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NFSD: Add missing NFSv2 .pc_func methods

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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>
This commit is contained in:
Chuck Lever 2020-10-01 18:58:56 -04:00 committed by J. Bruce Fields
parent 13956160fc
commit 6b3dccd48d
1 changed files with 16 additions and 0 deletions
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16
fs/nfsd/nfsproc.c
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@ -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),