Bug 2311720 (CVE-2024-45023)

Summary: CVE-2024-45023 kernel: md/raid1: Fix data corruption for degraded array with slow disk
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Bug Depends On: 2311769    
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Description OSIDB Bzimport 2024-09-11 16:21:15 UTC 
In the Linux kernel, the following vulnerability has been resolved:

md/raid1: Fix data corruption for degraded array with slow disk

read_balance() will avoid reading from slow disks as much as possible,
however, if valid data only lands in slow disks, and a new normal disk
is still in recovery, unrecovered data can be read:

raid1_read_request
 read_balance
  raid1_should_read_first
  -> return false
  choose_best_rdev
  -> normal disk is not recovered, return -1
  choose_bb_rdev
  -> missing the checking of recovery, return the normal disk
 -> read unrecovered data

Root cause is that the checking of recovery is missing in
choose_bb_rdev(). Hence add such checking to fix the problem.

Also fix similar problem in choose_slow_rdev().
Comment 1 Michal Findra 2024-09-11 17:38:53 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024091109-CVE-2024-45023-d7f2@gregkh/T