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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 26674C43334 for ; Wed, 1 Jun 2022 20:56:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229953AbiFAU4r (ORCPT ); Wed, 1 Jun 2022 16:56:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43484 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230281AbiFAU4q (ORCPT ); Wed, 1 Jun 2022 16:56:46 -0400 Received: from mail-oa1-x49.google.com (mail-oa1-x49.google.com [IPv6:2001:4860:4864:20::49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 005BA23160 for ; Wed, 1 Jun 2022 13:56:38 -0700 (PDT) Received: by mail-oa1-x49.google.com with SMTP id 586e51a60fabf-df1ff1c731so1833802fac.12 for ; Wed, 01 Jun 2022 13:56:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=RXKl9EM4qib7IbD/zrHgEWRk4S4fWpIVCE5G5HO5GOU=; b=mhB+WeznATLkYl2LbdHUewk/1U/ZysZB6fqyK0rpfIPuuTMnLJ6gcRHvOtbTdoIK/4 zPhvMiQupAFL76HJ24aCCy7sHZ3kuJgqrBDZc5/tzhoVZkUH/No8JNGMGGoK4npwTjgM K0kPbj0WqH9Dp0DnSU25vA7SQTT+V+QYT8jmXp3HNONWN6dvAVarHrAJXiV/FkF/3dON MGar8Xpij604YOHwpJ4Jtj0WUT8Fypkt2DsBm+c2NeajIWM1Y1Sd75r4mb3u42Hi18QU 55o0EyOX61cj53DRHpFFwHGTp/uRPP1Ox0gufo1vBt+WmbwgxuPTo+bJH7MY81LethMX Zfrw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=RXKl9EM4qib7IbD/zrHgEWRk4S4fWpIVCE5G5HO5GOU=; b=7O2qKRT3WFBR4nsDXZEaEjxdsssxjCic4rzxiBCuRmft4+fNxuqntcBPRZDQLiORsy OnjcD1U7R/ergHCK6gqjywZXCuo7nWmSgrYzsYgF7NmuZaDnXxvTnWb7ywcKIxt5m587 u+glVRNokvn8yqp4Usfc+WDnInHLkRNKHLS1qkuxpnPij2DAkU0NkJi0HPnaegYfWp8x AbFBcyGid3HM6vMPLHJkMGVyPpdvPG1/85I2X8e8eEbf1is9KeEHC+wtMYquvQF3VUsl ARfs/sZwCLB30VDBmfPMpLkXQkyeQqPjXy+uuX5bRJbQnXt2e7i/v1TipsVzH2unfEZA 7OAA== X-Gm-Message-State: AOAM533dP/Kfi8d3wjfjvt04DfpGa0kmqbxzSaTRFIFSo+eWDH9iJMSH TQmAOEUB69pSpAvjU7EA4Fru9S4= X-Google-Smtp-Source: ABdhPJzojwUo6eFF1QyJpEP+hioorPSnRmbi6POqS3MVEZ1iJmso/k6SCYPa7RGCfqF1MUZvMm3oBVY= X-Received: from sdf.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5935]) (user=sdf job=sendgmr) by 2002:a17:90a:249:b0:1e0:a8a3:3c6c with SMTP id t9-20020a17090a024900b001e0a8a33c6cmr3309pje.0.1654110148549; Wed, 01 Jun 2022 12:02:28 -0700 (PDT) Date: Wed, 1 Jun 2022 12:02:12 -0700 In-Reply-To: <20220601190218.2494963-1-sdf@google.com> Message-Id: <20220601190218.2494963-6-sdf@google.com> Mime-Version: 1.0 References: <20220601190218.2494963-1-sdf@google.com> X-Mailer: git-send-email 2.36.1.255.ge46751e96f-goog Subject: [PATCH bpf-next v8 05/11] bpf: implement BPF_PROG_QUERY for BPF_LSM_CGROUP From: Stanislav Fomichev To: netdev@vger.kernel.org, bpf@vger.kernel.org Cc: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, Stanislav Fomichev Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org We have two options: 1. Treat all BPF_LSM_CGROUP the same, regardless of attach_btf_id 2. Treat BPF_LSM_CGROUP+attach_btf_id as a separate hook point I was doing (2) in the original patch, but switching to (1) here: * bpf_prog_query returns all attached BPF_LSM_CGROUP programs regardless of attach_btf_id * attach_btf_id is exported via bpf_prog_info Signed-off-by: Stanislav Fomichev --- include/uapi/linux/bpf.h | 3 ++ kernel/bpf/cgroup.c | 103 +++++++++++++++++++++++++++------------ kernel/bpf/syscall.c | 6 ++- 3 files changed, 81 insertions(+), 31 deletions(-) diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index fa64b0b612fd..4271ef3c2afb 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -1432,6 +1432,7 @@ union bpf_attr { __u32 attach_flags; __aligned_u64 prog_ids; __u32 prog_cnt; + __aligned_u64 prog_attach_flags; /* output: per-program attach_flags */ } query; struct { /* anonymous struct used by BPF_RAW_TRACEPOINT_OPEN command */ @@ -5996,6 +5997,8 @@ struct bpf_prog_info { __u64 run_cnt; __u64 recursion_misses; __u32 verified_insns; + __u32 attach_btf_obj_id; + __u32 attach_btf_id; } __attribute__((aligned(8))); struct bpf_map_info { diff --git a/kernel/bpf/cgroup.c b/kernel/bpf/cgroup.c index a27a6a7bd852..cb3338ef01e0 100644 --- a/kernel/bpf/cgroup.c +++ b/kernel/bpf/cgroup.c @@ -1035,6 +1035,7 @@ static int cgroup_bpf_detach(struct cgroup *cgrp, struct bpf_prog *prog, static int __cgroup_bpf_query(struct cgroup *cgrp, const union bpf_attr *attr, union bpf_attr __user *uattr) { + __u32 __user *prog_attach_flags = u64_to_user_ptr(attr->query.prog_attach_flags); __u32 __user *prog_ids = u64_to_user_ptr(attr->query.prog_ids); enum bpf_attach_type type = attr->query.attach_type; enum cgroup_bpf_attach_type atype; @@ -1042,50 +1043,92 @@ static int __cgroup_bpf_query(struct cgroup *cgrp, const union bpf_attr *attr, struct hlist_head *progs; struct bpf_prog *prog; int cnt, ret = 0, i; + int total_cnt = 0; u32 flags; - atype = to_cgroup_bpf_attach_type(type); - if (atype < 0) - return -EINVAL; + enum cgroup_bpf_attach_type from_atype, to_atype; - progs = &cgrp->bpf.progs[atype]; - flags = cgrp->bpf.flags[atype]; + if (type == BPF_LSM_CGROUP) { + from_atype = CGROUP_LSM_START; + to_atype = CGROUP_LSM_END; + } else { + from_atype = to_cgroup_bpf_attach_type(type); + if (from_atype < 0) + return -EINVAL; + to_atype = from_atype; + } - effective = rcu_dereference_protected(cgrp->bpf.effective[atype], - lockdep_is_held(&cgroup_mutex)); + for (atype = from_atype; atype <= to_atype; atype++) { + progs = &cgrp->bpf.progs[atype]; + flags = cgrp->bpf.flags[atype]; - if (attr->query.query_flags & BPF_F_QUERY_EFFECTIVE) - cnt = bpf_prog_array_length(effective); - else - cnt = prog_list_length(progs); + effective = rcu_dereference_protected(cgrp->bpf.effective[atype], + lockdep_is_held(&cgroup_mutex)); - if (copy_to_user(&uattr->query.attach_flags, &flags, sizeof(flags))) - return -EFAULT; - if (copy_to_user(&uattr->query.prog_cnt, &cnt, sizeof(cnt))) + if (attr->query.query_flags & BPF_F_QUERY_EFFECTIVE) + total_cnt += bpf_prog_array_length(effective); + else + total_cnt += prog_list_length(progs); + } + + if (type != BPF_LSM_CGROUP) + if (copy_to_user(&uattr->query.attach_flags, &flags, sizeof(flags))) + return -EFAULT; + if (copy_to_user(&uattr->query.prog_cnt, &total_cnt, sizeof(total_cnt))) return -EFAULT; - if (attr->query.prog_cnt == 0 || !prog_ids || !cnt) + if (attr->query.prog_cnt == 0 || !prog_ids || !total_cnt) /* return early if user requested only program count + flags */ return 0; - if (attr->query.prog_cnt < cnt) { - cnt = attr->query.prog_cnt; + + if (attr->query.prog_cnt < total_cnt) { + total_cnt = attr->query.prog_cnt; ret = -ENOSPC; } - if (attr->query.query_flags & BPF_F_QUERY_EFFECTIVE) { - return bpf_prog_array_copy_to_user(effective, prog_ids, cnt); - } else { - struct bpf_prog_list *pl; - u32 id; + for (atype = from_atype; atype <= to_atype; atype++) { + if (total_cnt <= 0) + break; - i = 0; - hlist_for_each_entry(pl, progs, node) { - prog = prog_list_prog(pl); - id = prog->aux->id; - if (copy_to_user(prog_ids + i, &id, sizeof(id))) - return -EFAULT; - if (++i == cnt) - break; + progs = &cgrp->bpf.progs[atype]; + flags = cgrp->bpf.flags[atype]; + + effective = rcu_dereference_protected(cgrp->bpf.effective[atype], + lockdep_is_held(&cgroup_mutex)); + + if (attr->query.query_flags & BPF_F_QUERY_EFFECTIVE) + cnt = bpf_prog_array_length(effective); + else + cnt = prog_list_length(progs); + + if (cnt >= total_cnt) + cnt = total_cnt; + + if (attr->query.query_flags & BPF_F_QUERY_EFFECTIVE) { + ret = bpf_prog_array_copy_to_user(effective, prog_ids, cnt); + } else { + struct bpf_prog_list *pl; + u32 id; + + i = 0; + hlist_for_each_entry(pl, progs, node) { + prog = prog_list_prog(pl); + id = prog->aux->id; + if (copy_to_user(prog_ids + i, &id, sizeof(id))) + return -EFAULT; + if (++i == cnt) + break; + } } + + if (prog_attach_flags) + for (i = 0; i < cnt; i++) + if (copy_to_user(prog_attach_flags + i, &flags, sizeof(flags))) + return -EFAULT; + + prog_ids += cnt; + total_cnt -= cnt; + if (prog_attach_flags) + prog_attach_flags += cnt; } return ret; } diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index a237be4f8bb3..27492d44133f 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -3520,7 +3520,7 @@ static int bpf_prog_detach(const union bpf_attr *attr) } } -#define BPF_PROG_QUERY_LAST_FIELD query.prog_cnt +#define BPF_PROG_QUERY_LAST_FIELD query.prog_attach_flags static int bpf_prog_query(const union bpf_attr *attr, union bpf_attr __user *uattr) @@ -3556,6 +3556,7 @@ static int bpf_prog_query(const union bpf_attr *attr, case BPF_CGROUP_SYSCTL: case BPF_CGROUP_GETSOCKOPT: case BPF_CGROUP_SETSOCKOPT: + case BPF_LSM_CGROUP: return cgroup_bpf_prog_query(attr, uattr); case BPF_LIRC_MODE2: return lirc_prog_query(attr, uattr); @@ -4066,6 +4067,9 @@ static int bpf_prog_get_info_by_fd(struct file *file, if (prog->aux->btf) info.btf_id = btf_obj_id(prog->aux->btf); + info.attach_btf_id = prog->aux->attach_btf_id; + if (prog->aux->attach_btf) + info.attach_btf_obj_id = btf_obj_id(prog->aux->attach_btf); ulen = info.nr_func_info; info.nr_func_info = prog->aux->func_info_cnt; -- 2.36.1.255.ge46751e96f-goog