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| author | Chuck Lever <chuck.lever@oracle.com> | 2009-06-17 18:02:11 -0700 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2009-06-17 18:02:11 -0700 |
| commit | 29a1bd6bf8c7a9ff511aaaf7e40fd6ca5198babe (patch) | |
| tree | 03af95bef95d927742cd7a8349ae22c3320ff57c /fs/nfs | |
| parent | 2ad780978b7c0c3e7877949f098cbd06e7c73839 (diff) | |
| download | linux-29a1bd6bf8c7a9ff511aaaf7e40fd6ca5198babe.tar.gz linux-29a1bd6bf8c7a9ff511aaaf7e40fd6ca5198babe.tar.bz2 linux-29a1bd6bf8c7a9ff511aaaf7e40fd6ca5198babe.zip | |
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/nfs')
| -rw-r--r-- | fs/nfs/mount_clnt.c | 49 |
1 files changed, 44 insertions, 5 deletions
diff --git a/fs/nfs/mount_clnt.c b/fs/nfs/mount_clnt.c index af45a374d56f..93361afcd5da 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", |