From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id EE715A0613 for ; Tue, 30 Jul 2019 16:48:43 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 9F4051C0CB; Tue, 30 Jul 2019 16:48:39 +0200 (CEST) Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by dpdk.org (Postfix) with ESMTP id A1FCF1B997; Tue, 30 Jul 2019 16:48:35 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga107.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 30 Jul 2019 07:48:34 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,327,1559545200"; d="scan'208";a="162599880" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.10]) ([10.237.221.10]) by orsmga007.jf.intel.com with ESMTP; 30 Jul 2019 07:48:31 -0700 To: Aaron Conole , David Marchand Cc: Bernard Iremonger , dev , dpdk stable , Thomas Monjalon , "Singh, Jasvinder" , Flavia Musatescu , Adrien Mazarguil References: <1562670596-27129-1-git-send-email-bernard.iremonger@intel.com> <10372251.KTS5ePcUbj@xps> From: Ferruh Yigit Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [dpdk-stable] [PATCH] librte_flow_classify: fix out-of-bounds access X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 7/30/2019 3:42 PM, Aaron Conole wrote: > David Marchand writes: > >> On Wed, Jul 10, 2019 at 11:49 PM Thomas Monjalon wrote: >>> >>> 09/07/2019 13:09, Bernard Iremonger: >>>> This patch fixes the out-of-bounds coverity issue by removing the >>>> offending line of code at line 107 in rte_flow_classify_parse.c >>>> which is never executed. >>>> >>>> Coverity issue: 343454 >>>> >>>> Fixes: be41ac2a330f ("flow_classify: introduce flow classify library") >>>> Cc: stable@dpdk.org >>>> Signed-off-by: Bernard Iremonger >>> >>> Applied, thanks >> >> We have a segfault in the unit tests since this patch. > > I think this patch is still correct. The issue is in the semantic of > the flow classify pattern. It *MUST* always have a valid end marker, > but the test passes an invalid end marker. This causes the bounds to > exceed. > > So, it would be best to fix it, either by having a "failure" on unknown > markers (f.e. -1), or by passing a length around. However, the crash > should be expected. The fact that the previous code was also incorrect > and resulted in no segfault is pure luck. > > See rte_flow_classify_parse.c:80 and test_flow_classify.c:387 > > I would be in favor of passing the lengths of the two arrays to these > APIs. That would let us still make use of the markers (for valid > construction), but also let us reason about lengths in a sane way. > > WDYT? > +1, I also just replied with something very similar. With current API the testcase is wrong, and it will crash, also the invalid action one has exact same problem. The API can be updated as you suggested, with a length field and testcases can be added back. What worries me more is the rte_flow, which uses same arguments, and open to same errors, should we consider updating rte_flow APIs to have lengths values too?