1 files changed, 91 insertions, 4 deletions

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index b2883e9c6381..9272e1f806fc 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -51,6 +51,78 @@
 
 #define NFSDDBG_FACILITY                NFSDDBG_PROC
 
+static u32 nfsd_attrmask[] = {
+        NFSD_WRITEABLE_ATTRS_WORD0,
+        NFSD_WRITEABLE_ATTRS_WORD1,
+        NFSD_WRITEABLE_ATTRS_WORD2
+};
+
+static u32 nfsd41_ex_attrmask[] = {
+        NFSD_SUPPATTR_EXCLCREAT_WORD0,
+        NFSD_SUPPATTR_EXCLCREAT_WORD1,
+        NFSD_SUPPATTR_EXCLCREAT_WORD2
+};
+
+static __be32
+check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
+                   u32 *bmval, u32 *writable)
+{
+        struct dentry *dentry = cstate->current_fh.fh_dentry;
+        struct svc_export *exp = cstate->current_fh.fh_export;
+
+        /*
+         * Check about attributes are supported by the NFSv4 server or not.
+         * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
+         */
+        if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
+            (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
+            (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
+                return nfserr_attrnotsupp;
+
+        /*
+         * Check FATTR4_WORD0_ACL & FATTR4_WORD0_FS_LOCATIONS can be supported
+         * in current environment or not.
+         */
+        if (bmval[0] & FATTR4_WORD0_ACL) {
+                if (!IS_POSIXACL(dentry->d_inode))
+                        return nfserr_attrnotsupp;
+        }
+        if (bmval[0] & FATTR4_WORD0_FS_LOCATIONS) {
+                if (exp->ex_fslocs.locations == NULL)
+                        return nfserr_attrnotsupp;
+        }
+
+        /*
+         * According to spec, read-only attributes return ERR_INVAL.
+         */
+        if (writable) {
+                if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
+                    (bmval[2] & ~writable[2]))
+                        return nfserr_inval;
+        }
+
+        return nfs_ok;
+}
+
+static __be32
+nfsd4_check_open_attributes(struct svc_rqst *rqstp,
+        struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
+{
+        __be32 status = nfs_ok;
+
+        if (open->op_create == NFS4_OPEN_CREATE) {
+                if (open->op_createmode == NFS4_CREATE_UNCHECKED
+                    || open->op_createmode == NFS4_CREATE_GUARDED)
+                        status = check_attr_support(rqstp, cstate,
+                                        open->op_bmval, nfsd_attrmask);
+                else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
+                        status = check_attr_support(rqstp, cstate,
+                                        open->op_bmval, nfsd41_ex_attrmask);
+        }
+
+        return status;
+}
+
 static inline void
 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
 {
@@ -225,6 +297,10 @@ nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
         if (status)
                 goto out;
 
+        status = nfsd4_check_open_attributes(rqstp, cstate, open);
+        if (status)
+                goto out;
+
         /* Openowner is now set, so sequence id will get bumped.  Now we need
          * these checks before we do any creates: */
         status = nfserr_grace;
@@ -395,6 +471,11 @@ nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
         if (status)
                 return status;
 
+        status = check_attr_support(rqstp, cstate, create->cr_bmval,
+                                    nfsd_attrmask);
+        if (status)
+                return status;
+
         switch (create->cr_type) {
         case NF4LNK:
                 /* ugh! we have to null-terminate the linktext, or
@@ -689,6 +770,12 @@ nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
         if (status)
                 return status;
         status = nfs_ok;
+
+        status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
+                                    nfsd_attrmask);
+        if (status)
+                goto out;
+
         if (setattr->sa_acl != NULL)
                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
                                             setattr->sa_acl);
@@ -763,10 +850,10 @@ _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
         if (status)
                 return status;
 
-        if ((verify->ve_bmval[0] & ~nfsd_suppattrs0(cstate->minorversion))
-            || (verify->ve_bmval[1] & ~nfsd_suppattrs1(cstate->minorversion))
-            || (verify->ve_bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
-                return nfserr_attrnotsupp;
+        status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
+        if (status)
+                return status;
+
         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
                 return nfserr_inval;