CRED: Pass credentials through dentry_open()

Pass credentials through dentry_open() so that the COW creds patch can have
SELinux's flush_unauthorized_files() pass the appropriate creds back to itself
when it opens its null chardev.

The security_dentry_open() call also now takes a creds pointer, as does the
dentry_open hook in struct security_operations.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: James Morris <jmorris@namei.org>
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c
index 80246bad1b7f..ec1fb918200f 100644
--- a/fs/exportfs/expfs.c
+++ b/fs/exportfs/expfs.c
@@ -14,6 +14,7 @@
 #include <linux/module.h>
 #include <linux/mount.h>
 #include <linux/namei.h>
+#include <linux/sched.h>
 
 #define dprintk(fmt, args...) do{}while(0)
 
@@ -249,6 +250,7 @@ static int filldir_one(void * __buf, const char * name, int len,
 static int get_name(struct vfsmount *mnt, struct dentry *dentry,
                 char *name, struct dentry *child)
 {
+        const struct cred *cred = current_cred();
         struct inode *dir = dentry->d_inode;
         int error;
         struct file *file;
@@ -263,7 +265,7 @@ static int get_name(struct vfsmount *mnt, struct dentry *dentry,
         /*
          * Open the directory ...
          */
-        file = dentry_open(dget(dentry), mntget(mnt), O_RDONLY);
+        file = dentry_open(dget(dentry), mntget(mnt), O_RDONLY, cred);
         error = PTR_ERR(file);
         if (IS_ERR(file))
                 goto out;