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authorChuck Lever <chuck.lever@oracle.com>2009-06-18 01:02:11 (GMT)
committerTrond Myklebust <Trond.Myklebust@netapp.com>2009-06-18 01:02:11 (GMT)
commit29a1bd6bf8c7a9ff511aaaf7e40fd6ca5198babe (patch)
tree03af95bef95d927742cd7a8349ae22c3320ff57c /fs
parent2ad780978b7c0c3e7877949f098cbd06e7c73839 (diff)
downloadlinux-29a1bd6bf8c7a9ff511aaaf7e40fd6ca5198babe.tar.xz
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>
Diffstat (limited to 'fs')
-rw-r--r--fs/nfs/mount_clnt.c49
1 files changed, 44 insertions, 5 deletions
diff --git a/fs/nfs/mount_clnt.c b/fs/nfs/mount_clnt.c
index af45a37..93361af 100644
--- a/fs/nfs/mount_clnt.c
+++ b/fs/nfs/mount_clnt.c
@@ -21,6 +21,21 @@
#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
*/
enum {
@@ -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",