Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: md: wake raid456 reshape waiters before suspend During raid456 reshape, direct IO across the reshape position can sleep in raid5_make_request() waiting for reshape progress while still holding an active_io reference. If userspace then freezes reshape and writes md/suspend_lo or md/suspend_hi, mddev_suspend() kills active_io and waits for all in-flight IO to drain. This can deadlock: the IO needs reshape progress to continue, but the reshape thread is already frozen, so the active_io reference is never dropped and suspend never completes. raid5_prepare_suspend() already wakes wait_for_reshape for dm-raid. Do the same for normal md suspend when reshape is already interrupted, so waiting raid456 IO can abort, drop its reference, and let suspend finish. The mdadm test tests/25raid456-reshape-deadlock reproduces the hang.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 714d20150ed85811193ae07a494d91f9927c590f before 8b6a72420821e6da2cab6a69d5233500d2698b93; affected 714d20150ed85811193ae07a494d91f9927c590f before ff6b93410192b812d73cc54062529715b2dc849f; affected 714d20150ed85811193ae07a494d91f9927c590f before 8ae3e14d7f3df58f7f49c02d74344e3dcd5f84f0; affected 714d20150ed85811193ae07a494d91f9927c590f before cf86bb53b9c92354904a328e947a05ffbfdd1840; affected 2284eab166f2df83f94f0422e15dc9e73b278abf; affected 6.6.160 before 6.7 |
| Linux / Linux | affected 6.7; unaffected 0 before 6.7; unaffected 6.12.91 through 6.12.*; unaffected 6.18.33 through 6.18.*; unaffected 7.0.10 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.