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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>
This commit is contained in:
Chuck Lever 2009-06-17 18:02:12 -07:00 committed by Trond Myklebust
parent fb12529577
commit 4fdcd9966d
1 changed files with 39 additions and 0 deletions
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39
fs/nfs/mount_clnt.c
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@ -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)
{