NFSv4: Sanity check the server reply in _nfs4_server_capabilities

We don't want to be setting capabilities and/or requesting attributes
that are not appropriate for the NFSv4 minor version.

- Ensure that we clear the NFS_CAP_SECURITY_LABEL capability when appropriate
- Ensure that we limit the attribute bitmasks to the mounted_on_fileid
  attribute and less for NFSv4.0
- Ensure that we limit the attribute bitmasks to suppattr_exclcreat and
  less for NFSv4.1
- Ensure that we limit it to change_sec_label or less for NFSv4.2

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 20 insertions, 5 deletions

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 7e28b5c77cbc..ed2a0e6b9aed 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2706,6 +2706,10 @@ static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
                 nfs4_close_state(ctx->state, ctx->mode);
 }
 
+#define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
+#define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
+#define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_CHANGE_SECURITY_LABEL - 1UL)
+
 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
 {
         struct nfs4_server_caps_arg args = {
@@ -2721,12 +2725,25 @@ static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *f
 
         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
         if (status == 0) {
+                /* Sanity check the server answers */
+                switch (server->nfs_client->cl_minorversion) {
+                case 0:
+                        res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
+                        res.attr_bitmask[2] = 0;
+                        break;
+                case 1:
+                        res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
+                        break;
+                case 2:
+                        res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
+                }
                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
-                                NFS_CAP_CTIME|NFS_CAP_MTIME);
+                                NFS_CAP_CTIME|NFS_CAP_MTIME|
+                                NFS_CAP_SECURITY_LABEL);
                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
                         server->caps |= NFS_CAP_ACLS;
                 if (res.has_links != 0)
@@ -2755,14 +2772,12 @@ static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *f
 #endif
                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
                                 sizeof(server->attr_bitmask));
+                server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
 
-                if (server->caps & NFS_CAP_SECURITY_LABEL) {
-                        server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
-                        res.attr_bitmask[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
-                }
                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
+                server->cache_consistency_bitmask[2] = 0;
                 server->acl_bitmask = res.acl_bitmask;
                 server->fh_expire_type = res.fh_expire_type;
         }