linux-kernel - [PATCH -mm 4/8] user ns: hook permission

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Date:	Thu, 4 Jan 2007 12:11:54 -0600
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Andrew Morton <akpm@...l.org>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: [PATCH -mm 4/8] user ns: hook permission

From: Serge E. Hallyn <serue@...ibm.com>
Subject: [PATCH -mm 4/8] user ns: hook permission

Hook permission to check vfsmnt->user_ns against current.

Signed-off-by: Serge E. Hallyn <serue@...ibm.com>
---
 fs/namei.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index e4f108f..d6687af 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -246,6 +246,8 @@ int permission(struct inode *inode, int 
 			return -EACCES;
 	}
 
+	if (nd && !task_mnt_same_uidns(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_uidns(current, nd->mnt))
+		return -EACCES;
 	if (inode->i_op && inode->i_op->permission)
 		return -EAGAIN;
 
-- 
1.4.1

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