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=-16.5 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 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 AD4FEC433ED for ; Thu, 13 May 2021 17:45:47 +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 5A4FF613CB for ; Thu, 13 May 2021 17:45:47 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5A4FF613CB Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:45814 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lhFP8-0007Rf-0Z for qemu-devel@archiver.kernel.org; Thu, 13 May 2021 13:45:46 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:54896) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lhFHx-0006Ns-DQ for qemu-devel@nongnu.org; Thu, 13 May 2021 13:38:21 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:59073) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lhFHu-0001Li-TO for qemu-devel@nongnu.org; Thu, 13 May 2021 13:38:21 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1620927498; 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=N6AzTdnRYxTl7m0CkaAnuyH7/tpU16ehHQFiuHVFeEI=; b=h+NwUggXtxY6BXojjdqLm7jzvPNoyryKTZHctNHFyc4obiTplDnIht4F1+ClLHv9QabY41 sokiXXorQXiJEo9BBS9QQ1lHiJfb93cbV2WYG+LcZDrz7c9jzVfRA/dak2tmwGR6O3OlCq WPlB9sAJEplavF8YJGscxsnQLgYACy0= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-417-WzJ4j2wbOauL_oWUc5iafQ-1; Thu, 13 May 2021 13:38:14 -0400 X-MC-Unique: WzJ4j2wbOauL_oWUc5iafQ-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id C0F0F801817; Thu, 13 May 2021 17:38:12 +0000 (UTC) Received: from dgilbert-t580.localhost (ovpn-113-200.ams2.redhat.com [10.36.113.200]) by smtp.corp.redhat.com (Postfix) with ESMTP id 290485D6AC; Thu, 13 May 2021 17:38:11 +0000 (UTC) From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, david@redhat.com, zhukeqian1@huawei.com, jiangkunkun@huawei.com, armbru@redhat.com, peter.maydell@linaro.org, huangy81@chinatelecom.cn Subject: [PULL 09/17] exec: Relax range check in ram_block_discard_range() Date: Thu, 13 May 2021 18:37:29 +0100 Message-Id: <20210513173737.279402-10-dgilbert@redhat.com> In-Reply-To: <20210513173737.279402-1-dgilbert@redhat.com> References: <20210513173737.279402-1-dgilbert@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dgilbert@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="US-ASCII" Received-SPF: pass client-ip=216.205.24.124; envelope-from=dgilbert@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=-0.699, 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=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: peterx@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: David Hildenbrand We want to make use of ram_block_discard_range() in the RAM block resize callback when growing a RAM block, *before* used_length is changed. Let's relax the check. As RAM blocks always mmap the whole max_length area, we cannot corrupt unrelated data. Reviewed-by: Peter Xu Signed-off-by: David Hildenbrand Message-Id: <20210429112708.12291-6-david@redhat.com> Signed-off-by: Dr. David Alan Gilbert --- softmmu/physmem.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/softmmu/physmem.c b/softmmu/physmem.c index 813a3efe8e..e1da81ed2f 100644 --- a/softmmu/physmem.c +++ b/softmmu/physmem.c @@ -3500,7 +3500,7 @@ int ram_block_discard_range(RAMBlock *rb, uint64_t start, size_t length) goto err; } - if ((start + length) <= rb->used_length) { + if ((start + length) <= rb->max_length) { bool need_madvise, need_fallocate; if (!QEMU_IS_ALIGNED(length, rb->page_size)) { error_report("ram_block_discard_range: Unaligned length: %zx", @@ -3567,7 +3567,7 @@ int ram_block_discard_range(RAMBlock *rb, uint64_t start, size_t length) } else { error_report("ram_block_discard_range: Overrun block '%s' (%" PRIu64 "/%zx/" RAM_ADDR_FMT")", - rb->idstr, start, length, rb->used_length); + rb->idstr, start, length, rb->max_length); } err: -- 2.31.1