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 9D7C6C7EE30 for ; Thu, 2 Mar 2023 23:50:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230135AbjCBXui convert rfc822-to-8bit (ORCPT ); Thu, 2 Mar 2023 18:50:38 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36098 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229892AbjCBXug (ORCPT ); Thu, 2 Mar 2023 18:50:36 -0500 Received: from mx0a-00082601.pphosted.com (mx0a-00082601.pphosted.com [67.231.145.42]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 51D044608B for ; Thu, 2 Mar 2023 15:50:30 -0800 (PST) Received: from pps.filterd (m0148461.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 322L4WwO030442 for ; Thu, 2 Mar 2023 15:50:30 -0800 Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 3p33d08wpd-3 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Thu, 02 Mar 2023 15:50:29 -0800 Received: from twshared37576.17.prn3.facebook.com (2620:10d:c085:108::4) by mail.thefacebook.com (2620:10d:c085:21d::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.17; Thu, 2 Mar 2023 15:50:29 -0800 Received: by devbig019.vll3.facebook.com (Postfix, from userid 137359) id 9681D291B7EC2; Thu, 2 Mar 2023 15:50:26 -0800 (PST) From: Andrii Nakryiko To: , , CC: , , Tejun Heo Subject: [PATCH bpf-next 04/17] bpf: honor env->test_state_freq flag in is_state_visited() Date: Thu, 2 Mar 2023 15:50:02 -0800 Message-ID: <20230302235015.2044271-5-andrii@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20230302235015.2044271-1-andrii@kernel.org> References: <20230302235015.2044271-1-andrii@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8BIT X-FB-Internal: Safe Content-Type: text/plain X-Proofpoint-ORIG-GUID: cN1SYenMpLOYzfmdHN4psQDwvRbFf3MJ X-Proofpoint-GUID: cN1SYenMpLOYzfmdHN4psQDwvRbFf3MJ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.942,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-03-02_15,2023-03-02_02,2023-02-09_01 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org env->test_state_freq flag can be set by user by passing BPF_F_TEST_STATE_FREQ program flag. This is used in a bunch of selftests to have predictable state checkpoints at every jump and so on. Currently, bounded loop handling heuristic ignores this flag if number of processed jumps and/or number of processed instructions is below some thresholds, which throws off that reliable state checkpointing. Honor this flag in all circumstances by disabling heuristic if env->test_state_freq is set. Signed-off-by: Andrii Nakryiko --- kernel/bpf/verifier.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 97f03f9fc711..154f5d251ecb 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -14556,7 +14556,8 @@ static int is_state_visited(struct bpf_verifier_env *env, int insn_idx) * This threshold shouldn't be too high either, since states * at the end of the loop are likely to be useful in pruning. */ - if (env->jmps_processed - env->prev_jmps_processed < 20 && + if (!env->test_state_freq && + env->jmps_processed - env->prev_jmps_processed < 20 && env->insn_processed - env->prev_insn_processed < 100) add_new_state = false; goto miss; -- 2.30.2