Re: [PATCH v2 0/5] pid: add pidfd_open()

[Linus Torvalds]

On Sat, Mar 30, 2019 at 9:19 AM Christian Brauner <christian@xxxxxxxxxx> wrote:
>
> From pure API perspective that's all I care about: independence of procfs.
> Once we have pidfd_open() we can cleanly signal threads etc.

But "independence from procfs" means that you damn well don't then do
"oh, now I have a pidfd, I want to turn it into a /proc fd and then
munge around there".

So I'm literally saying that it had better really *be* independent
from /proc. It is the standalone version, but it's most definitely
also the version that doesn't then give you secret access to /proc.

And it weorries me a lot that people are trying to play these kinds of
games. I'm just seeing some android patch that adds this horror and
then starts using it.

                      Linus