From https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=762465

--- a/plugins/sudoers/boottime.c
+++ b/plugins/sudoers/boottime.c
@@ -80,6 +80,8 @@
     if (fp != NULL) {
 	while ((len = getline(&line, &linesize, fp)) != -1) {
 	    if (strncmp(line, "btime ", 6) == 0) {
+		if (line[len - 1] == '\n')
+		    line[len - 1] = '\0';
 		long long llval = strtonum(line + 6, 1, LLONG_MAX, NULL);
 		if (llval > 0) {
 		    tv->tv_sec = (time_t)llval;