From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2EF5E567F for ; Fri, 10 Nov 2023 03:49:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=none Received: from mx0a-00082601.pphosted.com (mx0a-00082601.pphosted.com [67.231.145.42]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 72A5E44BD for ; Thu, 9 Nov 2023 19:49:03 -0800 (PST) Received: from pps.filterd (m0044012.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 3A9MYLDq006390 for ; Thu, 9 Nov 2023 19:49:03 -0800 Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 3u8k5eu2kw-5 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Thu, 09 Nov 2023 19:49:03 -0800 Received: from twshared15991.38.frc1.facebook.com (2620:10d:c085:108::4) by mail.thefacebook.com (2620:10d:c085:11d::8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.34; Thu, 9 Nov 2023 19:49:00 -0800 Received: by devbig019.vll3.facebook.com (Postfix, from userid 137359) id 95B7A3B41DC00; Thu, 9 Nov 2023 19:48:48 -0800 (PST) From: Andrii Nakryiko To: , , , CC: , , , , Subject: [PATCH v10 bpf-next 05/17] bpf: add BPF token support to BPF_BTF_LOAD command Date: Thu, 9 Nov 2023 19:48:26 -0800 Message-ID: <20231110034838.1295764-6-andrii@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231110034838.1295764-1-andrii@kernel.org> References: <20231110034838.1295764-1-andrii@kernel.org> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-FB-Internal: Safe Content-Type: text/plain X-Proofpoint-ORIG-GUID: wljC7yTFl3xQmuehJKOnvB3GHMKQ7VYf X-Proofpoint-GUID: wljC7yTFl3xQmuehJKOnvB3GHMKQ7VYf X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.987,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-11-09_17,2023-11-09_01,2023-05-22_02 Accept BPF token FD in BPF_BTF_LOAD command to allow BTF data loading through delegated BPF token. BTF loading is a pretty straightforward operation, so as long as BPF token is created with allow_cmds granting BPF_BTF_LOAD command, kernel proceeds to parsing BTF data and creating BTF object. Signed-off-by: Andrii Nakryiko --- include/uapi/linux/bpf.h | 1 + kernel/bpf/syscall.c | 20 ++++++++++++++++++-- tools/include/uapi/linux/bpf.h | 1 + 3 files changed, 20 insertions(+), 2 deletions(-) diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 1ed71ea78030..61ad6828d8d4 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -1613,6 +1613,7 @@ union bpf_attr { * truncated), or smaller (if log buffer wasn't filled completely). */ __u32 btf_log_true_size; + __u32 btf_token_fd; }; =20 struct { diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 6e6c27b89b71..28ac4bdc3f32 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -4751,15 +4751,31 @@ static int bpf_obj_get_info_by_fd(const union bpf= _attr *attr, return err; } =20 -#define BPF_BTF_LOAD_LAST_FIELD btf_log_true_size +#define BPF_BTF_LOAD_LAST_FIELD btf_token_fd =20 static int bpf_btf_load(const union bpf_attr *attr, bpfptr_t uattr, __u3= 2 uattr_size) { + struct bpf_token *token =3D NULL; + if (CHECK_ATTR(BPF_BTF_LOAD)) return -EINVAL; =20 - if (!bpf_capable()) + if (attr->btf_token_fd) { + token =3D bpf_token_get_from_fd(attr->btf_token_fd); + if (IS_ERR(token)) + return PTR_ERR(token); + if (!bpf_token_allow_cmd(token, BPF_BTF_LOAD)) { + bpf_token_put(token); + token =3D NULL; + } + } + + if (!bpf_token_capable(token, CAP_BPF)) { + bpf_token_put(token); return -EPERM; + } + + bpf_token_put(token); =20 return btf_new_fd(attr, uattr, uattr_size); } diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bp= f.h index 1ed71ea78030..61ad6828d8d4 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -1613,6 +1613,7 @@ union bpf_attr { * truncated), or smaller (if log buffer wasn't filled completely). */ __u32 btf_log_true_size; + __u32 btf_token_fd; }; =20 struct { --=20 2.34.1