commit c9bccef6b98ae563f725f6e315d8adc685239781
author David Quigley <dpquigl@davequigley.com> Wed May 22 12:50:45 2013 -0400
committer Trond Myklebust <Trond.Myklebust@netapp.com> Sat Jun 08 16:20:17 2013 -0400
tree 3e8d201cd4515c85b6f85a6ee3f42436c66bdbb2
parent aa9c2669626ca7e5e5bab28e6caeb583fd40099b

NFS: Extend NFS xattr handlers to accept the security namespace

The existing NFSv4 xattr handlers do not accept xattr calls to the security
namespace. This patch extends these handlers to accept xattrs from the security
namespace in addition to the default NFSv4 ACL namespace.

Acked-by: James Morris <james.l.morris@oracle.com>
Signed-off-by: Matthew N. Dodd <Matthew.Dodd@sparta.com>
Signed-off-by: Miguel Rodel Felipe <Rodel_FM@dsi.a-star.edu.sg>
Signed-off-by: Phua Eu Gene <PHUA_Eu_Gene@dsi.a-star.edu.sg>
Signed-off-by: Khin Mi Mi Aung <Mi_Mi_AUNG@dsi.a-star.edu.sg>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/nfs4proc.c

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 1dc7aec..dfef23f 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -5640,6 +5640,53 @@
 	return len;
 }
 
+#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+static inline int nfs4_server_supports_labels(struct nfs_server *server)
+{
+	return server->caps & NFS_CAP_SECURITY_LABEL;
+}
+
+static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
+				   const void *buf, size_t buflen,
+				   int flags, int type)
+{
+	if (security_ismaclabel(key))
+		return nfs4_set_security_label(dentry, buf, buflen);
+
+	return -EOPNOTSUPP;
+}
+
+static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
+				   void *buf, size_t buflen, int type)
+{
+	if (security_ismaclabel(key))
+		return nfs4_get_security_label(dentry->d_inode, buf, buflen);
+	return -EOPNOTSUPP;
+}
+
+static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
+				       size_t list_len, const char *name,
+				       size_t name_len, int type)
+{
+	size_t len = 0;
+
+	if (nfs_server_capable(dentry->d_inode, NFS_CAP_SECURITY_LABEL)) {
+		len = security_inode_listsecurity(dentry->d_inode, NULL, 0);
+		if (list && len <= list_len)
+			security_inode_listsecurity(dentry->d_inode, list, len);
+	}
+	return len;
+}
+
+static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
+	.prefix = XATTR_SECURITY_PREFIX,
+	.list	= nfs4_xattr_list_nfs4_label,
+	.get	= nfs4_xattr_get_nfs4_label,
+	.set	= nfs4_xattr_set_nfs4_label,
+};
+#endif
+
+
 /*
  * nfs_fhget will use either the mounted_on_fileid or the fileid
  */
@@ -7468,6 +7515,9 @@
 
 const struct xattr_handler *nfs4_xattr_handlers[] = {
 	&nfs4_xattr_nfs4_acl_handler,
+#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+	&nfs4_xattr_nfs4_label_handler,
+#endif
 	NULL
 };
 

security/security.c

diff --git a/security/security.c b/security/security.c
index 8d0b9a7..94b35ae 100644
--- a/security/security.c
+++ b/security/security.c
@@ -660,6 +660,7 @@
 		return 0;
 	return security_ops->inode_listsecurity(inode, buffer, buffer_size);
 }
+EXPORT_SYMBOL(security_inode_listsecurity);
 
 void security_inode_getsecid(const struct inode *inode, u32 *secid)
 {