Thanks for testing, Sarah. I'll submit an SRU request to have this
commit included in Trusty.
This regression was introduced by the following mainline commit:
7dac4a1726a9 ("ext4: add validity checks for bitmap block numbers")
This commit was added to mainline in version v4.17-rc1. However, the
regression it introduced was not fixed until v4.17-rc3. The regression
was fixed by commit 22be37acce25.
Commit 7dac4a1726a9 was added to Trusty in the 3.13.0-157 kernel, but
commit 22be37acce25 has not made it's way to Trusty via upstream stable
updates as of yet. The SRU request I send will get the fix into Trusty
without having to wait for the updates from upstream stable.
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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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