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Subject[PATCH 007 of 9] knfsd: nfsd4: acls: fix inheritance

From: J.Bruce Fields <bfields@fieldses.org>

We can be a little more flexible about the flags allowed for inheritance
(in particular, we can deal with either the presence or the absence of
INHERIT_ONLY), but we should probably reject other combinations that we
don't understand.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@suse.de>

### Diffstat output
./fs/nfsd/nfs4acl.c | 43 ++++++++++++++++++++++++++++++-------------
1 file changed, 30 insertions(+), 13 deletions(-)
diff .prev/fs/nfsd/nfs4acl.c ./fs/nfsd/nfs4acl.c
--- .prev/fs/nfsd/nfs4acl.c 2006-09-04 17:20:49.000000000 +1000
+++ ./fs/nfsd/nfs4acl.c 2006-09-04 17:26:00.000000000 +1000
@@ -63,6 +63,8 @@
#define NFS4_INHERITANCE_FLAGS (NFS4_ACE_FILE_INHERIT_ACE \
| NFS4_ACE_DIRECTORY_INHERIT_ACE | NFS4_ACE_INHERIT_ONLY_ACE)

+#define NFS4_SUPPORTED_FLAGS (NFS4_INHERITANCE_FLAGS | NFS4_ACE_IDENTIFIER_GROUP)
+
#define MASK_EQUAL(mask1, mask2) \
( ((mask1) & NFS4_ACE_MASK_ALL) == ((mask2) & NFS4_ACE_MASK_ALL) )

@@ -721,22 +723,37 @@ nfs4_acl_split(struct nfs4_acl *acl, str
ace->type != NFS4_ACE_ACCESS_DENIED_ACE_TYPE)
return -EINVAL;

- if ((ace->flag & NFS4_INHERITANCE_FLAGS)
- != NFS4_INHERITANCE_FLAGS)
- continue;
+ if (ace->flag & ~NFS4_SUPPORTED_FLAGS)
+ return -EINVAL;

- error = nfs4_acl_add_ace(dacl, ace->type, ace->flag,
+ switch (ace->flag & NFS4_INHERITANCE_FLAGS) {
+ case 0:
+ /* Leave this ace in the effective acl: */
+ continue;
+ case NFS4_INHERITANCE_FLAGS:
+ /* Add this ace to the default acl and remove it
+ * from the effective acl: */
+ error = nfs4_acl_add_ace(dacl, ace->type, ace->flag,
ace->access_mask, ace->whotype, ace->who);
- if (error < 0)
- goto out;
-
- list_del(h);
- kfree(ace);
- acl->naces--;
+ if (error)
+ return error;
+ list_del(h);
+ kfree(ace);
+ acl->naces--;
+ break;
+ case NFS4_INHERITANCE_FLAGS & ~NFS4_ACE_INHERIT_ONLY_ACE:
+ /* Add this ace to the default, but leave it in
+ * the effective acl as well: */
+ error = nfs4_acl_add_ace(dacl, ace->type, ace->flag,
+ ace->access_mask, ace->whotype, ace->who);
+ if (error)
+ return error;
+ break;
+ default:
+ return -EINVAL;
+ }
}
-
-out:
- return error;
+ return 0;
}

static short
-
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