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Fri, 19 Jun 2020 10:50:12 GMT Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B6E87A405F; Fri, 19 Jun 2020 10:50:12 +0000 (GMT) Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 1629EA405B; Fri, 19 Jun 2020 10:50:12 +0000 (GMT) Received: from localhost.localdomain (unknown [9.145.7.233]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 19 Jun 2020 10:50:12 +0000 (GMT) Subject: Re: [PATCH v3 3/8] s390/sclp: rework sclp boundary and length checks To: Collin Walling , qemu-devel@nongnu.org, qemu-s390x@nongnu.org References: <20200618222258.23287-1-walling@linux.ibm.com> <20200618222258.23287-4-walling@linux.ibm.com> From: Janosch Frank Autocrypt: addr=frankja@linux.ibm.com; prefer-encrypt=mutual; keydata= mQINBFubpD4BEADX0uhkRhkj2AVn7kI4IuPY3A8xKat0ihuPDXbynUC77mNox7yvK3X5QBO6 qLqYr+qrG3buymJJRD9xkp4mqgasHdB5WR9MhXWKH08EvtvAMkEJLnqxgbqf8td3pCQ2cEpv 15mH49iKSmlTcJ+PvJpGZcq/jE42u9/0YFHhozm8GfQdb9SOI/wBSsOqcXcLTUeAvbdqSBZe zuMRBivJQQI1esD9HuADmxdE7c4AeMlap9MvxvUtWk4ZJ/1Z3swMVCGzZb2Xg/9jZpLsyQzb lDbbTlEeyBACeED7DYLZI3d0SFKeJZ1SUyMmSOcr9zeSh4S4h4w8xgDDGmeDVygBQZa1HaoL Esb8Y4avOYIgYDhgkCh0nol7XQ5i/yKLtnNThubAcxNyryw1xSstnKlxPRoxtqTsxMAiSekk 0m3WJwvwd1s878HrQNK0orWd8BzzlSswzjNfQYLF466JOjHPWFOok9pzRs+ucrs6MUwDJj0S cITWU9Rxb04XyigY4XmZ8dywaxwi2ZVTEg+MD+sPmRrTw+5F+sU83cUstuymF3w1GmyofgsU Z+/ldjToHnq21MNa1wx0lCEipCCyE/8K9B9bg9pUwy5lfx7yORP3JuAUfCYb8DVSHWBPHKNj HTOLb2g2UT65AjZEQE95U2AY9iYm5usMqaWD39pAHfhC09/7NQARAQABtCVKYW5vc2NoIEZy YW5rIDxmcmFua2phQGxpbnV4LmlibS5jb20+iQI3BBMBCAAhBQJbm6Q+AhsjBQsJCAcCBhUI CQoLAgQWAgMBAh4BAheAAAoJEONU5rjiOLn4p9gQALjkdj5euJVI2nNT3/IAxAhQSmRhPEt0 AmnCYnuTcHRWPujNr5kqgtyER9+EMQ0ZkX44JU2q7OWxTdSNSAN/5Z7qmOR9JySvDOf4d3mS bMB5zxL9d8SbnSs1uW96H9ZBTlTQnmLfsiM9TetAjSrR8nUmjGhe2YUhJLR1v1LguME+YseT eXnLzIzqqpu311/eYiiIGcmaOjPCE+vFjcXL5oLnGUE73qSYiujwhfPCCUK0850o1fUAYq5p CNBCoKT4OddZR+0itKc/cT6NwEDwdokeg0+rAhxb4Rv5oFO70lziBplEjOxu3dqgIKbHbjza EXTb+mr7VI9O4tTdqrwJo2q9zLqqOfDBi7NDvZFLzaCewhbdEpDYVu6/WxprAY94hY3F4trT rQMHJKQENtF6ZTQc9fcT5I3gAmP+OEvDE5hcTALpWm6Z6SzxO7gEYCnF+qGXqp8sJVrweMub UscyLqHoqdZC2UG4LQ1OJ97nzDpIRe0g6oJ9ZIYHKmfw5jjwH6rASTld5MFWajWdNsqK15k/ RZnHAGICKVIBOBsq26m4EsBlfCdt3b/6emuBjUXR1pyjHMz2awWzCq6/6OWs5eANZ0sdosNq dq2v0ULYTazJz2rlCXV89qRa7ukkNwdBSZNEwsD4eEMicj1LSrqWDZMAALw50L4jxaMD7lPL jJbauQINBFubpD4BEADAcUTRqXF/aY53OSH7IwIK9lFKxIm0IoFkOEh7LMfp7FGzaP7ANrZd cIzhZi38xyOkcaFY+npGEWvko7rlIAn0JpBO4x3hfhmhBD/WSY8LQIFQNNjEm3vzrMo7b9Jb JAqQxfbURY3Dql3GUzeWTG9uaJ00u+EEPlY8zcVShDltIl5PLih20e8xgTnNzx5c110lQSu0 iZv2lAE6DM+2bJQTsMSYiwKlwTuv9LI9Chnoo6+tsN55NqyMxYqJgElk3VzlTXSr3+rtSCwf tq2cinETbzxc1XuhIX6pu/aCGnNfuEkM34b7G1D6CPzDMqokNFbyoO6DQ1+fW6c5gctXg/lZ 602iEl4C4rgcr3+EpfoPUWzKeM8JXv5Kpq4YDxhvbitr8Dm8gr38+UKFZKlWLlwhQ56r/zAU v6LIsm11GmFs2/cmgD1bqBTNHHcTWwWtRTLgmnqJbVisMJuYJt4KNPqphTWsPY8SEtbufIlY HXOJ2lqUzOReTrie2u0qcSvGAbSfec9apTFl2Xko/ddqPcZMpKhBiXmY8tJzSPk3+G4tqur4 6TYAm5ouitJsgAR61Cu7s+PNuq/pTLDhK+6/Njmc94NGBcRA4qTuysEGE79vYWP2oIAU4Fv6 gqaWHZ4MEI2XTqH8wiwzPdCQPYsSE0fXWiYu7ObeErT6iLSTZGx4rQARAQABiQIfBBgBCAAJ BQJbm6Q+AhsMAAoJEONU5rjiOLn4DDEP/RuyckW65SZcPG4cMfNgWxZF8rVjeVl/9PBfy01K 8R0hajU40bWtXSMiby7j0/dMjz99jN6L+AJHJvrLz4qYRzn2Ys843W+RfXj62Zde4YNBE5SL jJweRCbMWKaJLj6499fctxTyeb9+AMLQS4yRSwHuAZLmAb5AyCW1gBcTWZb8ON5BmWnRqeGm IgC1EvCnHy++aBnHTn0m+zV89BhTLTUal35tcjUFwluBY39R2ux/HNlBO1GY3Z+WYXhBvq7q katThLjaQSmnOrMhzqYmdShP1leFTVbzXUUIYv/GbynO/YrL2gaQpaP1bEUEi8lUAfXJbEWG dnHFkciryi092E8/9j89DJg4mmZqOau7TtUxjRMlBcIliXkzSLUk+QvD4LK1kWievJse4mte FBdkWHfP4BH/+8DxapRcG1UAheSnSRQ5LiO50annOB7oXF+vgKIaie2TBfZxQNGAs3RQ+bga DchCqFm5adiSP5+OT4NjkKUeGpBe/aRyQSle/RropTgCi85pje/juYEn2P9UAgkfBJrOHvQ9 Z+2Sva8FRd61NJLkCJ4LFumRn9wQlX2icFbi8UDV3do0hXJRRYTWCxrHscMhkrFWLhYiPF4i phX7UNdOWBQ90qpHyAxHmDazdo27gEjfvsgYMdveKknEOTEb5phwxWgg7BcIDoJf9UMC Message-ID: Date: Fri, 19 Jun 2020 12:50:11 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <20200618222258.23287-4-walling@linux.ibm.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="84jQrZI84VYaBTLw7F5rZSEHfFMsCsN0n" X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216, 18.0.687 definitions=2020-06-19_05:2020-06-19, 2020-06-19 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 spamscore=0 cotscore=-2147483648 clxscore=1015 malwarescore=0 impostorscore=0 bulkscore=0 mlxlogscore=999 lowpriorityscore=0 mlxscore=0 priorityscore=1501 suspectscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2006190074 Received-SPF: pass client-ip=148.163.158.5; envelope-from=frankja@linux.ibm.com; helo=mx0b-001b2d01.pphosted.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/19 06:50:18 X-ACL-Warn: Detected OS = Linux 3.1-3.10 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, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=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: thuth@redhat.com, mst@redhat.com, cohuck@redhat.com, david@redhat.com, pasic@linux.ibm.com, borntraeger@de.ibm.com, svens@linux.ibm.com, pbonzini@redhat.com, mihajlov@linux.ibm.com, rth@twiddle.net Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --84jQrZI84VYaBTLw7F5rZSEHfFMsCsN0n Content-Type: multipart/mixed; boundary="4ROME1fHcUuXiOuF1ppypvsZRiDHfwJ6M" --4ROME1fHcUuXiOuF1ppypvsZRiDHfwJ6M Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 6/19/20 12:22 AM, Collin Walling wrote: > Rework the SCLP boundary check to account for different SCLP commands > (eventually) allowing different boundary sizes. >=20 > Move the length check code into a separate function, and introduce a > new function to determine the length of the read SCP data (i.e. the siz= e > from the start of the struct to where the CPU entries should begin). >=20 > The format of read CPU info is unlikely to change in the future, > so we do not require a separate function to calculate its length. >=20 > Signed-off-by: Collin Walling Acked-by: Janosch Frank > --- [...] > +/* > + * The data length denotes the start of the struct to where the first > + * CPU entry is to be allocated. This value also denotes the offset_cp= u > + * field. > + */ > +static inline int get_read_scp_info_data_len(void) > +{ > + return offsetof(ReadInfo, entries); > +} > + > /* Provide information about the configuration, CPUs and storage */ > static void read_SCP_info(SCLPDevice *sclp, SCCB *sccb) > { > @@ -74,17 +112,16 @@ static void read_SCP_info(SCLPDevice *sclp, SCCB *= sccb) > int cpu_count; > int rnsize, rnmax; > IplParameterBlock *ipib =3D s390_ipl_get_iplb(); > + int data_len =3D get_read_scp_info_data_len(); Does somebody have a better name than data_len at hand? > =20 > - if (be16_to_cpu(sccb->h.length) < > - (sizeof(ReadInfo) + machine->possible_cpus->len * sizeof(CPU= Entry))) { > - sccb->h.response_code =3D cpu_to_be16(SCLP_RC_INSUFFICIENT_SCC= B_LENGTH); > + if (!sccb_sufficient_len(sccb, machine->possible_cpus->len, data_l= en)) { > return; > } > =20 > /* CPU information */ > prepare_cpu_entries(machine, read_info->entries, &cpu_count); > read_info->entries_cpu =3D cpu_to_be16(cpu_count); > - read_info->offset_cpu =3D cpu_to_be16(offsetof(ReadInfo, entries))= ; > + read_info->offset_cpu =3D cpu_to_be16(data_len); > read_info->highest_cpu =3D cpu_to_be16(machine->smp.max_cpus - 1);= > =20 > read_info->ibc_val =3D cpu_to_be32(s390_get_ibc_val()); > @@ -133,17 +170,16 @@ static void sclp_read_cpu_info(SCLPDevice *sclp, = SCCB *sccb) > { > MachineState *machine =3D MACHINE(qdev_get_machine()); > ReadCpuInfo *cpu_info =3D (ReadCpuInfo *) sccb; > + int data_len =3D offsetof(ReadCpuInfo, entries); > int cpu_count; > =20 > - if (be16_to_cpu(sccb->h.length) < > - (sizeof(ReadInfo) + machine->possible_cpus->len * sizeof(CPU= Entry))) { > - sccb->h.response_code =3D cpu_to_be16(SCLP_RC_INSUFFICIENT_SCC= B_LENGTH); > + if (!sccb_sufficient_len(sccb, machine->possible_cpus->len, data_l= en)) { > return; > } > =20 > prepare_cpu_entries(machine, cpu_info->entries, &cpu_count); > cpu_info->nr_configured =3D cpu_to_be16(cpu_count); > - cpu_info->offset_configured =3D cpu_to_be16(offsetof(ReadCpuInfo, = entries)); > + cpu_info->offset_configured =3D cpu_to_be16(data_len); > cpu_info->nr_standby =3D cpu_to_be16(0); > =20 > /* The standby offset is 16-byte for each CPU */ > @@ -229,6 +265,10 @@ int sclp_service_call_protected(CPUS390XState *env= , uint64_t sccb, > goto out_write; > } > =20 > + if (!sccb_has_valid_boundary(sccb, code, &work_sccb.h)) { > + goto out_write; > + } > + > sclp_c->execute(sclp, &work_sccb, code); > out_write: > s390_cpu_pv_mem_write(env_archcpu(env), 0, &work_sccb, > @@ -274,8 +314,7 @@ int sclp_service_call(CPUS390XState *env, uint64_t = sccb, uint32_t code) > goto out_write; > } > =20 > - if ((sccb + be16_to_cpu(work_sccb.h.length)) > ((sccb & PAGE_MASK)= + PAGE_SIZE)) { > - work_sccb.h.response_code =3D cpu_to_be16(SCLP_RC_SCCB_BOUNDAR= Y_VIOLATION); > + if (!sccb_has_valid_boundary(sccb, code, &work_sccb.h)) { > goto out_write; > } > =20 >=20 --4ROME1fHcUuXiOuF1ppypvsZRiDHfwJ6M-- --84jQrZI84VYaBTLw7F5rZSEHfFMsCsN0n Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEwGNS88vfc9+v45Yq41TmuOI4ufgFAl7smGMACgkQ41TmuOI4 ufgo9g/+MH+YdKKXglF99wUB+I0RaR1DeHBB7cK1Tvh8n51NFlfE14yhOtnnr17n lsoDdCS7a9MnQSkMfgy8qw+q4OVFORKsZO8My9xkFVyCor0k0hDjt0M0zTp97gDY NEcsfChl2/pcmdHEtneuGIoWJXRw9Cj2k2L0nPyTxZTQ2iIC4DLIoHjvgxK2oABQ DyCVt8HwUf35kJrYNgVM6SozuioIqT5ldJumKqKvbUUJOox/q6HswdxvjCPB2EWr Zwa8jErWsz9fx6j5qOUrzUqDYZLIVtMQLv8LKNUgb8DYctMfy5vh7ZlAvVmx6C9K GEYg89MOvxN2L42OLtB1UybFrMAh0NI8fAVt7qUT6hT2cvrFFDE3RLThwY5Gg25k l0vYwTi8KFbh1tpK2vuObfGz2rd6a4uYfn8oWeXndXYkc8N8FvJQFBfeRFVwZ2O4 Vtzk9/Dd16NSTOhY6b7WsOXJbjwq5YzWz/Z5mFoRRoLR5uBVFi7Oezo1hT0WcIVM sYF6IDOJsNuV3mUXM6PW6QVJUAFMYT8x7g58+ZkJYgeS9MsTuh6n4QWSnjmZhM3G EGruZgdPGvKm5eC4fIBXLVtrfKFZlz/fMngeYnQKe/xMjEu/r7cL2AyuPH3IBSJO fVEEMupjAbkolapBH5P9tE++zS0Wu43HwPEbCcbjNcg9eRuCufU= =asTy -----END PGP SIGNATURE----- --84jQrZI84VYaBTLw7F5rZSEHfFMsCsN0n--