# Re: \[PATCH 03/26\] signal: Do not perform permission checks when sending pdeath\_signal

- From: Linus Torvalds \<hidden\>
- Date: 2017-06-06 20:01:44 
- List: linux-api
- Page: https://ratatoskr.run/linux-api/2017/06/5014010
- Thread: https://ratatoskr.run/linux-api/2017/06/5013915/t.md

```text
On Tue, Jun 6, 2017 at 12:03 PM, Eric W. Biederman
[ref] wrote:
>
> As this is more permisssive there is no chance anything will break.

Actually, I do worry about the security issues here.

The thing is, the parent may be some system daemon that wants to catch
SIGCHLD, but we've used prctl and changed pdeath_signal to something
else (like SIGSEGV or something).

Do we really want to be able to kill a system daemon that we couldn't
use kill() on directly, just because that system daemon spawned us?

So I think those permission checks may actually be a good idea.
Although possibly they should be in prctl()..

                   Linus
```