From nobody Mon Feb 9 12:43:05 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1582303838; cv=none; d=zohomail.com; s=zohoarc; b=AuG/YMnnPec0xOUvMxJWu3iSlIJ4NMB/WNP+O9rhL47M6b5Yu+ef16uin/PuRifDkKYUFT0bpGwQoUEah8FHplbUIFutW3S42bU3YJ5n0kXpBvXQSRRPpvdj1r0/IAfa8hHLZ6hR8rWRIPRfDPwQv0jdV1vrivGQYyuzSaOF/g0= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1582303838; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=AbD2MWw/nLDVkxUemdyaLogLxwGW4nzWXsGitr5n5fs=; b=bACsWlnWL62Jm1BRMYGidPpdTtczV83xUw8CSzCWL9hxcQgiIFlWZaxs/BTcw3KWVlW1q7qhVavDu6eox6/07CwtknfgeHePByl/D4jvCm8RYQoLB3kLuZAShJhhIGBKzi3rDilt8lR09RLM7oGX78z79b6mwmJbpkvzUjOSzPI= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1582303838857663.1880241032068; Fri, 21 Feb 2020 08:50:38 -0800 (PST) Received: from localhost ([::1]:33196 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j5BVd-00039D-Mc for importer@patchew.org; Fri, 21 Feb 2020 11:50:37 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:52964) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j5BP1-0000PB-0p for qemu-devel@nongnu.org; Fri, 21 Feb 2020 11:43:47 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1j5BP0-0007AF-1A for qemu-devel@nongnu.org; Fri, 21 Feb 2020 11:43:46 -0500 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:53426 helo=us-smtp-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1j5BOz-0007A5-Tg for qemu-devel@nongnu.org; Fri, 21 Feb 2020 11:43:45 -0500 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-88-LNrgYfQrNs-tLFnWDnHEiA-1; Fri, 21 Feb 2020 11:43:43 -0500 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 8868D1400; Fri, 21 Feb 2020 16:43:42 +0000 (UTC) Received: from t480s.redhat.com (ovpn-117-197.ams2.redhat.com [10.36.117.197]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1B1A990F7C; Fri, 21 Feb 2020 16:43:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1582303425; 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=AbD2MWw/nLDVkxUemdyaLogLxwGW4nzWXsGitr5n5fs=; b=VCXVRpofGYt0lrW57zihnNHk9+Yy1NFl0UEjpuenevkMKjVs8xt/Aj5dp7QW4iQiCaitku irwePlPDf/IyoKpefZqXoytVtveIb+vmWFil+Eh3w1Xki2ls/WcIByYB0vKex0tmOzfDSi gWMw/wciTTc/oaNe/IIFlqd/jQ4VhP8= X-MC-Unique: LNrgYfQrNs-tLFnWDnHEiA-1 From: David Hildenbrand To: qemu-devel@nongnu.org Subject: [PATCH v2 12/13] migration/ram: Use offset_in_ramblock() in range checks Date: Fri, 21 Feb 2020 17:42:03 +0100 Message-Id: <20200221164204.105570-13-david@redhat.com> In-Reply-To: <20200221164204.105570-1-david@redhat.com> References: <20200221164204.105570-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 205.139.110.120 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: Eduardo Habkost , Juan Quintela , David Hildenbrand , "Dr . David Alan Gilbert" , Peter Xu , Paolo Bonzini , Richard Henderson Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" We never read or write beyond the used_length of memory blocks when migrating. Make this clearer by using offset_in_ramblock() consistently. Cc: "Dr. David Alan Gilbert" Cc: Juan Quintela Cc: Peter Xu Signed-off-by: David Hildenbrand --- migration/ram.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/migration/ram.c b/migration/ram.c index ee5c3d5784..5cc9993899 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -1309,8 +1309,8 @@ static bool find_dirty_block(RAMState *rs, PageSearch= Status *pss, bool *again) *again =3D false; return false; } - if ((((ram_addr_t)pss->page) << TARGET_PAGE_BITS) - >=3D pss->block->used_length) { + if (!offset_in_ramblock(pss->block, + ((ram_addr_t)pss->page) << TARGET_PAGE_BITS)) { /* Didn't find anything in this RAM Block */ pss->page =3D 0; pss->block =3D QLIST_NEXT_RCU(pss->block, next); @@ -1514,7 +1514,7 @@ int ram_save_queue_pages(const char *rbname, ram_addr= _t start, ram_addr_t len) rs->last_req_rb =3D ramblock; } trace_ram_save_queue_pages(ramblock->idstr, start, len); - if (start+len > ramblock->used_length) { + if (!offset_in_ramblock(ramblock, start + len - 1)) { error_report("%s request overrun start=3D" RAM_ADDR_FMT " len=3D" RAM_ADDR_FMT " blocklen=3D" RAM_ADDR_FMT, __func__, start, len, ramblock->used_length); @@ -3325,8 +3325,8 @@ static void colo_flush_ram_cache(void) while (block) { offset =3D migration_bitmap_find_dirty(ram_state, block, offse= t); =20 - if (((ram_addr_t)offset) << TARGET_PAGE_BITS - >=3D block->used_length) { + if (!offset_in_ramblock(block, + ((ram_addr_t)offset) << TARGET_PAGE_BI= TS)) { offset =3D 0; block =3D QLIST_NEXT_RCU(block, next); } else { --=20 2.24.1