027btrfs balance\u0027 command on regular null_blk devices.\n\nAn example report of the deadlock:\n\n [372.469894] INFO: task kworker/u16:6:103 blocked for more than 122 seconds.\n [372.479944] Not tainted 5.16.0-rc8 #7\n [372.485067] \"echo 0 \u003e /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\n [372.493898] task:kworker/u16:6 state:D stack: 0 pid: 103 ppid: 2 flags:0x00004000\n [372.503285] Workqueue: btrfs-qgroup-rescan btrfs_work_helper [btrfs]\n [372.510782] Call Trace:\n [372.514092] \u003cTASK\u003e\n [372.521684] __schedule+0xb56/0x4850\n [372.530104] ? io_schedule_timeout+0x190/0x190\n [372.538842] ? lockdep_hardirqs_on+0x7e/0x100\n [372.547092] ? _raw_spin_unlock_irqrestore+0x3e/0x60\n [372.555591] schedule+0xe0/0x270\n [372.561894] btrfs_commit_transaction+0x18bb/0x2610 [btrfs]\n [372.570506] ? btrfs_apply_pending_changes+0x50/0x50 [btrfs]\n [372.578875] ? free_unref_page+0x3f2/0x650\n [372.585484] ? finish_wait+0x270/0x270\n [372.591594] ? release_extent_buffer+0x224/0x420 [btrfs]\n [372.599264] btrfs_qgroup_rescan_worker+0xc13/0x10c0 [btrfs]\n [372.607157] ? lock_release+0x3a9/0x6d0\n [372.613054] ? btrfs_qgroup_account_extent+0xda0/0xda0 [btrfs]\n [372.620960] ? do_raw_spin_lock+0x11e/0x250\n [372.627137] ? rwlock_bug.part.0+0x90/0x90\n [372.633215] ? lock_is_held_type+0xe4/0x140\n [372.639404] btrfs_work_helper+0x1ae/0xa90 [btrfs]\n [372.646268] process_one_work+0x7e9/0x1320\n [372.652321] ? lock_release+0x6d0/0x6d0\n [372.658081] ? pwq_dec_nr_in_flight+0x230/0x230\n [372.664513] ? rwlock_bug.part.0+0x90/0x90\n [372.670529] worker_thread+0x59e/0xf90\n [372.676172] ? process_one_work+0x1320/0x1320\n [372.682440] kthread+0x3b9/0x490\n [372.687550] ? _raw_spin_unlock_irq+0x24/0x50\n [372.693811] ? set_kthread_struct+0x100/0x100\n [372.700052] ret_from_fork+0x22/0x30\n [372.705517] \u003c/TASK\u003e\n [372.709747] INFO: task btrfs-transacti:2347 blocked for more than 123 seconds.\n [372.729827] Not tainted 5.16.0-rc8 #7\n [372.745907] \"echo 0 \u003e /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\n [372.767106] task:btrfs-transacti state:D stack: 0 pid: 2347 ppid: 2 flags:0x00004000\n [372.787776] Call Trace:\n [372.801652] \u003cTASK\u003e\n [372.812961] __schedule+0xb56/0x4850\n [372.830011] ? io_schedule_timeout+0x190/0x190\n [372.852547] ? lockdep_hardirqs_on+0x7e/0x100\n [372.871761] ? _raw_spin_unlock_irqrestore+0x3e/0x60\n [372.886792] schedule+0xe0/0x270\n [372.901685] wait_current_trans+0x22c/0x310 [btrfs]\n [372.919743] ? btrfs_put_transaction+0x3d0/0x3d0 [btrfs]\n [372.938923] ? finish_wait+0x270/0x270\n [372.959085] ? join_transaction+0xc7\n---truncated---"
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"title": "btrfs: fix deadlock between quota disable and qgroup rescan worker",
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"assignerShortName": "Linux",
"cveId": "CVE-2022-48734",
"datePublished": "2024-06-20T11:13:21.392Z",
"dateReserved": "2024-06-20T11:09:39.053Z",
"dateUpdated": "2024-08-03T15:24:59.933Z",
"state": "PUBLISHED"
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"nvd": "{\"cve\":{\"id\":\"CVE-2022-48734\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-06-20T12:15:11.797\",\"lastModified\":\"2024-08-19T17:22:11.393\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbtrfs: fix deadlock between quota disable and qgroup rescan worker\\n\\nQuota disable ioctl starts a transaction before waiting for the qgroup\\nrescan worker completes. However, this wait can be infinite and results\\nin deadlock because of circular dependency among the quota disable\\nioctl, the qgroup rescan worker and the other task with transaction such\\nas block group relocation task.\\n\\nThe deadlock happens with the steps following:\\n\\n1) Task A calls ioctl to disable quota. It starts a transaction and\\n waits for qgroup rescan worker completes.\\n2) Task B such as block group relocation task starts a transaction and\\n joins to the transaction that task A started. Then task B commits to\\n the transaction. In this commit, task B waits for a commit by task A.\\n3) Task C as the qgroup rescan worker starts its job and starts a\\n transaction. In this transaction start, task C waits for completion\\n of the transaction that task A started and task B committed.\\n\\nThis deadlock was found with fstests test case btrfs/115 and a zoned\\nnull_blk device. The test case enables and disables quota, and the\\nblock group reclaim was triggered during the quota disable by chance.\\nThe deadlock was also observed by running quota enable and disable in\\nparallel with \u0027btrfs balance\u0027 command on regular null_blk devices.\\n\\nAn example report of the deadlock:\\n\\n [372.469894] INFO: task kworker/u16:6:103 blocked for more than 122 seconds.\\n [372.479944] Not tainted 5.16.0-rc8 #7\\n [372.485067] \\\"echo 0 \u003e /proc/sys/kernel/hung_task_timeout_secs\\\" disables this message.\\n [372.493898] task:kworker/u16:6 state:D stack: 0 pid: 103 ppid: 2 flags:0x00004000\\n [372.503285] Workqueue: btrfs-qgroup-rescan btrfs_work_helper [btrfs]\\n [372.510782] Call Trace:\\n [372.514092] \u003cTASK\u003e\\n [372.521684] __schedule+0xb56/0x4850\\n [372.530104] ? io_schedule_timeout+0x190/0x190\\n [372.538842] ? lockdep_hardirqs_on+0x7e/0x100\\n [372.547092] ? _raw_spin_unlock_irqrestore+0x3e/0x60\\n [372.555591] schedule+0xe0/0x270\\n [372.561894] btrfs_commit_transaction+0x18bb/0x2610 [btrfs]\\n [372.570506] ? btrfs_apply_pending_changes+0x50/0x50 [btrfs]\\n [372.578875] ? free_unref_page+0x3f2/0x650\\n [372.585484] ? finish_wait+0x270/0x270\\n [372.591594] ? release_extent_buffer+0x224/0x420 [btrfs]\\n [372.599264] btrfs_qgroup_rescan_worker+0xc13/0x10c0 [btrfs]\\n [372.607157] ? lock_release+0x3a9/0x6d0\\n [372.613054] ? btrfs_qgroup_account_extent+0xda0/0xda0 [btrfs]\\n [372.620960] ? do_raw_spin_lock+0x11e/0x250\\n [372.627137] ? rwlock_bug.part.0+0x90/0x90\\n [372.633215] ? lock_is_held_type+0xe4/0x140\\n [372.639404] btrfs_work_helper+0x1ae/0xa90 [btrfs]\\n [372.646268] process_one_work+0x7e9/0x1320\\n [372.652321] ? lock_release+0x6d0/0x6d0\\n [372.658081] ? pwq_dec_nr_in_flight+0x230/0x230\\n [372.664513] ? rwlock_bug.part.0+0x90/0x90\\n [372.670529] worker_thread+0x59e/0xf90\\n [372.676172] ? process_one_work+0x1320/0x1320\\n [372.682440] kthread+0x3b9/0x490\\n [372.687550] ? _raw_spin_unlock_irq+0x24/0x50\\n [372.693811] ? set_kthread_struct+0x100/0x100\\n [372.700052] ret_from_fork+0x22/0x30\\n [372.705517] \u003c/TASK\u003e\\n [372.709747] INFO: task btrfs-transacti:2347 blocked for more than 123 seconds.\\n [372.729827] Not tainted 5.16.0-rc8 #7\\n [372.745907] \\\"echo 0 \u003e /proc/sys/kernel/hung_task_timeout_secs\\\" disables this message.\\n [372.767106] task:btrfs-transacti state:D stack: 0 pid: 2347 ppid: 2 flags:0x00004000\\n [372.787776] Call Trace:\\n [372.801652] \u003cTASK\u003e\\n [372.812961] __schedule+0xb56/0x4850\\n [372.830011] ? io_schedule_timeout+0x190/0x190\\n [372.852547] ? lockdep_hardirqs_on+0x7e/0x100\\n [372.871761] ? _raw_spin_unlock_irqrestore+0x3e/0x60\\n [372.886792] schedule+0xe0/0x270\\n [372.901685] wait_current_trans+0x22c/0x310 [btrfs]\\n [372.919743] ? btrfs_put_transaction+0x3d0/0x3d0 [btrfs]\\n [372.938923] ? finish_wait+0x270/0x270\\n [372.959085] ? join_transaction+0xc7\\n---truncated---\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: btrfs: soluciona el punto muerto entre la desactivaci\u00f3n de cuota y el trabajador de rescaneo de qgroup. La desactivaci\u00f3n de cuota ioctl inicia una transacci\u00f3n antes de esperar a que se complete el trabajador de rescaneo de qgroup. Sin embargo, esta espera puede ser infinita y provocar un punto muerto debido a la dependencia circular entre el ioctl de desactivaci\u00f3n de cuota, el trabajador de rescaneo de qgroup y la otra tarea con transacciones como la tarea de reubicaci\u00f3n del grupo de bloques. El punto muerto ocurre con los siguientes pasos: 1) La tarea A llama a ioctl para deshabilitar la cuota. Inicia una transacci\u00f3n y espera a que se complete el trabajo de rescaneo de qgroup. 2) La tarea B, como la tarea de reubicaci\u00f3n del grupo de bloques, inicia una transacci\u00f3n y se une a la transacci\u00f3n que inici\u00f3 la tarea A. Luego la tarea B se compromete con la transacci\u00f3n. En esta confirmaci\u00f3n, la tarea B espera una confirmaci\u00f3n de la tarea A. 3) La tarea C, como trabajador de rescaneo de qgroup, inicia su trabajo e inicia una transacci\u00f3n. En el inicio de esta transacci\u00f3n, la tarea C espera a que se complete la transacci\u00f3n que inici\u00f3 la tarea A y confirm\u00f3 la tarea B. Este punto muerto se encontr\u00f3 con el caso de prueba btrfs/115 de fstests y un dispositivo null_blk zonificado. El caso de prueba habilita y deshabilita la cuota, y la recuperaci\u00f3n del grupo de bloques se activ\u00f3 durante la deshabilitaci\u00f3n de la cuota por casualidad. El punto muerto tambi\u00e9n se observ\u00f3 al ejecutar la habilitaci\u00f3n y deshabilitaci\u00f3n de cuotas en paralelo con el comando \u0027btrfs balance\u0027 en dispositivos null_blk normales. Un informe de ejemplo del punto muerto: [372.469894] INFORMACI\u00d3N: tarea kworker/u16:6:103 bloqueada durante m\u00e1s de 122 segundos. [372.479944] No contaminado 5.16.0-rc8 #7 [372.485067] \\\"echo 0 \u0026gt; /proc/sys/kernel/hung_task_timeout_secs\\\" desactiva este mensaje. [372.493898] tarea:kworker/u16:6 estado:D pila: 0 pid: 103 ppid: 2 banderas:0x00004000 [372.503285] Cola de trabajo: btrfs-qgroup-rescan btrfs_work_helper [btrfs] [372.510782] Seguimiento de llamadas: [372.521684] __programaci\u00f3n+0xb56/0x4850 [372.530104] ? io_schedule_timeout+0x190/0x190 [372.538842] ? lockdep_hardirqs_on+0x7e/0x100 [372.547092] ? _raw_spin_unlock_irqrestore+0x3e/0x60 [372.555591] horario+0xe0/0x270 [372.561894] btrfs_commit_transaction+0x18bb/0x2610 [btrfs] [372.570506] ? btrfs_apply_pending_changes+0x50/0x50 [btrfs] [372.578875] ? free_unref_page+0x3f2/0x650 [372.585484] ? terminar_esperar+0x270/0x270 [372.591594] ? release_extent_buffer+0x224/0x420 [btrfs] [372.599264] btrfs_qgroup_rescan_worker+0xc13/0x10c0 [btrfs] [372.607157] ? lock_release+0x3a9/0x6d0 [372.613054]? btrfs_qgroup_account_extent+0xda0/0xda0 [btrfs] [372.620960]? do_raw_spin_lock+0x11e/0x250 [372.627137]? rwlock_bug.part.0+0x90/0x90 [372.633215] ? lock_is_held_type+0xe4/0x140 [372.639404] btrfs_work_helper+0x1ae/0xa90 [btrfs] [372.646268] Process_one_work+0x7e9/0x1320 [372.652321] ? lock_release+0x6d0/0x6d0 [372.658081]? pwq_dec_nr_in_flight+0x230/0x230 [372.664513] ? rwlock_bug.part.0+0x90/0x90 [372.670529] trabajador_thread+0x59e/0xf90 [372.676172] ? proceso_one_work+0x1320/0x1320 [372.682440] kthread+0x3b9/0x490 [372.687550] ? _raw_spin_unlock_irq+0x24/0x50 [372.693811] ? set_kthread_struct+0x100/0x100 [372.700052] ret_from_fork+0x22/0x30 [372.705517] [372.709747] INFORMACI\u00d3N: tarea btrfs-transacti:2347 bloqueada durante m\u00e1s de 123 segundos. [372.729827] No contaminado 5.16.0-rc8 #7 [372.745907] \\\"echo 0 \u0026gt; /proc/sys/kernel/hung_task_timeout_secs\\\" desactiva este mensaje. [372.767106] tarea: btrfs-transacti estado: D pila: 0 pid: 2347 ppid: 2 banderas: 0x00004000 [372.787776] Seguimiento de llamadas: [372.801652] [372.812961] __schedule+0xb56/0x4850 [372.83 0011] ? io_schedule_timeout+0x190/0x190 [372.852547] ? lockdep_hardirqs_on+0x7e/0x100 [372.871761]? _raw_spin_unlock_irqrestore+0x3e/0x60 [372.886792] horario+0xe0/0x270 [372.901685] ---truncado---\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-667\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"5.4.178\",\"matchCriteriaId\":\"A55ED659-C576-45B7-A8B0-3CD30AA67FAB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.99\",\"matchCriteriaId\":\"FA1C3B80-458E-4F34-A0BF-5223557F2863\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.22\",\"matchCriteriaId\":\"74528AA6-B524-4C3F-B188-1194235FE47D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"5.16.8\",\"matchCriteriaId\":\"0623892A-E3E4-44E6-8A5E-39A0B47AF782\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/26b3901d20bf9da2c6a00cb1fb48932166f80a45\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/31198e58c09e21d4f65c49d2361f76b87aca4c3f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/32747e01436aac8ef93fe85b5b523b4f3b52f040\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/89d4cca583fc9594ee7d1a0bc986886d6fb587e6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e804861bd4e69cc5fe1053eedcb024982dde8e48\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
}
}
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