CVE-2021-47189
Vulnerability from cvelistv5
Published
2024-04-10 18:56
Modified
2024-11-04 12:01
Summary
btrfs: fix memory ordering between normal and ordered work functions
Impacted products
Vendor Product Version
Linux Linux Version: 3.15
Show details on NVD website


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    "dateReserved": "2024-03-25T09:12:14.113Z",
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The call trace was similar to:\\n\\n    pc : submit_compressed_extents+0x38/0x3d0\\n    lr : async_cow_submit+0x50/0xd0\\n    sp : ffff800015d4bc20\\n\\n    \u003cregisters omitted for brevity\u003e\\n\\n    Call trace:\\n     submit_compressed_extents+0x38/0x3d0\\n     async_cow_submit+0x50/0xd0\\n     run_ordered_work+0xc8/0x280\\n     btrfs_work_helper+0x98/0x250\\n     process_one_work+0x1f0/0x4ac\\n     worker_thread+0x188/0x504\\n     kthread+0x110/0x114\\n     ret_from_fork+0x10/0x18\\n\\nFix this by adding respective barrier calls which ensure that all\\naccesses preceding setting of WORK_DONE_BIT are strictly ordered before\\nsetting the flag. At the same time add a read barrier after reading of\\nWORK_DONE_BIT in run_ordered_work which ensures all subsequent loads\\nwould be strictly ordered after reading the bit. 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El seguimiento de llamadas fue similar a: pc : submission_compressed_extents+0x38/0x3d0 lr : async_cow_submit+0x50/0xd0 sp : ffff800015d4bc20  Seguimiento de llamadas: submission_compressed_extents+0x38/0x3d0 async_cow_submit+0x50/0xd0 run_ordered_work+0xc8/0x280 btrfs_work_helper+0x98/0x250 process_one_work+0x1f0/0x4ac worker_thread+0x188/0x504 kthread+0x110/0x114 ret_from_fork+0x10/0x18 Solucione esto agregando las llamadas de barrera respectivas que garantizan que todos los accesos anteriores a la configuraci\u00f3n de Los bits WORK_DONE_BIT se ordenan estrictamente antes de establecer la bandera. Al mismo tiempo, agregue una barrera de lectura despu\u00e9s de la lectura de WORK_DONE_BIT en run_ordered_work que garantiza que todas las cargas posteriores se ordenar\u00e1n estrictamente despu\u00e9s de leer el bit. 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  }
}


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