cve-2021-47066
Vulnerability from cvelistv5
Published
2024-02-29 22:37
Modified
2024-12-19 07:34
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: async_xor: increase src_offs when dropping destination page Now we support sharing one page if PAGE_SIZE is not equal stripe size. To support this, it needs to support calculating xor value with different offsets for each r5dev. One offset array is used to record those offsets. In RMW mode, parity page is used as a source page. It sets ASYNC_TX_XOR_DROP_DST before calculating xor value in ops_run_prexor5. So it needs to add src_list and src_offs at the same time. Now it only needs src_list. So the xor value which is calculated is wrong. It can cause data corruption problem. I can reproduce this problem 100% on a POWER8 machine. The steps are: mdadm -CR /dev/md0 -l5 -n3 /dev/sdb1 /dev/sdc1 /dev/sdd1 --size=3G mkfs.xfs /dev/md0 mount /dev/md0 /mnt/test mount: /mnt/test: mount(2) system call failed: Structure needs cleaning.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/29ffa50f33de824b5491f8239c88c4a0efdd03afPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/53f8208e11abd6dde9480dfcb97fecdb1bc2ac18Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cab2e8e5997b592fdb7d02cf2387b4b8e3057174Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ceaf2966ab082bbc4d26516f97b3ca8a676e2af8Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/29ffa50f33de824b5491f8239c88c4a0efdd03afPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/53f8208e11abd6dde9480dfcb97fecdb1bc2ac18Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/cab2e8e5997b592fdb7d02cf2387b4b8e3057174Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ceaf2966ab082bbc4d26516f97b3ca8a676e2af8Patch
Impacted products
Vendor Product Version
Linux Linux Version: 29bcff787a2593b2126cfaff612c0b4e560022e9
Version: 29bcff787a2593b2126cfaff612c0b4e560022e9
Version: 29bcff787a2593b2126cfaff612c0b4e560022e9
Version: 29bcff787a2593b2126cfaff612c0b4e560022e9
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   Linux Linux Version: 5.10
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