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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Wed, 13 Feb 2019 17:29:29 -0000 Received: from b03ledav006.gho.boulder.ibm.com (b03ledav006.gho.boulder.ibm.com [9.17.130.237]) by b03cxnp08027.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x1DHTSnI34668576 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 13 Feb 2019 17:29:28 GMT Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 690A1C6057; Wed, 13 Feb 2019 17:29:28 +0000 (GMT) Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 95172C6055; Wed, 13 Feb 2019 17:29:27 +0000 (GMT) Received: from farosas.linux.ibm.com.br.ibm.com (unknown [9.18.235.171]) by b03ledav006.gho.boulder.ibm.com (Postfix) with ESMTP; Wed, 13 Feb 2019 17:29:27 +0000 (GMT) From: Fabiano Rosas To: qemu-devel@nongnu.org Date: Wed, 13 Feb 2019 15:29:26 -0200 X-Mailer: git-send-email 2.17.1 X-TM-AS-GCONF: 00 x-cbid: 19021317-8235-0000-0000-00000E5BCF31 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00010589; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000279; SDB=6.01160545; UDB=6.00605724; IPR=6.00941100; MB=3.00025564; MTD=3.00000008; XFM=3.00000015; UTC=2019-02-13 17:29:30 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19021317-8236-0000-0000-00004474990D Message-Id: <20190213172926.21740-1-farosas@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-02-13_10:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=918 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1902130124 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] [fuzzy] X-Received-From: 148.163.156.1 Subject: [Qemu-devel] [PATCH] spapr: fix out of bounds write in spapr_populate_drmem_v2 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: qemu-ppc@nongnu.org, david@gibson.dropbear.id.au Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" buf_len is uint8_t which is not large enough to hold the result of: nr_entries * sizeof(struct sPAPRDrconfCellV2) + sizeof(uint32_t); for a nr_entries greater than 10. This causes the allocated buffer 'int_buf' to be smaller than expected and we eventually overwrite some of glibc's control structures (see "chunk" in https://sourceware.org/glibc/wiki/MallocInternals) The following error is seen while trying to free int_buf: "free(): invalid next size (fast)" Fixes: a324d6f166 "spapr: Support ibm,dynamic-memory-v2 property" Signed-off-by: Fabiano Rosas Reviewed-by: Greg Kurz --- hw/ppc/spapr.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index 332cba89d4..7c4bf8ed8c 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -687,14 +687,14 @@ static int spapr_populate_drmem_v2(sPAPRMachineState = *spapr, void *fdt, int offset, MemoryDeviceInfoList *dimms) { MachineState *machine =3D MACHINE(spapr); - uint8_t *int_buf, *cur_index, buf_len; + uint8_t *int_buf, *cur_index; int ret; uint64_t lmb_size =3D SPAPR_MEMORY_BLOCK_SIZE; uint64_t addr, cur_addr, size; uint32_t nr_boot_lmbs =3D (machine->device_memory->base / lmb_size); uint64_t mem_end =3D machine->device_memory->base + memory_region_size(&machine->device_memory->mr); - uint32_t node, nr_entries =3D 0; + uint32_t node, buf_len, nr_entries =3D 0; sPAPRDRConnector *drc; DrconfCellQueue *elem, *next; MemoryDeviceInfoList *info; --=20 2.17.1