From patchwork Mon Nov 5 16:37:12 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kevin Wolf X-Patchwork-Id: 150213 Delivered-To: patch@linaro.org Received: by 2002:a2e:299d:0:0:0:0:0 with SMTP id p29-v6csp2827254ljp; Mon, 5 Nov 2018 08:45:50 -0800 (PST) X-Google-Smtp-Source: AJdET5efwxSUDLDhAx82BPTf1RUci/9SAFPcORVen8eVyNGEMLzja91HoVRK2FqVUdf39h8ts7JT X-Received: by 2002:a37:5108:: with SMTP id f8-v6mr20208219qkb.288.1541436350242; Mon, 05 Nov 2018 08:45:50 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1541436350; cv=none; d=google.com; s=arc-20160816; b=Zjlel6XRwiiMjqUOy5ALUv7C1LuYp1ZdcSfZQNsrL8QZLtV30We0yOwpSLtkq8sCg+ UcQQTMRWYqkpu9DgqWdAJB0Vas2GdGnvXHm3CcKrV3o/9KipFsNnQ5MPpz3Hw0bpoMk4 rMKyIV+JPRPBXfeevgNd6+XQrVPg8kOFvcBKr4Sg34quY2g5XNUVZPzicqfWKy7Glzi4 kePAJ3AtfKhi2xTQ2p1xvzbf8Mx44QlYmOf8n3oupTtGHR0KHvD+kdEqefRz9lNs/kDd kIodJzVSKvS4sDsVbr+euvVxbmMW/EynkYYKaHssgYMIYAjSW3H9w55kZ6ZYgvlvdDre 2J1w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=sender:errors-to:cc:list-subscribe:list-help:list-post:list-archive :list-unsubscribe:list-id:precedence:subject :content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:to:from; bh=EIgzGSJtbELCvYpUPB63uB1dSMrQB2hpBA1fKHNKGbk=; b=Dh3AJo42Q4WlJPytre5KOn9+3vkSNd8JM4mcJZjy/HHAPtem9rY3NZrl/SU8pw/BRT WfoMJTx2zj/oIjCu+IbUFwLuh8CRZFGOAuGNdi4yuSjKYnsDgj7qpk5MtVCMhiE+oeZV QmDif+auauw02hNsLx+MPmLQdzXyMRfbRR5KzAcccG4p3V2p0viDYL7mEVl8cqqwfg28 yYJs1Tf1lA9DoH/xqTJdABVMYcY8RGRkVDH8g7AhLvntGvX2RcxQ3aGI9tQ/kPI8diZt vCZYQFB3J+QC9hwr815j3sJcMd6+4aPfOAmaFCLaq2q3HsYwSMKgCIs18+ND6fm2ZNpp hF4w== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 2001:4830:134:3::11 as permitted sender) smtp.mailfrom="qemu-devel-bounces+patch=linaro.org@nongnu.org"; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org. [2001:4830:134:3::11]) by mx.google.com with ESMTPS id h2-v6si5654180qkd.169.2018.11.05.08.45.50 for (version=TLS1 cipher=AES128-SHA bits=128/128); Mon, 05 Nov 2018 08:45:50 -0800 (PST) Received-SPF: pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 2001:4830:134:3::11 as permitted sender) client-ip=2001:4830:134:3::11; Authentication-Results: mx.google.com; spf=pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 2001:4830:134:3::11 as permitted sender) smtp.mailfrom="qemu-devel-bounces+patch=linaro.org@nongnu.org"; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from localhost ([::1]:36205 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gJi0b-0001Hy-Mv for patch@linaro.org; Mon, 05 Nov 2018 11:45:49 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:50373) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gJhtJ-0006x5-8P for qemu-devel@nongnu.org; Mon, 05 Nov 2018 11:38:22 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gJhtH-0003V3-As for qemu-devel@nongnu.org; Mon, 05 Nov 2018 11:38:17 -0500 Received: from mx1.redhat.com ([209.132.183.28]:36318) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gJht2-0002Xx-KB; Mon, 05 Nov 2018 11:38:01 -0500 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 86ECB3091751; Mon, 5 Nov 2018 16:37:57 +0000 (UTC) Received: from linux.fritz.box.com (ovpn-117-198.ams2.redhat.com [10.36.117.198]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6754560C46; Mon, 5 Nov 2018 16:37:56 +0000 (UTC) From: Kevin Wolf To: qemu-block@nongnu.org Date: Mon, 5 Nov 2018 17:37:12 +0100 Message-Id: <20181105163744.25139-5-kwolf@redhat.com> In-Reply-To: <20181105163744.25139-1-kwolf@redhat.com> References: <20181105163744.25139-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.41]); Mon, 05 Nov 2018 16:37:57 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL 04/36] block/qcow2: Don't take address of fields in packed structs X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, peter.maydell@linaro.org, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: "Qemu-devel" From: Peter Maydell Taking the address of a field in a packed struct is a bad idea, because it might not be actually aligned enough for that pointer type (and thus cause a crash on dereference on some host architectures). Newer versions of clang warn about this. Avoid the bug by not using the "modify in place" byte swapping functions. There are a few places where the in-place swap function is used on something other than a packed struct field; we convert those anyway, for consistency. This patch was produced with the following spatch script (and hand-editing to fold a few resulting overlength lines): @@ expression E; @@ -be16_to_cpus(&E); +E = be16_to_cpu(E); @@ expression E; @@ -be32_to_cpus(&E); +E = be32_to_cpu(E); @@ expression E; @@ -be64_to_cpus(&E); +E = be64_to_cpu(E); @@ expression E; @@ -cpu_to_be16s(&E); +E = cpu_to_be16(E); @@ expression E; @@ -cpu_to_be32s(&E); +E = cpu_to_be32(E); @@ expression E; @@ -cpu_to_be64s(&E); +E = cpu_to_be64(E); Signed-off-by: Peter Maydell Reviewed-by: Richard Henderson Tested-by: John Snow Reviewed-by: John Snow Signed-off-by: Kevin Wolf --- block/qcow2.c | 64 +++++++++++++++++++++++++++------------------------ 1 file changed, 34 insertions(+), 30 deletions(-) -- 2.19.1 diff --git a/block/qcow2.c b/block/qcow2.c index 30689b7688..de94b290e6 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -210,8 +210,8 @@ static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset, "pread fail from offset %" PRIu64, offset); return 1; } - be32_to_cpus(&ext.magic); - be32_to_cpus(&ext.len); + ext.magic = be32_to_cpu(ext.magic); + ext.len = be32_to_cpu(ext.len); offset += sizeof(ext); #ifdef DEBUG_EXT printf("ext.magic = 0x%x\n", ext.magic); @@ -279,8 +279,8 @@ static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset, "Unable to read CRYPTO header extension"); return ret; } - be64_to_cpus(&s->crypto_header.offset); - be64_to_cpus(&s->crypto_header.length); + s->crypto_header.offset = be64_to_cpu(s->crypto_header.offset); + s->crypto_header.length = be64_to_cpu(s->crypto_header.length); if ((s->crypto_header.offset % s->cluster_size) != 0) { error_setg(errp, "Encryption header offset '%" PRIu64 "' is " @@ -342,9 +342,11 @@ static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset, return -EINVAL; } - be32_to_cpus(&bitmaps_ext.nb_bitmaps); - be64_to_cpus(&bitmaps_ext.bitmap_directory_size); - be64_to_cpus(&bitmaps_ext.bitmap_directory_offset); + bitmaps_ext.nb_bitmaps = be32_to_cpu(bitmaps_ext.nb_bitmaps); + bitmaps_ext.bitmap_directory_size = + be64_to_cpu(bitmaps_ext.bitmap_directory_size); + bitmaps_ext.bitmap_directory_offset = + be64_to_cpu(bitmaps_ext.bitmap_directory_offset); if (bitmaps_ext.nb_bitmaps > QCOW2_MAX_BITMAPS) { error_setg(errp, @@ -1159,19 +1161,20 @@ static int coroutine_fn qcow2_do_open(BlockDriverState *bs, QDict *options, error_setg_errno(errp, -ret, "Could not read qcow2 header"); goto fail; } - be32_to_cpus(&header.magic); - be32_to_cpus(&header.version); - be64_to_cpus(&header.backing_file_offset); - be32_to_cpus(&header.backing_file_size); - be64_to_cpus(&header.size); - be32_to_cpus(&header.cluster_bits); - be32_to_cpus(&header.crypt_method); - be64_to_cpus(&header.l1_table_offset); - be32_to_cpus(&header.l1_size); - be64_to_cpus(&header.refcount_table_offset); - be32_to_cpus(&header.refcount_table_clusters); - be64_to_cpus(&header.snapshots_offset); - be32_to_cpus(&header.nb_snapshots); + header.magic = be32_to_cpu(header.magic); + header.version = be32_to_cpu(header.version); + header.backing_file_offset = be64_to_cpu(header.backing_file_offset); + header.backing_file_size = be32_to_cpu(header.backing_file_size); + header.size = be64_to_cpu(header.size); + header.cluster_bits = be32_to_cpu(header.cluster_bits); + header.crypt_method = be32_to_cpu(header.crypt_method); + header.l1_table_offset = be64_to_cpu(header.l1_table_offset); + header.l1_size = be32_to_cpu(header.l1_size); + header.refcount_table_offset = be64_to_cpu(header.refcount_table_offset); + header.refcount_table_clusters = + be32_to_cpu(header.refcount_table_clusters); + header.snapshots_offset = be64_to_cpu(header.snapshots_offset); + header.nb_snapshots = be32_to_cpu(header.nb_snapshots); if (header.magic != QCOW_MAGIC) { error_setg(errp, "Image is not in qcow2 format"); @@ -1207,11 +1210,12 @@ static int coroutine_fn qcow2_do_open(BlockDriverState *bs, QDict *options, header.refcount_order = 4; header.header_length = 72; } else { - be64_to_cpus(&header.incompatible_features); - be64_to_cpus(&header.compatible_features); - be64_to_cpus(&header.autoclear_features); - be32_to_cpus(&header.refcount_order); - be32_to_cpus(&header.header_length); + header.incompatible_features = + be64_to_cpu(header.incompatible_features); + header.compatible_features = be64_to_cpu(header.compatible_features); + header.autoclear_features = be64_to_cpu(header.autoclear_features); + header.refcount_order = be32_to_cpu(header.refcount_order); + header.header_length = be32_to_cpu(header.header_length); if (header.header_length < 104) { error_setg(errp, "qcow2 header too short"); @@ -1400,7 +1404,7 @@ static int coroutine_fn qcow2_do_open(BlockDriverState *bs, QDict *options, goto fail; } for(i = 0;i < s->l1_size; i++) { - be64_to_cpus(&s->l1_table[i]); + s->l1_table[i] = be64_to_cpu(s->l1_table[i]); } } @@ -2392,13 +2396,13 @@ int qcow2_update_header(BlockDriverState *bs) /* Full disk encryption header pointer extension */ if (s->crypto_header.offset != 0) { - cpu_to_be64s(&s->crypto_header.offset); - cpu_to_be64s(&s->crypto_header.length); + s->crypto_header.offset = cpu_to_be64(s->crypto_header.offset); + s->crypto_header.length = cpu_to_be64(s->crypto_header.length); ret = header_ext_add(buf, QCOW2_EXT_MAGIC_CRYPTO_HEADER, &s->crypto_header, sizeof(s->crypto_header), buflen); - be64_to_cpus(&s->crypto_header.offset); - be64_to_cpus(&s->crypto_header.length); + s->crypto_header.offset = be64_to_cpu(s->crypto_header.offset); + s->crypto_header.length = be64_to_cpu(s->crypto_header.length); if (ret < 0) { goto fail; }