CVE - CVE-2024-43914

CVE-ID
CVE-2024-43914	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/2c92f8c1c456d556f15cbf51667b385026b2e6a0 URL:https://git.kernel.org/stable/c/2c92f8c1c456d556f15cbf51667b385026b2e6a0 MISC:https://git.kernel.org/stable/c/305a5170dc5cf3d395bb4c4e9239bca6d0b54b49 URL:https://git.kernel.org/stable/c/305a5170dc5cf3d395bb4c4e9239bca6d0b54b49 MISC:https://git.kernel.org/stable/c/3b33740c1750a39e046339ff9240e954f0156707 URL:https://git.kernel.org/stable/c/3b33740c1750a39e046339ff9240e954f0156707 MISC:https://git.kernel.org/stable/c/4811d6e5d9f4090c3e0ff9890eb24077108046ab URL:https://git.kernel.org/stable/c/4811d6e5d9f4090c3e0ff9890eb24077108046ab MISC:https://git.kernel.org/stable/c/6b33c468d543f6a83de2d61f09fec74b27e19fd2 URL:https://git.kernel.org/stable/c/6b33c468d543f6a83de2d61f09fec74b27e19fd2 MISC:https://git.kernel.org/stable/c/775a9ba16c9ffe98fe54ebf14e55d5660f2bf600 URL:https://git.kernel.org/stable/c/775a9ba16c9ffe98fe54ebf14e55d5660f2bf600 MISC:https://git.kernel.org/stable/c/bf0ff69a42a3d2d46876d0514ecf13dffc516666 URL:https://git.kernel.org/stable/c/bf0ff69a42a3d2d46876d0514ecf13dffc516666 MISC:https://git.kernel.org/stable/c/c384dd4f1fb3b14a2fd199360701cc163ea88705 URL:https://git.kernel.org/stable/c/c384dd4f1fb3b14a2fd199360701cc163ea88705
Assigning CNA
kernel.org
Date Record Created
20240817	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240817)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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