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

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Message-ID: <CAHk-=wh9uWJaih5i6qBPer5rzcs=A+yb_ejU093b1esAhoFveQ@mail.gmail.com>
Date:   Fri, 22 Feb 2019 13:59:10 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     David Miller <davem@...emloft.net>
Cc:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Andy Lutomirski <luto@...capital.net>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        stable <stable@...r.kernel.org>,
        Changbin Du <changbin.du@...il.com>,
        Jann Horn <jannh@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Andrew Lutomirski <luto@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Netdev <netdev@...r.kernel.org>, bpf@...r.kernel.org
Subject: Re: [PATCH 1/2 v2] kprobe: Do not use uaccess functions to access
 kernel memory that can fault

On Fri, Feb 22, 2019 at 1:38 PM David Miller <davem@...emloft.net> wrote:
>
> Don't be surprised if we see more separation like this in the future too.

Yes, with the whole meltdown fiasco, there's actually more pressure to
add more support for separation of kernel/user address spaces. As Andy
pointed out, it's been discussed as a future wish-list for x86-64 too.

But yeah, right now the *common* architectures all distinguish kernel
and user space by pointers (ie x86-64, arm64 and powerpc).

                 Linus