cve-2024-38598
Vulnerability from cvelistv5
Published
2024-06-19 13:45
Modified
2024-09-11 17:34
Severity
Summary
md: fix resync softlockup when bitmap size is less than array size
References
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[mdX_resync:6976]\\nCPU: 7 PID: 3588 Comm: mdX_resync Kdump: loaded Not tainted 6.9.0-rc4-next-20240419 #1\\nRIP: 0010:_raw_spin_unlock_irq+0x13/0x30\\nCall Trace:\\n \u003cTASK\u003e\\n md_bitmap_start_sync+0x6b/0xf0\\n raid10_sync_request+0x25c/0x1b40 [raid10]\\n md_do_sync+0x64b/0x1020\\n md_thread+0xa7/0x170\\n kthread+0xcf/0x100\\n ret_from_fork+0x30/0x50\\n ret_from_fork_asm+0x1a/0x30\\n\\nAnd the detailed process is as follows:\\n\\nmd_do_sync\\n j = mddev-\u003eresync_min\\n while (j \u003c max_sectors)\\n sectors = raid10_sync_request(mddev, j, \u0026skipped)\\n if (!md_bitmap_start_sync(..., \u0026sync_blocks))\\n // md_bitmap_start_sync set sync_blocks to 0\\n return sync_blocks + sectors_skippe;\\n // sectors = 0;\\n j += sectors;\\n // j never change\\n\\nRoot cause is that commit 301867b1c168 (\\\"md/raid10: check\\nslab-out-of-bounds in md_bitmap_get_counter\\\") return early from\\nmd_bitmap_get_counter(), without setting returned blocks.\\n\\nFix this problem by always set returned blocks from\\nmd_bitmap_get_counter\\\"(), as it used to be.\\n\\nNoted that this patch just fix the softlockup problem in kernel, the\\ncase that bitmap size doesn\u0027t match array size still need to be fixed.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: md: corrige el bloqueo suave de resincronizaci\u00f3n cuando el tama\u00f1o del mapa de bits es menor que el tama\u00f1o de la matriz. Se informa que para dm-raid10, lvextend + lvchange --syncaction activar\u00e1 el siguiente bloqueo suave: kernel:watchdog: ERROR : bloqueo suave - \u00a1CPU n.\u00b0 3 bloqueada durante 26 segundos! [mdX_resync:6976] CPU: 7 PID: 3588 Comm: mdX_resync Kdump: cargado No contaminado 6.9.0-rc4-next-20240419 #1 RIP: 0010:_raw_spin_unlock_irq+0x13/0x30 Seguimiento de llamadas: md_bitmap_start_sync+0x6b/0xf0 raid10_sync_request+0x25c/0x1b40 [raid10] md_do_sync+0x64b/0x1020 md_thread+0xa7/0x170 kthread+0xcf/0x100 ret_from_fork+0x30/0x50 ret_from_fork_asm+0x1a/0x30 Y el proceso detallado es el siguiente: _sync j = mddev-\u0026gt;resync_min mientras ( j \u0026lt; max_sectors) sectores = raid10_sync_request(mddev, j, \u0026amp;skipped) if (!md_bitmap_start_sync(..., \u0026amp;sync_blocks)) // md_bitmap_start_sync establece sync_blocks en 0 return sync_blocks + sectores_skippe; // sectores = 0; j += sectores; // j nunca cambia La causa principal es que el commit 301867b1c168 (\\\"md/raid10: check slab-out-of-bounds in md_bitmap_get_counter\\\") regresa antes de md_bitmap_get_counter(), sin configurar los bloques devueltos. 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