From patchwork Wed Feb 24 02:15:31 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ian Denhardt X-Patchwork-Id: 12102805 X-Patchwork-Delegate: bpf@iogearbox.net 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=-14.7 required=3.0 tests=BAYES_00,DATE_IN_PAST_12_24, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=ham 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 D4607C433E0 for ; Wed, 24 Feb 2021 21:23:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8B14264F08 for ; Wed, 24 Feb 2021 21:23:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234141AbhBXVXd (ORCPT ); Wed, 24 Feb 2021 16:23:33 -0500 Received: from out5-smtp.messagingengine.com ([66.111.4.29]:45367 "EHLO out5-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231160AbhBXVXd (ORCPT ); Wed, 24 Feb 2021 16:23:33 -0500 Received: from compute6.internal (compute6.nyi.internal [10.202.2.46]) by mailout.nyi.internal (Postfix) with ESMTP id 5C7D15C0184; Wed, 24 Feb 2021 16:22:47 -0500 (EST) Received: from mailfrontend2 ([10.202.2.163]) by compute6.internal (MEProxy); Wed, 24 Feb 2021 16:22:47 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zenhack.net; h= message-id:in-reply-to:references:from:date:subject:to; s=fm2; bh=FCF8aonc9ebZcZPHGE96nk/DwPt6Xq8FPGjmmFdgfeU=; b=r4eVqGoNIZa1 ncJwen/uBLeAl5gI3m0KT0vfj/CEfWoiY+jkItrtxho5o0y5njpAq9m4nWQFg2MO Y1xitlXpZYuzeqbJ4dIHCVnQ2kXHrE4xUWBKTVE5qOKQFR+4Wzxc5NB4HOPQwIl2 WKUnSHueBh+rsfJxX1vZowihA3Bff7P5wDquHc1Ro+c7aPgK4u08hia3TPRqLR7r SvGEPp4lLyZYgHRV+MbDIz6pkHeIkIuNy7QsW44zgrogNKaIsB1jEIl5CpehChJz nm4If67mk2N0I/dZABqXLeu5MXPHD2NlAf50ltWy1uUMVal22g8Wct2kp7PBl04L ZOtTEMkfTg== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=date:from:in-reply-to:message-id :references:subject:to:x-me-proxy:x-me-proxy:x-me-sender :x-me-sender:x-sasl-enc; s=fm2; bh=FCF8aonc9ebZcZPHGE96nk/DwPt6X q8FPGjmmFdgfeU=; b=LElZT34yWUplxZyP4RFHnCnHfoJSa9nB1x6JTJFql9X53 MIDz8rMfainJ8gVHAcxOBqV8aXVaOvtnGkoevpFqIDq7TLBk/xj9CvPRRzIUDcaY 2gLwzratazOFC9TLTGYuQ/LiQbi8pKaooqHHBWEtWoGQmsqsj317Zf6v3yuNj0F8 YnpEHe2o5/puP2mOR8XKVbdKpIh4Y8xL7KLFfGJd52FHwvOXZTHx89fAtgdLmMSm 0mYpWDvymnc17A+qQW6Xyi2al8IzTJ19OHywn7pgre/Ql4l5MGcdpSwMwHIRyVOs YZgik21i49Yj1lV5WI61Bs7z7EQzTM8V4WDZ6HgaQ== X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeduledrkeejgddugeeiucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucenucfjughrpefkjghfhfffuffvsedttdertddttd dtnecuhfhrohhmpefkrghnucffvghnhhgrrhguthcuoehirghnseiivghnhhgrtghkrdhn vghtqeenucggtffrrghtthgvrhhnpeegleekvdehjefhudehhfefgfdtvdduveetveekhf ekueefhffhudegvdffgfduleenucffohhmrghinhepkhgvrhhnvghlrdhorhhgnecukfhp pedutddtrddtrdefjedrvddvudenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmh epmhgrihhlfhhrohhmpehirghnseiivghnhhgrtghkrdhnvght X-ME-Proxy: Received: from localhost (pool-100-0-37-221.bstnma.fios.verizon.net [100.0.37.221]) by mail.messagingengine.com (Postfix) with ESMTPA id 15DE41080057; Wed, 24 Feb 2021 16:22:47 -0500 (EST) X-Mailbox-Line: From f4c6670a6348231d3d6f307a1313c6c1fb85fbe5 Mon Sep 17 00:00:00 2001 Message-Id: In-Reply-To: References: From: Ian Denhardt Date: Tue, 23 Feb 2021 21:15:31 -0500 Subject: [PATCH 1/2] tools, bpf_asm: Hard error on out of range jumps. To: ast@kernel.org, daniel@iogearbox.net, bpf@vger.kernel.org, netdev@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Per discussion at: https://lore.kernel.org/bpf/c964892195a6b91d20a67691448567ef528ffa6d.camel@linux.ibm.com/T/#t ...this was originally introduced as a warning due to concerns about breaking existing code, but a hard error probably makes more sense, especially given that concerns about breakage were only speculation. Acked-by: Ilya Leoshkevich Signed-off-by: Ian Denhradt --- tools/bpf/bpf_exp.y | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/tools/bpf/bpf_exp.y b/tools/bpf/bpf_exp.y index 8d48e896be50..8d03e5245da5 100644 --- a/tools/bpf/bpf_exp.y +++ b/tools/bpf/bpf_exp.y @@ -549,9 +549,11 @@ static uint8_t bpf_encode_jt_jf_offset(int off, int i) { int delta = off - i - 1; - if (delta < 0 || delta > 255) - fprintf(stderr, "warning: insn #%d jumps to insn #%d, " + if (delta < 0 || delta > 255) { + fprintf(stderr, "error: insn #%d jumps to insn #%d, " "which is out of range\n", i, off); + exit(1); + } return (uint8_t) delta; }