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Message-ID: <20190503135426.GA2606@hirez.programming.kicks-ass.net> Date: Fri, 3 May 2019 15:54:26 +0200 From: Peter Zijlstra <peterz@...radead.org> To: Joel Fernandes <joel@...lfernandes.org> Cc: Qais Yousef <qais.yousef@....com>, linux-kernel@...r.kernel.org, Michal Gregorczyk <michalgr@...e.com>, Adrian Ratiu <adrian.ratiu@...labora.com>, Mohammad Husain <russoue@...il.com>, Srinivas Ramana <sramana@...eaurora.org>, duyuchao <yuchao.du@...soc.com>, Manjo Raja Rao <linux@...ojrajarao.com>, Karim Yaghmour <karim.yaghmour@...rsys.com>, Tamir Carmeli <carmeli.tamir@...il.com>, Yonghong Song <yhs@...com>, Alexei Starovoitov <ast@...nel.org>, Brendan Gregg <brendan.d.gregg@...il.com>, Masami Hiramatsu <mhiramat@...nel.org>, Steven Rostedt <rostedt@...dmis.org>, Kees Cook <keescook@...omium.org>, kernel-team@...roid.com, Daniel Borkmann <daniel@...earbox.net>, Ingo Molnar <mingo@...hat.com>, netdev@...r.kernel.org 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 worked.
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