linuxptp Code

PTP IEEE 1588 stack for Linux

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Commit [2f963d] Maximize Restore History

uds: Don't call chmod() on client socket.

The pmc clients should not need to modify the permissions of their
socket (following the uds_file_mode setting), they can rely on their
umask.

Make the chmod() call on the bound socket only in the server.

This removes a race condition between the bind() and chmod() calls that
could potentially be exploited by ptp4l running under a non-root user.
It could replace the socket with a symlink in order to make the client
running under root to change the mode of a different file.

Signed-off-by: Miroslav Lichvar <mlichvar@...>
Reviewed-by: Jacob Keller <jacob.e.keller@...>

Authored by: Miroslav Lichvar (via linuxptp-devel Mailing List) 2025-07-31