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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 6 May 2019 12:24:22 +0100 Received: from d06av21.portsmouth.uk.ibm.com (d06av21.portsmouth.uk.ibm.com [9.149.105.232]) by b06cxnps3075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x46BOKuJ61800472 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 6 May 2019 11:24:20 GMT Received: from d06av21.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B72B65204E; Mon, 6 May 2019 11:24:20 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.152.224.177]) by d06av21.portsmouth.uk.ibm.com (Postfix) with ESMTP id 71F4F52051; Mon, 6 May 2019 11:24:20 +0000 (GMT) To: Cornelia Huck References: <1556543381-12671-1-git-send-email-jjherne@linux.ibm.com> <55907be5-61a5-f251-4609-b0336818de17@redhat.com> <98a268ee-17fb-079e-01d1-5dc554a24efd@de.ibm.com> <20190506123414.5b33b6f8.cohuck@redhat.com> <9493076a-6bbe-21eb-4df3-2b54dc6376b9@de.ibm.com> <20190506130542.635513b1.cohuck@redhat.com> <5206e568-c85e-b918-1809-62453c03cb61@de.ibm.com> <20190506132325.7c9cf997.cohuck@redhat.com> From: Christian Borntraeger Openpgp: preference=signencrypt Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <20190506132325.7c9cf997.cohuck@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 19050611-0016-0000-0000-00000278CDCB X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19050611-0017-0000-0000-000032D571B8 Message-Id: X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-05-06_07:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=806 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1905060100 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] X-Received-From: 148.163.156.1 Subject: Re: [Qemu-devel] [qemu-s390x] [PATCH] s390-bios: Skip bootmap signature entries X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Jason J. Herne" , Thomas Huth , David Hildenbrand , alifm@linux.ibm.com, qemu-devel@nongnu.org, qemu-s390x@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 06.05.19 13:23, Cornelia Huck wrote: > On Mon, 6 May 2019 13:13:55 +0200 > Christian Borntraeger wrote: > >> On 06.05.19 13:05, Cornelia Huck wrote: >>> On Mon, 6 May 2019 12:46:50 +0200 >>> Christian Borntraeger wrote: >>> >>>> On 06.05.19 12:34, Cornelia Huck wrote: >>>>> On Mon, 6 May 2019 12:18:42 +0200 >>>>> Christian Borntraeger wrote: >>> >>>>>> I think we should not. Those entries might have sematic elements that the guest >>>>>> wants to enforce. I do not think that this will come, but imagine a boot entry >>>>>> that mandates some security wishes (e.g. do only run on non-shared cores). >>>>> >>>>> Can we split the namespace for BOOT_SCRIPT into 'ignore if you don't >>>>> know what that is' and 'fail if you don't know what that is'? I'm >>>>> completely confused how 'optional' those entries are supposed to be... >>>> >>>> Since we do not know if and what future entries will come the current default >>>> of failing seems the best approach. We can then add things to pc-bios when >>>> necessary. >>> >>> That's where I'm coming from: Have some values where unknown entries >>> lead to (desired) failure, and others where unknown entries are simply >>> ignored. That would give us automatic toleration for optional entries. >> >> Well, this is the first new entry after 14 years of list-directed-ipl so there >> is a slight chance to over-engineer here ;-) >> >> In the end this is a field that does not belong to Linux-only, it is also defined >> by the machine architecture. > > Yeah, I understand that having to get this into the main architecture > makes this harder to change. > > If there is nothing coming in the foreseeable future that would need > toleration (and not failure), it's probably not worth spending more > time on that and we should just go with this patch. > > I'd recommend putting this (+ a rebuild) into stable as well, though, > so that at least 4.0-stable will tolerate signatures. (Distros > backporting this would be a good idea as well.) Yes, that makes sense.