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Mon, 18 May 2020 08:37:07 GMT Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 54D36A4054; Mon, 18 May 2020 08:37:07 +0000 (GMT) Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8C46EA405C; Mon, 18 May 2020 08:37:06 +0000 (GMT) Received: from localhost.localdomain (unknown [9.145.44.214]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 18 May 2020 08:37:06 +0000 (GMT) Subject: Re: [PATCH v2 2/8] s390/sclp: check sccb len before filling in data To: Collin Walling , qemu-devel@nongnu.org, qemu-s390x@nongnu.org References: <20200515222032.18838-1-walling@linux.ibm.com> <20200515222032.18838-3-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: <68164af4-d7ab-2bc4-0947-5a199da93ca8@linux.ibm.com> Date: Mon, 18 May 2020 10:37:05 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2 MIME-Version: 1.0 In-Reply-To: <20200515222032.18838-3-walling@linux.ibm.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="IhUfapCqEI9Gsr4vtPcwDOm98xYuk9IED" X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216, 18.0.676 definitions=2020-05-18_02:2020-05-15, 2020-05-18 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 bulkscore=0 priorityscore=1501 cotscore=-2147483648 clxscore=1015 mlxlogscore=999 phishscore=0 suspectscore=0 mlxscore=0 impostorscore=0 lowpriorityscore=0 adultscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2005180074 Received-SPF: pass client-ip=148.163.158.5; envelope-from=frankja@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/18 04:37:13 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: thuth@redhat.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+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --IhUfapCqEI9Gsr4vtPcwDOm98xYuk9IED Content-Type: multipart/mixed; boundary="8ZUdvX8LiiU961PMAX6057J7cjcVpftCt" --8ZUdvX8LiiU961PMAX6057J7cjcVpftCt Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 5/16/20 12:20 AM, Collin Walling wrote: > The SCCB must be checked for a sufficient length before it is filled > with any data. If the length is insufficient, then the SCLP command > is suppressed and the proper response code is set in the SCCB header. >=20 > Fixes: 832be0d8a3bb ("s390x: sclp: Report insufficient SCCB length") > Signed-off-by: Collin Walling Reviewed-by: Janosch Frank > --- > hw/s390x/sclp.c | 22 ++++++++++------------ > 1 file changed, 10 insertions(+), 12 deletions(-) >=20 > diff --git a/hw/s390x/sclp.c b/hw/s390x/sclp.c > index 61e2e2839c..2bd618515e 100644 > --- a/hw/s390x/sclp.c > +++ b/hw/s390x/sclp.c > @@ -75,6 +75,11 @@ static void read_SCP_info(SCLPDevice *sclp, SCCB *sc= cb) > int rnsize, rnmax; > IplParameterBlock *ipib =3D s390_ipl_get_iplb(); > =20 > + if (be16_to_cpu(sccb->h.length) < (sizeof(ReadInfo) + cpu_count * = sizeof(CPUEntry))) { > + sccb->h.response_code =3D cpu_to_be16(SCLP_RC_INSUFFICIENT_SCC= B_LENGTH); > + return; > + } > + > /* CPU information */ > prepare_cpu_entries(machine, read_info->entries, &cpu_count); > read_info->entries_cpu =3D cpu_to_be16(cpu_count); > @@ -83,12 +88,6 @@ static void read_SCP_info(SCLPDevice *sclp, SCCB *sc= cb) > =20 > read_info->ibc_val =3D cpu_to_be32(s390_get_ibc_val()); > =20 > - if (be16_to_cpu(sccb->h.length) < > - (sizeof(ReadInfo) + cpu_count * sizeof(CPUEntry))) { > - sccb->h.response_code =3D cpu_to_be16(SCLP_RC_INSUFFICIENT_SCC= B_LENGTH); > - return; > - } > - > /* Configuration Characteristic (Extension) */ > s390_get_feat_block(S390_FEAT_TYPE_SCLP_CONF_CHAR, > read_info->conf_char); > @@ -135,17 +134,16 @@ static void sclp_read_cpu_info(SCLPDevice *sclp, = SCCB *sccb) > ReadCpuInfo *cpu_info =3D (ReadCpuInfo *) sccb; > int cpu_count; > =20 > + if (be16_to_cpu(sccb->h.length) < (sizeof(ReadCpuInfo) + cpu_count= * sizeof(CPUEntry))) { > + sccb->h.response_code =3D cpu_to_be16(SCLP_RC_INSUFFICIENT_SCC= B_LENGTH); > + return; > + } > + > 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->nr_standby =3D cpu_to_be16(0); > =20 > - if (be16_to_cpu(sccb->h.length) < > - (sizeof(ReadCpuInfo) + cpu_count * sizeof(CPUEntry))) { > - sccb->h.response_code =3D cpu_to_be16(SCLP_RC_INSUFFICIENT_SCC= B_LENGTH); > - return; > - } > - > /* The standby offset is 16-byte for each CPU */ > cpu_info->offset_standby =3D cpu_to_be16(cpu_info->offset_configur= ed > + cpu_info->nr_configured*sizeof(CPUEntry)); >=20 --8ZUdvX8LiiU961PMAX6057J7cjcVpftCt-- --IhUfapCqEI9Gsr4vtPcwDOm98xYuk9IED Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEwGNS88vfc9+v45Yq41TmuOI4ufgFAl7CSTIACgkQ41TmuOI4 ufg3pg//dUP+IMchFUVUXIQj+Jrwr90KKmU2HlXUvtFtxL4pWy1DLYuQsxY99vLV Wxfim/oadfoF5C4LlmmRsa9H+WE1f70WuiSvwV6R+hpGAhBAwlcOTHT9HaxHHymK Gl53e4bwSgwXzuy+oixOL7AFgRpLFImGwuQZ2QTbdCSZERXOrdgnTa1bQ5AQVqmL RKNE1mTePYocg6I9KKPNxW+eDmDL7qboqGTI2V5gbnSGMJThGH32IzQ08V5IJpVa EvvT6f6WH+1iql7DH0Y8JlOLcOsXH9r5d7WdJYrFkCFdlFsdV98pE/1ljOaHXfFD LrEA+tb3Ea8KHFpK60txkFCciAsqeQI7IBBxDduYqKUytgTl8jqK0n9CSiyhrM4I QOM99pLfKWC1NQJSqMAFkWZ6OZC752GcXFbyQaOyZUl12PfHoxzV4tHmuJkNC7Nb srRZgk2/gS50Z0GUM7w3ET7Ez1fQeE87H3GKIXYL/TjIJVLGDQQJ9Nn1kmkj0zUv kxmwXqly30VVa3/1GvQpk/4J6yspXPapx7cs91knBku8cdLwUWpV3TnBtYs6GkPA JzXxxLjt6lJ9KVmfgSZGEqZpCn2iA75BZBgd5O5kkPsEvp+sS3RoQJ6pSOZY1mIl 5DEJQkKLf/ZsphHCklCZMlH3SnL8urrM4N0bYLAdqKBgMuSxCmc= =Ve+w -----END PGP SIGNATURE----- --IhUfapCqEI9Gsr4vtPcwDOm98xYuk9IED--