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NFS: Use xdr_stream-based XDR encoder for MNT's dirpath argument 

Check the length of the supplied dirpath, and see that it fits
properly in the RPC buffer.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever 2009-06-17 18:02:11 -07:00 committed by Trond Myklebust
parent 2ad780978b
commit 29a1bd6bf8
1 changed files with 44 additions and 5 deletions
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49
fs/nfs/mount_clnt.c
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@ -20,6 +20,21 @@
# define NFSDBG_FACILITY NFSDBG_MOUNT
#endif
/*
* Defined by RFC 1094, section A.3; and RFC 1813, section 5.1.4
*/
#define MNTPATHLEN (1024)
/*
* XDR data type sizes
*/
#define encode_dirpath_sz (1 + XDR_QUADLEN(MNTPATHLEN))
/*
* XDR argument and result sizes
*/
#define MNT_enc_dirpath_sz encode_dirpath_sz
/*
* Defined by RFC 1094, section A.5
*/
@ -135,6 +150,31 @@ static int xdr_encode_dirpath(struct rpc_rqst *req, __be32 *p,
return 0;
}
static int encode_mntdirpath(struct xdr_stream *xdr, const char *pathname)
{
const u32 pathname_len = strlen(pathname);
__be32 *p;
if (unlikely(pathname_len > MNTPATHLEN))
return -EIO;
p = xdr_reserve_space(xdr, sizeof(u32) + pathname_len);
if (unlikely(p == NULL))
return -EIO;
xdr_encode_opaque(p, pathname, pathname_len);
return 0;
}
static int mnt_enc_dirpath(struct rpc_rqst *req, __be32 *p,
const char *dirpath)
{
struct xdr_stream xdr;
xdr_init_encode(&xdr, &req->rq_snd_buf, p);
return encode_mntdirpath(&xdr, dirpath);
}
static int xdr_decode_fhstatus(struct rpc_rqst *req, __be32 *p,
struct mnt_fhstatus *res)
{
@ -164,16 +204,15 @@ static int xdr_decode_fhstatus3(struct rpc_rqst *req, __be32 *p,
return 0;
}
#define MNT_dirpath_sz (1 + 256)
#define MNT_fhstatus_sz (1 + 8)
#define MNT_fhstatus3_sz (1 + 16)
static struct rpc_procinfo mnt_procedures[] = {
[MOUNTPROC_MNT] = {
.p_proc = MOUNTPROC_MNT,
.p_encode = (kxdrproc_t) xdr_encode_dirpath,
.p_encode = (kxdrproc_t)mnt_enc_dirpath,
.p_decode = (kxdrproc_t) xdr_decode_fhstatus,
.p_arglen = MNT_dirpath_sz,
.p_arglen = MNT_enc_dirpath_sz,
.p_replen = MNT_fhstatus_sz,
.p_statidx = MOUNTPROC_MNT,
.p_name = "MOUNT",
@ -183,9 +222,9 @@ static struct rpc_procinfo mnt_procedures[] = {
static struct rpc_procinfo mnt3_procedures[] = {
[MOUNTPROC3_MNT] = {
.p_proc = MOUNTPROC3_MNT,
.p_encode = (kxdrproc_t) xdr_encode_dirpath,
.p_encode = (kxdrproc_t)mnt_enc_dirpath,
.p_decode = (kxdrproc_t) xdr_decode_fhstatus3,
.p_arglen = MNT_dirpath_sz,
.p_arglen = MNT_enc_dirpath_sz,
.p_replen = MNT_fhstatus3_sz,
.p_statidx = MOUNTPROC3_MNT,
.p_name = "MOUNT",