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2023-12-11 1f93a7dfd1f8d5ff7a5c53246c7534fe2332d6f4

 kernel/fs/nfsd/nfsxdr.c
..
..
@@ -71,7 +71,7 @@
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 }
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 static __be32 *
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-decode_sattr(__be32 *p, struct iattr *iap)
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+decode_sattr(__be32 *p, struct iattr *iap, struct user_namespace *userns)
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 {
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 	u32	tmp, tmp1;
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@@ -86,12 +86,12 @@
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 		iap->ia_mode = tmp;
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 	}
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 	if ((tmp = ntohl(*p++)) != (u32)-1) {
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-		iap->ia_uid = make_kuid(&init_user_ns, tmp);
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+		iap->ia_uid = make_kuid(userns, tmp);
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 		if (uid_valid(iap->ia_uid))
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 			iap->ia_valid |= ATTR_UID;
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 	}
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 	if ((tmp = ntohl(*p++)) != (u32)-1) {
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-		iap->ia_gid = make_kgid(&init_user_ns, tmp);
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+		iap->ia_gid = make_kgid(userns, tmp);
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 		if (gid_valid(iap->ia_gid))
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 			iap->ia_valid |= ATTR_GID;
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 	}
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@@ -129,6 +129,7 @@
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 encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
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 	     struct kstat *stat)
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 {
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+	struct user_namespace *userns = nfsd_user_namespace(rqstp);
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 	struct dentry	*dentry = fhp->fh_dentry;
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 	int type;
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 	struct timespec64 time;
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@@ -139,8 +140,8 @@
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 	*p++ = htonl(nfs_ftypes[type >> 12]);
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 	*p++ = htonl((u32) stat->mode);
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 	*p++ = htonl((u32) stat->nlink);
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-	*p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
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-	*p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid));
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+	*p++ = htonl((u32) from_kuid_munged(userns, stat->uid));
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+	*p++ = htonl((u32) from_kgid_munged(userns, stat->gid));
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 	if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN) {
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 		*p++ = htonl(NFS_MAXPATHLEN);
..
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@@ -216,7 +217,7 @@
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 	p = decode_fh(p, &args->fh);
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 	if (!p)
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 		return 0;
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-	p = decode_sattr(p, &args->attrs);
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+	p = decode_sattr(p, &args->attrs, nfsd_user_namespace(rqstp));
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 	return xdr_argsize_check(rqstp, p);
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 }
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@@ -319,7 +320,7 @@
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 	if (   !(p = decode_fh(p, &args->fh))
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 	    || !(p = decode_filename(p, &args->name, &args->len)))
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 		return 0;
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-	p = decode_sattr(p, &args->attrs);
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+	p = decode_sattr(p, &args->attrs, nfsd_user_namespace(rqstp));
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 	return xdr_argsize_check(rqstp, p);
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 }
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@@ -398,7 +399,7 @@
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 			return 0;
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 		p += xdrlen;
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 	}
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-	decode_sattr(p, &args->attrs);
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+	decode_sattr(p, &args->attrs, nfsd_user_namespace(rqstp));
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 	return 1;
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 }
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@@ -429,11 +430,24 @@
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 }
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431
 
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 int
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+nfssvc_encode_stat(struct svc_rqst *rqstp, __be32 *p)
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+{
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+	struct nfsd_stat *resp = rqstp->rq_resp;
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+
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+	*p++ = resp->status;
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+	return xdr_ressize_check(rqstp, p);
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+}
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+
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+int
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 nfssvc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p)
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 {
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 	struct nfsd_attrstat *resp = rqstp->rq_resp;
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+	*p++ = resp->status;
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+	if (resp->status != nfs_ok)
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+		goto out;
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 	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
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+out:
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 	return xdr_ressize_check(rqstp, p);
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 }
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@@ -442,8 +456,12 @@
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 {
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 	struct nfsd_diropres *resp = rqstp->rq_resp;
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+	*p++ = resp->status;
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+	if (resp->status != nfs_ok)
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+		goto out;
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 	p = encode_fh(p, &resp->fh);
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 	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
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+out:
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 	return xdr_ressize_check(rqstp, p);
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 }
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@@ -451,6 +469,10 @@
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 nfssvc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p)
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 {
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 	struct nfsd_readlinkres *resp = rqstp->rq_resp;
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+
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+	*p++ = resp->status;
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+	if (resp->status != nfs_ok)
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+		return xdr_ressize_check(rqstp, p);
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 	*p++ = htonl(resp->len);
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 	xdr_ressize_check(rqstp, p);
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@@ -468,6 +490,10 @@
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 nfssvc_encode_readres(struct svc_rqst *rqstp, __be32 *p)
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 {
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 	struct nfsd_readres *resp = rqstp->rq_resp;
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+
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+	*p++ = resp->status;
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+	if (resp->status != nfs_ok)
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+		return xdr_ressize_check(rqstp, p);
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 	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
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 	*p++ = htonl(resp->count);
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@@ -489,6 +515,10 @@
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 {
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 	struct nfsd_readdirres *resp = rqstp->rq_resp;
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+	*p++ = resp->status;
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+	if (resp->status != nfs_ok)
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+		return xdr_ressize_check(rqstp, p);
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+
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 	xdr_ressize_check(rqstp, p);
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 	p = resp->buffer;
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 	*p++ = 0;			/* no more entries */
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@@ -503,6 +533,10 @@
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 {
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 	struct nfsd_statfsres *resp = rqstp->rq_resp;
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 	struct kstatfs	*stat = &resp->stats;
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+
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+	*p++ = resp->status;
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+	if (resp->status != nfs_ok)
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+		return xdr_ressize_check(rqstp, p);
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 	*p++ = htonl(NFSSVC_MAXBLKSIZE_V2);	/* max transfer size */
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 	*p++ = htonl(stat->f_bsize);
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@@ -560,10 +594,23 @@
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 /*
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  * XDR release functions
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  */
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-void
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-nfssvc_release_fhandle(struct svc_rqst *rqstp)
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+void nfssvc_release_attrstat(struct svc_rqst *rqstp)
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 {
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-	struct nfsd_fhandle *resp = rqstp->rq_resp;
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+	struct nfsd_attrstat *resp = rqstp->rq_resp;
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+
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+	fh_put(&resp->fh);
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+}
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+
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+void nfssvc_release_diropres(struct svc_rqst *rqstp)
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+{
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+	struct nfsd_diropres *resp = rqstp->rq_resp;
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+
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+	fh_put(&resp->fh);
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+}
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+
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+void nfssvc_release_readres(struct svc_rqst *rqstp)
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+{
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+	struct nfsd_readres *resp = rqstp->rq_resp;
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 	fh_put(&resp->fh);
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 }