The current test plan doesn't seem to cover what is described in the
impact section.
Please update the test plan to include a test for the actual impact this
is having, which, from the description, is:
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),
It should be possible to come up with a test to reproduce the above
behavior, and confirm the fix.
** Changed in: zfs-linux (Ubuntu Noble)
Status: In Progress => Incomplete
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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:
Invalid
Status in linux-hwe-6.8 package in Ubuntu:
Invalid
Status in zfs-linux package in Ubuntu:
Fix Released
Status in linux source package in Noble:
Confirmed
Status in linux-hwe-6.8 source package in Noble:
Invalid
Status in zfs-linux source package in Noble:
Incomplete
Bug description:
SRU Justification
[Impact]
* 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.
[Fix]
* Include f0bf7a247dbb: "[PATCH] Linux 6.7 compat: zfs_setattr fix
atime update" from upstream ZFS as quilt patch.
[Test Case]
* Build tested against Noble generic
* Ran autopkgktests for regressions, none encountered
[Where things could go wrong]
* Low chance of regression, isolated instantiation and logic fix.
* Addition of time delta check could cause issues during unexpected delay > 2
seconds.
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