diff options
| author | J. Bruce Fields <bfields@redhat.com> | 2015-04-03 17:19:41 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-05-06 22:04:05 +0200 |
| commit | e2efc21fbad9a8d055586716fad4d4baaf210b56 (patch) | |
| tree | c6a01d66258262cbc29185267f17da7043a877cc /fs | |
| parent | 2556cb4a63a559a09112aba49d0112bd7dc4d2d6 (diff) | |
nfsd4: fix READ permission checking
commit 6e4891dc289cd191d46ab7ba1dcb29646644f9ca upstream.
In the case we already have a struct file (derived from a stateid), we
still need to do permission-checking; otherwise an unauthorized user
could gain access to a file by sniffing or guessing somebody else's
stateid.
Fixes: dc97618ddda9 "nfsd4: separate splice and readv cases"
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/nfsd/nfs4xdr.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index 5fb7e78169a6..5b33ce1db616 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -3422,6 +3422,7 @@ nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr, unsigned long maxcount; struct xdr_stream *xdr = &resp->xdr; struct file *file = read->rd_filp; + struct svc_fh *fhp = read->rd_fhp; int starting_len = xdr->buf->len; struct raparms *ra; __be32 *p; @@ -3445,12 +3446,15 @@ nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr, maxcount = min_t(unsigned long, maxcount, (xdr->buf->buflen - xdr->buf->len)); maxcount = min_t(unsigned long, maxcount, read->rd_length); - if (!read->rd_filp) { + if (read->rd_filp) + err = nfsd_permission(resp->rqstp, fhp->fh_export, + fhp->fh_dentry, + NFSD_MAY_READ|NFSD_MAY_OWNER_OVERRIDE); + else err = nfsd_get_tmp_read_open(resp->rqstp, read->rd_fhp, &file, &ra); - if (err) - goto err_truncate; - } + if (err) + goto err_truncate; if (file->f_op->splice_read && test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) err = nfsd4_encode_splice_read(resp, read, file, maxcount); |