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| author | Chuck Lever <chuck.lever@oracle.com> | 2009-06-18 05:02:12 +0400 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2009-06-18 05:02:12 +0400 |
| commit | 4fdcd9966d8469be26a6f12122ac21ffce19fc20 (patch) | |
| tree | 569bdb9900053661ba59931cb49315c5de89a88b /fs/nfs/mount_clnt.c | |
| parent | fb12529577541aa02f9c3d9e325329f9568dfb58 (diff) | |
| download | linux-4fdcd9966d8469be26a6f12122ac21ffce19fc20.tar.xz | |
NFS: add new file handle decoders to in-kernel mountd client
Introduce xdr_stream-based XDR file handle decoders to the in-kernel
mountd client. These are more careful than the existing decoder
functions about buffer overflows and data type and range checking.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/mount_clnt.c')
| -rw-r--r-- | fs/nfs/mount_clnt.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/fs/nfs/mount_clnt.c b/fs/nfs/mount_clnt.c index 8429885bc729..dd8c6f448eaa 100644 --- a/fs/nfs/mount_clnt.c +++ b/fs/nfs/mount_clnt.c @@ -31,6 +31,8 @@ #define encode_dirpath_sz (1 + XDR_QUADLEN(MNTPATHLEN)) #define MNT_status_sz (1) #define MNT_fhs_status_sz (1) +#define MNT_fhandle_sz XDR_QUADLEN(NFS2_FHSIZE) +#define MNT_fhandle3_sz (1 + XDR_QUADLEN(NFS3_FHSIZE)) /* * XDR argument and result sizes @@ -272,6 +274,20 @@ static int decode_status(struct xdr_stream *xdr, struct mountres *res) return 0; } +static int decode_fhandle(struct xdr_stream *xdr, struct mountres *res) +{ + struct nfs_fh *fh = res->fh; + __be32 *p; + + p = xdr_inline_decode(xdr, NFS2_FHSIZE); + if (unlikely(p == NULL)) + return -EIO; + + fh->size = NFS2_FHSIZE; + memcpy(fh->data, p, NFS2_FHSIZE); + return 0; +} + static int decode_fhs_status(struct xdr_stream *xdr, struct mountres *res) { unsigned int i; @@ -295,6 +311,29 @@ static int decode_fhs_status(struct xdr_stream *xdr, struct mountres *res) return 0; } +static int decode_fhandle3(struct xdr_stream *xdr, struct mountres *res) +{ + struct nfs_fh *fh = res->fh; + u32 size; + __be32 *p; + + p = xdr_inline_decode(xdr, sizeof(size)); + if (unlikely(p == NULL)) + return -EIO; + + size = ntohl(*p++); + if (size > NFS3_FHSIZE || size == 0) + return -EIO; + + p = xdr_inline_decode(xdr, size); + if (unlikely(p == NULL)) + return -EIO; + + fh->size = size; + memcpy(fh->data, p, size); + return 0; +} + static int xdr_decode_fhstatus3(struct rpc_rqst *req, __be32 *p, struct mnt_fhstatus *res) { |