Public bug reported:
I have a security script that relies on the `wtmpdb last` command
displaying consistent results. However, the `--until` option behaves
erratically.
When I run the _same_ `wtmpdb last --until <some_time>` command several
times, I get different results. This is a sample output:
# wtmpdb last --until "2024-11-17 21:13:14" | head -4
guest ssh 127.0.0.1 Sun Nov 17 20:47 - 20:47 (00:00)
root pts/1 Sun Nov 17 20:15 - still logged in
root pts/0 Sun Nov 17 19:49 - 20:01 (00:11)
fedon tty2 Sun Nov 17 19:49 - still logged in
# wtmpdb last --until "2024-11-17 21:13:14" | head -4
root pts/0 Sun Nov 17 19:49 - 20:01 (00:11)
fedon tty2 Sun Nov 17 19:49 - still logged in
gdm tty1 Sun Nov 17 19:49 - 19:49 (00:00)
reboot system boot 6.11.0-9-generic Sun Nov 17 19:49 - still running
# date
Sun 17 Nov 21:32:50 +03 2024
# wtmpdb --version
wtmpdb 0.13.0
As you see, the first invocation correctly displays logins from `guest` and
`root` happened sometime between 20:00 and 21:00, while the second invocation
misses these two!
Which output I get when I run the same command seems to be completely
random.
You may think that the second line with `root` "still logged in" causes
a confusion. However, even when I log out from `root`, the same erratic
behavior continues.
---
Ubuntu version 24.10
# apt-cache policy wtmpdb
wtmpdb:
Installed: 0.13.0-1
Candidate: 0.13.0-1
Version table:
*** 0.13.0-1 500
500 http://us.archive.ubuntu.com/ubuntu oracular/universe amd64 Packages
100 /var/lib/dpkg/status
** Affects: wtmpdb (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2088387
Title:
`wtmpdb last --until` commands print inconsistent results in separate
invocations
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