Received: by 2002:ac0:a5a7:0:0:0:0:0 with SMTP id m36-v6csp647612imm; Wed, 25 Jul 2018 03:51:48 -0700 (PDT) X-Google-Smtp-Source: AAOMgpePqDErcxKyMrMH77V5LVmTQ08kb3isxX3NDUqPg0Ou9WjMjMvB3f4+GIaLcnHbMXrKdqC+ X-Received: by 2002:a62:a119:: with SMTP id b25-v6mr21395160pff.163.1532515908544; Wed, 25 Jul 2018 03:51:48 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1532515908; cv=none; d=google.com; s=arc-20160816; b=S6rw74tL3q6wGplJoqXMogihxPaGf2k0sZ2FOA0m9MW8gUtCzrhEq2QS+ov8URHfby 91bsYzJmSsfjeRaPz5w9RxGYFtmk6bM+AR9ZeHatJh8EIXwU2FonaaizgjXPYCHTm/tS dJQvjgUEQGkaznMUZIBdaEDGU8ULmSrmWRVgwRUphqlwdvk9gI5S54h3IdPom/7vgKEU J0JEDNjj2CIF66Ri9AwUAZZiSnenPrIEtJpQirKolsSpdEm/7izLV3hRoqHuHVHxBwvL qe09bEsd/TK8TIQSjf047HE9zRv8aS7CmxpjsUMzqPb31tSPwttCTZ/1VsoV4BEDCrQ4 EveA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding :content-language:in-reply-to:mime-version:user-agent:date :message-id:autocrypt:openpgp:from:references:cc:to:subject :dkim-signature:arc-authentication-results; bh=qUzhh2J/s3kbrYBU2tB2QgFf5kOXLIrTvfYitocPUkg=; b=pusabpAw7TH70kkDDu1+f7yhRaOwNgNI1SHkjp19G3IhorCuOy2+SuHmZgNmg3Q3B4 IgL/xkf4zDLmROICMHBki0vzhYPXtoWk8XgkjNhbcZalfhmSaVZgK094DS/w8E+8Pxs1 SNE/jH2FiETMzkZTuoKg6icCw+Z1wjEpolejyUMkbpqAJadhgfccxOEzn86b2nwUdr/c mrtEaFRXcjEPtn1hOa7i/IlsTIf3mjxfrozjjmYzWBkhE1vhzXHwXDfNm/TfLvouhqfO tyyJXQVRbPbcA8LiS7cIlN13nZKz6NrYwuXh4+wJU/eAQwWfFnF97TrxOXmJcJQ5r63f f8dg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=oCKpZUs2; 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; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id k4-v6si14371181pfc.328.2018.07.25.03.51.32; Wed, 25 Jul 2018 03:51:48 -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=pass header.i=@gmail.com header.s=20161025 header.b=oCKpZUs2; 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; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728848AbeGYMBs (ORCPT + 99 others); Wed, 25 Jul 2018 08:01:48 -0400 Received: from mail-lj1-f193.google.com ([209.85.208.193]:44809 "EHLO mail-lj1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728765AbeGYMBs (ORCPT ); Wed, 25 Jul 2018 08:01:48 -0400 Received: by mail-lj1-f193.google.com with SMTP id q127-v6so6256750ljq.11; Wed, 25 Jul 2018 03:50:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:openpgp:autocrypt:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=qUzhh2J/s3kbrYBU2tB2QgFf5kOXLIrTvfYitocPUkg=; b=oCKpZUs2e2Wgq5EkFPHA5fAYPQpJy/1oLTsqVrLAkLYjOGMDDo7SJQ8nTGC1yzqc1B kRHq4Emt3WWjtIHHGBAg3HefBIPvQQkGqY4MnBjSzZ9wNExDUgnRw6l7yHfS6Q3MQQiV Nw/Zd492x5TL/v/duobRvExnZk4EvrD0i9qQAgbNySU16/++DZJAjpr93hTHmTGfwJ5C aX4+FXCP4GxVx9HCK6yxsZ9XHCokvRYa+SL27eTZpcczX6LJilXcEKqO9EC2RKT5Xhru sK1NWdBPFtGJpTlFv8XPvIN75OomdtnJRVVZyYsh7Dms6wQ1dpKmwxKm8t2oWrqsm6UG GAFg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:openpgp:autocrypt :message-id:date:user-agent:mime-version:in-reply-to :content-language:content-transfer-encoding; bh=qUzhh2J/s3kbrYBU2tB2QgFf5kOXLIrTvfYitocPUkg=; b=nBloZKp/Wj5duV+bd+xEfagcqijpou+R53F+5uF23VotxzHjuoWzQJurHbtDfrVyYr Gh+8vx1mBWPqF05Zi9DCCFQ/FO7RTPx2wlIUbdxdUaBTEjpJzC24N1g3B0RLlrnGKXlG csRKiIj2tB5oEGojTYlyg6gx0mCgV/409xeWBXjX4XajJbiBDxpwX/qFc9zx0Q99bVli NmXSr53T1LguTTu0xcnLD+hT3/v01FX2h4yBI7Gx45qvJR3HUXsqvFLpg7TCkguk3plW yYfYVV1orP600wkFhqsnprtRnT1/m9RDCAZC6XcBuFCW/Mh8g3w/6q8Hnh0oYeSmFlgu /OHg== X-Gm-Message-State: AOUpUlE9jq0Y1VR8zmWkELUJ/AnDxQhVSgmov1WvjNAG14YXyBUKszJ2 LDp6BVGwKlra2FOaE+xPkUI= X-Received: by 2002:a2e:8616:: with SMTP id a22-v6mr15903803lji.43.1532515838284; Wed, 25 Jul 2018 03:50:38 -0700 (PDT) Received: from ?IPv6:2001:2012:22e:1b00:f2e2:9015:9262:3fde? ([2001:2012:22e:1b00:f2e2:9015:9262:3fde]) by smtp.gmail.com with ESMTPSA id x2-v6sm1636015ljx.64.2018.07.25.03.50.36 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 25 Jul 2018 03:50:37 -0700 (PDT) Subject: Re: [PATCH] 9p: validate PDU length To: Dominique Martinet Cc: davem@davemloft.net, v9fs-developer@lists.sourceforge.net, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller@googlegroups.com References: <20180723154404.2406-1-tomasbortoli@gmail.com> <20180725041139.GB11041@nautica> From: Tomas Bortoli Openpgp: preference=signencrypt Autocrypt: addr=tomasbortoli@gmail.com; prefer-encrypt=mutual; keydata= xsFNBFpCTZMBEADNZ1+Ibh0Z4pgGRcd1aOUMbe/YfHktmajjcoTnKmZZunjoUVAl8waeLITd BC2c8i1wHzHcnthrmb1izs5XlG6PZnl8n5tjysSNbwggzS1NcEK1qgn5VjNlHQ5aRMUwCC51 kicBiNmlQk2UuzzWwdheRGnaf+O1MNhC0GBeEDKQAL5obOU92pzflv6wWNACr+lHxdnpyies mOnRMjH16NjuTkrGbEmJe+MKp0qbjvR3R/dmFC1wczniRMQmV5w3MZ/N9wRappE+Atc1fOM+ wP7AWNuPvrKg4bN5uqKZLDFH7OFpxvjgVdWM40n0cQfqElWY9as+228Sltdd1XyHtUWRF2VW O1l5L0kX0+7+B5k/fpLhXqD3Z7DK7wRXpXmY59pofk7aFdcN97ZK+r6R7mqrwX4W9IpsPhkT kUyg3/Dx/khBZlJKFoUP325/hoH684bSiPEBroel9alB7gTq2ueoFwy6R3q5CMUw3D+CZWHA 3xllu46TRQ/Vt2g0cIHQNPoye2OWYFJ6kSEvaLpymjNDJ9ph2EuHegonDfOaYSq34ic2BcdB JkCgXRLP5K7KtRNJqqR+DM8xByeGmQv9yp6S97el+SiM9R53RhHawJZGz0EPl+2Q6+5mgh3u wXOlkmGrrSrlB8lc567l34ECl6NFtUPIL7H5vppIXAFl7JZUdQARAQABzR50b21hcyA8dG9t YXNib3J0b2xpQGdtYWlsLmNvbT7CwZQEEwEIAD4WIQSKOZIcNF9TdAG6W8ARUi5Y8x1zLgUC WkJNkwIbIwUJCWYBgAULCQgHAgYVCAkKCwIEFgIDAQIeAQIXgAAKCRARUi5Y8x1zLvCXD/9h iaZWJ6bC6jHHPGDMknFdbpNnB5w1hBivu9KwAm4LyEI+taWhmUg5WUNO1CmDa2WGSUSTk9lo uq7gH8Y7zwGrYOEDVuldjRjPFR/1yW2JdAmbwzcYkVU0ZUhyo2XzgFjsnv3vJGHk/afEopce U6mOc2BsGDpo2izVTE/HVaiLE9jyKQF6Riy04QBRAvxbDvx1rl26GIxVI6coBFf4SZhZOnc0 dzsip0/xaSRRIMG0d75weezIG49qK3IHyw2Fw5pEFY8tP0JJVxtrq2MZw+n4WmW9BVD/oCd/ b0JZ4volQbOFmdLzcAi2w7DMcKVkW11I1fiRZ/vLMvA4b79r6mn3WJ8aMIaodG6CQzmDNcsF br+XVp8rc58m9q69BTzDH0xTStxXiwozyISAe2VGbGUbK9ngU/H1RX0Y01uQ9Dz0KfyjA0/Z QOBa4N1n1qoKFzoxTpu0Vyumkc5EnTk8NdWszt7UAtNSaIZcBuWHR7Kp0DqRHwom0kgTiNXJ 8uNgvvFTkPd2Pdz1BqbpN1Fj856xPuKIiqs5qXI2yh3GhntFDbTOwOU3rr3x5NEv3wFVojdi HcLM+KVf29YkRHzuEQT5YT9h6qTk2aFRqq3HSXrP56hQ3whR7bQtziJspkuj+ekeTxcZ5lr4 9FJI03hQJ4HbHn6x/Xw0+WjIOo4jBeUEI87BTQRaQk2TARAA4JCPcQcISPAKKC1n9VQxgdH3 oMqxhJ+gh/0Yb394ZYWLf7qOVQf/MgALPQIIFpcwYrw7gK4hsN7kj1vwPFy9JIqZtkgbmJHm aCj1LkZuf8tp5uvqzMZGcgm28IO6qDhPggeUE3hfA/y5++Vt0Jsmrz5zVPY0bOrLh1bItLnF U3uoaHWkAi/rhM6WwlsxemefzKulXoR9PIGVZ/QGjBGsTkNbTpiz2KsN+Ff/ZgjBJzGQNgha kc6a+eXyGC0YE8fRoTQekTi/GqGY7gfRKkgZDPi0Ul0sPZQJo07Dpw0nh5l6sOO+1yXygcoA V7I4bUeANZ9QJzbzZALgtxbT6jTKC0HUbF9iFb0yEkffkQuhhIqud7RkITe25hZePN8Y6Px0 yF4lEVW/Ti91jMSb4mpZiAaIFcdDV0CAtIYHAcK1ZRVz//+72o4gMZlRxowxduMyRs3L5rE0 ZkFQ6aPan+NBtEk1v3RPqnsQwJsonmiEgfbvybyBpP5MzRZnoAxfQ9vyyXoI5ofbl/+l9wv8 mosKNWIjiQsX3KiyaqygtD/yed5diie5nA7eT6IjL92WfgSelhBCL4jV0fL4w8hah2Azu0Jg 1ZtjjgoDObcAKQ5dLJA0IDsgH/X/G+ZMvkPpPIVaS5QWkiv66hixdKte/4iUrN+4waxJLCit 1KGC2xPJ2UUAEQEAAcLBfAQYAQgAJhYhBIo5khw0X1N0AbpbwBFSLljzHXMuBQJaQk2TAhsM BQkJZgGAAAoJEBFSLljzHXMuOb0P/1EnY4Y6LfQ6bmhJQ6epA3fB70hRWCQsuPYLAgPKRoXy kmWH4ljqQDbA55TtIpnod/woR0IDnZcD7E9cyGzM2rHvSLXTkHhgIWacZHZopAUzq4j0lhiJ Wu57freQPU4rzMVGZXBktUsDMsJwp/3Tl2Kjqylh90qIOlB9laUusLIbl4w5J3EscIJzWvdL y1lJLtBmus/t75wN/aIB8l9YBKGuy0L4SAmjhN52pCgP/S+ANEKvdghQco51a4jD2Pv2uYH7 nUU/Y70AmqOHjPR+qZ0hAUw6B+UtWQ+Fl587Qqi2XPUzdA8G2EjGFFPRlnhf2H/gOyAfeVYL NDwDgm9Yzp7Rx0O1QOnQsXTHqk7K38AdSdM2li/I/zegeblInnLi08Gq6mT6RkD6wV9HE5U3 EIU0rDPyJo54MW39wGjfC2+PM5I0xebbxtnuTewRchVVfm7UWgLAy11pV3xM4wMSJOuqVMOz jYpWKYxDTpvsZ0ginUUY993Gb8k/CxjABEMUGVHhQPZ0OzjHIKS6cTzN6ue8bB+CGOLCaQp1 C0NRT5Tn9zpLxtf5nBExFd/zVENY5vAV2ZbKQdemO54O7j6B9DSgVRrm83GCZxbL4d+qTYBF 3tSCWw/6SG1F3q9gR9QrSC2YRjCmhijUVEh6FhZwB58TNZ1sEEttrps8TDa5tUd9 Message-ID: Date: Wed, 25 Jul 2018 12:50:36 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20180725041139.GB11041@nautica> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 07/25/2018 06:11 AM, Dominique Martinet wrote: > Tomas Bortoli wrote on Mon, Jul 23, 2018: >> diff --git a/net/9p/client.c b/net/9p/client.c >> index 18c5271910dc..92240ccf476b 100644 >> --- a/net/9p/client.c >> +++ b/net/9p/client.c >> @@ -524,6 +525,12 @@ static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) >> int ecode; >> >> err = p9_parse_header(req->rc, NULL, &type, NULL, 0); >> + if (req->rc->size >= c->msize) { > > I was looking at this again, I think it's more appropriate to use > req->rc->capacity at this point like you did in the first version of the > patch. > > I had suggested msize in the common p9_parse_header function because > that'd let us accept zc requests where the size in the pdu could be > bigger than capacity, but this isn't the case in p9_check_errors. > > If you're ok with this I'll edit your commit directly, this is less work > for me than having to check a new patch. > > Thanks, > Yes sure, just forward me the changes later. Tomas