diff options
| author | Jeff Layton <jlayton@redhat.com> | 2014-03-10 16:34:55 +0100 |
|---|---|---|
| committer | J. Bruce Fields <bfields@redhat.com> | 2014-03-27 21:31:58 +0100 |
| commit | e874f9f8e04cb67351893894dfb9fbcd25e62fa2 (patch) | |
| tree | 88c14bec77d7b36f741dc88242003ce7b8055e88 /fs | |
| parent | net: Mark functions as static in net/sunrpc/svc_xprt.c (diff) | |
| download | linux-e874f9f8e04cb67351893894dfb9fbcd25e62fa2.tar.xz linux-e874f9f8e04cb67351893894dfb9fbcd25e62fa2.zip | |
svcrpc: explicitly reject compounds that are not padded out to 4-byte multiple
We have a WARN_ON in the nfsd4_decode_write() that tells us when the
client has sent a request that is not padded out properly according to
RFC4506. A WARN_ON really isn't appropriate in this case though since
this indicates a client bug, not a server one.
Move this check out to the top-level compound decoder and have it just
explicitly return an error. Also add a dprintk() that shows the client
address and xid to help track down clients and frames that trigger it.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/nfsd/nfs4xdr.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index aa04a6a98bd5..93b50ba1c5e9 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -1222,7 +1222,6 @@ nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write) } write->wr_head.iov_base = p; write->wr_head.iov_len = avail; - WARN_ON(avail != (XDR_QUADLEN(avail) << 2)); write->wr_pagelist = argp->pagelist; len = XDR_QUADLEN(write->wr_buflen) << 2; @@ -3696,6 +3695,12 @@ int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp) int nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args) { + if (rqstp->rq_arg.head[0].iov_len % 4) { + /* client is nuts */ + dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)", + __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid)); + return 0; + } args->p = p; args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len; args->pagelist = rqstp->rq_arg.pages; |