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, 2 insertions, 1 deletions

diff --git a/arch/um/drivers/mconsole_kern.c b/arch/um/drivers/mconsole_kern.c
index 19d579d74d27..16d3b3789a50 100644
--- a/arch/um/drivers/mconsole_kern.c
+++ b/arch/um/drivers/mconsole_kern.c
@@ -159,7 +159,8 @@ void mconsole_proc(struct mc_request *req)
                 goto out_kill;
         }
 
-        file = dentry_open(nd.path.dentry, nd.path.mnt, O_RDONLY);
+        file = dentry_open(nd.path.dentry, nd.path.mnt, O_RDONLY,
+                           current_cred());
         if (IS_ERR(file)) {
                 mconsole_reply(req, "Failed to open file", 1, 0);
                 goto out_kill;