CVE-2024-26755

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

md: Don't suspend the array for interrupted reshape

md_start_sync() will suspend the array if there are spares that can be

added or removed from conf, however, if reshape is still in progress,

this won't happen at all or data will be corrupted(remove_and_add_spares

won't be called from md_choose_sync_action for reshape), hence there is

no need to suspend the array if reshape is not done yet.

Meanwhile, there is a potential deadlock for raid456:

1) reshape is interrupted;

2) set one of the disk WantReplacement, and add a new disk to the array,

however, recovery won't start until the reshape is finished;

3) then issue an IO across reshpae position, this IO will wait for

reshape to make progress;

4) continue to reshape, then md_start_sync() found there is a spare disk

that can be added to conf, mddev_suspend() is called;

Step 4 and step 3 is waiting for each other, deadlock triggered. Noted

this problem i

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References