acct: block access to kernel internal filesystems

There's no point in allowing anything kernel internal nor procfs or
sysfs.

Reported-by: Zicheng Qu <quzicheng@huawei.com>
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: <stable@vger.kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
1 file changed