From patchwork Wed Jun 21 23:37:59 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrii Nakryiko X-Patchwork-Id: 13288039 X-Patchwork-Delegate: paul@paul-moore.com 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 2A052EB64D8 for ; Wed, 21 Jun 2023 23:38:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229699AbjFUXiZ convert rfc822-to-8bit (ORCPT ); Wed, 21 Jun 2023 19:38:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33282 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229912AbjFUXiY (ORCPT ); Wed, 21 Jun 2023 19:38:24 -0400 Received: from mx0a-00082601.pphosted.com (mx0a-00082601.pphosted.com [67.231.145.42]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B9AFE1995 for ; Wed, 21 Jun 2023 16:38:22 -0700 (PDT) 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 35LKFbCU032359 for ; Wed, 21 Jun 2023 16:38:22 -0700 Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 3rc832s9m4-4 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Wed, 21 Jun 2023 16:38:22 -0700 Received: from twshared24695.38.frc1.facebook.com (2620:10d:c085:108::8) by mail.thefacebook.com (2620:10d:c085:11d::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.23; Wed, 21 Jun 2023 16:38:19 -0700 Received: by devbig019.vll3.facebook.com (Postfix, from userid 137359) id E32FC333E888D; Wed, 21 Jun 2023 16:38:17 -0700 (PDT) From: Andrii Nakryiko To: CC: , , , , , , , Subject: [PATCH v3 bpf-next 04/14] bpf: add BPF token support to BPF_MAP_CREATE command Date: Wed, 21 Jun 2023 16:37:59 -0700 Message-ID: <20230621233809.1941811-5-andrii@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230621233809.1941811-1-andrii@kernel.org> References: <20230621233809.1941811-1-andrii@kernel.org> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-ORIG-GUID: mypjpcShOevMRy1hXqXrqXA6goL8oZnB X-Proofpoint-GUID: mypjpcShOevMRy1hXqXrqXA6goL8oZnB X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26 definitions=2023-06-21_13,2023-06-16_01,2023-05-22_02 Precedence: bulk List-ID: Allow providing token_fd for BPF_MAP_CREATE command to allow controlled BPF map creation from unprivileged process through delegated BPF token. Further, add a filter of allowed BPF map types to BPF token, specified at BPF token creation time. This, in combination with allowed_cmds allows to create a narrowly-focused BPF token (controlled by privileged agent) with a restrictive set of BPF maps that application can attempt to create. Signed-off-by: Andrii Nakryiko --- include/linux/bpf.h | 3 + include/uapi/linux/bpf.h | 6 ++ kernel/bpf/syscall.c | 56 +++++++++++++++---- kernel/bpf/token.c | 13 +++++ tools/include/uapi/linux/bpf.h | 6 ++ .../selftests/bpf/prog_tests/libbpf_probes.c | 2 + .../selftests/bpf/prog_tests/libbpf_str.c | 3 + 7 files changed, 77 insertions(+), 12 deletions(-) diff --git a/include/linux/bpf.h b/include/linux/bpf.h index c4f1684aa138..856a147c8ce8 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -251,6 +251,7 @@ struct bpf_map { u32 btf_value_type_id; u32 btf_vmlinux_value_type_id; struct btf *btf; + struct bpf_token *token; #ifdef CONFIG_MEMCG_KMEM struct obj_cgroup *objcg; #endif @@ -1538,6 +1539,7 @@ struct bpf_token { struct work_struct work; atomic64_t refcnt; u64 allowed_cmds; + u64 allowed_map_types; }; struct bpf_struct_ops_value; @@ -2096,6 +2098,7 @@ int bpf_token_new_fd(struct bpf_token *token); struct bpf_token *bpf_token_get_from_fd(u32 ufd); bool bpf_token_allow_cmd(const struct bpf_token *token, enum bpf_cmd cmd); +bool bpf_token_allow_map_type(const struct bpf_token *token, enum bpf_map_type type); enum bpf_type { BPF_TYPE_UNSPEC = 0, diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 3c201cfe6d5c..81c88edceac5 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -962,6 +962,7 @@ enum bpf_map_type { BPF_MAP_TYPE_BLOOM_FILTER, BPF_MAP_TYPE_USER_RINGBUF, BPF_MAP_TYPE_CGRP_STORAGE, + __MAX_BPF_MAP_TYPE }; /* Note that tracing related programs such as @@ -1367,6 +1368,7 @@ union bpf_attr { * to using 5 hash functions). */ __u64 map_extra; + __u32 map_token_fd; }; struct { /* anonymous struct used by BPF_MAP_*_ELEM commands */ @@ -1657,6 +1659,10 @@ union bpf_attr { * programs */ __u64 allowed_cmds; + /* similarly to allowed_cmds, a bit set of BPF map types that + * are allowed to be created by requested BPF token; + */ + __u64 allowed_map_types; } token_create; } __attribute__((aligned(8))); diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index c48e0e829b06..0046bd579f13 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -691,6 +691,7 @@ static void bpf_map_free_deferred(struct work_struct *work) { struct bpf_map *map = container_of(work, struct bpf_map, work); struct btf_record *rec = map->record; + struct bpf_token *token = map->token; security_bpf_map_free(map); bpf_map_release_memcg(map); @@ -706,6 +707,7 @@ static void bpf_map_free_deferred(struct work_struct *work) * template bpf_map struct used during verification. */ btf_record_free(rec); + bpf_token_put(token); } static void bpf_map_put_uref(struct bpf_map *map) @@ -1010,7 +1012,7 @@ static int map_check_btf(struct bpf_map *map, const struct btf *btf, if (!IS_ERR_OR_NULL(map->record)) { int i; - if (!bpf_capable()) { + if (!bpf_token_capable(map->token, CAP_BPF)) { ret = -EPERM; goto free_map_tab; } @@ -1092,11 +1094,12 @@ static int map_check_btf(struct bpf_map *map, const struct btf *btf, return ret; } -#define BPF_MAP_CREATE_LAST_FIELD map_extra +#define BPF_MAP_CREATE_LAST_FIELD map_token_fd /* called via syscall */ static int map_create(union bpf_attr *attr) { const struct bpf_map_ops *ops; + struct bpf_token *token = NULL; int numa_node = bpf_map_attr_numa_node(attr); u32 map_type = attr->map_type; struct bpf_map *map; @@ -1147,14 +1150,32 @@ static int map_create(union bpf_attr *attr) if (!ops->map_mem_usage) return -EINVAL; + if (attr->map_token_fd) { + token = bpf_token_get_from_fd(attr->map_token_fd); + if (IS_ERR(token)) + return PTR_ERR(token); + + /* if current token doesn't grant map creation permissions, + * then we can't use this token, so ignore it and rely on + * system-wide capabilities checks + */ + if (!bpf_token_allow_cmd(token, BPF_MAP_CREATE) || + !bpf_token_allow_map_type(token, attr->map_type)) { + bpf_token_put(token); + token = NULL; + } + } + + err = -EPERM; + /* Intent here is for unprivileged_bpf_disabled to block BPF map * creation for unprivileged users; other actions depend * on fd availability and access to bpffs, so are dependent on * object creation success. Even with unprivileged BPF disabled, * capability checks are still carried out. */ - if (sysctl_unprivileged_bpf_disabled && !bpf_capable()) - return -EPERM; + if (sysctl_unprivileged_bpf_disabled && !bpf_token_capable(token, CAP_BPF)) + goto put_token; /* check privileged map type permissions */ switch (map_type) { @@ -1187,28 +1208,36 @@ static int map_create(union bpf_attr *attr) case BPF_MAP_TYPE_LRU_PERCPU_HASH: case BPF_MAP_TYPE_STRUCT_OPS: case BPF_MAP_TYPE_CPUMAP: - if (!bpf_capable()) - return -EPERM; + if (!bpf_token_capable(token, CAP_BPF)) + goto put_token; break; case BPF_MAP_TYPE_SOCKMAP: case BPF_MAP_TYPE_SOCKHASH: case BPF_MAP_TYPE_DEVMAP: case BPF_MAP_TYPE_DEVMAP_HASH: case BPF_MAP_TYPE_XSKMAP: - if (!capable(CAP_NET_ADMIN)) - return -EPERM; + if (!bpf_token_capable(token, CAP_NET_ADMIN)) + goto put_token; break; default: WARN(1, "unsupported map type %d", map_type); - return -EPERM; + goto put_token; } map = ops->map_alloc(attr); - if (IS_ERR(map)) - return PTR_ERR(map); + if (IS_ERR(map)) { + err = PTR_ERR(map); + goto put_token; + } map->ops = ops; map->map_type = map_type; + if (token) { + /* move token reference into map->token, reuse our refcnt */ + map->token = token; + token = NULL; + } + err = bpf_obj_name_cpy(map->name, attr->map_name, sizeof(attr->map_name)); if (err < 0) @@ -1281,8 +1310,11 @@ static int map_create(union bpf_attr *attr) free_map_sec: security_bpf_map_free(map); free_map: + bpf_token_put(map->token); btf_put(map->btf); map->ops->map_free(map); +put_token: + bpf_token_put(token); return err; } @@ -5081,7 +5113,7 @@ static int bpf_prog_bind_map(union bpf_attr *attr) return ret; } -#define BPF_TOKEN_CREATE_LAST_FIELD token_create.allowed_cmds +#define BPF_TOKEN_CREATE_LAST_FIELD token_create.allowed_map_types static int token_create(union bpf_attr *attr) { diff --git a/kernel/bpf/token.c b/kernel/bpf/token.c index 1ece52439701..91d8d987faea 100644 --- a/kernel/bpf/token.c +++ b/kernel/bpf/token.c @@ -110,6 +110,10 @@ int bpf_token_create(union bpf_attr *attr) /* requested cmds should be a subset of associated token's set */ if (token && !is_bit_subset_of(attr->token_create.allowed_cmds, token->allowed_cmds)) goto out; + /* requested map types should be a subset of associated token's set */ + if (token && !is_bit_subset_of(attr->token_create.allowed_map_types, + token->allowed_map_types)) + goto out; new_token = bpf_token_alloc(); if (!new_token) { @@ -118,6 +122,7 @@ int bpf_token_create(union bpf_attr *attr) } new_token->allowed_cmds = attr->token_create.allowed_cmds; + new_token->allowed_map_types = attr->token_create.allowed_map_types; ret = bpf_obj_pin_any(attr->token_create.pin_path_fd, u64_to_user_ptr(attr->token_create.pin_pathname), @@ -165,3 +170,11 @@ bool bpf_token_allow_cmd(const struct bpf_token *token, enum bpf_cmd cmd) return token->allowed_cmds & (1ULL << cmd); } + +bool bpf_token_allow_map_type(const struct bpf_token *token, enum bpf_map_type type) +{ + if (!token || type >= __MAX_BPF_MAP_TYPE) + return false; + + return token->allowed_map_types & (1ULL << type); +} diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index 3c201cfe6d5c..81c88edceac5 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -962,6 +962,7 @@ enum bpf_map_type { BPF_MAP_TYPE_BLOOM_FILTER, BPF_MAP_TYPE_USER_RINGBUF, BPF_MAP_TYPE_CGRP_STORAGE, + __MAX_BPF_MAP_TYPE }; /* Note that tracing related programs such as @@ -1367,6 +1368,7 @@ union bpf_attr { * to using 5 hash functions). */ __u64 map_extra; + __u32 map_token_fd; }; struct { /* anonymous struct used by BPF_MAP_*_ELEM commands */ @@ -1657,6 +1659,10 @@ union bpf_attr { * programs */ __u64 allowed_cmds; + /* similarly to allowed_cmds, a bit set of BPF map types that + * are allowed to be created by requested BPF token; + */ + __u64 allowed_map_types; } token_create; } __attribute__((aligned(8))); diff --git a/tools/testing/selftests/bpf/prog_tests/libbpf_probes.c b/tools/testing/selftests/bpf/prog_tests/libbpf_probes.c index 9f766ddd946a..573249a2814d 100644 --- a/tools/testing/selftests/bpf/prog_tests/libbpf_probes.c +++ b/tools/testing/selftests/bpf/prog_tests/libbpf_probes.c @@ -68,6 +68,8 @@ void test_libbpf_probe_map_types(void) if (map_type == BPF_MAP_TYPE_UNSPEC) continue; + if (strcmp(map_type_name, "__MAX_BPF_MAP_TYPE") == 0) + continue; if (!test__start_subtest(map_type_name)) continue; diff --git a/tools/testing/selftests/bpf/prog_tests/libbpf_str.c b/tools/testing/selftests/bpf/prog_tests/libbpf_str.c index efb8bd43653c..e677c0435cec 100644 --- a/tools/testing/selftests/bpf/prog_tests/libbpf_str.c +++ b/tools/testing/selftests/bpf/prog_tests/libbpf_str.c @@ -132,6 +132,9 @@ static void test_libbpf_bpf_map_type_str(void) const char *map_type_str; char buf[256]; + if (map_type == __MAX_BPF_MAP_TYPE) + continue; + map_type_name = btf__str_by_offset(btf, e->name_off); map_type_str = libbpf_bpf_map_type_str(map_type); ASSERT_OK_PTR(map_type_str, map_type_name);