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CVE-2024-38598

md: fix resync softlockup when bitmap size is less than array size

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 4.19.316, 5.4.278, 5.10.219, 5.15.161, 6.1.93, and 5 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

Summary

In the Linux kernel, the following vulnerability has been resolved: md: fix resync softlockup when bitmap size is less than array size Is is reported that for dm-raid10, lvextend + lvchange --syncaction will trigger following softlockup: kernel:watchdog: BUG: soft lockup - CPU#3 stuck for 26s! [mdX_resync:6976] CPU: 7 PID: 3588 Comm: mdX_resync Kdump: loaded Not tainted 6.9.0-rc4-next-20240419 #1 RIP: 0010:_raw_spin_unlock_irq+0x13/0x30 Call Trace: <TASK> md_bitmap_start_sync+0x6b/0xf0 raid10_sync_request+0x25c/0x1b40 [raid10] md_do_sync+0x64b/0x1020 md_thread+0xa7/0x170 kthread+0xcf/0x100 ret_from_fork+0x30/0x50 ret_from_fork_asm+0x1a/0x30 And the detailed process is as follows: md_do_sync j = mddev->resync_min while (j < max_sectors) sectors = raid10_sync_request(mddev, j, &skipped) if (!md_bitmap_start_sync(..., &sync_blocks)) // md_bitmap_start_sync set sync_blocks to 0 return sync_blocks + sectors_skippe; // sectors = 0; j += sectors; // j never change Root cause is that commit 301867b1c168 ("md/raid10: check slab-out-of-bounds in md_bitmap_get_counter") return early from md_bitmap_get_counter(), without setting returned blocks. Fix this problem by always set returned blocks from md_bitmap_get_counter"(), as it used to be. Noted that this patch just fix the softlockup problem in kernel, the case that bitmap size doesn't match array size still need to be fixed.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From 374fb914304d9b500721007f3837ea8f1f9a2418 · fixed in d4b9c764d48fa41caa24cfb4275f3aa9fb4bd798; From b0b971fe7d61411ede63c3291764dbde1577ef2c · fixed in 43771597feba89a839c5f893716df88ae5c237ce; From 39fa14e824acfd470db4f42c354297456bd82b53 · fixed in 3f5b73ef8fd6268cbc968b308d8eafe56fda97f3; From a134dd582c0d5b6068efa308bd485cf1d00b3f65 · fixed in 69296914bfd508c85935bf5f711cad9b0fe78492; From be1a3ec63a840cc9e59a033acf154f56255699a1 · fixed in 71e8e4f288e74a896b6d9cd194f3bab12bd7a10f; From 301867b1c16805aebbc306aafa6ecdc68b73c7e5 · fixed in c9566b812c8f66160466cc1e29df6d3646add0b1; From 301867b1c16805aebbc306aafa6ecdc68b73c7e5 · fixed in 5817f43ae1a118855676f57ef7ab50e37eac7482; From 301867b1c16805aebbc306aafa6ecdc68b73c7e5 · fixed in 8bbc71315e0ae4bb7e37f8d43b915e1cb01a481b; From 301867b1c16805aebbc306aafa6ecdc68b73c7e5 · fixed in f0e729af2eb6bee9eb58c4df1087f14ebaefe26b; From 4.19.291 · fixed in 4.19.316; From 5.4.251 · fixed in 5.4.278; From 5.10.188 · fixed in 5.10.219; From 5.15.121 · fixed in 5.15.161; From 6.1.39 · fixed in 6.1.93; From 6.3.13 · fixed in 6.4; From 6.4.4 · fixed in 6.5

  • Linux Linux

    6.5

  • KernelLinux

    fixed in 4.19.316; From 4.20.0 · fixed in 5.4.278; From 5.5.0 · fixed in 5.10.219; From 5.11.0 · fixed in 5.15.161; From 5.16.0 · fixed in 6.1.93; From 6.2.0 · fixed in 6.6.33; From 6.5.0 · fixed in 6.8.12; From 6.7.0 · fixed in 6.9.3

References 9

git.kernel.org