[PATCH -mm 4/8] user ns: hook permission
From: Serge E. Hallyn
Date: Thu Jan 04 2007 - 13:13:30 EST
From: Serge E. Hallyn <serue@xxxxxxxxxx>
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@xxxxxxxxxx>
---
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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