From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7F4CDC7618B for ; Tue, 23 Jul 2019 09:18:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 57AD8223DD for ; Tue, 23 Jul 2019 09:18:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="q7g8/hNy" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388945AbfGWJS1 (ORCPT ); Tue, 23 Jul 2019 05:18:27 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:51152 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726853AbfGWJS0 (ORCPT ); Tue, 23 Jul 2019 05:18:26 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=1R2qVL2FwLoBS7z/Jf8svy/wd0xYkPtd4YrOC2qNAxI=; b=q7g8/hNy8aFZ0LMT7ZqZPMk// Q0DUxwvVvzOK8PKRTEv3qhxbmWl3rAvcESRwXrYHKFHpBOh6jIiT/NIxKILGoy//vj8RcW30+mxwf YA2G3k9eFicpCxP2GMrxkQYUTe5TagQukzxEKIKF2KSRPx63808YO2aeI39Fhn8CevZp/XBlTotUk At0x4KIF+6eyPX9dN9/J5+CSi2QVwe5y1MQNyBz6kMSgiOH4hL1s73dyPfWYKs+3TvpowGIAEKNJ/ SglBCQcW7dO9zu7Omy+PlLEMDIUB3m1IOdHvYXmxZ8M+KmyCn/qIJGtl4orsU8pUQ5Aa+H3KLeec5 3GrmOQJKg==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=hirez.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hpqwA-0005fs-Cm; Tue, 23 Jul 2019 09:18:22 +0000 Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id A20B820B9A4F6; Tue, 23 Jul 2019 11:18:20 +0200 (CEST) Date: Tue, 23 Jul 2019 11:18:20 +0200 From: Peter Zijlstra To: Andy Lutomirski Cc: Kees Cook , Thomas Gleixner , Sean Christopherson , Vincenzo Frascino , X86 ML , LKML Subject: Re: [5.2 REGRESSION] Generic vDSO breaks seccomp-enabled userspace on i386 Message-ID: <20190723091820.GZ3402@hirez.programming.kicks-ass.net> References: <20190719170343.GA13680@linux.intel.com> <19EF7AC8-609A-4E86-B45E-98DFE965DAAB@amacapital.net> <201907221012.41504DCD@keescook> <201907221135.2C2D262D8@keescook> <201907221620.F31B9A082@keescook> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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.