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-=wiyFoHuK-EFgOxtepnvKNtzad2qeCTXz0gjRdbntEPoOQ@mail.gmail.com>
Date:   Fri, 22 Feb 2019 18:32:49 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     David Miller <davem@...emloft.net>,
        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 6:29 PM Alexei Starovoitov
<alexei.starovoitov@...il.com> wrote:
>
> imo this kernel release should finish as-is and in the next cycle we can
> change probe_kernel_read() to reject user address [..]

Absolutely. Nothing is going to change right now for 5.0, which is imminent.

It's really a "long-term we really need to fix this", where the only
question is how soon "long-term" is.

                   Linus