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When opening a temporary file without O_CLOEXEC we risk leaking the file descriptor if another thread calls (fork and then) exec while we have the fd open. Fix this by consistently passing O_CLOEXEC everywhere where we open a file for internal use (and not to return it to the user, in which case the API defines whether or not the close-on-exec flag shall be set on the returned fd). Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org> Signed-off-by: Sergey Bugaev <bugaevc@gmail.com> Message-Id: <20230419160207.65988-4-bugaevc@gmail.com>