From patchwork Wed Nov 17 12:35:33 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= X-Patchwork-Id: 12624493 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 89C21C433F5 for ; Wed, 17 Nov 2021 12:36:49 +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 08DB261B95 for ; Wed, 17 Nov 2021 12:36:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 08DB261B95 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=nongnu.org Received: from localhost ([::1]:54964 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mnKBD-00087W-TF for qemu-devel@archiver.kernel.org; Wed, 17 Nov 2021 07:36:47 -0500 Received: from eggs.gnu.org ([209.51.188.92]:52806) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mnKAK-0006Pl-Uq for qemu-devel@nongnu.org; Wed, 17 Nov 2021 07:35:52 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:47893) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mnKAJ-0004bD-Cc for qemu-devel@nongnu.org; Wed, 17 Nov 2021 07:35:52 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1637152550; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=oTNtSt9bkGOnttpG0XfMFr62z7chItuoyRUPlpke2UQ=; b=Jtrm/c5y6njjMsv0W4KZDNmWbp0cKFvLEDekgRNYMTAUSSpFJYHii2AYrxwEcaxsU6dr6E yYF3qAA0AWyb5cIlZ/AaCjACRvkD0PkoJakl4a25k7pro7F8BEylxUg5E8jegvbaH+YvNp n8R1q7hfZU593djafuh6PEbRAUXz+6Y= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-47-HthrIJ8RMNaxLZRmV7nltA-1; Wed, 17 Nov 2021 07:35:47 -0500 X-MC-Unique: HthrIJ8RMNaxLZRmV7nltA-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 3947B8799F0; Wed, 17 Nov 2021 12:35:46 +0000 (UTC) Received: from x1w.redhat.com (unknown [10.40.192.245]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 664CC3AEF; Wed, 17 Nov 2021 12:35:42 +0000 (UTC) From: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= To: qemu-devel@nongnu.org Subject: [PATCH-for-6.2 v2 1/2] hw/nvme/ctrl: Fix buffer overrun in nvme_changed_nslist (CVE-2021-3947) Date: Wed, 17 Nov 2021 13:35:33 +0100 Message-Id: <20211117123534.2900334-2-philmd@redhat.com> In-Reply-To: <20211117123534.2900334-1-philmd@redhat.com> References: <20211117123534.2900334-1-philmd@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=philmd@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=170.10.129.124; envelope-from=philmd@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -34 X-Spam_score: -3.5 X-Spam_bar: --- X-Spam_report: (-3.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.701, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Gaurav Kamathe , qemu-block@nongnu.org, Qiuhao Li , qemu-stable@nongnu.org, Klaus Jensen , Keith Busch , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Both 'buf_len' and 'off' arguments are under guest control. Since nvme_c2h() doesn't check out of boundary access, the caller must check for eventual buffer overrun on 'trans_len'. Cc: qemu-stable@nongnu.org Reported-by: Qiuhao Li Fixes: f432fdfa121 ("support changed namespace asynchronous event") Signed-off-by: Philippe Mathieu-Daudé --- hw/nvme/ctrl.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/hw/nvme/ctrl.c b/hw/nvme/ctrl.c index 6a571d18cfa..93a24464647 100644 --- a/hw/nvme/ctrl.c +++ b/hw/nvme/ctrl.c @@ -4168,8 +4168,11 @@ static uint16_t nvme_changed_nslist(NvmeCtrl *n, uint8_t rae, uint32_t buf_len, int i = 0; uint32_t nsid; - memset(nslist, 0x0, sizeof(nslist)); trans_len = MIN(sizeof(nslist) - off, buf_len); + if (trans_len >= sizeof(nslist)) { + return NVME_INVALID_FIELD | NVME_DNR; + } + memset(nslist, 0x0, sizeof(nslist)); while ((nsid = find_first_bit(n->changed_nsids, NVME_CHANGED_NSID_SIZE)) != NVME_CHANGED_NSID_SIZE) {