SUSE specific patch that hardens the auth_pam_tool setuid-root binary.
Matthias Gerstner wants it as a prerequisite for allowing auth_pam_tool
setuid-root binary in [bsc#1160285].

Index: mariadb-10.4.12/plugin/auth_pam/auth_pam_base.c
===================================================================
--- mariadb-10.4.12.orig/plugin/auth_pam/auth_pam_base.c
+++ mariadb-10.4.12/plugin/auth_pam/auth_pam_base.c
@@ -149,6 +149,12 @@ static int pam_auth_base(struct param *p
   const char *service = info->auth_string && info->auth_string[0]
                           ? info->auth_string : "mysql";
 
+  if( strcmp(service, "mysql") != 0 )
+  {
+	  PAM_DEBUG((stderr, "PAM: rejecting non-standard PAM service %s\n", service));
+	  return CR_ERROR;
+  }
+
   param->ptr = param->buf + 1;
 
   PAM_DEBUG((stderr, "PAM: pam_start(%s, %s)\n", service, info->user_name));