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libauth: fix authrpc buffer overflow (import from sources)

--- a/sys/include/auth.h

+++ b/sys/include/auth.h

@@ -35,7 +35,7 @@

 struct AuthRpc

 {

 	int afd;

-	char ibuf[AuthRpcMax];

+	char ibuf[AuthRpcMax+1];	/* +1 for NUL in auth_rpc.c */

 	char obuf[AuthRpcMax];

 	char *arg;

 	uint narg;