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CVE PROGRAM SOURCE RECORDUnscored

CVE-2024-38598

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

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 374fb914304d9b500721007f3837ea8f1f9a2418 to < d4b9c764d48fa41caa24cfb4275f3aa9fb4bd798affected
  • b0b971fe7d61411ede63c3291764dbde1577ef2c to < 43771597feba89a839c5f893716df88ae5c237ceaffected
  • 39fa14e824acfd470db4f42c354297456bd82b53 to < 3f5b73ef8fd6268cbc968b308d8eafe56fda97f3affected
  • a134dd582c0d5b6068efa308bd485cf1d00b3f65 to < 69296914bfd508c85935bf5f711cad9b0fe78492affected
  • be1a3ec63a840cc9e59a033acf154f56255699a1 to < 71e8e4f288e74a896b6d9cd194f3bab12bd7a10faffected
  • 301867b1c16805aebbc306aafa6ecdc68b73c7e5 to < c9566b812c8f66160466cc1e29df6d3646add0b1affected
  • 301867b1c16805aebbc306aafa6ecdc68b73c7e5 to < 5817f43ae1a118855676f57ef7ab50e37eac7482affected
  • 301867b1c16805aebbc306aafa6ecdc68b73c7e5 to < 8bbc71315e0ae4bb7e37f8d43b915e1cb01a481baffected
  • 301867b1c16805aebbc306aafa6ecdc68b73c7e5 to < f0e729af2eb6bee9eb58c4df1087f14ebaefe26baffected
  • 152bb26796ff054af50b2ee1b3ca56e364e4f61baffected
  • bea301c046110bf421a3ce153fb868cb8d618e90affected
  • 4.19.291 to < 4.19.316affected
  • 5.4.251 to < 5.4.278affected
  • 5.10.188 to < 5.10.219affected
  • 5.15.121 to < 5.15.161affected
  • 6.1.39 to < 6.1.93affected
  • 6.3.13 to < 6.4affected
  • 6.4.4 to < 6.5affected

Linux Linux

Default version status: affected

  • 6.5affected
  • 0 to < 6.5unaffected
  • 4.19.316 to ≤ 4.19.*unaffected
  • 5.4.278 to ≤ 5.4.*unaffected
  • 5.10.219 to ≤ 5.10.*unaffected
  • 5.15.161 to ≤ 5.15.*unaffected
  • 6.1.93 to ≤ 6.1.*unaffected
  • 6.6.33 to ≤ 6.6.*unaffected
  • 6.8.12 to ≤ 6.8.*unaffected
  • 6.9.3 to ≤ 6.9.*unaffected
  • 6.10 to ≤ *unaffected

References