CVE-2024-43914

Summary

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

md/raid5: avoid BUG_ON() while continue reshape after reassembling

Currently, mdadm support –revert-reshape to abort the reshape while reassembling, as the test 07revert-grow. However, following BUG_ON() can be triggerred by the test:

kernel BUG at drivers/md/raid5.c:6278! invalid opcode: 0000 [#1] PREEMPT SMP PTI irq event stamp: 158985 CPU: 6 PID: 891 Comm: md0_reshape Not tainted 6.9.0-03335-g7592a0b0049a #94 RIP: 0010:reshape_request+0x3f1/0xe60 Call Trace: <TASK> raid5_sync_request+0x43d/0x550 md_do_sync+0xb7a/0x2110 md_thread+0x294/0x2b0 kthread+0x147/0x1c0 ret_from_fork+0x59/0x70 ret_from_fork_asm+0x1a/0x30 </TASK>

Root cause is that –revert-reshape update the raid_disks from 5 to 4, while reshape position is still set, and after reassembling the array, reshape position will be read from super block, then during reshape the checking of 'writepos' that is caculated by old reshape position will fail.

Fix this panic the easy way first, by converting the BUG_ON() to WARN_ON(), and stop the reshape if checkings fail.

Noted that mdadm must fix –revert-shape as well, and probably md/raid should enhance metadata validation as well, however this means reassemble will fail and there must be user tools to fix the wrong metadata.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxec32a2bd35bd6b933a5db6542c48210ce069a376 < 2c92f8c1c456d556f15cbf51667b385026b2e6a0affected
LinuxLinuxec32a2bd35bd6b933a5db6542c48210ce069a376 < 6b33c468d543f6a83de2d61f09fec74b27e19fd2affected
LinuxLinuxec32a2bd35bd6b933a5db6542c48210ce069a376 < c384dd4f1fb3b14a2fd199360701cc163ea88705affected
LinuxLinuxec32a2bd35bd6b933a5db6542c48210ce069a376 < bf0ff69a42a3d2d46876d0514ecf13dffc516666affected
LinuxLinuxec32a2bd35bd6b933a5db6542c48210ce069a376 < 3b33740c1750a39e046339ff9240e954f0156707affected
LinuxLinuxec32a2bd35bd6b933a5db6542c48210ce069a376 < 775a9ba16c9ffe98fe54ebf14e55d5660f2bf600affected
LinuxLinuxec32a2bd35bd6b933a5db6542c48210ce069a376 < 4811d6e5d9f4090c3e0ff9890eb24077108046abaffected
LinuxLinuxec32a2bd35bd6b933a5db6542c48210ce069a376 < 305a5170dc5cf3d395bb4c4e9239bca6d0b54b49affected
LinuxLinux2.6.30affected
LinuxLinux0 < 2.6.30unaffected
LinuxLinux4.19.320 <= 4.19.*unaffected
LinuxLinux5.4.282 <= 5.4.*unaffected
LinuxLinux5.10.224 <= 5.10.*unaffected
LinuxLinux5.15.165 <= 5.15.*unaffected
LinuxLinux6.1.105 <= 6.1.*unaffected
LinuxLinux6.6.46 <= 6.6.*unaffected
LinuxLinux6.10.5 <= 6.10.*unaffected
LinuxLinux6.11 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References