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89c485c7a3
Dai Ngo reports that, since the XDR overhaul, the NLM server crashes
when the TEST procedure wants to return NLM_DENIED. There is a bug
in svcxdr_encode_owner() that none of our standard test cases found.
Replace the open-coded function with a call to an appropriate
pre-fabricated XDR helper.
Reported-by: Dai Ngo <Dai.Ngo@oracle.com>
Fixes: a6a63ca565 ("lockd: Common NLM XDR helpers")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
143 lines
2.8 KiB
C
143 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Encode/decode NLM basic data types
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*
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* Basic NLMv3 XDR data types are not defined in an IETF standards
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* document. X/Open has a description of these data types that
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* is useful. See Chapter 10 of "Protocols for Interworking:
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* XNFS, Version 3W".
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*
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* Basic NLMv4 XDR data types are defined in Appendix II.1.4 of
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* RFC 1813: "NFS Version 3 Protocol Specification".
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*
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* Author: Chuck Lever <chuck.lever@oracle.com>
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*
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* Copyright (c) 2020, Oracle and/or its affiliates.
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*/
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#ifndef _LOCKD_SVCXDR_H_
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#define _LOCKD_SVCXDR_H_
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static inline bool
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svcxdr_decode_stats(struct xdr_stream *xdr, __be32 *status)
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{
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__be32 *p;
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p = xdr_inline_decode(xdr, XDR_UNIT);
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if (!p)
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return false;
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*status = *p;
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return true;
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}
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static inline bool
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svcxdr_encode_stats(struct xdr_stream *xdr, __be32 status)
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{
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__be32 *p;
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p = xdr_reserve_space(xdr, XDR_UNIT);
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if (!p)
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return false;
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*p = status;
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return true;
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}
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static inline bool
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svcxdr_decode_string(struct xdr_stream *xdr, char **data, unsigned int *data_len)
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{
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__be32 *p;
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u32 len;
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if (xdr_stream_decode_u32(xdr, &len) < 0)
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return false;
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if (len > NLM_MAXSTRLEN)
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return false;
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p = xdr_inline_decode(xdr, len);
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if (!p)
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return false;
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*data_len = len;
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*data = (char *)p;
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return true;
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}
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/*
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* NLM cookies are defined by specification to be a variable-length
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* XDR opaque no longer than 1024 bytes. However, this implementation
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* limits their length to 32 bytes, and treats zero-length cookies
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* specially.
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*/
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static inline bool
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svcxdr_decode_cookie(struct xdr_stream *xdr, struct nlm_cookie *cookie)
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{
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__be32 *p;
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u32 len;
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if (xdr_stream_decode_u32(xdr, &len) < 0)
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return false;
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if (len > NLM_MAXCOOKIELEN)
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return false;
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if (!len)
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goto out_hpux;
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p = xdr_inline_decode(xdr, len);
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if (!p)
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return false;
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cookie->len = len;
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memcpy(cookie->data, p, len);
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return true;
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/* apparently HPUX can return empty cookies */
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out_hpux:
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cookie->len = 4;
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memset(cookie->data, 0, 4);
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return true;
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}
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static inline bool
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svcxdr_encode_cookie(struct xdr_stream *xdr, const struct nlm_cookie *cookie)
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{
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__be32 *p;
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if (xdr_stream_encode_u32(xdr, cookie->len) < 0)
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return false;
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p = xdr_reserve_space(xdr, cookie->len);
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if (!p)
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return false;
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memcpy(p, cookie->data, cookie->len);
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return true;
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}
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static inline bool
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svcxdr_decode_owner(struct xdr_stream *xdr, struct xdr_netobj *obj)
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{
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__be32 *p;
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u32 len;
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if (xdr_stream_decode_u32(xdr, &len) < 0)
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return false;
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if (len > XDR_MAX_NETOBJ)
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return false;
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p = xdr_inline_decode(xdr, len);
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if (!p)
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return false;
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obj->len = len;
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obj->data = (u8 *)p;
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return true;
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}
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static inline bool
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svcxdr_encode_owner(struct xdr_stream *xdr, const struct xdr_netobj *obj)
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{
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if (obj->len > XDR_MAX_NETOBJ)
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return false;
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return xdr_stream_encode_opaque(xdr, obj->data, obj->len) > 0;
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}
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#endif /* _LOCKD_SVCXDR_H_ */
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