[Bug 3850] concurrent runs of ssh corrupts the known_hosts file

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3850

Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED
                 CC|                            |djm at mindrot.org

--- Comment #2 from Damien Miller <djm at mindrot.org> ---
FYI this was committed after openssh-10.0, which should help your case.
It will be in openssh-10.1, due in the next few months.

commit e048230106fb3f5e7cc07abc311c6feb5f52fd05
Author: djm at openbsd.org <djm at openbsd.org>
Date:   Wed Apr 30 05:26:15 2025 +0000

    upstream: make writing known_hosts lines more atomic, by writing

    the entire line in one operation and using unbuffered stdio.

    Usually writes to this file are serialised on the "Are you sure you
    want to continue connecting?" prompt, but if host key checking is
    disabled and connections were being made with high concurrency
    then interleaved writes might have been possible.

    feedback/ok deraadt@ millert@

    OpenBSD-Commit-ID: d11222b49dabe5cfe0937b49cb439ba3d4847b08

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