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CVE PROGRAM SOURCE RECORDUnscored

CVE-2022-49986

scsi: storvsc: Remove WQ_MEM_RECLAIM from storvsc_error_wq

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: scsi: storvsc: Remove WQ_MEM_RECLAIM from storvsc_error_wq storvsc_error_wq workqueue should not be marked as WQ_MEM_RECLAIM as it doesn't need to make forward progress under memory pressure. Marking this workqueue as WQ_MEM_RECLAIM may cause deadlock while flushing a non-WQ_MEM_RECLAIM workqueue. In the current state it causes the following warning: [ 14.506347] ------------[ cut here ]------------ [ 14.506354] workqueue: WQ_MEM_RECLAIM storvsc_error_wq_0:storvsc_remove_lun is flushing !WQ_MEM_RECLAIM events_freezable_power_:disk_events_workfn [ 14.506360] WARNING: CPU: 0 PID: 8 at <-snip->kernel/workqueue.c:2623 check_flush_dependency+0xb5/0x130 [ 14.506390] CPU: 0 PID: 8 Comm: kworker/u4:0 Not tainted 5.4.0-1086-azure #91~18.04.1-Ubuntu [ 14.506391] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1 05/09/2022 [ 14.506393] Workqueue: storvsc_error_wq_0 storvsc_remove_lun [ 14.506395] RIP: 0010:check_flush_dependency+0xb5/0x130 <-snip-> [ 14.506408] Call Trace: [ 14.506412] __flush_work+0xf1/0x1c0 [ 14.506414] __cancel_work_timer+0x12f/0x1b0 [ 14.506417] ? kernfs_put+0xf0/0x190 [ 14.506418] cancel_delayed_work_sync+0x13/0x20 [ 14.506420] disk_block_events+0x78/0x80 [ 14.506421] del_gendisk+0x3d/0x2f0 [ 14.506423] sr_remove+0x28/0x70 [ 14.506427] device_release_driver_internal+0xef/0x1c0 [ 14.506428] device_release_driver+0x12/0x20 [ 14.506429] bus_remove_device+0xe1/0x150 [ 14.506431] device_del+0x167/0x380 [ 14.506432] __scsi_remove_device+0x11d/0x150 [ 14.506433] scsi_remove_device+0x26/0x40 [ 14.506434] storvsc_remove_lun+0x40/0x60 [ 14.506436] process_one_work+0x209/0x400 [ 14.506437] worker_thread+0x34/0x400 [ 14.506439] kthread+0x121/0x140 [ 14.506440] ? process_one_work+0x400/0x400 [ 14.506441] ? kthread_park+0x90/0x90 [ 14.506443] ret_from_fork+0x35/0x40 [ 14.506445] ---[ end trace 2d9633159fdc6ee7 ]---

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 436ad941335386c5fc7faa915a8fbdfe8c908084 to < b692c238ddfa61f00d97c4c1f021425d132ba96faffected
  • 436ad941335386c5fc7faa915a8fbdfe8c908084 to < b4c928ace9a123629eeb14ec5d7ee8f73e5ac668affected
  • 436ad941335386c5fc7faa915a8fbdfe8c908084 to < 46fcb0fc884db78a0384be92cc2a51927e6581b8affected
  • 436ad941335386c5fc7faa915a8fbdfe8c908084 to < cd2a50d0a097a42b6de283377da98ff757505120affected
  • 436ad941335386c5fc7faa915a8fbdfe8c908084 to < 828f57ac75eaccd6607ee4d1468d34e983e32c68affected
  • 436ad941335386c5fc7faa915a8fbdfe8c908084 to < d957e7ffb2c72410bcc1a514153a46719255a5daaffected

Linux Linux

Default version status: affected

  • 4.15affected
  • 0 to < 4.15unaffected
  • 4.19.257 to ≤ 4.19.*unaffected
  • 5.4.212 to ≤ 5.4.*unaffected
  • 5.10.140 to ≤ 5.10.*unaffected
  • 5.15.64 to ≤ 5.15.*unaffected
  • 5.19.6 to ≤ 5.19.*unaffected
  • 6.0 to ≤ *unaffected

References