From patchwork Thu Nov 5 04:51:37 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrii Nakryiko X-Patchwork-Id: 1394712 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=kernel.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4CRWMh5MWCz9sSs for ; Thu, 5 Nov 2020 15:52:00 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731511AbgKEEwA convert rfc822-to-8bit (ORCPT ); Wed, 4 Nov 2020 23:52:00 -0500 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:2666 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731451AbgKEEv6 (ORCPT ); Wed, 4 Nov 2020 23:51:58 -0500 Received: from pps.filterd (m0109334.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 0A54nwBm008704 for ; Wed, 4 Nov 2020 20:51:58 -0800 Received: from maileast.thefacebook.com ([163.114.130.16]) by mx0a-00082601.pphosted.com with ESMTP id 34kg7kymx2-2 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Wed, 04 Nov 2020 20:51:58 -0800 Received: from intmgw002.08.frc2.facebook.com (2620:10d:c0a8:1b::d) by mail.thefacebook.com (2620:10d:c0a8:83::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1979.3; Wed, 4 Nov 2020 20:51:57 -0800 Received: by devbig012.ftw2.facebook.com (Postfix, from userid 137359) id 4736C2EC8E08; Wed, 4 Nov 2020 20:51:51 -0800 (PST) From: Andrii Nakryiko To: , , , CC: , , Arnaldo Carvalho de Melo Subject: [RFC PATCH bpf-next 2/5] bpf: assign ID to vmlinux BTF and return extra info for BTF in GET_OBJ_INFO Date: Wed, 4 Nov 2020 20:51:37 -0800 Message-ID: <20201105045140.2589346-3-andrii@kernel.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20201105045140.2589346-1-andrii@kernel.org> References: <20201105045140.2589346-1-andrii@kernel.org> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.312,18.0.737 definitions=2020-11-05_01:2020-11-05,2020-11-05 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 bulkscore=0 priorityscore=1501 phishscore=0 suspectscore=75 impostorscore=0 lowpriorityscore=0 adultscore=0 malwarescore=0 spamscore=0 mlxscore=0 mlxlogscore=658 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2011050035 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Allocate ID for vmlinux BTF. This makes it visible when iterating over all BTF objects in the system. To allow distinguishing vmlinux BTF (and later kernel module BTF) from user-provided BTFs, expose extra kernel_btf flag, as well as BTF name (empty for vmlinux BTF, but will be used for kernel module BTF). We might want to later allow specifying BTF name for user-provided BTFs as well, if that makes sense. But currently this is reserved only for in-kernel BTFs. Having in-kernel BTFs exposed IDs will allow to extend BPF APIs that require in-kernel BTF type with ability to specify BTF types from kernel modules, not just vmlinux BTF. This will be implemented in a follow up patch set for fentry/fexit/fmod_ret/lsm/etc. Signed-off-by: Andrii Nakryiko --- include/uapi/linux/bpf.h | 3 +++ kernel/bpf/btf.c | 38 ++++++++++++++++++++++++++++++++-- tools/include/uapi/linux/bpf.h | 3 +++ 3 files changed, 42 insertions(+), 2 deletions(-) diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index e6ceac3f7d62..7955b144f267 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -4418,6 +4418,9 @@ struct bpf_btf_info { __aligned_u64 btf; __u32 btf_size; __u32 id; + __aligned_u64 name; + __u32 name_len; + __u32 kernel_btf; } __attribute__((aligned(8))); struct bpf_link_info { diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index f61944a3873b..6a99677e57c0 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -215,6 +215,8 @@ struct btf { struct btf *base_btf; u32 start_id; /* first type ID in this BTF (0 for base BTF) */ u32 start_str_off; /* first string offset (0 for base BTF) */ + char name[MODULE_NAME_LEN]; + bool kernel_btf; }; enum verifier_phase { @@ -4441,6 +4443,7 @@ struct btf *btf_parse_vmlinux(void) btf->data = __start_BTF; btf->data_size = __stop_BTF - __start_BTF; + btf->kernel_btf = true; err = btf_parse_hdr(env); if (err) @@ -4466,8 +4469,13 @@ struct btf *btf_parse_vmlinux(void) bpf_struct_ops_init(btf, log); - btf_verifier_env_free(env); refcount_set(&btf->refcnt, 1); + + err = btf_alloc_id(btf); + if (err) + goto errout; + + btf_verifier_env_free(env); return btf; errout: @@ -5565,7 +5573,8 @@ int btf_get_info_by_fd(const struct btf *btf, struct bpf_btf_info info; u32 info_copy, btf_copy; void __user *ubtf; - u32 uinfo_len; + char __user *uname; + u32 uinfo_len, uname_len, name_len; uinfo = u64_to_user_ptr(attr->info.info); uinfo_len = attr->info.info_len; @@ -5582,6 +5591,31 @@ int btf_get_info_by_fd(const struct btf *btf, return -EFAULT; info.btf_size = btf->data_size; + info.kernel_btf = btf->kernel_btf; + + uname = u64_to_user_ptr(info.name); + uname_len = info.name_len; + if (!uname ^ !uname_len) + return -EINVAL; + + name_len = strlen(btf->name); + info.name_len = name_len; + + if (uname) { + if (uname_len >= name_len + 1) { + if (copy_to_user(uname, btf->name, name_len + 1)) + return -EFAULT; + } else { + char zero = '\0'; + + if (copy_to_user(uname, btf->name, uname_len - 1)) + return -EFAULT; + if (put_user(zero, uname + uname_len - 1)) + return -EFAULT; + return -ENOSPC; + } + } + if (copy_to_user(uinfo, &info, info_copy) || put_user(info_copy, &uattr->info.info_len)) return -EFAULT; diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index e6ceac3f7d62..7955b144f267 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -4418,6 +4418,9 @@ struct bpf_btf_info { __aligned_u64 btf; __u32 btf_size; __u32 id; + __aligned_u64 name; + __u32 name_len; + __u32 kernel_btf; } __attribute__((aligned(8))); struct bpf_link_info {