[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

Konstantin Belousov <kib at FreeBSD.org> changed:

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                 CC|                            |kib at FreeBSD.org

--- Comment #8 from Konstantin Belousov <kib at FreeBSD.org> ---
(In reply to Ed Schouten from comment #7)
On FreeBSD, we guarantee that reader never see torn writes, assuming writer
always write single record using one atomic write(2) syscall, and similarly
reader uses single atomic read(2) syscall to get the record.

My guess is that if you get rid of stdio(3) use with its buffers, then you can
drop O_EXCLOCK and the issue disappears.

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