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-rw-r--r--fs/nfsd/nfsfh.c31
1 files changed, 27 insertions, 4 deletions
diff --git a/fs/nfsd/nfsfh.c b/fs/nfsd/nfsfh.c
index 100ae56..f45451e 100644
--- a/fs/nfsd/nfsfh.c
+++ b/fs/nfsd/nfsfh.c
@@ -176,9 +176,24 @@ static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp)
if (IS_ERR(exp))
return nfserrno(PTR_ERR(exp));
- error = nfsd_setuser_and_check_port(rqstp, exp);
- if (error)
- goto out;
+ if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) {
+ /* Elevate privileges so that the lack of 'r' or 'x'
+ * permission on some parent directory will
+ * not stop exportfs_decode_fh from being able
+ * to reconnect a directory into the dentry cache.
+ * The same problem can affect "SUBTREECHECK" exports,
+ * but as nfsd_acceptable depends on correct
+ * access control settings being in effect, we cannot
+ * fix that case easily.
+ */
+ current->cap_effective =
+ cap_raise_nfsd_set(current->cap_effective,
+ current->cap_permitted);
+ } else {
+ error = nfsd_setuser_and_check_port(rqstp, exp);
+ if (error)
+ goto out;
+ }
/*
* Look up the dentry using the NFS file handle.
@@ -215,6 +230,14 @@ static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp)
goto out;
}
+ if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) {
+ error = nfsd_setuser_and_check_port(rqstp, exp);
+ if (error) {
+ dput(dentry);
+ goto out;
+ }
+ }
+
if (S_ISDIR(dentry->d_inode->i_mode) &&
(dentry->d_flags & DCACHE_DISCONNECTED)) {
printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %s/%s\n",
@@ -279,7 +302,7 @@ fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, int access)
if (error)
goto out;
- if (!(access & MAY_LOCK)) {
+ if (!(access & NFSD_MAY_LOCK)) {
/*
* pseudoflavor restrictions are not enforced on NLM,
* which clients virtually always use auth_sys for,
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