From patchwork Fri May 8 23:08:18 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Collin Walling X-Patchwork-Id: 1286493 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=linux.ibm.com 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 ozlabs.org (Postfix) with ESMTPS id 49JmMm4kPMz9sNH for ; Sat, 9 May 2020 09:13:08 +1000 (AEST) Received: from localhost ([::1]:44954 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jXCB0-0001sb-9v for incoming@patchwork.ozlabs.org; Fri, 08 May 2020 19:13:06 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:53386) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jXC71-0003SG-0k; Fri, 08 May 2020 19:08:59 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:52758) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jXC6r-0005op-AI; Fri, 08 May 2020 19:08:58 -0400 Received: from pps.filterd (m0098394.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 048N1hgK004417; Fri, 8 May 2020 19:08:46 -0400 Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com with ESMTP id 30vtsf32ad-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 08 May 2020 19:08:46 -0400 Received: from m0098394.ppops.net (m0098394.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.36/8.16.0.36) with SMTP id 048N2Esn008302; Fri, 8 May 2020 19:08:45 -0400 Received: from ppma03dal.us.ibm.com (b.bd.3ea9.ip4.static.sl-reverse.com [169.62.189.11]) by mx0a-001b2d01.pphosted.com with ESMTP id 30vtsf32a2-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 08 May 2020 19:08:45 -0400 Received: from pps.filterd (ppma03dal.us.ibm.com [127.0.0.1]) by ppma03dal.us.ibm.com (8.16.0.27/8.16.0.27) with SMTP id 048N1phw001097; Fri, 8 May 2020 23:08:44 GMT Received: from b01cxnp22036.gho.pok.ibm.com (b01cxnp22036.gho.pok.ibm.com [9.57.198.26]) by ppma03dal.us.ibm.com with ESMTP id 30s0g8ay0w-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 08 May 2020 23:08:44 +0000 Received: from b01ledav006.gho.pok.ibm.com (b01ledav006.gho.pok.ibm.com [9.57.199.111]) by b01cxnp22036.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 048N8i7g15533042 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 8 May 2020 23:08:44 GMT Received: from b01ledav006.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 0D087AC05E; Fri, 8 May 2020 23:08:44 +0000 (GMT) Received: from b01ledav006.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C54F0AC05F; Fri, 8 May 2020 23:08:43 +0000 (GMT) Received: from localhost.localdomain.com (unknown [9.85.189.36]) by b01ledav006.gho.pok.ibm.com (Postfix) with ESMTP; Fri, 8 May 2020 23:08:43 +0000 (GMT) From: Collin Walling To: qemu-devel@nongnu.org, qemu-s390x@nongnu.org Subject: [PATCH v1 3/8] s390/sclp: rework sclp boundary and length checks Date: Fri, 8 May 2020 19:08:18 -0400 Message-Id: <20200508230823.22956-4-walling@linux.ibm.com> X-Mailer: git-send-email 2.21.1 In-Reply-To: <20200508230823.22956-1-walling@linux.ibm.com> References: <20200508230823.22956-1-walling@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216, 18.0.676 definitions=2020-05-08_19:2020-05-08, 2020-05-08 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 phishscore=0 bulkscore=0 impostorscore=0 malwarescore=0 clxscore=1015 mlxscore=0 lowpriorityscore=0 spamscore=0 mlxlogscore=999 priorityscore=1501 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2005080190 Received-SPF: pass client-ip=148.163.156.1; envelope-from=walling@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/08 19:08:46 X-ACL-Warn: Detected OS = Linux 3.x [generic] X-Spam_score_int: -25 X-Spam_score: -2.6 X-Spam_bar: -- X-Spam_report: (-2.6 / 5.0 requ) BAYES_00=-1.9, KHOP_DYNAMIC=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN 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: frankja@linux.ibm.com, david@redhat.com, cohuck@redhat.com, pasic@linux.ibm.com, borntraeger@de.ibm.com, mst@redhat.com, svens@linux.ibm.com, pbonzini@redhat.com, mihajlov@linux.ibm.com, rth@twiddle.net Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Let's factor out the SCLP boundary and length checks into separate functions. Signed-off-by: Collin Walling --- hw/s390x/sclp.c | 41 +++++++++++++++++++++++++++++++++++------ 1 file changed, 35 insertions(+), 6 deletions(-) diff --git a/hw/s390x/sclp.c b/hw/s390x/sclp.c index d08a291e40..470d5da7a2 100644 --- a/hw/s390x/sclp.c +++ b/hw/s390x/sclp.c @@ -49,6 +49,34 @@ static inline bool sclp_command_code_valid(uint32_t code) return false; } +static bool check_sccb_boundary_valid(uint64_t sccb_addr, uint32_t code, + SCCB *sccb) +{ + uint64_t current_len = sccb_addr + be16_to_cpu(sccb->h.length); + uint64_t allowed_len = (sccb_addr & PAGE_MASK) + PAGE_SIZE; + + switch (code & SCLP_CMD_CODE_MASK) { + default: + if (current_len <= allowed_len) { + return true; + } + } + sccb->h.response_code = cpu_to_be16(SCLP_RC_SCCB_BOUNDARY_VIOLATION); + return false; +} + +static bool check_sufficient_sccb_len(SCCB *sccb, int size) +{ + MachineState *ms = MACHINE(qdev_get_machine()); + int required_len = size + ms->possible_cpus->len * sizeof(CPUEntry); + + if (be16_to_cpu(sccb->h.length) < required_len) { + sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH); + return false; + } + return true; +} + static void prepare_cpu_entries(CPUEntry *entry, int *count) { MachineState *ms = MACHINE(qdev_get_machine()); @@ -76,8 +104,7 @@ static void read_SCP_info(SCLPDevice *sclp, SCCB *sccb) int rnsize, rnmax; IplParameterBlock *ipib = s390_ipl_get_iplb(); - if (be16_to_cpu(sccb->h.length) < (sizeof(ReadInfo) + cpu_count * sizeof(CPUEntry))) { - sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH); + if (!check_sufficient_sccb_len(sccb, sizeof(ReadInfo))) { return; } @@ -134,8 +161,7 @@ static void sclp_read_cpu_info(SCLPDevice *sclp, SCCB *sccb) ReadCpuInfo *cpu_info = (ReadCpuInfo *) sccb; int cpu_count; - if (be16_to_cpu(sccb->h.length) < (sizeof(ReadCpuInfo) + cpu_count * sizeof(CPUEntry))) { - sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH); + if (!check_sufficient_sccb_len(sccb, sizeof(ReadCpuInfo))) { return; } @@ -227,6 +253,10 @@ int sclp_service_call_protected(CPUS390XState *env, uint64_t sccb, goto out_write; } + if (!check_sccb_boundary_valid(sccb, code, &work_sccb)) { + goto out_write; + } + sclp_c->execute(sclp, &work_sccb, code); out_write: s390_cpu_pv_mem_write(env_archcpu(env), 0, &work_sccb, @@ -272,8 +302,7 @@ int sclp_service_call(CPUS390XState *env, uint64_t sccb, uint32_t code) goto out_write; } - if ((sccb + be16_to_cpu(work_sccb.h.length)) > ((sccb & PAGE_MASK) + PAGE_SIZE)) { - work_sccb.h.response_code = cpu_to_be16(SCLP_RC_SCCB_BOUNDARY_VIOLATION); + if (!check_sccb_boundary_valid(sccb, code, &work_sccb)) { goto out_write; }