CVE-2022-49674 (GCVE-0-2022-49674)
Vulnerability from cvelistv5
Published
2025-02-26 02:24
Modified
2025-05-04 08:43
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
dm raid: fix accesses beyond end of raid member array
On dm-raid table load (using raid_ctr), dm-raid allocates an array
rs->devs[rs->raid_disks] for the raid device members. rs->raid_disks
is defined by the number of raid metadata and image tupples passed
into the target's constructor.
In the case of RAID layout changes being requested, that number can be
different from the current number of members for existing raid sets as
defined in their superblocks. Example RAID layout changes include:
- raid1 legs being added/removed
- raid4/5/6/10 number of stripes changed (stripe reshaping)
- takeover to higher raid level (e.g. raid5 -> raid6)
When accessing array members, rs->raid_disks must be used in control
loops instead of the potentially larger value in rs->md.raid_disks.
Otherwise it will cause memory access beyond the end of the rs->devs
array.
Fix this by changing code that is prone to out-of-bounds access.
Also fix validate_raid_redundancy() to validate all devices that are
added. Also, use braces to help clean up raid_iterate_devices().
The out-of-bounds memory accesses was discovered using KASAN.
This commit was verified to pass all LVM2 RAID tests (with KASAN
enabled).
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| ▼ | Linux | Linux |
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 |
||||||
|
|||||||||
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm raid: fix accesses beyond end of raid member array\n\nOn dm-raid table load (using raid_ctr), dm-raid allocates an array\nrs-\u003edevs[rs-\u003eraid_disks] for the raid device members. rs-\u003eraid_disks\nis defined by the number of raid metadata and image tupples passed\ninto the target\u0027s constructor.\n\nIn the case of RAID layout changes being requested, that number can be\ndifferent from the current number of members for existing raid sets as\ndefined in their superblocks. Example RAID layout changes include:\n- raid1 legs being added/removed\n- raid4/5/6/10 number of stripes changed (stripe reshaping)\n- takeover to higher raid level (e.g. raid5 -\u003e raid6)\n\nWhen accessing array members, rs-\u003eraid_disks must be used in control\nloops instead of the potentially larger value in rs-\u003emd.raid_disks.\nOtherwise it will cause memory access beyond the end of the rs-\u003edevs\narray.\n\nFix this by changing code that is prone to out-of-bounds access.\nAlso fix validate_raid_redundancy() to validate all devices that are\nadded. Also, use braces to help clean up raid_iterate_devices().\n\nThe out-of-bounds memory accesses was discovered using KASAN.\n\nThis commit was verified to pass all LVM2 RAID tests (with KASAN\nenabled)."
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