RE: [PATCH] proc: allow killing processes via file descriptors

[David Laight]

From: > Christian Brauner
> Sent: 18 November 2018 11:18
> 
> With this patch an open() call on /proc/<pid> will give userspace a handle
> to struct pid of the process associated with /proc/<pid>. This allows to
> maintain a stable handle on a process.

My 3c...

You need to add a version of fork() that returns an open fd to
/proc/pid to the parent.

Is it possible to overload fcntl() rather than ioctl() ?

More interestingly what about a 'unique pid' (eg the pid extended to
(say) 128 bits with a use count) that can be safely put into a /var/run/pid
file for a daemon and used later in a 'kill' that will only ever
reference the correct process.

	David

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