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Thu, 10 Sep 2020 09:37:10 +0000 (GMT) From: Collin Walling To: qemu-devel@nongnu.org, qemu-s390x@nongnu.org Subject: [PATCH v5 2/8] s390/sclp: rework sclp boundary checks Date: Thu, 10 Sep 2020 05:36:49 -0400 Message-Id: <20200910093655.255774-3-walling@linux.ibm.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200910093655.255774-1-walling@linux.ibm.com> References: <20200910093655.255774-1-walling@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687 definitions=2020-09-10_01:2020-09-10, 2020-09-10 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 malwarescore=0 bulkscore=0 suspectscore=0 mlxscore=0 adultscore=0 clxscore=1015 priorityscore=1501 impostorscore=0 mlxlogscore=999 lowpriorityscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009100088 Received-SPF: pass client-ip=148.163.158.5; envelope-from=walling@linux.ibm.com; helo=mx0b-001b2d01.pphosted.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/10 05:37:14 X-ACL-Warn: Detected OS = Linux 3.1-3.10 X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no 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: thuth@redhat.com, frankja@linux.ibm.com, david@redhat.com, cohuck@redhat.com, pasic@linux.ibm.com, borntraeger@de.ibm.com, mst@redhat.com, pbonzini@redhat.com, sumanthk@linux.ibm.com, mihajlov@linux.ibm.com, rth@twiddle.net Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Rework the SCLP boundary check to account for different SCLP commands (eventually) allowing different boundary sizes. Signed-off-by: Collin Walling Acked-by: Janosch Frank Reviewed-by: Cornelia Huck --- hw/s390x/sclp.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-) diff --git a/hw/s390x/sclp.c b/hw/s390x/sclp.c index 28b973de8f..69a8724dc7 100644 --- a/hw/s390x/sclp.c +++ b/hw/s390x/sclp.c @@ -49,6 +49,18 @@ static inline bool sclp_command_code_valid(uint32_t code) return false; } +static bool sccb_verify_boundary(uint64_t sccb_addr, uint16_t len) +{ + uint64_t sccb_max_addr = sccb_addr + be16_to_cpu(len) - 1; + uint64_t sccb_boundary = (sccb_addr & PAGE_MASK) + PAGE_SIZE; + + if (sccb_max_addr < sccb_boundary) { + return true; + } + + return false; +} + static void prepare_cpu_entries(MachineState *ms, CPUEntry *entry, int *count) { uint8_t features[SCCB_CPU_FEATURE_LEN] = { 0 }; @@ -229,6 +241,11 @@ int sclp_service_call_protected(CPUS390XState *env, uint64_t sccb, goto out_write; } + if (!sccb_verify_boundary(sccb, work_sccb.h.length)) { + work_sccb.h.response_code = cpu_to_be16(SCLP_RC_SCCB_BOUNDARY_VIOLATION); + goto out_write; + } + sclp_c->execute(sclp, &work_sccb, code); out_write: s390_cpu_pv_mem_write(env_archcpu(env), 0, &work_sccb, @@ -274,7 +291,7 @@ 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)) { + if (!sccb_verify_boundary(sccb, work_sccb.h.length)) { work_sccb.h.response_code = cpu_to_be16(SCLP_RC_SCCB_BOUNDARY_VIOLATION); goto out_write; }