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Fri, 11 Sep 2020 18:16:27 +0000 (GMT) Subject: Re: [PATCH v5 3/8] s390/sclp: read sccb from mem based on provided length From: Collin Walling To: Thomas Huth , qemu-devel@nongnu.org, qemu-s390x@nongnu.org References: <20200910093655.255774-1-walling@linux.ibm.com> <20200910093655.255774-4-walling@linux.ibm.com> <02dabe89-8df2-90d4-c7f1-5ef951942639@redhat.com> <811e906a-689e-a53c-706e-5d6217ef3cb2@linux.ibm.com> Message-ID: <2b7a8807-279f-1256-e89b-0f53ae6d5623@linux.ibm.com> Date: Fri, 11 Sep 2020 14:16:27 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <811e906a-689e-a53c-706e-5d6217ef3cb2@linux.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687 definitions=2020-09-11_08:2020-09-10, 2020-09-11 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 impostorscore=0 mlxscore=0 mlxlogscore=999 priorityscore=1501 malwarescore=0 phishscore=0 spamscore=0 suspectscore=2 clxscore=1015 bulkscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009110142 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 = 2020/09/11 09:50:13 X-ACL-Warn: Detected OS = Linux 3.x [generic] X-Spam_score_int: -51 X-Spam_score: -5.2 X-Spam_bar: ----- X-Spam_report: (-5.2 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-2.469, 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: 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 9/10/20 1:56 PM, Collin Walling wrote: > On 9/10/20 1:50 PM, Thomas Huth wrote: >> On 10/09/2020 11.36, Collin Walling wrote: >>> The header contained within the SCCB passed to the SCLP service call >>> contains the actual length of the SCCB. Instead of allocating a static >>> 4K size for the work sccb, let's allow for a variable size determined >>> by the value in the header. The proper checks are already in place to >>> ensure the SCCB length is sufficent to store a full response and that >>> the length does not cross any explicitly-set boundaries. >>> >>> Signed-off-by: Collin Walling >>> --- >>> hw/s390x/event-facility.c | 2 +- >>> hw/s390x/sclp.c | 58 ++++++++++++++++++++++----------------- >>> include/hw/s390x/sclp.h | 2 +- >>> 3 files changed, 35 insertions(+), 27 deletions(-) >>> >>> diff --git a/hw/s390x/event-facility.c b/hw/s390x/event-facility.c >>> index 645b4080c5..ed92ce510d 100644 >>> --- a/hw/s390x/event-facility.c >>> +++ b/hw/s390x/event-facility.c >>> @@ -213,7 +213,7 @@ static uint16_t handle_sccb_read_events(SCLPEventFacility *ef, SCCB *sccb, >>> >>> event_buf = &red->ebh; >>> event_buf->length = 0; >>> - slen = sizeof(sccb->data); >>> + slen = sccb_data_len(sccb); >>> >>> rc = SCLP_RC_NO_EVENT_BUFFERS_STORED; >>> >>> diff --git a/hw/s390x/sclp.c b/hw/s390x/sclp.c >>> index 69a8724dc7..cb8e2e8ec3 100644 >>> --- a/hw/s390x/sclp.c >>> +++ b/hw/s390x/sclp.c >>> @@ -231,25 +231,30 @@ int sclp_service_call_protected(CPUS390XState *env, uint64_t sccb, >>> { >>> SCLPDevice *sclp = get_sclp_device(); >>> SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp); >>> - SCCB work_sccb; >>> - hwaddr sccb_len = sizeof(SCCB); >>> + SCCBHeader header; >>> + SCCB *work_sccb; >> >> I'd maybe use "g_autofree SCCB *work_sccb = NULL" so you don't have to >> worry about doing the g_free() later. > > Can do. > >> >>> - s390_cpu_pv_mem_read(env_archcpu(env), 0, &work_sccb, sccb_len); >>> + s390_cpu_pv_mem_read(env_archcpu(env), 0, &header, sizeof(SCCBHeader)); >>> + >>> + work_sccb = g_malloc0(header.length); >> >> Please use be16_to_cpu(header.length) here as well. > > Good catch, thanks! > Shouldn't the mallocs use cpu_to_be16 instead since the header length was read in from a cpu? [...] -- Regards, Collin Stay safe and stay healthy