From patchwork Tue Dec 1 21:58:59 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roman Gushchin X-Patchwork-Id: 336627 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=-20.2 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=unavailable 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 8D7EDC8301D for ; Tue, 1 Dec 2020 22:00:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2FAE020870 for ; Tue, 1 Dec 2020 22:00:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=fb.com header.i=@fb.com header.b="hNHHawKF" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730428AbgLAWAi (ORCPT ); Tue, 1 Dec 2020 17:00:38 -0500 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:31944 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390834AbgLAWAA (ORCPT ); Tue, 1 Dec 2020 17:00:00 -0500 Received: from pps.filterd (m0148461.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 0B1Lmm79007452 for ; Tue, 1 Dec 2020 13:59:19 -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=24D1A31iiLby+l3GEeR9u+37xYe3bhclp43RJZPc4/w=; b=hNHHawKFKx8bUn0xU7+2x4bXLKGWfFLNgrtz8eSpiwK5HVO92lUboCAE6KYL99sIsUwe 1Nq3bM4Um8TdTWucPjgyksWo+lOfdmXui1gSZXhRd5N1l2YJVu8T4IudgQ2VRexHmHDU P1micM/je+fO3IUbkasP9ZHmDEJBDAWhSYI= Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com with ESMTP id 3547psq7tb-6 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Tue, 01 Dec 2020 13:59:19 -0800 Received: from intmgw001.41.prn1.facebook.com (2620:10d:c085:208::f) by mail.thefacebook.com (2620:10d:c085:11d::4) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1979.3; Tue, 1 Dec 2020 13:59:11 -0800 Received: by devvm3388.prn0.facebook.com (Postfix, from userid 111017) id DD29A19702E0; Tue, 1 Dec 2020 13:59:06 -0800 (PST) From: Roman Gushchin To: CC: , , , , , , , Subject: [PATCH bpf-next v9 33/34] bpf: eliminate rlimit-based memory accounting for bpf progs Date: Tue, 1 Dec 2020 13:58:59 -0800 Message-ID: <20201201215900.3569844-34-guro@fb.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20201201215900.3569844-1-guro@fb.com> References: <20201201215900.3569844-1-guro@fb.com> 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=2020-12-01_11:2020-11-30,2020-12-01 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 impostorscore=0 mlxscore=0 malwarescore=0 spamscore=0 priorityscore=1501 bulkscore=0 mlxlogscore=999 adultscore=0 suspectscore=38 lowpriorityscore=0 phishscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2012010131 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Do not use rlimit-based memory accounting for bpf progs. It has been replaced with memcg-based memory accounting. Signed-off-by: Roman Gushchin Acked-by: Song Liu --- include/linux/bpf.h | 11 ------- kernel/bpf/core.c | 12 ++------ kernel/bpf/syscall.c | 69 +++++++------------------------------------- 3 files changed, 12 insertions(+), 80 deletions(-) diff --git a/include/linux/bpf.h b/include/linux/bpf.h index 61331a148cde..a9de5711b23f 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -1202,8 +1202,6 @@ void bpf_prog_sub(struct bpf_prog *prog, int i); void bpf_prog_inc(struct bpf_prog *prog); struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog); void bpf_prog_put(struct bpf_prog *prog); -int __bpf_prog_charge(struct user_struct *user, u32 pages); -void __bpf_prog_uncharge(struct user_struct *user, u32 pages); void __bpf_free_used_maps(struct bpf_prog_aux *aux, struct bpf_map **used_maps, u32 len); @@ -1512,15 +1510,6 @@ bpf_prog_inc_not_zero(struct bpf_prog *prog) return ERR_PTR(-EOPNOTSUPP); } -static inline int __bpf_prog_charge(struct user_struct *user, u32 pages) -{ - return 0; -} - -static inline void __bpf_prog_uncharge(struct user_struct *user, u32 pages) -{ -} - static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type, const struct bpf_link_ops *ops, struct bpf_prog *prog) diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c index 2921f58c03a8..261f8692d0d2 100644 --- a/kernel/bpf/core.c +++ b/kernel/bpf/core.c @@ -221,23 +221,15 @@ struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size, { gfp_t gfp_flags = GFP_KERNEL_ACCOUNT | __GFP_ZERO | gfp_extra_flags; struct bpf_prog *fp; - u32 pages, delta; - int ret; + u32 pages; size = round_up(size, PAGE_SIZE); pages = size / PAGE_SIZE; if (pages <= fp_old->pages) return fp_old; - delta = pages - fp_old->pages; - ret = __bpf_prog_charge(fp_old->aux->user, delta); - if (ret) - return NULL; - fp = __vmalloc(size, gfp_flags); - if (fp == NULL) { - __bpf_prog_uncharge(fp_old->aux->user, delta); - } else { + if (fp) { memcpy(fp, fp_old, fp_old->pages * PAGE_SIZE); fp->pages = pages; fp->aux->prog = fp; diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 29096d96d989..d16dd4945100 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -1632,51 +1632,6 @@ static void bpf_audit_prog(const struct bpf_prog *prog, unsigned int op) audit_log_end(ab); } -int __bpf_prog_charge(struct user_struct *user, u32 pages) -{ - unsigned long memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; - unsigned long user_bufs; - - if (user) { - user_bufs = atomic_long_add_return(pages, &user->locked_vm); - if (user_bufs > memlock_limit) { - atomic_long_sub(pages, &user->locked_vm); - return -EPERM; - } - } - - return 0; -} - -void __bpf_prog_uncharge(struct user_struct *user, u32 pages) -{ - if (user) - atomic_long_sub(pages, &user->locked_vm); -} - -static int bpf_prog_charge_memlock(struct bpf_prog *prog) -{ - struct user_struct *user = get_current_user(); - int ret; - - ret = __bpf_prog_charge(user, prog->pages); - if (ret) { - free_uid(user); - return ret; - } - - prog->aux->user = user; - return 0; -} - -static void bpf_prog_uncharge_memlock(struct bpf_prog *prog) -{ - struct user_struct *user = prog->aux->user; - - __bpf_prog_uncharge(user, prog->pages); - free_uid(user); -} - static int bpf_prog_alloc_id(struct bpf_prog *prog) { int id; @@ -1726,7 +1681,7 @@ static void __bpf_prog_put_rcu(struct rcu_head *rcu) kvfree(aux->func_info); kfree(aux->func_info_aux); - bpf_prog_uncharge_memlock(aux->prog); + free_uid(aux->user); security_bpf_prog_free(aux); bpf_prog_free(aux->prog); } @@ -2164,7 +2119,7 @@ static int bpf_prog_load(union bpf_attr *attr, union bpf_attr __user *uattr) dst_prog = bpf_prog_get(attr->attach_prog_fd); if (IS_ERR(dst_prog)) { err = PTR_ERR(dst_prog); - goto free_prog_nouncharge; + goto free_prog; } prog->aux->dst_prog = dst_prog; } @@ -2174,18 +2129,15 @@ static int bpf_prog_load(union bpf_attr *attr, union bpf_attr __user *uattr) err = security_bpf_prog_alloc(prog->aux); if (err) - goto free_prog_nouncharge; - - err = bpf_prog_charge_memlock(prog); - if (err) - goto free_prog_sec; + goto free_prog; + prog->aux->user = get_current_user(); prog->len = attr->insn_cnt; err = -EFAULT; if (copy_from_user(prog->insns, u64_to_user_ptr(attr->insns), bpf_prog_insn_size(prog)) != 0) - goto free_prog; + goto free_prog_sec; prog->orig_prog = NULL; prog->jited = 0; @@ -2196,19 +2148,19 @@ static int bpf_prog_load(union bpf_attr *attr, union bpf_attr __user *uattr) if (bpf_prog_is_dev_bound(prog->aux)) { err = bpf_prog_offload_init(prog, attr); if (err) - goto free_prog; + goto free_prog_sec; } /* find program type: socket_filter vs tracing_filter */ err = find_prog_type(type, prog); if (err < 0) - goto free_prog; + goto free_prog_sec; prog->aux->load_time = ktime_get_boottime_ns(); err = bpf_obj_name_cpy(prog->aux->name, attr->prog_name, sizeof(attr->prog_name)); if (err < 0) - goto free_prog; + goto free_prog_sec; /* run eBPF verifier */ err = bpf_check(&prog, attr, uattr); @@ -2253,11 +2205,10 @@ static int bpf_prog_load(union bpf_attr *attr, union bpf_attr __user *uattr) */ __bpf_prog_put_noref(prog, prog->aux->func_cnt); return err; -free_prog: - bpf_prog_uncharge_memlock(prog); free_prog_sec: + free_uid(prog->aux->user); security_bpf_prog_free(prog->aux); -free_prog_nouncharge: +free_prog: bpf_prog_free(prog); return err; }