CVE - CVE-2021-47066

CVE-ID
CVE-2021-47066	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/29ffa50f33de824b5491f8239c88c4a0efdd03af URL:https://git.kernel.org/stable/c/29ffa50f33de824b5491f8239c88c4a0efdd03af MISC:https://git.kernel.org/stable/c/53f8208e11abd6dde9480dfcb97fecdb1bc2ac18 URL:https://git.kernel.org/stable/c/53f8208e11abd6dde9480dfcb97fecdb1bc2ac18 MISC:https://git.kernel.org/stable/c/cab2e8e5997b592fdb7d02cf2387b4b8e3057174 URL:https://git.kernel.org/stable/c/cab2e8e5997b592fdb7d02cf2387b4b8e3057174 MISC:https://git.kernel.org/stable/c/ceaf2966ab082bbc4d26516f97b3ca8a676e2af8 URL:https://git.kernel.org/stable/c/ceaf2966ab082bbc4d26516f97b3ca8a676e2af8
Assigning CNA
kernel.org
Date Record Created
20240229	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240229)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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