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=-19.0 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=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 17E30C4360C for ; Thu, 29 Apr 2021 22:08:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 009A761462 for ; Thu, 29 Apr 2021 22:08:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229708AbhD2WJb (ORCPT ); Thu, 29 Apr 2021 18:09:31 -0400 Received: from smtp-fw-2101.amazon.com ([72.21.196.25]:24137 "EHLO smtp-fw-2101.amazon.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229693AbhD2WJ3 (ORCPT ); Thu, 29 Apr 2021 18:09:29 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1619734122; x=1651270122; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=bj41Hniah88XAmhB33NNmctPpgRkHvdRoVif0YjQVN0=; b=fg43ID5+zo5LjtoOHwDtrRL/PIXF/owR7lak1irieL/7G0UhTwc/iFRa F8Kgw4LBKvwazZIQXqhDN71jVBkHaVeSxaR/ihBCMmoTQi0Bqj4M8GJFZ T6oKHuYtT37jrOkqGSdqMszevYhxLkVaIbFos0XOEDH1Hx3jeNdM72sje o=; X-IronPort-AV: E=Sophos;i="5.82,260,1613433600"; d="scan'208";a="106383180" Received: from iad12-co-svc-p1-lb1-vlan2.amazon.com (HELO email-inbound-relay-2b-4ff6265a.us-west-2.amazon.com) ([10.43.8.2]) by smtp-border-fw-2101.iad2.amazon.com with ESMTP; 29 Apr 2021 22:08:41 +0000 Received: from EX13MTAUEA002.ant.amazon.com (pdx1-ws-svc-p6-lb9-vlan3.pdx.amazon.com [10.236.137.198]) by email-inbound-relay-2b-4ff6265a.us-west-2.amazon.com (Postfix) with ESMTPS id 9F240A22F6; Thu, 29 Apr 2021 22:08:40 +0000 (UTC) Received: from EX13D10UEA004.ant.amazon.com (10.43.61.69) by EX13MTAUEA002.ant.amazon.com (10.43.61.77) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 29 Apr 2021 22:08:40 +0000 Received: from EX13MTAUEA002.ant.amazon.com (10.43.61.77) by EX13D10UEA004.ant.amazon.com (10.43.61.69) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 29 Apr 2021 22:08:40 +0000 Received: from dev-dsk-fllinden-2c-d7720709.us-west-2.amazon.com (172.19.206.175) by mail-relay.amazon.com (10.43.61.169) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Thu, 29 Apr 2021 22:08:40 +0000 Received: by dev-dsk-fllinden-2c-d7720709.us-west-2.amazon.com (Postfix, from userid 6262777) id D252297E; Thu, 29 Apr 2021 22:08:39 +0000 (UTC) From: Frank van der Linden To: CC: Subject: [PATCH 5.4 1/8] bpf: Move off_reg into sanitize_ptr_alu Date: Thu, 29 Apr 2021 22:08:32 +0000 Message-ID: <20210429220839.15667-2-fllinden@amazon.com> X-Mailer: git-send-email 2.23.4 In-Reply-To: <20210429220839.15667-1-fllinden@amazon.com> References: <20210429220839.15667-1-fllinden@amazon.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Daniel Borkmann commit 6f55b2f2a1178856c19bbce2f71449926e731914 upstream. Small refactor to drag off_reg into sanitize_ptr_alu(), so we later on can use off_reg for generalizing some of the checks for all pointer types. Signed-off-by: Daniel Borkmann Reviewed-by: John Fastabend Acked-by: Alexei Starovoitov --- kernel/bpf/verifier.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index ab2a4b7dfca5..b776aa0d8864 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -4336,11 +4336,12 @@ static int sanitize_val_alu(struct bpf_verifier_env *env, static int sanitize_ptr_alu(struct bpf_verifier_env *env, struct bpf_insn *insn, const struct bpf_reg_state *ptr_reg, - struct bpf_reg_state *dst_reg, - bool off_is_neg) + const struct bpf_reg_state *off_reg, + struct bpf_reg_state *dst_reg) { struct bpf_verifier_state *vstate = env->cur_state; struct bpf_insn_aux_data *aux = cur_aux(env); + bool off_is_neg = off_reg->smin_value < 0; bool ptr_is_dst_reg = ptr_reg == dst_reg; u8 opcode = BPF_OP(insn->code); u32 alu_state, alu_limit; @@ -4474,7 +4475,7 @@ static int adjust_ptr_min_max_vals(struct bpf_verifier_env *env, switch (opcode) { case BPF_ADD: - ret = sanitize_ptr_alu(env, insn, ptr_reg, dst_reg, smin_val < 0); + ret = sanitize_ptr_alu(env, insn, ptr_reg, off_reg, dst_reg); if (ret < 0) { verbose(env, "R%d tried to add from different maps, paths, or prohibited types\n", dst); return ret; @@ -4529,7 +4530,7 @@ static int adjust_ptr_min_max_vals(struct bpf_verifier_env *env, } break; case BPF_SUB: - ret = sanitize_ptr_alu(env, insn, ptr_reg, dst_reg, smin_val < 0); + ret = sanitize_ptr_alu(env, insn, ptr_reg, off_reg, dst_reg); if (ret < 0) { verbose(env, "R%d tried to sub from different maps, paths, or prohibited types\n", dst); return ret; -- 2.23.3