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=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, 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 BB4C7C433E6 for ; Wed, 17 Feb 2021 18:19:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9151564E4B for ; Wed, 17 Feb 2021 18:19:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234780AbhBQSSu (ORCPT ); Wed, 17 Feb 2021 13:18:50 -0500 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:63556 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233242AbhBQSSs (ORCPT ); Wed, 17 Feb 2021 13:18:48 -0500 Received: from pps.filterd (m0044010.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 11HIAaFm030130 for ; Wed, 17 Feb 2021 10:18:06 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=facebook; bh=LcuGGa/lkzOvpYxibHJMNVvdqU5Wh69DWSoECG6gv54=; b=jlxJMUDAbUT4ZtVJ6B3cSSeP+vsvuExCDLJIenGRYvAt8Di1SQBOqwsamoGylLGWNC/C 73i020N3OJk2ZYhMKH5tztAsac/1B3DHxfAaPn7DTAkyrhBLTPKx8teJeLoX6EG+iAbi q7Nim/gbfNb090aiecY1z65/yQC5BguNXS4= Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com with ESMTP id 36s10tasdd-2 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Wed, 17 Feb 2021 10:18:06 -0800 Received: from intmgw001.25.frc3.facebook.com (2620:10d:c085:108::4) by mail.thefacebook.com (2620:10d:c085:21d::4) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1979.3; Wed, 17 Feb 2021 10:18:05 -0800 Received: by devbig003.ftw2.facebook.com (Postfix, from userid 128203) id CC0DA370502B; Wed, 17 Feb 2021 10:18:03 -0800 (PST) From: Yonghong Song To: CC: Alexei Starovoitov , Cong Wang , Daniel Borkmann , Subject: [PATCH bpf-next v2 01/11] bpf: factor out visit_func_call_insn() in check_cfg() Date: Wed, 17 Feb 2021 10:18:03 -0800 Message-ID: <20210217181803.3189758-1-yhs@fb.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20210217181803.3189437-1-yhs@fb.com> References: <20210217181803.3189437-1-yhs@fb.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-FB-Internal: Safe Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.369,18.0.761 definitions=2021-02-17_13:2021-02-16,2021-02-17 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 mlxscore=0 clxscore=1015 phishscore=0 suspectscore=0 impostorscore=0 lowpriorityscore=0 mlxlogscore=815 bulkscore=0 malwarescore=0 spamscore=0 priorityscore=1501 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2102170133 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org During verifier check_cfg(), all instructions are visited to ensure verifier can handle program control flows. This patch factored out function visit_func_call_insn() so it can be reused in later patch to visit callback function calls. There is no functionality change for this patch. Signed-off-by: Yonghong Song --- kernel/bpf/verifier.c | 35 +++++++++++++++++++++++------------ 1 file changed, 23 insertions(+), 12 deletions(-) diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 11a242932a2c..e3149239b346 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -8591,6 +8591,27 @@ static int push_insn(int t, int w, int e, struct b= pf_verifier_env *env, return DONE_EXPLORING; } =20 +static int visit_func_call_insn(int t, int insn_cnt, + struct bpf_insn *insns, + struct bpf_verifier_env *env, + bool visit_callee) +{ + int ret; + + ret =3D push_insn(t, t + 1, FALLTHROUGH, env, false); + if (ret) + return ret; + + if (t + 1 < insn_cnt) + init_explored_state(env, t + 1); + if (visit_callee) { + init_explored_state(env, t); + ret =3D push_insn(t, t + insns[t].imm + 1, BRANCH, + env, false); + } + return ret; +} + /* Visits the instruction at index t and returns one of the following: * < 0 - an error occurred * DONE_EXPLORING - the instruction was fully explored @@ -8611,18 +8632,8 @@ static int visit_insn(int t, int insn_cnt, struct = bpf_verifier_env *env) return DONE_EXPLORING; =20 case BPF_CALL: - ret =3D push_insn(t, t + 1, FALLTHROUGH, env, false); - if (ret) - return ret; - - if (t + 1 < insn_cnt) - init_explored_state(env, t + 1); - if (insns[t].src_reg =3D=3D BPF_PSEUDO_CALL) { - init_explored_state(env, t); - ret =3D push_insn(t, t + insns[t].imm + 1, BRANCH, - env, false); - } - return ret; + return visit_func_call_insn(t, insn_cnt, insns, env, + insns[t].src_reg =3D=3D BPF_PSEUDO_CALL); =20 case BPF_JA: if (BPF_SRC(insns[t].code) !=3D BPF_K) --=20 2.24.1