Re: [PATCH 1/2 v2] kprobe: Do not use uaccess functions to access kernel memory that can fault

[Linus Torvalds]

On Fri, Feb 15, 2019 at 9:49 AM Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
>
> From: Changbin Du <changbin.du@xxxxxxxxx>
>
> The userspace can ask kprobe to intercept strings at any memory address,
> including invalid kernel address.

Again, this is not about a "kernel address" at all.

It's neither a kernel address _nor_ a user address.  It's an invalid
address entirely, and there is nothing that makes it "kernel".

Please don't talk about "invalid kernel addresses" when it is no such thing.

                      Linus