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 X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 CFC92C352A4 for ; Mon, 10 Feb 2020 13:01:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9DC7B20708 for ; Mon, 10 Feb 2020 13:01:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581339672; bh=Rb4+5OZy8/cgfkqgiWf+evdbzazPvvSkiaJPEhlwwHA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=WXEL7qwWnhUN0BacZef9YihY0f7AjgAVw/PU4GCL2rg/2B5TN7hm9OZXnqCZ+KY6u RnzquMzhfRXbLnUA4cQLGxKhMvaLfWdinvaofcBb+r4FzB10iiekWSATPhvrGoSc3a iQhrAArHfLLsvTP3/4jBWtNttAzcZP0Lcr8IxFEc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729804AbgBJNBA (ORCPT ); Mon, 10 Feb 2020 08:01:00 -0500 Received: from mail.kernel.org ([198.145.29.99]:41782 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729834AbgBJMkz (ORCPT ); Mon, 10 Feb 2020 07:40:55 -0500 Received: from localhost (unknown [209.37.97.194]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 537662085B; Mon, 10 Feb 2020 12:40:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581338454; bh=Rb4+5OZy8/cgfkqgiWf+evdbzazPvvSkiaJPEhlwwHA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=I6I/jkilf028Qmnt/79qqONuy8ad8Ls0554q8MCB2lQ1OPJZHoOx8slNkrWn1slqC 0q1RrJgdnqlf2vOt0vP2P5vglayP18OrjzKTjCAGMVUX7IpskcXy97yUMkzlScwVGK TvgFy0ptgNkQzjfNQXzacFYA4k1Clpn+Ya4OK2rU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Amol Grover , Daniel Borkmann , Jesper Dangaard Brouer , =?UTF-8?q?Toke=20H=C3=B8iland-J=C3=B8rgensen?= Subject: [PATCH 5.5 163/367] bpf, devmap: Pass lockdep expression to RCU lists Date: Mon, 10 Feb 2020 04:31:16 -0800 Message-Id: <20200210122439.878252174@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200210122423.695146547@linuxfoundation.org> References: <20200210122423.695146547@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Amol Grover commit 485ec2ea9cf556e9c120e07961b7b459d776a115 upstream. head is traversed using hlist_for_each_entry_rcu outside an RCU read-side critical section but under the protection of dtab->index_lock. Hence, add corresponding lockdep expression to silence false-positive lockdep warnings, and harden RCU lists. Fixes: 6f9d451ab1a3 ("xdp: Add devmap_hash map type for looking up devices by hashed index") Signed-off-by: Amol Grover Signed-off-by: Daniel Borkmann Acked-by: Jesper Dangaard Brouer Acked-by: Toke Høiland-Jørgensen Link: https://lore.kernel.org/bpf/20200123120437.26506-1-frextrite@gmail.com Signed-off-by: Greg Kroah-Hartman --- kernel/bpf/devmap.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/kernel/bpf/devmap.c +++ b/kernel/bpf/devmap.c @@ -293,7 +293,8 @@ struct bpf_dtab_netdev *__dev_map_hash_l struct hlist_head *head = dev_map_index_hash(dtab, key); struct bpf_dtab_netdev *dev; - hlist_for_each_entry_rcu(dev, head, index_hlist) + hlist_for_each_entry_rcu(dev, head, index_hlist, + lockdep_is_held(&dtab->index_lock)) if (dev->idx == key) return dev;