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 X-Spam-Level: X-Spam-Status: No, score=-13.6 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 959AEC4727C for ; Tue, 29 Sep 2020 09:31:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3685A20897 for ; Tue, 29 Sep 2020 09:31:23 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=cloudflare.com header.i=@cloudflare.com header.b="wSf3pUEw" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728166AbgI2JbV (ORCPT ); Tue, 29 Sep 2020 05:31:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46674 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728112AbgI2JbM (ORCPT ); Tue, 29 Sep 2020 05:31:12 -0400 Received: from mail-wr1-x441.google.com (mail-wr1-x441.google.com [IPv6:2a00:1450:4864:20::441]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1A934C0613D4 for ; Tue, 29 Sep 2020 02:31:09 -0700 (PDT) Received: by mail-wr1-x441.google.com with SMTP id g4so4565631wrs.5 for ; Tue, 29 Sep 2020 02:31:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cloudflare.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=LTVgpGq4LLRpZSsnAEZ8quGTs1OVPgk5ISC/KzU0WmI=; b=wSf3pUEw/Xo8Yo4QcjUMz5uvYca/gasUtpYXNJ+HlLUHwJ2w47KOF7O2zbnmOp07s/ xVDSkbUTexSgR365m7fe+s6QEwlg6Y5RjnNe6KvO3WncTS36hanrjZN4xC6nmuKTCc2D VYjzZGELIKPAbI5sgdqnKZgrV30We47veR+1w= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=LTVgpGq4LLRpZSsnAEZ8quGTs1OVPgk5ISC/KzU0WmI=; b=MuJiPDEljuyqiKsh7fs2lefiUWC6n7UL9JK5W876zahhofIHepeoM2np9OdXT40veQ 3HMCpCYgIXbGbg67ibj+QCcBn1Xs5w6iP+BRgFZfyI0xX7aNeBqLlp3h3D1Ikc6d+c6O oIOWiMW9esm5pT7yTwVXn648IRbrM/rVkNiA8D7akq8MAiW0wdMb07UqMGEVk766p/f0 MWmGcnY/7GLt2z8vZpRiJju5F9wOHVr58x7+CkETBxjFnFxWH05qz2zqazbLMq0tv6EI p0Z9oE11UOy3xdyWalPfCX+zRbCJCDyGQzh9RbagSJoH/7XbVA7iSpI5v0ZkvkgjGzGm 4INg== X-Gm-Message-State: AOAM530IrRDghld06IjFRmaGfPLfvAbPoJ9meRFGLedCCZewdj+EdsRD +vmHDIgwm6ORj31ZeVc619tfkg== X-Google-Smtp-Source: ABdhPJzNBJUbFcS3QxH2peWbETwJQ7UhwILzJSiAYhpNbKbUOrFixUtOc7+Cc64raXOoQQqcANIbaw== X-Received: by 2002:adf:b74a:: with SMTP id n10mr3081077wre.140.1601371867720; Tue, 29 Sep 2020 02:31:07 -0700 (PDT) Received: from antares.lan (1.f.1.6.a.e.6.5.a.0.3.2.4.7.4.0.f.f.6.2.a.5.a.7.0.b.8.0.1.0.0.2.ip6.arpa. [2001:8b0:7a5a:26ff:474:230a:56ea:61f1]) by smtp.gmail.com with ESMTPSA id i16sm5246798wrq.73.2020.09.29.02.31.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 29 Sep 2020 02:31:06 -0700 (PDT) From: Lorenz Bauer To: kafai@fb.com, Alexei Starovoitov , Daniel Borkmann , John Fastabend , Jakub Sitnicki , Lorenz Bauer , "David S. Miller" , Jakub Kicinski Cc: kernel-team@cloudflare.com, netdev@vger.kernel.org, bpf@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH bpf-next v3 1/4] bpf: sockmap: enable map_update_elem from bpf_iter Date: Tue, 29 Sep 2020 10:30:36 +0100 Message-Id: <20200929093039.73872-2-lmb@cloudflare.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200929093039.73872-1-lmb@cloudflare.com> References: <20200929093039.73872-1-lmb@cloudflare.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Allow passing a pointer to a BTF struct sock_common* when updating a sockmap or sockhash. Since BTF pointers can fault and therefore be NULL at runtime we need to add an additional !sk check to sock_map_update_elem. Since we may be passed a request or timewait socket we also need to check sk_fullsock. Doing this allows calling map_update_elem on sockmap from bpf_iter context, which uses BTF pointers. Signed-off-by: Lorenz Bauer Acked-by: Martin KaFai Lau --- kernel/bpf/verifier.c | 2 +- net/core/sock_map.c | 3 +++ 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index b25ba989c2dc..cc9c90d74dc1 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -3943,7 +3943,7 @@ static int resolve_map_arg_type(struct bpf_verifier_env *env, case BPF_MAP_TYPE_SOCKMAP: case BPF_MAP_TYPE_SOCKHASH: if (*arg_type == ARG_PTR_TO_MAP_VALUE) { - *arg_type = ARG_PTR_TO_SOCKET; + *arg_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON; } else { verbose(env, "invalid arg_type for sockmap/sockhash\n"); return -EINVAL; diff --git a/net/core/sock_map.c b/net/core/sock_map.c index e1f05e3fa1d0..08bc86f51593 100644 --- a/net/core/sock_map.c +++ b/net/core/sock_map.c @@ -610,6 +610,9 @@ static int sock_map_update_elem(struct bpf_map *map, void *key, struct sock *sk = (struct sock *)value; int ret; + if (unlikely(!sk || !sk_fullsock(sk))) + return -EINVAL; + if (!sock_map_sk_is_suitable(sk)) return -EOPNOTSUPP; -- 2.25.1