netdev - Re: [PATCH bpf] bpf: prevent out-of-bounds speculation

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Date:   Wed, 17 Jan 2018 14:47:50 +0000
From:   Alan Cox <alan@...ux.intel.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Mark Rutland <mark.rutland@....com>
Cc:     Alexei Starovoitov <ast@...com>,
        "David S . Miller" <davem@...emloft.net>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jann Horn <jannh@...gle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Elena Reshetova <elena.reshetova@...el.com>,
        Network Development <netdev@...r.kernel.org>,
        kernel-team <kernel-team@...com>,
        Will Deacon <will.deacon@....com>
Subject: Re: [PATCH bpf] bpf: prevent out-of-bounds speculation

>  (c) isn't actually done in any real CPU's today that I'm aware of
> (unless you want to call the return stack data speculation).

There are processors out there today that data speculate.

For Intel family 6 Core, Knights and Atom today all is good.

Alan