SRU Request submitted:
https://lists.ubuntu.com/archives/kernel-team/2018-August/095106.html
** Description changed:
+
+ == SRU Justification ==
+ Mainline commit 7dac4a1726a9 introduced a regression in v4.17-rc1, which
+ made it's way into Trusty via upstream stable updates. This regression
+ is resolved by mainline commit 22be37acce25. This commit has been cc'd
+ to upstream stable, but has not made it's way into Trusty as of yet.
+
+ == Fix ==
+ 22be37acce25 ("ext4: fix bitmap position validation")
+
+ == Regression Potential ==
+ Low. This commit has been cc'd to upstream stable, so it has had
+ additional upstream review.
+
+ == Test Case ==
+ A test kernel was built with this patch and tested by the original bug
reporter.
+ The bug reporter states the test kernel resolved the bug.
+
+
+
+
A customer reported on all of their ext3 and none of their ext4 systems
that the file system was in read-only mode, I believe after rebooting
into 3.13.0-157.207 from 3.13.0-156.206. Here is the output of tune2fs
-l for one of the file systems:
tune2fs 1.42.12 (29-Aug-2014)
Last mounted on: /
Filesystem UUID: 748f503a-443d-4769-8dd2-45ff46b48555
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: has_journal ext_attr resize_inode dir_index
filetype needs_recovery sparse_super large_file
Filesystem flags: signed_directory_hash
Default mount options: (none)
Filesystem state: clean with errors
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 1966080
Block count: 7863296
Reserved block count: 393164
Free blocks: 4568472
Free inodes: 1440187
First block: 0
Block size: 4096
Fragment size: 4096
Reserved GDT blocks: 1022
Blocks per group: 32768
Fragments per group: 32768
Inodes per group: 8192
Inode blocks per group: 512
RAID stride: 128
RAID stripe width: 512
Filesystem created: Thu Feb 25 21:54:24 2016
Last mount time: Fri Aug 24 07:40:51 2018
Last write time: Fri Aug 24 07:40:51 2018
Mount count: 1
Maximum mount count: 25
Last checked: Fri Aug 24 07:38:54 2018
Check interval: 15552000 (6 months)
Next check after: Wed Feb 20 07:38:54 2019
Lifetime writes: 7381 GB
Reserved blocks uid: 0 (user root)
Reserved blocks gid: 0 (group root)
First inode: 11
Inode size: 256
Required extra isize: 28
Desired extra isize: 28
Journal inode: 8
Default directory hash: half_md4
Directory Hash Seed: d6564a54-cd2a-4804-ad94-1e4e0e47933a
Journal backup: inode blocks
FS Error count: 210
First error time: Fri Aug 24 07:40:51 2018
First error function: ext4_validate_block_bitmap
First error line #: 376
First error inode #: 0
First error block #: 0
Last error time: Sun Aug 26 19:35:16 2018
Last error function: ext4_remount
Last error line #: 4833
Last error inode #: 0
Last error block #: 0
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https://bugs.launchpad.net/bugs/1789131
Title:
Probable regression with EXT3 file systems and CVE-2018-1093 patches
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