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-rw-r--r--nis/yp_xdr.c18
1 files changed, 13 insertions, 5 deletions
diff --git a/nis/yp_xdr.c b/nis/yp_xdr.c
index 418850643d..34566d19a8 100644
--- a/nis/yp_xdr.c
+++ b/nis/yp_xdr.c
@@ -32,6 +32,14 @@
#include <rpcsvc/yp.h>
#include <rpcsvc/ypclnt.h>
+/* The NIS v2 protocol suggests 1024 bytes as a maximum length of all fields.
+ Current Linux systems don't use this limit. To remain compatible with
+ recent Linux systems we choose limits large enough to load large key and
+ data values, but small enough to not pose a DoS threat. */
+
+#define XDRMAXNAME 1024
+#define XDRMAXRECORD (16 * 1024 * 1024)
+
bool_t
xdr_ypstat (XDR *xdrs, ypstat *objp)
{
@@ -49,21 +57,21 @@ libnsl_hidden_def (xdr_ypxfrstat)
bool_t
xdr_domainname (XDR *xdrs, domainname *objp)
{
- return xdr_string (xdrs, objp, YPMAXDOMAIN);
+ return xdr_string (xdrs, objp, XDRMAXNAME);
}
libnsl_hidden_def (xdr_domainname)
bool_t
xdr_mapname (XDR *xdrs, mapname *objp)
{
- return xdr_string (xdrs, objp, YPMAXMAP);
+ return xdr_string (xdrs, objp, XDRMAXNAME);
}
libnsl_hidden_def (xdr_mapname)
bool_t
xdr_peername (XDR *xdrs, peername *objp)
{
- return xdr_string (xdrs, objp, YPMAXPEER);
+ return xdr_string (xdrs, objp, XDRMAXNAME);
}
libnsl_hidden_def (xdr_peername)
@@ -71,7 +79,7 @@ bool_t
xdr_keydat (XDR *xdrs, keydat *objp)
{
return xdr_bytes (xdrs, (char **) &objp->keydat_val,
- (u_int *) &objp->keydat_len, YPMAXRECORD);
+ (u_int *) &objp->keydat_len, XDRMAXRECORD);
}
libnsl_hidden_def (xdr_keydat)
@@ -79,7 +87,7 @@ bool_t
xdr_valdat (XDR *xdrs, valdat *objp)
{
return xdr_bytes (xdrs, (char **) &objp->valdat_val,
- (u_int *) &objp->valdat_len, YPMAXRECORD);
+ (u_int *) &objp->valdat_len, XDRMAXRECORD);
}
libnsl_hidden_def (xdr_valdat)