mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-23 19:14:30 +08:00
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 */
|
|
/*
|
|
* Encode/decode NLM basic data types
|
|
*
|
|
* Basic NLMv3 XDR data types are not defined in an IETF standards
|
|
* document. X/Open has a description of these data types that
|
|
* is useful. See Chapter 10 of "Protocols for Interworking:
|
|
* XNFS, Version 3W".
|
|
*
|
|
* Basic NLMv4 XDR data types are defined in Appendix II.1.4 of
|
|
* RFC 1813: "NFS Version 3 Protocol Specification".
|
|
*
|
|
* Author: Chuck Lever <chuck.lever@oracle.com>
|
|
*
|
|
* Copyright (c) 2020, Oracle and/or its affiliates.
|
|
*/
|
|
|
|
#ifndef _LOCKD_SVCXDR_H_
|
|
#define _LOCKD_SVCXDR_H_
|
|
|
|
static inline bool
|
|
svcxdr_decode_stats(struct xdr_stream *xdr, __be32 *status)
|
|
{
|
|
__be32 *p;
|
|
|
|
p = xdr_inline_decode(xdr, XDR_UNIT);
|
|
if (!p)
|
|
return false;
|
|
*status = *p;
|
|
|
|
return true;
|
|
}
|
|
|
|
static inline bool
|
|
svcxdr_encode_stats(struct xdr_stream *xdr, __be32 status)
|
|
{
|
|
__be32 *p;
|
|
|
|
p = xdr_reserve_space(xdr, XDR_UNIT);
|
|
if (!p)
|
|
return false;
|
|
*p = status;
|
|
|
|
return true;
|
|
}
|
|
|
|
static inline bool
|
|
svcxdr_decode_string(struct xdr_stream *xdr, char **data, unsigned int *data_len)
|
|
{
|
|
__be32 *p;
|
|
u32 len;
|
|
|
|
if (xdr_stream_decode_u32(xdr, &len) < 0)
|
|
return false;
|
|
if (len > NLM_MAXSTRLEN)
|
|
return false;
|
|
p = xdr_inline_decode(xdr, len);
|
|
if (!p)
|
|
return false;
|
|
*data_len = len;
|
|
*data = (char *)p;
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* NLM cookies are defined by specification to be a variable-length
|
|
* XDR opaque no longer than 1024 bytes. However, this implementation
|
|
* limits their length to 32 bytes, and treats zero-length cookies
|
|
* specially.
|
|
*/
|
|
static inline bool
|
|
svcxdr_decode_cookie(struct xdr_stream *xdr, struct nlm_cookie *cookie)
|
|
{
|
|
__be32 *p;
|
|
u32 len;
|
|
|
|
if (xdr_stream_decode_u32(xdr, &len) < 0)
|
|
return false;
|
|
if (len > NLM_MAXCOOKIELEN)
|
|
return false;
|
|
if (!len)
|
|
goto out_hpux;
|
|
|
|
p = xdr_inline_decode(xdr, len);
|
|
if (!p)
|
|
return false;
|
|
cookie->len = len;
|
|
memcpy(cookie->data, p, len);
|
|
|
|
return true;
|
|
|
|
/* apparently HPUX can return empty cookies */
|
|
out_hpux:
|
|
cookie->len = 4;
|
|
memset(cookie->data, 0, 4);
|
|
return true;
|
|
}
|
|
|
|
static inline bool
|
|
svcxdr_encode_cookie(struct xdr_stream *xdr, const struct nlm_cookie *cookie)
|
|
{
|
|
__be32 *p;
|
|
|
|
if (xdr_stream_encode_u32(xdr, cookie->len) < 0)
|
|
return false;
|
|
p = xdr_reserve_space(xdr, cookie->len);
|
|
if (!p)
|
|
return false;
|
|
memcpy(p, cookie->data, cookie->len);
|
|
|
|
return true;
|
|
}
|
|
|
|
static inline bool
|
|
svcxdr_decode_owner(struct xdr_stream *xdr, struct xdr_netobj *obj)
|
|
{
|
|
__be32 *p;
|
|
u32 len;
|
|
|
|
if (xdr_stream_decode_u32(xdr, &len) < 0)
|
|
return false;
|
|
if (len > XDR_MAX_NETOBJ)
|
|
return false;
|
|
p = xdr_inline_decode(xdr, len);
|
|
if (!p)
|
|
return false;
|
|
obj->len = len;
|
|
obj->data = (u8 *)p;
|
|
|
|
return true;
|
|
}
|
|
|
|
static inline bool
|
|
svcxdr_encode_owner(struct xdr_stream *xdr, const struct xdr_netobj *obj)
|
|
{
|
|
if (obj->len > XDR_MAX_NETOBJ)
|
|
return false;
|
|
return xdr_stream_encode_opaque(xdr, obj->data, obj->len) > 0;
|
|
}
|
|
|
|
#endif /* _LOCKD_SVCXDR_H_ */
|