# Re: livepatch: old\_name@old\_addr scheme in livepatch sysfs directory

- From: Jessica Yu \<hidden\>
- Date: 2015-11-02 09:08:39 
- List: linux-api
- Page: https://ratatoskr.run/linux-api/2015/11/4611665
- Thread: https://ratatoskr.run/linux-api/2015/10/4611086/t.md

```text
+++ Jiri Kosina [01/11/15 10:07 +0100]:
>On Sat, 31 Oct 2015, Chris J Arges wrote:
>
>> Makes sense to me. Is there a reason why the sysfs entries are visible
>> to non-root users?
>
>Well, kptr_restrict applies only to values printed using '%pK'. So if the
>sysfs handler is using other printk() format string to print the pointer,
>it'll be leaked out (and should eventually be fixed).

Hm, I think the func.n solution might be a good temporary fix for now.
Even if we do go with func@addr and use the '%pK' format specifier we
will run into the same problem at kptr_restrict == 2.

Jessica
```