[PATCH] knfsd: nfsd4: fix handling of directories without default ACLs

When setting an ACL that lacks inheritable ACEs on a directory, we should set
a default ACL of zero length, not a default ACL with all bits denied.

Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/nfsd/nfs4acl.c b/fs/nfsd/nfs4acl.c
index 0a69cce..832673b 100644 (file)
--- a/fs/nfsd/nfs4acl.c
+++ b/fs/nfsd/nfs4acl.c
@@ -416,6 +416,7 @@ struct posix_ace_state_array {
  * calculated so far: */
 
 struct posix_acl_state {
+       int empty;
        struct posix_ace_state owner;
        struct posix_ace_state group;
        struct posix_ace_state other;
@@ -431,6 +432,7 @@ init_state(struct posix_acl_state *state, int cnt)
        int alloc;
 
        memset(state, 0, sizeof(struct posix_acl_state));
+       state->empty = 1;
        /*
         * In the worst case, each individual acl could be for a distinct
         * named user or group, but we don't no which, so we allocate
@@ -498,6 +500,20 @@ posix_state_to_acl(struct posix_acl_state *state, unsigned int flags)
        int nace;
        int i, error = 0;
 
+       /*
+        * ACLs with no ACEs are treated differently in the inheritable
+        * and effective cases: when there are no inheritable ACEs, we
+        * set a zero-length default posix acl:
+        */
+       if (state->empty && (flags & NFS4_ACL_TYPE_DEFAULT)) {
+               pacl = posix_acl_alloc(0, GFP_KERNEL);
+               return pacl ? pacl : ERR_PTR(-ENOMEM);
+       }
+       /*
+        * When there are no effective ACEs, the following will end
+        * up setting a 3-element effective posix ACL with all
+        * permissions zero.
+        */
        nace = 4 + state->users->n + state->groups->n;
        pacl = posix_acl_alloc(nace, GFP_KERNEL);
        if (!pacl)
@@ -613,6 +629,8 @@ static void process_one_v4_ace(struct posix_acl_state *state,
        u32 mask = ace->access_mask;
        int i;
 
+       state->empty = 0;
+
        switch (ace2type(ace)) {
        case ACL_USER_OBJ:
                if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
@@ -717,7 +735,8 @@ int nfs4_acl_nfsv4_to_posix(struct nfs4_acl *acl, struct posix_acl **pacl,
                ret = PTR_ERR(*pacl);
                goto out_dstate;
        }
-       *dpacl = posix_state_to_acl(&default_acl_state, flags);
+       *dpacl = posix_state_to_acl(&default_acl_state,
+                                               flags | NFS4_ACL_TYPE_DEFAULT);
        if (IS_ERR(*dpacl)) {
                ret = PTR_ERR(*dpacl);
                posix_acl_release(*pacl);