From patchwork Tue Nov 3 07:46:02 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alex Chen X-Patchwork-Id: 316334 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=-11.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_SANE_1 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 96DEBC2D0A3 for ; Tue, 3 Nov 2020 07:47:42 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 18ECA2222B for ; Tue, 3 Nov 2020 07:47:40 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 18ECA2222B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:59552 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kZr2a-000868-0e for qemu-devel@archiver.kernel.org; Tue, 03 Nov 2020 02:47:40 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:38826) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kZr1S-0007Ur-PA; Tue, 03 Nov 2020 02:46:30 -0500 Received: from szxga05-in.huawei.com ([45.249.212.191]:2432) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kZr1N-0006Ty-Hs; Tue, 03 Nov 2020 02:46:30 -0500 Received: from DGGEMS408-HUB.china.huawei.com (unknown [172.30.72.60]) by szxga05-in.huawei.com (SkyGuard) with ESMTP id 4CQMKX00fgzLqYl; Tue, 3 Nov 2020 15:46:07 +0800 (CST) Received: from [10.174.187.138] (10.174.187.138) by DGGEMS408-HUB.china.huawei.com (10.3.19.208) with Microsoft SMTP Server id 14.3.487.0; Tue, 3 Nov 2020 15:46:03 +0800 Message-ID: <5FA10ABA.1080109@huawei.com> Date: Tue, 3 Nov 2020 15:46:02 +0800 From: AlexChen User-Agent: Mozilla/5.0 (Windows NT 6.2; WOW64; rv:17.0) Gecko/20130509 Thunderbird/17.0.6 MIME-Version: 1.0 To: Subject: [PATCH] target/microblaze: Fix possible array out of bounds in mmu_write() X-Originating-IP: [10.174.187.138] X-CFilter-Loop: Reflected Received-SPF: pass client-ip=45.249.212.191; envelope-from=alex.chen@huawei.com; helo=szxga05-in.huawei.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/11/02 20:52:53 X-ACL-Warn: Detected OS = Linux 3.1-3.10 [fuzzy] X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: QEMU Trivial , qemu-devel@nongnu.org, zhang.zhanghailiang@huawei.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The size of env->mmu.regs is 3, but the range of 'rn' is [0, 5]. To avoid data access out of bounds, only if 'rn' is less than 3, we can print env->mmu.regs[rn]. In other cases, we can print env->mmu.regs[MMU_R_TLBX]. Reported-by: Euler Robot Signed-off-by: Alex Chen Reviewed-by: Thomas Huth Reviewed-by: Edgar E. Iglesias --- target/microblaze/mmu.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/target/microblaze/mmu.c b/target/microblaze/mmu.c index 1dbbb271c4..917ad6d69e 100644 --- a/target/microblaze/mmu.c +++ b/target/microblaze/mmu.c @@ -234,7 +234,8 @@ void mmu_write(CPUMBState *env, bool ext, uint32_t rn, uint32_t v) unsigned int i; qemu_log_mask(CPU_LOG_MMU, - "%s rn=%d=%x old=%x\n", __func__, rn, v, env->mmu.regs[rn]); + "%s rn=%d=%x old=%x\n", __func__, rn, v, + rn < 3 ? env->mmu.regs[rn] : env->mmu.regs[MMU_R_TLBX]); if (cpu->cfg.mmu < 2 || !cpu->cfg.mmu_tlb_access) { qemu_log_mask(LOG_GUEST_ERROR, "MMU access on MMU-less system\n");