From: Serge Hallyn <serue@us.ibm.com>

Hook permission to check vfsmnt->user_ns against current.

Signed-off-by: Serge E. Hallyn <serue@us.ibm.com>
---
 fs/namei.c |    4 ++++
 1 file changed, 4 insertions(+)

Index: 2.6.19-rc6-mm2/fs/namei.c
===================================================================
--- 2.6.19-rc6-mm2.orig/fs/namei.c
+++ 2.6.19-rc6-mm2/fs/namei.c
@@ -246,6 +246,8 @@ int permission(struct inode *inode, int 
 			return -EACCES;
 	}
 
+	if (nd && !task_mnt_same_uid(current, nd->mnt))
+		return -EACCES;
 
 	/*
 	 * MAY_EXEC on regular files requires special handling: We override
@@ -433,6 +435,8 @@ static int exec_permission_lite(struct i
 {
 	umode_t	mode = inode->i_mode;
 
+	if (!task_mnt_same_uid(current, nd->mnt))
+		return -EACCES;
 	if (inode->i_op && inode->i_op->permission)
 		return -EAGAIN;
 

-- 
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