CVE-2024-38598: md: fix resync softlockup when bitmap size is less than array size
First published: Wed Jun 19 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=4.19.291<4.19.316 | |
| Linux Linux kernel | >=5.4.251<5.4.278 | |
| Linux Linux kernel | >=5.10.188<5.10.219 | |
| Linux Linux kernel | >=5.15.121<5.15.161 | |
| Linux Linux kernel | >=6.1.39<6.1.93 | |
| Linux Linux kernel | >=6.5<6.6.33 | |
| Linux Linux kernel | >=6.7<6.8.12 | |
| Linux Linux kernel | >=6.9<6.9.3 | |
| redhat/kernel | <4.19.316 | 4.19.316 |
| redhat/kernel | <5.4.278 | 5.4.278 |
| redhat/kernel | <5.10.219 | 5.10.219 |
| redhat/kernel | <5.15.161 | 5.15.161 |
| redhat/kernel | <6.1.93 | 6.1.93 |
| redhat/kernel | <6.6.33 | 6.6.33 |
| redhat/kernel | <6.8.12 | 6.8.12 |
| redhat/kernel | <6.9.3 | 6.9.3 |
| redhat/kernel | <6.10 | 6.10 |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.11.10-1 6.12.3-1 |
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Reference Links
- https://git.kernel.org/stable/c/3f5b73ef8fd6268cbc968b308d8eafe56fda97f3
- https://git.kernel.org/stable/c/43771597feba89a839c5f893716df88ae5c237ce
- https://git.kernel.org/stable/c/5817f43ae1a118855676f57ef7ab50e37eac7482
- https://git.kernel.org/stable/c/69296914bfd508c85935bf5f711cad9b0fe78492
- https://git.kernel.org/stable/c/71e8e4f288e74a896b6d9cd194f3bab12bd7a10f
- https://git.kernel.org/stable/c/8bbc71315e0ae4bb7e37f8d43b915e1cb01a481b
- https://git.kernel.org/stable/c/c9566b812c8f66160466cc1e29df6d3646add0b1
- https://git.kernel.org/stable/c/d4b9c764d48fa41caa24cfb4275f3aa9fb4bd798
- https://git.kernel.org/stable/c/f0e729af2eb6bee9eb58c4df1087f14ebaefe26b
- https://launchpad.net/bugs/cve/CVE-2024-38598
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-38598
- https://nvd.nist.gov/vuln/detail/CVE-2024-38598
- https://security-tracker.debian.org/tracker/CVE-2024-38598
- https://ubuntu.com/security/CVE-2024-38598
- https://git.kernel.org/linus/f0e729af2eb6bee9eb58c4df1087f14ebaefe26b
- https://access.redhat.com/security/cve/CVE-2024-38598
- https://lore.kernel.org/linux-cve-announce/2024061956-CVE-2024-38598-8629@gregkh/T
- https://access.redhat.com/errata/RHSA-2024:5101
- https://access.redhat.com/errata/RHSA-2024:6993
- https://access.redhat.com/errata/RHSA-2024:9315
- https://bugzilla.redhat.com/show_bug.cgi?id=2293367
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