CVE-2024-26962
- Source
- https://cve.org/CVERecord?id=CVE-2024-26962
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-26962.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2024-26962
- Downstream
BELL (1)
DEBIAN (1)
ECHO (1)
RHSA (1)
ROOT (3)
SUSE (7)
- Related
- Published
- 2024-05-01T05:19:20Z
- Modified
- 2026-10-08T02:48:05Z
- Summary
- dm-raid456, md/raid456: fix a deadlock for dm-raid456 while io concurrent with reshape
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
dm-raid456, md/raid456: fix a deadlock for dm-raid456 while io concurrent with reshape
For raid456, if reshape is still in progress, then IO across reshape position will wait for reshape to make progress. However, for dm-raid, in following cases reshape will never make progress hence IO will hang:
- the array is read-only;
- MD_RECOVERY_WAIT is set;
- MD_RECOVERY_FROZEN is set;
After commit c467e97f079f ("md/raid6: use valid sector values to determine if an I/O should wait on the reshape") fix the problem that IO across reshape position doesn't wait for reshape, the dm-raid test shell/lvconvert-raid-reshape.sh start to hang:
[root@fedora ~]# cat /proc/979/stack [<0>] wait_woken+0x7d/0x90 [<0>] raid5_make_request+0x929/0x1d70 [raid456] [<0>] md_handle_request+0xc2/0x3b0 [md_mod] [<0>] raid_map+0x2c/0x50 [dm_raid] [<0>] __map_bio+0x251/0x380 [dm_mod] [<0>] dm_submit_bio+0x1f0/0x760 [dm_mod] [<0>] __submit_bio+0xc2/0x1c0 [<0>] submit_bio_noacct_nocheck+0x17f/0x450 [<0>] submit_bio_noacct+0x2bc/0x780 [<0>] submit_bio+0x70/0xc0 [<0>] mpage_readahead+0x169/0x1f0 [<0>] blkdev_readahead+0x18/0x30 [<0>] read_pages+0x7c/0x3b0 [<0>] page_cache_ra_unbounded+0x1ab/0x280 [<0>] force_page_cache_ra+0x9e/0x130 [<0>] page_cache_sync_ra+0x3b/0x110 [<0>] filemap_get_pages+0x143/0xa30 [<0>] filemap_read+0xdc/0x4b0 [<0>] blkdev_read_iter+0x75/0x200 [<0>] vfs_read+0x272/0x460 [<0>] ksys_read+0x7a/0x170 [<0>] __x64_sys_read+0x1c/0x30 [<0>] do_syscall_64+0xc6/0x230 [<0>] entry_SYSCALL_64_after_hwframe+0x6c/0x74
This is because reshape can't make progress.
For md/raid, the problem doesn't exist because register new sync_thread doesn't rely on the IO to be done any more:
- If array is read-only, it can switch to read-write by ioctl/sysfs;
- md/raid never set MD_RECOVERY_WAIT;
- If MD_RECOVERY_FROZEN is set, mddev_suspend() doesn't hold 'reconfig_mutex', hence it can be cleared and reshape can continue by sysfs api 'sync_action'.
However, I'm not sure yet how to avoid the problem in dm-raid yet. This patch on the one hand make sure raid_message() can't change sync_thread() through raid_message() after presuspend(), on the other hand detect the above 3 cases before wait for IO do be done in dm_suspend(), and let dm-raid requeue those IO.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26962.json" }- References
-
- https://git.kernel.org/stable/c/41425f96d7aa59bc865f60f5dda3d7697b555677
- https://git.kernel.org/stable/c/5943a34bf6bab5801e08a55f63e1b8d5bc90dae1
- https://git.kernel.org/stable/c/a8d249d770cb357d16a2097b548d2e4c1c137304
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26962.json
- https://nvd.nist.gov/vuln/detail/CVE-2024-26962
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedc467e97f079f0019870c314996fae952cc768e82Fixed5943a34bf6bab5801e08a55f63e1b8d5bc90dae1Fixeda8d249d770cb357d16a2097b548d2e4c1c137304Fixed41425f96d7aa59bc865f60f5dda3d7697b555677
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6.1.68Fixed6.2
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6.6.7Fixed6.7
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced515d971cd26a40f710490d1566783f9c62b46d61
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced4ce431c297558e30baa9226243a15d818320742b