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get_socket() opens a socket, then uses fcntl() to set CLOEXEC. This is racy with exec(). Open the socket with SOCK_CLOEXEC. Use the same compatibility strategy as O_CLOEXEC on ancient versions of Linux. Reported-by: Frediano Ziglio <frediano.ziglio@cloud.com> Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Juergen Gross <jgross@suse.com> Acked-by: Anthony PERARD <anthony.perard@vates.tech>