linux-kernel - Re: [5.2 REGRESSION] Generic vDSO breaks seccomp-enabled userspace on i386

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Message-ID: <20190723091820.GZ3402@hirez.programming.kicks-ass.net>
Date:   Tue, 23 Jul 2019 11:18:20 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [5.2 REGRESSION] Generic vDSO breaks seccomp-enabled userspace
 on i386

On Mon, Jul 22, 2019 at 04:47:36PM -0700, Andy Lutomirski wrote:

> I don't love this whole concept, but I also don't have a better idea.

Are we really talking about changing the kernel because BPF is expecting
things? That is, did we just elevate everything BPF can observe to ABI?

/me runs for cover.