Improper Input Validation Affecting kernel-rt package, versions *
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Test your applications- Snyk ID SNYK-RHEL7-KERNELRT-6455998
- published 17 Mar 2024
- disclosed 15 Mar 2024
Introduced: 15 Mar 2024
CVE-2021-47114 Open this link in a new tabHow to fix?
There is no fixed version for RHEL:7 kernel-rt.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt package and not the kernel-rt package as distributed by RHEL.
See How to fix? for RHEL:7 relevant fixed versions and status.
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
- https://access.redhat.com/security/cve/CVE-2021-47114
- https://git.kernel.org/stable/c/0a31dd6fd2f4e7db538fb6eb1f06973d81f8dd3b
- https://git.kernel.org/stable/c/33e03adafb29eedae1bae9cdb50c1385279fcf65
- https://git.kernel.org/stable/c/624fa7baa3788dc9e57840ba5b94bc22b03cda57
- https://git.kernel.org/stable/c/6bba4471f0cc1296fe3c2089b9e52442d3074b2e
- https://git.kernel.org/stable/c/a1700479524bb9cb5e8ae720236a6fabd003acae
- https://git.kernel.org/stable/c/c8d5faee46242c3f33b8a71a4d7d52214785bfcc
- https://git.kernel.org/stable/c/cc2edb99ea606a45182b5ea38cc8f4e583aa0774
- https://git.kernel.org/stable/c/cec4e857ffaa8c447f51cd8ab4e72350077b6770