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THREATINT
PUBLISHED

CVE-2024-26756

md: Don't register sync_thread for reshape directly



Description

In the Linux kernel, the following vulnerability has been resolved: md: Don't register sync_thread for reshape directly Currently, if reshape is interrupted, then reassemble the array will register sync_thread directly from pers->run(), in this case 'MD_RECOVERY_RUNNING' is set directly, however, there is no guarantee that md_do_sync() will be executed, hence stop_sync_thread() will hang because 'MD_RECOVERY_RUNNING' can't be cleared. Last patch make sure that md_do_sync() will set MD_RECOVERY_DONE, however, following hang can still be triggered by dm-raid test shell/lvconvert-raid-reshape.sh occasionally: [root@fedora ~]# cat /proc/1982/stack [<0>] stop_sync_thread+0x1ab/0x270 [md_mod] [<0>] md_frozen_sync_thread+0x5c/0xa0 [md_mod] [<0>] raid_presuspend+0x1e/0x70 [dm_raid] [<0>] dm_table_presuspend_targets+0x40/0xb0 [dm_mod] [<0>] __dm_destroy+0x2a5/0x310 [dm_mod] [<0>] dm_destroy+0x16/0x30 [dm_mod] [<0>] dev_remove+0x165/0x290 [dm_mod] [<0>] ctl_ioctl+0x4bb/0x7b0 [dm_mod] [<0>] dm_ctl_ioctl+0x11/0x20 [dm_mod] [<0>] vfs_ioctl+0x21/0x60 [<0>] __x64_sys_ioctl+0xb9/0xe0 [<0>] do_syscall_64+0xc6/0x230 [<0>] entry_SYSCALL_64_after_hwframe+0x6c/0x74 Meanwhile mddev->recovery is: MD_RECOVERY_RUNNING | MD_RECOVERY_INTR | MD_RECOVERY_RESHAPE | MD_RECOVERY_FROZEN Fix this problem by remove the code to register sync_thread directly from raid10 and raid5. And let md_check_recovery() to register sync_thread.

Reserved 2024-02-19 | Published 2024-04-03 | Updated 2024-12-19 | Assigner Linux

Product status

Default status
unaffected

f67055780caac6a99f43834795c43acf99eba6a6 before 13b520fb62b772e408f9b79c5fe18ad414e90417
affected

f67055780caac6a99f43834795c43acf99eba6a6 before ad39c08186f8a0f221337985036ba86731d6aafe
affected

Default status
affected

2.6.17
affected

Any version before 2.6.17
unaffected

6.7.7
unaffected

6.8
unaffected

References

git.kernel.org/...c/13b520fb62b772e408f9b79c5fe18ad414e90417

git.kernel.org/...c/ad39c08186f8a0f221337985036ba86731d6aafe

cve.org (CVE-2024-26756)

nvd.nist.gov (CVE-2024-26756)

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