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diff -up yp-tools-2.12/src/yppasswd.c.adjunct yp-tools-2.12/src/yppasswd.c
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--- yp-tools-2.12/src/yppasswd.c.adjunct	2012-04-23 13:17:47.000988833 +0200
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+++ yp-tools-2.12/src/yppasswd.c	2012-04-23 13:18:01.209802938 +0200
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@@ -774,6 +775,7 @@
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       /* We can't check the password with shadow passwords enabled. We
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        * leave the checking to yppasswdd */
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       if (uid != 0 && strcmp (pwd->pw_passwd, "x") != 0 &&
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+	  0 != strncmp (pwd->pw_passwd, "##", 2) && /* don't check passwords using passwd.adjunct feature */
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 	  strcmp (pwd->pw_passwd, hashpass ) != 0)
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 	{
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 	  int passwdlen = get_passwd_len (pwd->pw_passwd);