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Publication date:
In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> bus: mhi: pci_generic: Remove WQ_MEM_RECLAIM flag from state workqueue<br /> <br /> A recent change created a dedicated workqueue for the state-change work<br /> with WQ_HIGHPRI (no strong reason for that) and WQ_MEM_RECLAIM flags,<br /> but the state-change work (mhi_pm_st_worker) does not guarantee forward<br /> progress under memory pressure, and will even wait on various memory<br /> allocations when e.g. creating devices, loading firmware, etc... The<br /> work is then not part of a memory reclaim path...<br /> <br /> Moreover, this causes a warning in check_flush_dependency() since we end<br /> up in code that flushes a non-reclaim workqueue:<br /> <br /> [ 40.969601] workqueue: WQ_MEM_RECLAIM mhi_hiprio_wq:mhi_pm_st_worker [mhi] is flushing !WQ_MEM_RECLAIM events_highpri:flush_backlog<br /> [ 40.969612] WARNING: CPU: 4 PID: 158 at kernel/workqueue.c:2607 check_flush_dependency+0x11c/0x140<br /> [ 40.969733] Call Trace:<br /> [ 40.969740] __flush_work+0x97/0x1d0<br /> [ 40.969745] ? wake_up_process+0x15/0x20<br /> [ 40.969749] ? insert_work+0x70/0x80<br /> [ 40.969750] ? __queue_work+0x14a/0x3e0<br /> [ 40.969753] flush_work+0x10/0x20<br /> [ 40.969756] rollback_registered_many+0x1c9/0x510<br /> [ 40.969759] unregister_netdevice_queue+0x94/0x120<br /> [ 40.969761] unregister_netdev+0x1d/0x30<br /> [ 40.969765] mhi_net_remove+0x1a/0x40 [mhi_net]<br /> [ 40.969770] mhi_driver_remove+0x124/0x250 [mhi]<br /> [ 40.969776] device_release_driver_internal+0xf0/0x1d0<br /> [ 40.969778] device_release_driver+0x12/0x20<br /> [ 40.969782] bus_remove_device+0xe1/0x150<br /> [ 40.969786] device_del+0x17b/0x3e0<br /> [ 40.969791] mhi_destroy_device+0x9a/0x100 [mhi]<br /> [ 40.969796] ? mhi_unmap_single_use_bb+0x50/0x50 [mhi]<br /> [ 40.969799] device_for_each_child+0x5e/0xa0<br /> [ 40.969804] mhi_pm_st_worker+0x921/0xf50 [mhi]
Severity: Pending analysis
Last modification:

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