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

[Christian Brauner]

On Sat, Mar 30, 2019 at 09:24:23AM -0700, Linus Torvalds wrote:
> 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.

The original need for this conversion thing came from Android indeed. I
won't go forward with any such patches. 

Christian