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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, 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 BA5A4C2D0B1 for ; Thu, 6 Feb 2020 11:17:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 91475206CC for ; Thu, 6 Feb 2020 11:17:06 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=cloudflare.com header.i=@cloudflare.com header.b="PYvVPgFT" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727787AbgBFLRF (ORCPT ); Thu, 6 Feb 2020 06:17:05 -0500 Received: from mail-wm1-f67.google.com ([209.85.128.67]:38273 "EHLO mail-wm1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727724AbgBFLRC (ORCPT ); Thu, 6 Feb 2020 06:17:02 -0500 Received: by mail-wm1-f67.google.com with SMTP id a9so6564924wmj.3 for ; Thu, 06 Feb 2020 03:17:00 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cloudflare.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=WgjC54an/BsE9+r+d7h+ThtXSsEnf/5wIybUYx0C7/s=; b=PYvVPgFTYk2ky/EPLel3tNo86NsfUQWDr0ifWuQjf+cvL0Wbm84skc6h+eooSBmLks RL+UWkAYk2erkGpt2jjWWouF6C2UAwJWOeQRpelql71vs2nz2ySuzzUNU7x0t+4bfRvq dK5Zgr+zVRKVMam1Z6/dcWglTRrIzajHbWcKc= 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:in-reply-to :references:mime-version:content-transfer-encoding; bh=WgjC54an/BsE9+r+d7h+ThtXSsEnf/5wIybUYx0C7/s=; b=kAFLF/Ce1O8MUwS2lqNUWf4Yf32rFIyUT+gTWiEoVk70sqizY61Yb5AixV0m5OCRyf a8qyIuVaRH7j+/jNPCnw9rguGa+d9qpb1BsH+nqBmvLvTi9aHvNvMMvefWo3B0aTHEjG glLpg0IL0rNl0M3TT4Zdj+0tfxKT9bUdTX8AoYwxoSebotF1APwPvCwxQkHFZQtjAvbe U5/ZI66IRJMWvvxMnOWFEq2Hj5C0wZd/cKgcPFa+kFFRvss6FAcRly/W8/6rODUuUJBK IgXVNnv7BuGvuy3Ydoj/3oQXflpcoudDvOuNo1ITDpsBAZvpqginh5/5Nm19g+6flF1/ HjMg== X-Gm-Message-State: APjAAAUR6sWlMqACkJyLkB5E5S1UaQy/AcKPsPdQsBFpjsmn6w2uCvsT QQRLOCSvak9kKaxEOreAyP8XWg== X-Google-Smtp-Source: APXvYqx0hcoSru418OaERRG7HYUyMtGRJbQvWS6e7ehBSfajeZpRXufOLaPiAT9GKHFS6p2Kpt3bmw== X-Received: by 2002:a05:600c:2290:: with SMTP id 16mr4058246wmf.93.1580987820279; Thu, 06 Feb 2020 03:17:00 -0800 (PST) Received: from cloudflare.com ([176.221.114.230]) by smtp.gmail.com with ESMTPSA id a26sm3470605wmm.18.2020.02.06.03.16.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 06 Feb 2020 03:16:59 -0800 (PST) From: Jakub Sitnicki To: bpf@vger.kernel.org Cc: netdev@vger.kernel.org, kernel-team@cloudflare.com, John Fastabend Subject: [PATCH bpf 3/3] selftests/bpf: Test freeing sockmap/sockhash with a socket in it Date: Thu, 6 Feb 2020 12:16:52 +0100 Message-Id: <20200206111652.694507-4-jakub@cloudflare.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200206111652.694507-1-jakub@cloudflare.com> References: <20200206111652.694507-1-jakub@cloudflare.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Commit 7e81a3530206 ("bpf: Sockmap, ensure sock lock held during tear down") introduced sleeping issues inside RCU critical sections and while holding a spinlock on sockmap/sockhash tear-down. There has to be at least one socket in the map for the problem to surface. This adds a test that triggers the warnings for broken locking rules. Not a fix per se, but rather tooling to verify the accompanying fixes. Run on a VM with 1 vCPU to reproduce the warnings. Fixes: 7e81a3530206 ("bpf: Sockmap, ensure sock lock held during tear down") Signed-off-by: Jakub Sitnicki --- .../selftests/bpf/prog_tests/sockmap_basic.c | 74 +++++++++++++++++++ 1 file changed, 74 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/sockmap_basic.c diff --git a/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c b/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c new file mode 100644 index 000000000000..07f5b462c2ef --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c @@ -0,0 +1,74 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2020 Cloudflare + +#include "test_progs.h" + +static int connected_socket_v4(void) +{ + struct sockaddr_in addr = { + .sin_family = AF_INET, + .sin_port = htons(80), + .sin_addr = { inet_addr("127.0.0.1") }, + }; + socklen_t len = sizeof(addr); + int s, repair, err; + + s = socket(AF_INET, SOCK_STREAM, 0); + if (CHECK_FAIL(s == -1)) + goto error; + + repair = TCP_REPAIR_ON; + err = setsockopt(s, SOL_TCP, TCP_REPAIR, &repair, sizeof(repair)); + if (CHECK_FAIL(err)) + goto error; + + err = connect(s, (struct sockaddr *)&addr, len); + if (CHECK_FAIL(err)) + goto error; + + repair = TCP_REPAIR_OFF_NO_WP; + err = setsockopt(s, SOL_TCP, TCP_REPAIR, &repair, sizeof(repair)); + if (CHECK_FAIL(err)) + goto error; + + return s; +error: + perror(__func__); + close(s); + return -1; +} + +/* Create a map, populate it with one socket, and free the map. */ +static void test_sockmap_create_update_free(enum bpf_map_type map_type) +{ + const int zero = 0; + int s, map, err; + + s = connected_socket_v4(); + if (CHECK_FAIL(s == -1)) + return; + + map = bpf_create_map(map_type, sizeof(int), sizeof(int), 1, 0); + if (CHECK_FAIL(map == -1)) { + perror("bpf_create_map"); + goto out; + } + + err = bpf_map_update_elem(map, &zero, &s, BPF_NOEXIST); + if (CHECK_FAIL(err)) { + perror("bpf_map_update"); + goto out; + } + +out: + close(map); + close(s); +} + +void test_sockmap_basic(void) +{ + if (test__start_subtest("sockmap create_update_free")) + test_sockmap_create_update_free(BPF_MAP_TYPE_SOCKMAP); + if (test__start_subtest("sockhash create_update_free")) + test_sockmap_create_update_free(BPF_MAP_TYPE_SOCKHASH); +} -- 2.24.1