Received: by 2002:a25:ad19:0:0:0:0:0 with SMTP id y25csp8442632ybi; Tue, 23 Jul 2019 08:36:52 -0700 (PDT) X-Google-Smtp-Source: APXvYqy4d3UztRfxT0En2FQEipEnckgr8SBb/ZrnoaaZ6DGHUR6nedbStES6kDCx6Q7WQjlc527R X-Received: by 2002:aa7:9516:: with SMTP id b22mr6351653pfp.106.1563896212747; Tue, 23 Jul 2019 08:36:52 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1563896212; cv=none; d=google.com; s=arc-20160816; b=NCoWA0fq3skqpv2Pgy9ZnjkHn6pYvfAJtManxOSqUCJzdcIMam1R/C9G5Xb1D2TOs8 xb3sQeWfLG3Qr3hijGyHnn261bI6Xn9fwiSVTVh7Fta38pnBwT+TSmX+K1KDltJ6uRfr 1mfAgojT5UGLbPiHsmP5DuP3HLV2/Ruw8NBwUChvRlaS/8ScQCpa5sE+mtHl2ic5wK3q K8Pmqzhm4BRAopvEsMg9yvkulkFIyZNCKau4KWVjUY0lTH8wyPDyYTYZtKrNNnq+lU6x RVjwRKCClTGK/77f6lOAR9GLjmaANJ7A6mKFmrV6NW5CPlWbvTsmEs7R1iBHYIMCs7R5 /kcQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:user-agent:in-reply-to :content-disposition:mime-version:references:message-id:subject:cc :to:from:date:dkim-signature; bh=1R2qVL2FwLoBS7z/Jf8svy/wd0xYkPtd4YrOC2qNAxI=; b=YsJpF4K2gy8lpcFnoz13cctd2Y89nuTP1K9wrIm3+oNzWkQxIOghm+aHRKA9ihlXuB AeBsnhbrFRYi5zcye8E60G8sJLBfQ4ECzkNDZ4QycJNzvbeC1gHXJzOTtvwFkCIQZS49 nYizJiIn5DOS9M4CgMobwRE274b/D2ys4GfLWO7AQ8ulsVBRux28VlHFGSszMPd6LDZ/ 2UHY1cIqMj36v+JrBYIBizmo/rw5QVIsMX3tmfhQp/HQzdYWU2GvkNeyRxKy6ny+EkYF yYcXm9j0khrof9q6Cl2iTbTDYoeJZzIKLf6/HtghHQ6TwTdaKHXsuTp5w2yVQuxeYcs1 APDw== ARC-Authentication-Results: i=1; mx.google.com; dkim=fail header.i=@infradead.org header.s=bombadil.20170209 header.b="q7g8/hNy"; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id d184si11702633pga.551.2019.07.23.08.36.36; Tue, 23 Jul 2019 08:36:52 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=fail header.i=@infradead.org header.s=bombadil.20170209 header.b="q7g8/hNy"; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729066AbfGWJS0 (ORCPT + 99 others); Tue, 23 Jul 2019 05:18:26 -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.