From nobody Sat Nov 1 22:27:51 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 15275634266961015.6002048785987; Mon, 28 May 2018 20:10:26 -0700 (PDT) Received: from localhost ([::1]:58715 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fNV1h-0008Kj-LQ for importer@patchew.org; Mon, 28 May 2018 23:10:21 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:34845) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fNV0l-0007x5-Ez for qemu-devel@nongnu.org; Mon, 28 May 2018 23:09:24 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fNV0k-0007DU-Eu for qemu-devel@nongnu.org; Mon, 28 May 2018 23:09:23 -0400 Received: from [45.249.212.35] (port=39425 helo=huawei.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fNV0f-00077V-L7; Mon, 28 May 2018 23:09:17 -0400 Received: from DGGEMS402-HUB.china.huawei.com (unknown [172.30.72.60]) by Forcepoint Email with ESMTP id 38C7653540BA6; Tue, 29 May 2018 11:09:12 +0800 (CST) Received: from HGHY1Z002260041.china.huawei.com (10.177.16.142) by DGGEMS402-HUB.china.huawei.com (10.3.19.202) with Microsoft SMTP Server id 14.3.382.0; Tue, 29 May 2018 11:09:05 +0800 From: Shannon Zhao To: Date: Tue, 29 May 2018 11:08:03 +0800 Message-ID: <1527563283-13148-1-git-send-email-zhaoshenglong@huawei.com> X-Mailer: git-send-email 1.9.0.msysgit.0 MIME-Version: 1.0 X-Originating-IP: [10.177.16.142] X-CFilter-Loop: Reflected Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 45.249.212.35 Subject: [Qemu-devel] [PATCH v2] ARM: ACPI: Fix use-after-free due to memory realloc 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: Shannon Zhao , peter.maydell@linaro.org, shannon.zhaosl@gmail.com, qemu-devel@nongnu.org, eric.auger@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Type: text/plain; charset="utf-8" acpi_data_push uses g_array_set_size to resize the memory size. If there is no enough contiguous memory, the address will be changed. So previous pointer could not be used any more. It must update the pointer and use the new one. Reviewed-by: Eric Auger Reviewed-by: Philippe Mathieu-Daud=C3=A9 Signed-off-by: Shannon Zhao --- V2: add comments for iort_node_offset and reviewed tags --- hw/arm/virt-acpi-build.c | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-) diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c index 92ceee9..6209138 100644 --- a/hw/arm/virt-acpi-build.c +++ b/hw/arm/virt-acpi-build.c @@ -400,7 +400,7 @@ build_iort(GArray *table_data, BIOSLinker *linker, Virt= MachineState *vms) AcpiIortItsGroup *its; AcpiIortTable *iort; AcpiIortSmmu3 *smmu; - size_t node_size, iort_length, smmu_offset =3D 0; + size_t node_size, iort_node_offset, iort_length, smmu_offset =3D 0; AcpiIortRC *rc; =20 iort =3D acpi_data_push(table_data, sizeof(*iort)); @@ -415,6 +415,12 @@ build_iort(GArray *table_data, BIOSLinker *linker, Vir= tMachineState *vms) iort->node_count =3D cpu_to_le32(nb_nodes); iort->node_offset =3D cpu_to_le32(sizeof(*iort)); =20 + /* + * Use a copy in case table_data->data moves duringa acpi_data_push + * operations. + */ + iort_node_offset =3D sizeof(*iort); + /* ITS group node */ node_size =3D sizeof(*its) + sizeof(uint32_t); iort_length +=3D node_size; @@ -429,7 +435,7 @@ build_iort(GArray *table_data, BIOSLinker *linker, Virt= MachineState *vms) int irq =3D vms->irqmap[VIRT_SMMU]; =20 /* SMMUv3 node */ - smmu_offset =3D iort->node_offset + node_size; + smmu_offset =3D iort_node_offset + node_size; node_size =3D sizeof(*smmu) + sizeof(*idmap); iort_length +=3D node_size; smmu =3D acpi_data_push(table_data, node_size); @@ -450,7 +456,7 @@ build_iort(GArray *table_data, BIOSLinker *linker, Virt= MachineState *vms) idmap->id_count =3D cpu_to_le32(0xFFFF); idmap->output_base =3D 0; /* output IORT node is the ITS group node (the first node) */ - idmap->output_reference =3D cpu_to_le32(iort->node_offset); + idmap->output_reference =3D cpu_to_le32(iort_node_offset); } =20 /* Root Complex Node */ @@ -479,9 +485,14 @@ build_iort(GArray *table_data, BIOSLinker *linker, Vir= tMachineState *vms) idmap->output_reference =3D cpu_to_le32(smmu_offset); } else { /* output IORT node is the ITS group node (the first node) */ - idmap->output_reference =3D cpu_to_le32(iort->node_offset); + idmap->output_reference =3D cpu_to_le32(iort_node_offset); } =20 + /* + * Update the pointer address in case table_data->data moves during ab= ove + * acpi_data_push operations. + */ + iort =3D (AcpiIortTable *)(table_data->data + iort_start); iort->length =3D cpu_to_le32(iort_length); =20 build_header(linker, table_data, (void *)(table_data->data + iort_star= t), --=20 2.0.4