CVE - CVE-2021-47114

CVE-ID
CVE-2021-47114	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: ocfs2: fix data corruption by fallocate When fallocate punches holes out of inode size, if original isize is in the middle of last cluster, then the part from isize to the end of the cluster will be zeroed with buffer write, at that time isize is not yet updated to match the new size, if writeback is kicked in, it will invoke ocfs2_writepage()->block_write_full_page() where the pages out of inode size will be dropped. That will cause file corruption. Fix this by zero out eof blocks when extending the inode size. Running the following command with qemu-image 4.2.1 can get a corrupted coverted image file easily. qemu-img convert -p -t none -T none -f qcow2 $qcow_image \ -O qcow2 -o compat=1.1 $qcow_image.conv The usage of fallocate in qemu is like this, it first punches holes out of inode size, then extend the inode size. fallocate(11, FALLOC_FL_KEEP_SIZE\|FALLOC_FL_PUNCH_HOLE, 2276196352, 65536) = 0 fallocate(11, 0, 2276196352, 65536) = 0 v1: https://www.spinics.net/lists/linux-fsdevel/msg193999.html v2: https://lore.kernel.org/linux-fsdevel/20210525093034.GB4112@quack2.suse.cz/T/
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/0a31dd6fd2f4e7db538fb6eb1f06973d81f8dd3b URL:https://git.kernel.org/stable/c/0a31dd6fd2f4e7db538fb6eb1f06973d81f8dd3b MISC:https://git.kernel.org/stable/c/33e03adafb29eedae1bae9cdb50c1385279fcf65 URL:https://git.kernel.org/stable/c/33e03adafb29eedae1bae9cdb50c1385279fcf65 MISC:https://git.kernel.org/stable/c/624fa7baa3788dc9e57840ba5b94bc22b03cda57 URL:https://git.kernel.org/stable/c/624fa7baa3788dc9e57840ba5b94bc22b03cda57 MISC:https://git.kernel.org/stable/c/6bba4471f0cc1296fe3c2089b9e52442d3074b2e URL:https://git.kernel.org/stable/c/6bba4471f0cc1296fe3c2089b9e52442d3074b2e MISC:https://git.kernel.org/stable/c/a1700479524bb9cb5e8ae720236a6fabd003acae URL:https://git.kernel.org/stable/c/a1700479524bb9cb5e8ae720236a6fabd003acae MISC:https://git.kernel.org/stable/c/c8d5faee46242c3f33b8a71a4d7d52214785bfcc URL:https://git.kernel.org/stable/c/c8d5faee46242c3f33b8a71a4d7d52214785bfcc MISC:https://git.kernel.org/stable/c/cc2edb99ea606a45182b5ea38cc8f4e583aa0774 URL:https://git.kernel.org/stable/c/cc2edb99ea606a45182b5ea38cc8f4e583aa0774 MISC:https://git.kernel.org/stable/c/cec4e857ffaa8c447f51cd8ab4e72350077b6770 URL:https://git.kernel.org/stable/c/cec4e857ffaa8c447f51cd8ab4e72350077b6770
Assigning CNA
kernel.org
Date Record Created
20240304	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 (20240304)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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