[Bug 233578] Unprivileged local user can prevent other users logging in by locking utx.active

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233578

--- Comment #4 from Ed Schouten <ed at FreeBSD.org> ---
Hi there,

Instead of going down this road, what are your thoughts on the following?

- Tossing out the use of O_EXLOCK entirely and leave the file writing as it is
now,
- Using a single lock file acquisition in pututxline() to serialise write
access all data files in one go.

This likely makes the code a bit simpler/lighter, while also improving the
sequential consistency guarantees between the data files.

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