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Index: usr.sbin/pw/pw_user.c
===================================================================
--- usr.sbin/pw/pw_user.c
+++ usr.sbin/pw/pw_user.c
@@ -641,6 +641,13 @@
/* Userids and groups can not have a leading '-'. */
if (*ch == '-')
reject = 1;
+ /*
+ * Reject the absurd user names "." and ".." to avoid
+ * bogus entries like (from "pw useraddd .."):
+ * ..:*:1002:1002:User &:/home/..:/bin/sh
+ */
+ if (strcmp(".", name) == 0 || strcmp("..", name) == 0)
+ errx(EX_DATAERR, "invalid user %s %s", showtype, name);
}
if (!reject) {
while (*ch) {

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