From patchwork Thu Aug 1 15:38:13 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hannah Peuckmann X-Patchwork-Id: 1967853 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lists.ubuntu.com (client-ip=185.125.189.65; helo=lists.ubuntu.com; envelope-from=kernel-team-bounces@lists.ubuntu.com; receiver=patchwork.ozlabs.org) Received: from lists.ubuntu.com (lists.ubuntu.com [185.125.189.65]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4WZY5b0YSbz1ydq for ; Fri, 2 Aug 2024 01:38:26 +1000 (AEST) Received: from localhost ([127.0.0.1] helo=lists.ubuntu.com) by lists.ubuntu.com with esmtp (Exim 4.86_2) (envelope-from ) id 1sZXsj-000746-4y; Thu, 01 Aug 2024 15:38:21 +0000 Received: from smtp-relay-internal-0.internal ([10.131.114.225] helo=smtp-relay-internal-0.canonical.com) by lists.ubuntu.com with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.86_2) (envelope-from ) id 1sZXsh-00073C-Cx for kernel-team@lists.ubuntu.com; Thu, 01 Aug 2024 15:38:19 +0000 Received: from mail-wm1-f69.google.com (mail-wm1-f69.google.com [209.85.128.69]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by smtp-relay-internal-0.canonical.com (Postfix) with ESMTPS id 0D5583F298 for ; Thu, 1 Aug 2024 15:38:19 +0000 (UTC) Received: by mail-wm1-f69.google.com with SMTP id 5b1f17b1804b1-4280f31c668so10902855e9.2 for ; Thu, 01 Aug 2024 08:38:19 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1722526697; x=1723131497; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=zSGNB5l8FoNvUqHKpH9baZAIGVTltKZ5QIanEv2fo0E=; b=FFPE785tF+iUWDyr4Gm7+VqceHr4Pdd/HgVBHUzL754sMLW+aBszR2wskMryO5QvGL Ee6tlZoTuyz7KzC2VkbrHU+07jujJuyNT0hI1GovUckT40aA0uI4eg4eunbrcUKVSyTJ RpFRtSM3HvFl6Kw1ePt2HDHuoc/td/UYfDxtbZ+JTabXvMCFCIRhYShrwCrBR5ZFS8un 2PxcuTBmIEkzZQ02aWj4yMLFrpLTOFyrBh+fhlEU0+b1VAKgR2VBNQ0ANsSrQ0VVwG0m 5N34cQ4JN48NcFC5/B62U0w0DI9KR6bDQ1WCf8JmOvcWcPsaMev02Rx+6NGgluu5I0m1 5cgA== X-Gm-Message-State: AOJu0Yx+IePG7DZkRJWsdLlXmGyvS9rLenqQHX7CUs5X0y6M5TC4Zr1M KAE2VjwPlU0pdYJdjY6+fpaUVUXBQn+Lg9akD/b9BXtPNQ/bHuHxESda685RZrlszNKBpv3nuH+ dFc4Wx0tPk8n1jEJf2eAMzCUX0eMzB1WYA6R4Wuis3odY10ZxY9ADgU+UXT36JJlvna9aWZfne4 A7PgGXohJzzqhd X-Received: by 2002:a05:600c:3b1d:b0:426:6ecc:e5c4 with SMTP id 5b1f17b1804b1-428e6b966ffmr1098805e9.4.1722526697280; Thu, 01 Aug 2024 08:38:17 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGIhWyYJW9NGgJpSsAixBEbhn2IpA9UbYmZtJcWb+qg1DyXoJaIcfENc8pseI9yfE3VN4aryA== X-Received: by 2002:a05:600c:3b1d:b0:426:6ecc:e5c4 with SMTP id 5b1f17b1804b1-428e6b966ffmr1098615e9.4.1722526696570; Thu, 01 Aug 2024 08:38:16 -0700 (PDT) Received: from bojack.home (085081016045.dynamic.telenor.dk. [85.81.16.45]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-36b367c0113sm19698759f8f.14.2024.08.01.08.38.15 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 01 Aug 2024 08:38:16 -0700 (PDT) From: Hannah Peuckmann To: kernel-team@lists.ubuntu.com Subject: [SRU][J][PATCH v2 1/1] netfilter: nf_tables: restore set elements when delete set fails Date: Thu, 1 Aug 2024 17:38:13 +0200 Message-ID: <20240801153813.61841-3-hannah.peuckmann@canonical.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240801153813.61841-1-hannah.peuckmann@canonical.com> References: <20240801153813.61841-1-hannah.peuckmann@canonical.com> MIME-Version: 1.0 X-BeenThere: kernel-team@lists.ubuntu.com X-Mailman-Version: 2.1.20 Precedence: list List-Id: Kernel team discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kernel-team-bounces@lists.ubuntu.com Sender: "kernel-team" From: Pablo Neira Ayuso From abort path, nft_mapelem_activate() needs to restore refcounters to the original state. Currently, it uses the set->ops->walk() to iterate over these set elements. The existing set iterator skips inactive elements in the next generation, this does not work from the abort path to restore the original state since it has to skip active elements instead (not inactive ones). This patch moves the check for inactive elements to the set iterator callback, then it reverses the logic for the .activate case which needs to skip active elements. Toggle next generation bit for elements when delete set command is invoked and call nft_clear() from .activate (abort) path to restore the next generation bit. The splat below shows an object in mappings memleak: [43929.457523] ------------[ cut here ]------------ [43929.457532] WARNING: CPU: 0 PID: 1139 at include/net/netfilter/nf_tables.h:1237 nft_setelem_data_deactivate+0xe4/0xf0 [nf_tables] [...] [43929.458014] RIP: 0010:nft_setelem_data_deactivate+0xe4/0xf0 [nf_tables] [43929.458076] Code: 83 f8 01 77 ab 49 8d 7c 24 08 e8 37 5e d0 de 49 8b 6c 24 08 48 8d 7d 50 e8 e9 5c d0 de 8b 45 50 8d 50 ff 89 55 50 85 c0 75 86 <0f> 0b eb 82 0f 0b eb b3 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 [43929.458081] RSP: 0018:ffff888140f9f4b0 EFLAGS: 00010246 [43929.458086] RAX: 0000000000000000 RBX: ffff8881434f5288 RCX: dffffc0000000000 [43929.458090] RDX: 00000000ffffffff RSI: ffffffffa26d28a7 RDI: ffff88810ecc9550 [43929.458093] RBP: ffff88810ecc9500 R08: 0000000000000001 R09: ffffed10281f3e8f [43929.458096] R10: 0000000000000003 R11: ffff0000ffff0000 R12: ffff8881434f52a0 [43929.458100] R13: ffff888140f9f5f4 R14: ffff888151c7a800 R15: 0000000000000002 [43929.458103] FS: 00007f0c687c4740(0000) GS:ffff888390800000(0000) knlGS:0000000000000000 [43929.458107] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [43929.458111] CR2: 00007f58dbe5b008 CR3: 0000000123602005 CR4: 00000000001706f0 [43929.458114] Call Trace: [43929.458118] [43929.458121] ? __warn+0x9f/0x1a0 [43929.458127] ? nft_setelem_data_deactivate+0xe4/0xf0 [nf_tables] [43929.458188] ? report_bug+0x1b1/0x1e0 [43929.458196] ? handle_bug+0x3c/0x70 [43929.458200] ? exc_invalid_op+0x17/0x40 [43929.458211] ? nft_setelem_data_deactivate+0xd7/0xf0 [nf_tables] [43929.458271] ? nft_setelem_data_deactivate+0xe4/0xf0 [nf_tables] [43929.458332] nft_mapelem_deactivate+0x24/0x30 [nf_tables] [43929.458392] nft_rhash_walk+0xdd/0x180 [nf_tables] [43929.458453] ? __pfx_nft_rhash_walk+0x10/0x10 [nf_tables] [43929.458512] ? rb_insert_color+0x2e/0x280 [43929.458520] nft_map_deactivate+0xdc/0x1e0 [nf_tables] [43929.458582] ? __pfx_nft_map_deactivate+0x10/0x10 [nf_tables] [43929.458642] ? __pfx_nft_mapelem_deactivate+0x10/0x10 [nf_tables] [43929.458701] ? __rcu_read_unlock+0x46/0x70 [43929.458709] nft_delset+0xff/0x110 [nf_tables] [43929.458769] nft_flush_table+0x16f/0x460 [nf_tables] [43929.458830] nf_tables_deltable+0x501/0x580 [nf_tables] Fixes: 628bd3e49cba ("netfilter: nf_tables: drop map element references from preparation phase") Signed-off-by: Pablo Neira Ayuso (backported from commit e79b47a8615d42c68aaeb68971593333667382ed linux-6.9.y) [hannsofie: context adjustments in nf_tables_api.c and nft_set_pipapo.c] CVE-2024-27012 Signed-off-by: Hannah Peuckmann --- net/netfilter/nf_tables_api.c | 46 +++++++++++++++++++++++++++++----- net/netfilter/nft_set_bitmap.c | 4 +-- net/netfilter/nft_set_hash.c | 8 ++---- net/netfilter/nft_set_pipapo.c | 4 +-- net/netfilter/nft_set_rbtree.c | 4 +-- 5 files changed, 45 insertions(+), 21 deletions(-) diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index 0ba358207006..67b2dfb25f29 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -594,6 +594,12 @@ static int nft_mapelem_deactivate(const struct nft_ctx *ctx, const struct nft_set_iter *iter, struct nft_set_elem *elem) { + struct nft_set_ext *ext = nft_set_elem_ext(set, elem); + + if (!nft_set_elem_active(ext, iter->genmask)) + return 0; + + nft_set_elem_change_active(ctx->net, set, ext); nft_setelem_data_deactivate(ctx->net, set, elem); return 0; @@ -618,8 +624,8 @@ static void nft_map_catchall_deactivate(const struct nft_ctx *ctx, if (!nft_set_elem_active(ext, genmask)) continue; - elem.priv = catchall->elem; - nft_setelem_data_deactivate(ctx->net, set, &elem); + nft_set_elem_change_active(ctx->net, set, ext); + nft_setelem_data_deactivate(ctx->net, set, catchall->elem); break; } } @@ -3508,6 +3514,9 @@ int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set, const struct nft_data *data; int err; + if (!nft_set_elem_active(ext, iter->genmask)) + return 0; + if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END) return 0; @@ -3531,7 +3540,9 @@ int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set, int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set) { - u8 genmask = nft_genmask_next(ctx->net); + struct nft_set_iter dummy_iter = { + .genmask = nft_genmask_next(ctx->net), + }; struct nft_set_elem_catchall *catchall; struct nft_set_elem elem; struct nft_set_ext *ext; @@ -3539,11 +3550,11 @@ int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set) list_for_each_entry_rcu(catchall, &set->catchall_list, list) { ext = nft_set_elem_ext(set, catchall->elem); - if (!nft_set_elem_active(ext, genmask)) + if (!nft_set_elem_active(ext, dummy_iter.genmask)) continue; elem.priv = catchall->elem; - ret = nft_setelem_validate(ctx, set, NULL, &elem); + ret = nft_setelem_validate(ctx, set, &dummy_iter, &elem); if (ret < 0) return ret; } @@ -5017,6 +5028,11 @@ static int nf_tables_bind_check_setelem(const struct nft_ctx *ctx, const struct nft_set_iter *iter, struct nft_set_elem *elem) { + const struct nft_set_ext *ext = nft_set_elem_ext(set, elem); + + if (!nft_set_elem_active(ext, iter->genmask)) + return 0; + return nft_setelem_data_validate(ctx, set, elem); } @@ -5111,6 +5127,13 @@ static int nft_mapelem_activate(const struct nft_ctx *ctx, const struct nft_set_iter *iter, struct nft_set_elem *elem) { + struct nft_set_ext *ext = nft_set_elem_ext(set, elem); + + /* called from abort path, reverse check to undo changes. */ + if (nft_set_elem_active(ext, iter->genmask)) + return 0; + + nft_clear(ctx->net, ext); nft_setelem_data_activate(ctx->net, set, elem); return 0; @@ -5130,6 +5153,7 @@ static void nft_map_catchall_activate(const struct nft_ctx *ctx, continue; elem.priv = catchall->elem; + nft_clear(ctx->net, ext); nft_setelem_data_activate(ctx->net, set, &elem); break; } @@ -5400,6 +5424,9 @@ static int nf_tables_dump_setelem(const struct nft_ctx *ctx, const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); struct nft_set_dump_args *args; + if (!nft_set_elem_active(ext, iter->genmask)) + return 0; + if (nft_set_elem_expired(ext) || nft_set_elem_is_dead(ext)) return 0; @@ -6084,7 +6111,7 @@ static void nft_setelem_activate(struct net *net, struct nft_set *set, struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); if (nft_setelem_is_catchall(set, elem)) { - nft_set_elem_change_active(net, set, ext); + nft_clear(net, ext); } else { set->ops->activate(net, set, elem); } @@ -6750,9 +6777,13 @@ static int nft_setelem_flush(const struct nft_ctx *ctx, const struct nft_set_iter *iter, struct nft_set_elem *elem) { + const struct nft_set_ext *ext = nft_set_elem_ext(set, elem); struct nft_trans *trans; int err; + if (!nft_set_elem_active(ext, iter->genmask)) + return 0; + trans = nft_trans_alloc_gfp(ctx, NFT_MSG_DELSETELEM, sizeof(struct nft_trans_elem), GFP_ATOMIC); if (!trans) @@ -10036,6 +10067,9 @@ static int nf_tables_loop_check_setelem(const struct nft_ctx *ctx, { const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); + if (!nft_set_elem_active(ext, iter->genmask)) + return 0; + if (nft_set_ext_exists(ext, NFT_SET_EXT_FLAGS) && *nft_set_ext_flags(ext) & NFT_SET_ELEM_INTERVAL_END) return 0; diff --git a/net/netfilter/nft_set_bitmap.c b/net/netfilter/nft_set_bitmap.c index 60122539fee6..028955a9cb09 100644 --- a/net/netfilter/nft_set_bitmap.c +++ b/net/netfilter/nft_set_bitmap.c @@ -171,7 +171,7 @@ static void nft_bitmap_activate(const struct net *net, nft_bitmap_location(set, nft_set_ext_key(&be->ext), &idx, &off); /* Enter 11 state. */ priv->bitmap[idx] |= (genmask << off); - nft_set_elem_change_active(net, set, &be->ext); + nft_clear(net, &be->ext); } static bool nft_bitmap_flush(const struct net *net, @@ -223,8 +223,6 @@ static void nft_bitmap_walk(const struct nft_ctx *ctx, list_for_each_entry_rcu(be, &priv->list, head) { if (iter->count < iter->skip) goto cont; - if (!nft_set_elem_active(&be->ext, iter->genmask)) - goto cont; elem.priv = be; diff --git a/net/netfilter/nft_set_hash.c b/net/netfilter/nft_set_hash.c index 2013de934cef..3a96d4a77a22 100644 --- a/net/netfilter/nft_set_hash.c +++ b/net/netfilter/nft_set_hash.c @@ -189,7 +189,7 @@ static void nft_rhash_activate(const struct net *net, const struct nft_set *set, { struct nft_rhash_elem *he = elem->priv; - nft_set_elem_change_active(net, set, &he->ext); + nft_clear(net, &he->ext); } static bool nft_rhash_flush(const struct net *net, @@ -277,8 +277,6 @@ static void nft_rhash_walk(const struct nft_ctx *ctx, struct nft_set *set, if (iter->count < iter->skip) goto cont; - if (!nft_set_elem_active(&he->ext, iter->genmask)) - goto cont; elem.priv = he; @@ -587,7 +585,7 @@ static void nft_hash_activate(const struct net *net, const struct nft_set *set, { struct nft_hash_elem *he = elem->priv; - nft_set_elem_change_active(net, set, &he->ext); + nft_clear(net, &he->ext); } static bool nft_hash_flush(const struct net *net, @@ -641,8 +639,6 @@ static void nft_hash_walk(const struct nft_ctx *ctx, struct nft_set *set, hlist_for_each_entry_rcu(he, &priv->table[i], node) { if (iter->count < iter->skip) goto cont; - if (!nft_set_elem_active(&he->ext, iter->genmask)) - goto cont; elem.priv = he; diff --git a/net/netfilter/nft_set_pipapo.c b/net/netfilter/nft_set_pipapo.c index f2f8d15c9eda..ae81c5af9f71 100644 --- a/net/netfilter/nft_set_pipapo.c +++ b/net/netfilter/nft_set_pipapo.c @@ -1767,7 +1767,7 @@ static void nft_pipapo_activate(const struct net *net, { struct nft_pipapo_elem *e = elem->priv; - nft_set_elem_change_active(net, set, &e->ext); + nft_clear(net, &e->ext); } /** @@ -2069,8 +2069,6 @@ static void nft_pipapo_walk(const struct nft_ctx *ctx, struct nft_set *set, e = f->mt[r].e; - if (!nft_set_elem_active(&e->ext, iter->genmask)) - goto cont; elem.priv = e; diff --git a/net/netfilter/nft_set_rbtree.c b/net/netfilter/nft_set_rbtree.c index 5bf5572e945c..afbda7e3fd04 100644 --- a/net/netfilter/nft_set_rbtree.c +++ b/net/netfilter/nft_set_rbtree.c @@ -527,7 +527,7 @@ static void nft_rbtree_activate(const struct net *net, { struct nft_rbtree_elem *rbe = elem->priv; - nft_set_elem_change_active(net, set, &rbe->ext); + nft_clear(net, &rbe->ext); } static bool nft_rbtree_flush(const struct net *net, @@ -596,8 +596,6 @@ static void nft_rbtree_walk(const struct nft_ctx *ctx, if (iter->count < iter->skip) goto cont; - if (!nft_set_elem_active(&rbe->ext, iter->genmask)) - goto cont; elem.priv = rbe;