From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CF522C433F5 for ; Mon, 14 Feb 2022 10:11:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345513AbiBNKLy (ORCPT ); Mon, 14 Feb 2022 05:11:54 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:36208 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345613AbiBNKKR (ORCPT ); Mon, 14 Feb 2022 05:10:17 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4CB818596D; Mon, 14 Feb 2022 01:50:29 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id EE681B80DC4; Mon, 14 Feb 2022 09:50:27 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0AE8DC340E9; Mon, 14 Feb 2022 09:50:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1644832226; bh=h/90sFQJ4ADpeoVXdbJhADLAI2IKpcQnwVbtczvVWjg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OnlsUtoiNxzNt7BFEzwCq+8HqjNqKh1DI9hggkVYyZcMn+5tuFc0c5mgWiUbyNZPF S8COhxnq/ZRWL83fIE19abQxDdfHFnEPh+mN8HFyxqyGxpD2QNG2QOE9LJJC7+BP7A YbHdVXS7mZn/7qN8J5UaSmAS/ZbOvLVHQPlK3jZQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Paolo Abeni , Vlad Buslov , Antoine Tenart , "David S. Miller" , Sasha Levin Subject: [PATCH 5.15 119/172] net: do not keep the dst cache when uncloning an skb dst and its metadata Date: Mon, 14 Feb 2022 10:26:17 +0100 Message-Id: <20220214092510.537425287@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220214092506.354292783@linuxfoundation.org> References: <20220214092506.354292783@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Antoine Tenart [ Upstream commit cfc56f85e72f5b9c5c5be26dc2b16518d36a7868 ] When uncloning an skb dst and its associated metadata a new dst+metadata is allocated and the tunnel information from the old metadata is copied over there. The issue is the tunnel metadata has references to cached dst, which are copied along the way. When a dst+metadata refcount drops to 0 the metadata is freed including the cached dst entries. As they are also referenced in the initial dst+metadata, this ends up in UaFs. In practice the above did not happen because of another issue, the dst+metadata was never freed because its refcount never dropped to 0 (this will be fixed in a subsequent patch). Fix this by initializing the dst cache after copying the tunnel information from the old metadata to also unshare the dst cache. Fixes: d71785ffc7e7 ("net: add dst_cache to ovs vxlan lwtunnel") Cc: Paolo Abeni Reported-by: Vlad Buslov Tested-by: Vlad Buslov Signed-off-by: Antoine Tenart Acked-by: Paolo Abeni Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- include/net/dst_metadata.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/include/net/dst_metadata.h b/include/net/dst_metadata.h index 14efa0ded75dd..b997e0c1e3627 100644 --- a/include/net/dst_metadata.h +++ b/include/net/dst_metadata.h @@ -123,6 +123,19 @@ static inline struct metadata_dst *tun_dst_unclone(struct sk_buff *skb) memcpy(&new_md->u.tun_info, &md_dst->u.tun_info, sizeof(struct ip_tunnel_info) + md_size); +#ifdef CONFIG_DST_CACHE + /* Unclone the dst cache if there is one */ + if (new_md->u.tun_info.dst_cache.cache) { + int ret; + + ret = dst_cache_init(&new_md->u.tun_info.dst_cache, GFP_ATOMIC); + if (ret) { + metadata_dst_free(new_md); + return ERR_PTR(ret); + } + } +#endif + skb_dst_drop(skb); dst_hold(&new_md->dst); skb_dst_set(skb, &new_md->dst); -- 2.34.1