CVE-2022-50084 Information

Jun 19, 2025 cve

Description

In the Linux kernel the following vulnerability has been resolved:

dm raid: fix address sanitizer warning in raid_status

There is this warning when using a kernel with the address sanitizer and running this testsuite: https://gitlab.com/cki-project/kernel-tests/-/tree/main/storage/swraid/scsi_raid

================================================================== BUG: KASAN: slab-out-of-bounds in raid_status+0x1747/0x2820 [dm_raid] Read of size 4 at addr ffff888079d2c7e8 by task lvcreate/13319 CPU: 0 PID: 13319 Comm: lvcreate Not tainted 5.18.0-0.rc3. 1 Hardware name: Red Hat KVM BIOS 0.5.1 01/01/2011 Call Trace: dump_stack_lvl+0x6a/0x9c print_address_description.constprop.0+0x1f/0x1e0 print_report.cold+0x55/0x244 kasan_report+0xc9/0x100 raid_status+0x1747/0x2820 [dm_raid] dm_ima_measure_on_table_load+0x4b8/0xca0 [dm_mod] table_load+0x35c/0x630 [dm_mod] ctl_ioctl+0x411/0x630 [dm_mod] dm_ctl_ioctl+0xa/0x10 [dm_mod] __x64_sys_ioctl+0x12a/0x1a0 do_syscall_64+0x5b/0x80

The warning is caused by reading conf->max_nr_stripes in raid_status. The code in raid_status reads mddev->private casts it to struct r5conf and reads the entry max_nr_stripes.

However if we have different raid type than 4/5/6 mddev->private doesn’t point to struct r5conf; it may point to struct r0conf struct r1conf struct r10conf or struct mpconf. If we cast a pointer to one of these structs to struct r5conf we will be reading invalid memory and KASAN warns about it.

Fix this bug by reading struct r5conf only if raid type is 4 5 or 6.

Reference

https://git.kernel.org/stable/c/1ae0ebfb576b72c2ef400917a5484ebe7892d80b https://git.kernel.org/stable/c/1fbeea217d8f297fe0e0956a1516d14ba97d0396 https://git.kernel.org/stable/c/49dba30638e091120256a9e89125340795f034dc https://git.kernel.org/stable/c/4c233811a49578634d10a5e70a9dfa569d451e94 https://git.kernel.org/stable/c/90b006da40dd42285b24dd3c940d2c32aca9a70b https://git.kernel.org/stable/c/b4c6c07c92b6cba2bf3cb2dfa722debeaf8a8abe https://git.kernel.org/stable/c/b856ce5f4b55f752144baf17e9d5c415072652c5 https://git.kernel.org/stable/c/cb583ca6125ac64c98e9d65128e95ebb5be7d322 https://git.kernel.org/stable/c/d8971b595d7adac3421c21f59918241f1574061e

CNNVD-202506-2368 (Published: 2025-06-18)

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