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Date:   Fri, 3 May 2019 15:54:26 +0200
From:   Peter Zijlstra <>
To:     Joel Fernandes <>
Cc:     Qais Yousef <>,,
        Michal Gregorczyk <>,
        Adrian Ratiu <>,
        Mohammad Husain <>,
        Srinivas Ramana <>,
        duyuchao <>,
        Manjo Raja Rao <>,
        Karim Yaghmour <>,
        Tamir Carmeli <>,
        Yonghong Song <>,
        Alexei Starovoitov <>,
        Brendan Gregg <>,
        Masami Hiramatsu <>,
        Steven Rostedt <>,
        Kees Cook <>,,
        Daniel Borkmann <>,
        Ingo Molnar <>,
Subject: Re: [PATCH RFC] bpf: Add support for reading user pointers

On Fri, May 03, 2019 at 09:49:35AM -0400, Joel Fernandes wrote:
> In
> particular, we learnt with extensive discussions that user/kernel pointers
> are not necessarily distinguishable purely based on their address.

This is correct; a number of architectures have a completely separate
user and kernel address space. Much like how the old i386 4G:4G patches

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