NB: Given the 22.04 HWE kernel is pulling from 24.04, this also affects
24.04 out of the box, as expected, no HWE kernel required to hit it.
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2077487
Title:
Broken atime in 2.2.2-0ubuntu9 (noble's version)
Status in linux package in Ubuntu:
New
Status in linux-hwe-6.8 package in Ubuntu:
New
Status in zfs-linux package in Ubuntu:
New
Bug description:
2.2.2-0ubuntu9 has the 6.7 compat series, including
https://github.com/openzfs/zfs/commit/db4fc559cc1931b9219e62aa505cd5c51a17b232,
but does not include the fix for that commit (affects both pre-6.7 and
post-6.7),
https://github.com/openzfs/zfs/commit/f0bf7a247dbb030d68c7fd2b5526dd111cc775d0.
This manifests for me on the current (6.8.0-40.40~22.04.3) 22.04 HWE kernel as
writes to a file resetting atime back to 0 (reads still seem to work as
expected though given that state), which of course breaks real-world things (in
my case, I can no longer successfully run LLVM's test suite).
Thanks to CONFIG_INIT_STACK_ALL_ZERO=y being the default it seems like
this isn't a kernel memory disclosure and is instead a deterministic
use of 0, so I don't believe this to be a blatant security
vulnerability. This also explains the behaviour observed above.
This needs fixing in noble, and then propagating back through whatever
kernels are pulling in this version, since linux-modules vendors
copies of the pre-built DKMS modules, with the current 6.8 HWE kernel
using 2.2.2-0ubuntu9 explicitly.
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