CVE-2024-26755

published 2024-04-03

CVE-2024-26755: 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…

Priority P4 24 medium 5.3 CVSS 3.1

AV N AC L PR N UI N S U C N I N A L

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 is found by code review, and it's not reporduced yet.

Fix this porblem by don't suspend the array for interrupted reshape,
this is safe because conf won't be changed until reshape is done.

Affected

8 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.7.7-1 (forky)	linux 6.7.7-1 (forky)
linux	linux	—	—
linux	linux	>= bc08041b32abe6c9824f78735bac22018eabfc06 < 60d6130d0ac1d883ed93c2a1e10aadb60967fd48	60d6130d0ac1d883ed93c2a1e10aadb60967fd48
linux	linux	>= bc08041b32abe6c9824f78735bac22018eabfc06 < 9e46c70e829bddc24e04f963471e9983a11598b7	9e46c70e829bddc24e04f963471e9983a11598b7
linux	linux_kernel	—	—
linux	linux_kernel	>= 0 < 6.7.7-1	6.7.7-1
linux	linux_kernel	>= 0 < 6.7.7-1	6.7.7-1
linux	linux_kernel	>= 6.7 < 6.7.7	6.7.7

CVSS provenance

nvd v3.1 5.3 MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

osv 5.3 MEDIUM

vendor_debian 5.3 LOW

vendor_redhat 5.3 MEDIUM

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