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| author | Chuck Lever <chuck.lever@oracle.com> | 2020-10-01 18:58:56 -0400 |
|---|---|---|
| committer | J. Bruce Fields <bfields@redhat.com> | 2020-10-02 09:37:41 -0400 |
| commit | 6b3dccd48de8a4c650b01499a0b09d1e2279649e (patch) | |
| tree | 3bcdd92076c06f12633bf35bf9bbafe2e12229c2 /fs/nfsd | |
| parent | 13956160fc7c75706178cb05c0ac9f5ca77c6411 (diff) | |
| download | linux-6b3dccd48de8a4c650b01499a0b09d1e2279649e.tar.gz | |
NFSD: Add missing NFSv2 .pc_func methods
There's no protection in nfsd_dispatch() against a NULL .pc_func helpers. A malicious NFS client can trigger a crash by invoking the unused/unsupported NFSv2 ROOT or WRITECACHE procedures. The current NFSD dispatcher does not support returning a void reply to a non-NULL procedure, so the reply to both of these is wrong, for the moment. Cc: <stable@vger.kernel.org> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd')
| -rw-r--r-- | fs/nfsd/nfsproc.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/fs/nfsd/nfsproc.c b/fs/nfsd/nfsproc.c index 6e0b066480c5..6d1b3af40a4f 100644 --- a/fs/nfsd/nfsproc.c +++ b/fs/nfsd/nfsproc.c @@ -118,6 +118,13 @@ done: return nfsd_return_attrs(nfserr, resp); } +/* Obsolete, replaced by MNTPROC_MNT. */ +static __be32 +nfsd_proc_root(struct svc_rqst *rqstp) +{ + return nfs_ok; +} + /* * Look up a path name component * Note: the dentry in the resp->fh may be negative if the file @@ -203,6 +210,13 @@ nfsd_proc_read(struct svc_rqst *rqstp) return fh_getattr(&resp->fh, &resp->stat); } +/* Reserved */ +static __be32 +nfsd_proc_writecache(struct svc_rqst *rqstp) +{ + return nfs_ok; +} + /* * Write data to a file * N.B. After this call resp->fh needs an fh_put @@ -617,6 +631,7 @@ static const struct svc_procedure nfsd_procedures2[18] = { .pc_xdrressize = ST+AT, }, [NFSPROC_ROOT] = { + .pc_func = nfsd_proc_root, .pc_decode = nfssvc_decode_void, .pc_encode = nfssvc_encode_void, .pc_argsize = sizeof(struct nfsd_void), @@ -654,6 +669,7 @@ static const struct svc_procedure nfsd_procedures2[18] = { .pc_xdrressize = ST+AT+1+NFSSVC_MAXBLKSIZE_V2/4, }, [NFSPROC_WRITECACHE] = { + .pc_func = nfsd_proc_writecache, .pc_decode = nfssvc_decode_void, .pc_encode = nfssvc_encode_void, .pc_argsize = sizeof(struct nfsd_void), |