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--- shadow-4.1.3/libmisc/chkname.c
+++ shadow-4.1.3/libmisc/chkname.c
@@ -66,6 +66,7 @@
( ('0' <= *name) && ('9' >= *name) ) ||
('_' == *name) ||
('-' == *name) ||
+ ('.' == *name) ||
( ('$' == *name) && ('\0' == *(name + 1)) )
)) {
return false;
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