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CVE-2024-38598

Description

In the Linux kernel, the following vulnerability has been resolved:md: fix resync softlockup when bitmap size is less than array sizeIs is reported that for dm-raid10, lvextend + lvchange --syncaction willtrigger 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 #1RIP: 0010:_raw_spin_unlock_irq+0x13/0x30Call Trace: 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/0x30And 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 changeRoot cause is that commit 301867b1c168 ("md/raid10: checkslab-out-of-bounds in md_bitmap_get_counter") return early frommd_bitmap_get_counter(), without setting returned blocks.Fix this problem by always set returned blocks frommd_bitmap_get_counter"(), as it used to be.Noted that this patch just fix the softlockup problem in kernel, thecase that bitmap size doesn't match array size still need to be fixed.

POC

Reference

No PoCs from references.

Github

- https://github.com/ARPSyndicate/cve-scores