From patchwork Fri Feb 12 01:42:30 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Song Liu X-Patchwork-Id: 12084607 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=-19.3 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, 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 2E25DC433E0 for ; Fri, 12 Feb 2021 01:42:51 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id DA67B64E3B for ; Fri, 12 Feb 2021 01:42:50 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DA67B64E3B Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=fb.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id A94EF8D001A; Thu, 11 Feb 2021 20:42:49 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id A48EC8D0015; Thu, 11 Feb 2021 20:42:49 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 935438D001A; Thu, 11 Feb 2021 20:42:49 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0005.hostedemail.com [216.40.44.5]) by kanga.kvack.org (Postfix) with ESMTP id 7D7D58D0015 for ; Thu, 11 Feb 2021 20:42:49 -0500 (EST) Received: from smtpin05.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 35FBC181AF5C7 for ; Fri, 12 Feb 2021 01:42:49 +0000 (UTC) X-FDA: 77807916858.05.D6266AA Received: from mx0a-00082601.pphosted.com (mx0a-00082601.pphosted.com [67.231.145.42]) by imf20.hostedemail.com (Postfix) with ESMTP id 52598138 for ; Fri, 12 Feb 2021 01:42:47 +0000 (UTC) Received: from pps.filterd (m0109333.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 11C1fZcb006587 for ; Thu, 11 Feb 2021 17:42:47 -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=10THGxePXoB95sI1fdIUAVKff0RKlTtaqSdCw8eabpw=; b=aU/X74EjcqFAFxxJ+5p8SLif4aAhvvdfF4pb0Ko+YDjk6lTRIqzqK3l0geOSkVlobbx7 20gwJ4XeDNW7oX7x/6ga8JHEUJoPheZUR5fnGxl+7l7M5IsMTjh+rRywZMx2qaJqglRJ +oSf7VgkgRlDEfzaBTek0XNKPr9aOmBYB9Y= Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com with ESMTP id 36n62t4671-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Thu, 11 Feb 2021 17:42:47 -0800 Received: from intmgw002.06.ash9.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; Thu, 11 Feb 2021 17:42:46 -0800 Received: by devbig006.ftw2.facebook.com (Postfix, from userid 4523) id 1718962E0B5D; Thu, 11 Feb 2021 17:42:46 -0800 (PST) From: Song Liu To: , , CC: , , , , Song Liu , Yonghong Song Subject: [PATCH v6 bpf-next 2/4] bpf: allow bpf_d_path in sleepable bpf_iter program Date: Thu, 11 Feb 2021 17:42:30 -0800 Message-ID: <20210212014232.414643-3-songliubraving@fb.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20210212014232.414643-1-songliubraving@fb.com> References: <20210212014232.414643-1-songliubraving@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.369,18.0.737 definitions=2021-02-11_07:2021-02-11,2021-02-11 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 impostorscore=0 mlxlogscore=705 malwarescore=0 adultscore=0 phishscore=0 priorityscore=1501 clxscore=1015 bulkscore=0 lowpriorityscore=0 suspectscore=0 mlxscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2102120009 X-FB-Internal: deliver X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 52598138 X-Stat-Signature: zoi5jjise9up1adcieihgyienzxasoec Received-SPF: none (fb.com>: No applicable sender policy available) receiver=imf20; identity=mailfrom; envelope-from=""; helo=mx0a-00082601.pphosted.com; client-ip=67.231.145.42 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1613094167-217314 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: task_file and task_vma iter programs have access to file->f_path. Enable bpf_d_path to print paths of these file. bpf_iter programs are generally called in sleepable context. However, it is still necessary to diffientiate sleepable and non-sleepable bpf_iter programs: sleepable programs have access to bpf_d_path; non-sleepable programs have access to bpf_spin_lock. Acked-by: Yonghong Song Signed-off-by: Song Liu --- kernel/trace/bpf_trace.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 6c0018abe68a0..1f3becd4435ae 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -1191,6 +1191,11 @@ BTF_SET_END(btf_allowlist_d_path) static bool bpf_d_path_allowed(const struct bpf_prog *prog) { + if (prog->type == BPF_PROG_TYPE_TRACING && + prog->expected_attach_type == BPF_TRACE_ITER && + prog->aux->sleepable) + return true; + if (prog->type == BPF_PROG_TYPE_LSM) return bpf_lsm_is_sleepable_hook(prog->aux->attach_btf_id);