From patchwork Thu May 6 12:53:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Dumazet X-Patchwork-Id: 12242105 X-Patchwork-Delegate: kuba@kernel.org 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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 395E1C433ED for ; Thu, 6 May 2021 12:53:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EBBB8610F7 for ; Thu, 6 May 2021 12:53:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232519AbhEFMyx (ORCPT ); Thu, 6 May 2021 08:54:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53808 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229622AbhEFMyw (ORCPT ); Thu, 6 May 2021 08:54:52 -0400 Received: from mail-pj1-x1032.google.com (mail-pj1-x1032.google.com [IPv6:2607:f8b0:4864:20::1032]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A809FC061574; Thu, 6 May 2021 05:53:54 -0700 (PDT) Received: by mail-pj1-x1032.google.com with SMTP id b14-20020a17090a6e0eb0290155c7f6a356so2792810pjk.0; Thu, 06 May 2021 05:53:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=isiRHE6erzH3OqFs7FYZrU6UPnUfyE+MT5i6BPHKk6E=; b=c9xoFIb5KW84B5V2Peaf6JP1bPGGpxk9cKyTkQlgx7LPVw3RbOX4JgMPl9n4Fv4Qcb DMaQQUvseA9qJ7yhf1zHroRYGDKEJBsJU6GC4cPBvAZs6yVOV3WvTj1iCQ1reP0NAfF8 +sX7yrEH20NL4EqYiixg7wxx7UbB1es1Z4LdaDV5bRnNjwmcwaC9ug2WopsmyWuVfjx+ qYSSfVbFzRAMDPIsWQoL0GkltlYb7lQyNVFwfEiWVfRsc4dsLrsx/wWAMOQUtfH47ijZ 3haIrqHqfmjspJVRcn7Ke9ySX0Pb9Atum6FBjF8Y9ixAZsZLOidJ+056SbeeCRVMUe/6 MU7A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=isiRHE6erzH3OqFs7FYZrU6UPnUfyE+MT5i6BPHKk6E=; b=Cn/YEvp+nGPme8/jD+e0rkZgrYQUAQWnl1xv3OBUpFHioMmGlWRC8C1ommqKDoIb9G IxVRThbQlwvA9gNO9DZl4+zq1pfnkpmT1wk/1ODSVpsiIu0UPC/7tRv3IP8JzGz/mFFg 3vDv/Vja0XRvCIBy4qtfoXpqAbfRbZK88lWm6mv3+NrrDPYP3BzcNdsXRIZ3zvTar39L yIWdWsuJ2NNmMbk7xybl5UR7q7W3ERqxkZgLF3x6s8q/UNVh2lNQo89n+HsROKwD/CGK uBW8UV8HgrhyxVaozpcrsKrfhkjIdmXPuuAvcv7OMnoVFruq28T9BMWU51vxdDpID2xl F64g== X-Gm-Message-State: AOAM531reGPFNxJPvkzd5vaL/w9zhj8jGpK4NsxurS7UoL9Ptu9Shcn+ wJew/S1WOiQ3BV1OZ7H96Rm/OSWRheM= X-Google-Smtp-Source: ABdhPJyTNoyWh1KofZmp//XjKBaGBa7VMyDSXXlsoPSkW6LbnN6piHMEb7TvzgWmdjXjIRVxz55eXQ== X-Received: by 2002:a17:90a:a613:: with SMTP id c19mr17740276pjq.117.1620305634259; Thu, 06 May 2021 05:53:54 -0700 (PDT) Received: from edumazet1.svl.corp.google.com ([2620:15c:2c4:201:4970:7438:9f62:403a]) by smtp.gmail.com with ESMTPSA id s3sm2306900pgs.62.2021.05.06.05.53.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 06 May 2021 05:53:53 -0700 (PDT) From: Eric Dumazet To: Pablo Neira Ayuso , Jozsef Kadlecsik , Florian Westphal Cc: netfilter-devel@vger.kernel.org, netdev , Eric Dumazet , Eric Dumazet Subject: [PATCH net 2/2] netfilter: nf_tables: avoid potential overflows on 32bit arches Date: Thu, 6 May 2021 05:53:50 -0700 Message-Id: <20210506125350.3887306-1-eric.dumazet@gmail.com> X-Mailer: git-send-email 2.31.1.527.g47e6f16901-goog MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org From: Eric Dumazet User space could ask for very large hash tables, we need to make sure our size computations wont overflow. nf_tables_newset() needs to double check the u64 size will fit into size_t field. Signed-off-by: Eric Dumazet Fixes: 0ed6389c483d ("netfilter: nf_tables: rename set implementations") Signed-off-by: Eric Dumazet Cc: Pablo Neira Ayuso --- net/netfilter/nf_tables_api.c | 7 +++++-- net/netfilter/nft_set_hash.c | 10 +++++----- 2 files changed, 10 insertions(+), 7 deletions(-) diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index 0b7fe0a902ff56c162741e6715ad62d928381ea7..c14213bc714b1a54a4287ae898d3a096b21e00ac 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -4184,6 +4184,7 @@ static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info, unsigned char *udata; struct nft_set *set; struct nft_ctx ctx; + size_t alloc_size; u64 timeout; char *name; int err, i; @@ -4329,8 +4330,10 @@ static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info, size = 0; if (ops->privsize != NULL) size = ops->privsize(nla, &desc); - - set = kvzalloc(sizeof(*set) + size + udlen, GFP_KERNEL); + alloc_size = sizeof(*set) + size + udlen; + if (alloc_size < size) + return -ENOMEM; + set = kvzalloc(alloc_size, GFP_KERNEL); if (!set) return -ENOMEM; diff --git a/net/netfilter/nft_set_hash.c b/net/netfilter/nft_set_hash.c index 328f2ce32e4cbd772afe03a10f6d13a7ed6b93d5..7b3d0a78c5696747a2e71b1a58303fa141de6c2b 100644 --- a/net/netfilter/nft_set_hash.c +++ b/net/netfilter/nft_set_hash.c @@ -623,7 +623,7 @@ static u64 nft_hash_privsize(const struct nlattr * const nla[], const struct nft_set_desc *desc) { return sizeof(struct nft_hash) + - nft_hash_buckets(desc->size) * sizeof(struct hlist_head); + (u64)nft_hash_buckets(desc->size) * sizeof(struct hlist_head); } static int nft_hash_init(const struct nft_set *set, @@ -663,8 +663,8 @@ static bool nft_hash_estimate(const struct nft_set_desc *desc, u32 features, return false; est->size = sizeof(struct nft_hash) + - nft_hash_buckets(desc->size) * sizeof(struct hlist_head) + - desc->size * sizeof(struct nft_hash_elem); + (u64)nft_hash_buckets(desc->size) * sizeof(struct hlist_head) + + (u64)desc->size * sizeof(struct nft_hash_elem); est->lookup = NFT_SET_CLASS_O_1; est->space = NFT_SET_CLASS_O_N; @@ -681,8 +681,8 @@ static bool nft_hash_fast_estimate(const struct nft_set_desc *desc, u32 features return false; est->size = sizeof(struct nft_hash) + - nft_hash_buckets(desc->size) * sizeof(struct hlist_head) + - desc->size * sizeof(struct nft_hash_elem); + (u64)nft_hash_buckets(desc->size) * sizeof(struct hlist_head) + + (u64)desc->size * sizeof(struct nft_hash_elem); est->lookup = NFT_SET_CLASS_O_1; est->space = NFT_SET_CLASS_O_N;