Updated:
Description:
In the Linux kernel, the following vulnerability has been resolved: ext4: fix corruption during on-line resize We observed a corruption during on-line resize of a file system that is larger than 16 TiB with 4k block size. With having more then 2^32 blocks resize_inode is turned off by default by mke2fs. The issue can be reproduced on a smaller file system for convenience by explicitly turning off resize_inode. An on-line resize across an 8 GiB boundary (the size of a meta block group in this setup) then leads to a corruption: dev=/dev/<some_dev> # should be >= 16 GiB mkdir -p /corruption /sbin/mke2fs -t ext4 -b 4096 -O ^resize_inode $dev $((2 * 2**21 - 2**15)) mount -t ext4 $dev /corruption dd if=/dev/zero bs=4096 of=/corruption/test count=$((2*2**21 - 4*2**15)) sha1sum /corruption/test # 79d2658b39dcfd77274e435b0934028adafaab11 /corruption/test /sbin/resize2fs $dev $((2*2**21)) # drop page cache to force reload the block from disk echo 1 > /proc/sys/vm/drop_caches sha1sum /corruption/test # 3c2abc63cbf1a94c9e6977e0fbd72cd832c4d5c3 /corruption/test 2^21 = 2^15*2^6 equals 8 GiB whereof 2^15 is the number of blocks per block group and 2^6 are the number of block groups that make a meta block group. The last checksum might be different depending on how the file is laid out across the physical blocks. The actual corruption occurs at physical block 63*2^15 = 2064384 which would be the location of the backup of the meta block group's block descriptor. During the on-line resize the file system will be converted to meta_bg starting at s_first_meta_bg which is 2 in the example - meaning all block groups after 16 GiB. However, in ext4_flex_group_add we might add block groups that are not part of the first meta block group yet. In the reproducer we achieved this by substracting the size of a whole block group from the point where the meta block group would start. This must be considered when updating the backup block group descriptors to follow the non-meta_bg layout. The fix is to add a test whether the group to add is already part of the meta block group or not.
CVSS3: 5.5
| OS | Vendor version | Errata |
|---|---|---|
| Amazon Linux 2 | 4.14.336-257.566.amzn2 | ALAS-2024-2633 |
| RHEL 8 | 4.18.0-553.16.1.el8_10 | RHSA-2024:5101 |
| Debian 10 | 4.19.316-1 | DLA-3840-1 |
| Oracle Linux 8 | 4.18.0-553.16.1.el8_10 | ELSA-2024-5101 |
| Debian 10 cloud | 4.19.316-1 | DLA-3840-1 |
| Ubuntu 20.04 | 5.4.0-189.209 | USN-6896-1 |
| Ubuntu 20.04 AWS | 5.4.0-1128.138 | USN-6896-5 |
| AlmaLinux 8 | 4.18.0-553.16.1.el8_10 | ALSA-2024:5101 |
| Ubuntu 20.04 Azure | 5.4.0-1133.140 | USN-6896-1 |
| Rocky Linux 8 | 4.18.0-553.16.1.el8_10 | RLSA-2024:5101 |
| Ubuntu 22.04 | 5.15.0-116.126 | USN-6898-1 |
| Ubuntu 22.04 AWS | 5.15.0-1065.71 | USN-6898-3 |
| Ubuntu 22.04 Azure | 5.15.0-1068.77 | USN-6917-1 |
| RHEL 9 | 5.14.0-503.11.1.el9_5 | RHSA-2024:9315 |
| Ubuntu 20.04 HWE Azure | 5.15.0-1068.77~20.04.1 | USN-6917-1 |
| Ubuntu 20.04 GCP | 5.4.0-1132.141 | USN-6896-1 |
| Amazon Linux 2 5.10 | 5.10.210-201.855.amzn2 | ALASKERNEL-5.10-2024-073 |
| Amazon Linux 2023 | 6.1.79-99.167.amzn2023 | ALAS-2024-715 |
| Ubuntu 24.04 | 6.8.0-35.35 | USN-6816-1 |
| OS | Original kernel version | State |
|---|---|---|
| Amazon Linux 2 |
4.14.121-109.96.amzn2
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4.14.106-97.85.amzn2
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4.14.336-255.557.amzn2
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4.14.336-256.557.amzn2
|
Released |
| RHEL 8 |
4.18.0-147.el8
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4.18.0-80.11.1.el8_0
4.18.0-80.4.2.el8_0
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4.18.0-477.10.1.el8_8
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4.18.0-553.el8_10
4.18.0-553.5.1.el8_10
4.18.0-553.8.1.el8_10
|
Released |
| Debian 10 | |
Planned |
| Oracle Linux 8 |
4.18.0-147.el8
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4.18.0-80.11.1.el8_0
4.18.0-80.4.2.el8_0
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|
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| CloudLinux OS 8 |
4.18.0-147.3.1.el8.lve.1
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4.18.0-147.8.1.el8.lve
4.18.0-147.0.3.lve.el8
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4.18.0-425.3.1.lve.3.el8
4.18.0-425.10.1.lve.el8
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4.18.0-477.10.1.lve.el8
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4.18.0-553.8.1.lve.el8
|
Released |
| CloudLinux OS 7h |
4.18.0-147.0.3.el7h.lve
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4.18.0-147.0.3.el7h
4.18.0-147.3.1.el7h.lve.1
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Released |
| Debian 10 cloud | |
Planned |
| Ubuntu 20.04 | |
In Progress |
| Ubuntu 20.04 AWS | |
Planned |
| AlmaLinux 8 |
4.18.0-240.el8
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4.18.0-240.15.1.el8_3
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4.18.0-477.10.1.el8_8
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4.18.0-477.15.1.el8_8
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4.18.0-513.5.1.el8_9
4.18.0-513.9.1.el8_9
4.18.0-477.27.2.el8_8
4.18.0-513.11.1.el8_9
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4.18.0-513.24.1.el8_9
4.18.0-513.18.2.el8_9
4.18.0-553.el8_10
4.18.0-553.5.1.el8_10
4.18.0-553.8.1.el8_10
|
Released |
| Ubuntu 20.04 Azure | |
In Progress |
| Rocky Linux 8 |
4.18.0-305.3.1.el8_4
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4.18.0-305.7.1.el8_4
4.18.0-305.10.2.el8_4
4.18.0-305.12.1.el8_4
4.18.0-305.17.1.el8_4
4.18.0-305.19.1.el8_4
4.18.0-305.25.1.el8_4
4.18.0-348.2.1.el8_5
4.18.0-348.12.2.el8_5
4.18.0-348.20.1.el8_5
4.18.0-348.7.1.el8_5
4.18.0-348.23.1.el8_5
4.18.0-372.9.1.el8
4.18.0-372.13.1.el8_6
4.18.0-372.19.1.el8_6
4.18.0-372.16.1.el8_6
4.18.0-372.16.1.el8_6.0.1
4.18.0-372.26.1.el8_6
4.18.0-372.32.1.el8_6
4.18.0-425.3.1.el8
4.18.0-425.10.1.el8_7
4.18.0-425.13.1.el8_7
4.18.0-425.19.2.el8_7
4.18.0-477.10.1.el8_8
4.18.0-477.13.1.el8_8
4.18.0-477.15.1.el8_8
4.18.0-477.27.1.el8_8
4.18.0-477.21.1.el8_8
4.18.0-513.5.1.el8_9
4.18.0-513.9.1.el8_9
4.18.0-513.11.1.el8_9
4.18.0-513.18.1.el8_9
4.18.0-513.11.1.el8_9.0.1
4.18.0-513.24.1.el8_9
4.18.0-553.el8_10
4.18.0-553.5.1.el8_10
4.18.0-553.8.1.el8_10
|
Released |
| Ubuntu 22.04 | |
Ready For Release |
| Ubuntu 22.04 AWS | |
Planned |
| Ubuntu 22.04 Azure | |
Planned |
| RHEL 9 | |
Planned |
| Ubuntu 20.04 HWE Azure | |
Planned |
| Ubuntu 20.04 GCP | |
In Progress |
| Amazon Linux 2 5.10 | |
Planned |
| Amazon Linux 2023 | |
Planned |
| Ubuntu 24.04 |
6.8.0-31.31
|
Released |