From: Joel Fernandes <joel@joelfernandes.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Qais Yousef <qais.yousef@arm.com>,
linux-kernel@vger.kernel.org,
Michal Gregorczyk <michalgr@live.com>,
Adrian Ratiu <adrian.ratiu@collabora.com>,
Mohammad Husain <russoue@gmail.com>,
Srinivas Ramana <sramana@codeaurora.org>,
duyuchao <yuchao.du@unisoc.com>,
Manjo Raja Rao <linux@manojrajarao.com>,
Karim Yaghmour <karim.yaghmour@opersys.com>,
Tamir Carmeli <carmeli.tamir@gmail.com>,
Yonghong Song <yhs@fb.com>, Alexei Starovoitov <ast@kernel.org>,
Brendan Gregg <brendan.d.gregg@gmail.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
Kees Cook <keescook@chromium.org>,
kernel-team@android.com, Daniel Borkmann <daniel@iogearbox.net>,
Ingo Molnar <mingo@redhat.com>,
netdev@vger.kernel.org
Subject: Re: [PATCH RFC] bpf: Add support for reading user pointers
Date: Fri, 3 May 2019 11:09:24 -0400 [thread overview]
Message-ID: <20190503150924.GD253329@google.com> (raw)
In-Reply-To: <20190503135426.GA2606@hirez.programming.kicks-ass.net>
On Fri, May 03, 2019 at 03:54:26PM +0200, Peter Zijlstra wrote:
> 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
> worked.
Thanks Peter for confirming.
next prev parent reply other threads:[~2019-05-03 15:09 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-02 20:49 [PATCH RFC] bpf: Add support for reading user pointers Joel Fernandes (Google)
2019-05-03 12:12 ` Qais Yousef
2019-05-03 13:49 ` Joel Fernandes
2019-05-03 13:54 ` Peter Zijlstra
2019-05-03 15:09 ` Joel Fernandes [this message]
2019-05-05 11:04 ` Qais Yousef
2019-05-05 13:29 ` Joel Fernandes
2019-05-05 14:46 ` Qais Yousef
2019-05-05 15:52 ` Joel Fernandes
2019-05-05 18:03 ` Joel Fernandes
2019-05-05 18:51 ` Andrii Nakryiko
2019-05-06 0:01 ` Qais Yousef
2019-05-06 18:35 ` Will Deacon
2019-05-06 20:58 ` Joel Fernandes
2019-05-06 21:57 ` Qais Yousef
2019-05-07 9:52 ` Will Deacon
2019-05-08 2:00 ` Joel Fernandes
2019-05-05 7:19 ` Alexei Starovoitov
2019-05-05 13:33 ` Joel Fernandes
2019-05-06 14:47 ` Masami Hiramatsu
2019-05-06 16:14 ` Joel Fernandes
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