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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Fri, 4 Oct 2019 13:04:01 +0100 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06avi18626390.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x94C3UGq30278126 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 4 Oct 2019 12:03:30 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7289C4C052; Fri, 4 Oct 2019 12:03:59 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2D0FF4C040; Fri, 4 Oct 2019 12:03:59 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.152.224.146]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 4 Oct 2019 12:03:59 +0000 (GMT) To: Stefano Garzarella , Paolo Bonzini , qemu-devel , Libvirt , Marc Hartmayer , Claudio Imbrenda From: Christian Borntraeger Subject: libvirt? qemu change that mmaps ELF files breaks libvirt svirt handling for os.kernel Openpgp: preference=signencrypt Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 x-cbid: 19100412-0016-0000-0000-000002B401A8 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19100412-0017-0000-0000-000033151125 Message-Id: X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-10-04_06:, , 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=661 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1910040112 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] [fuzzy] X-Received-From: 148.163.156.1 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: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Stefano, Paolo, I have an interesting fail in QEMU 2019-10-04T12:00:32.675188Z qemu-system-s390x: GLib: g_mapped_file_unref: assertion 'file != NULL' failed that bisected to commit 816b9fe450220e19acb91a0ce4a8ade7000648d1 (refs/bisect/bad) elf-ops.h: Map into memory the ELF to load strace tells that I can read the ELF file, but not mmap strace: 214365 openat(AT_FDCWD, "/var/lib/libvirt/images/test_cpu_timer.elf", O_RDONLY) = 36 214365 read(46, "\177ELF\2\2\1\0\0\0\0\0\0\0\0\0", 16) = 16 214365 lseek(46, 0, SEEK_SET) = 0 [...] 214365 fstat(46, {st_mode=S_IFREG|0755, st_size=168176, ...}) = 0 214365 mmap(NULL, 168176, PROT_READ|PROT_WRITE, MAP_PRIVATE, 46, 0) = -1 EACCES (Permission denied) So reading from /var/lib/libvirt/images/test_cpu_timer.elf does work, mmaping does not. setenforce 0 makes the problem go away. This might be more of an issue in libvirt, setting the svirt context too restrictive, but I am not too deep into the svirt part of libvirt. Reverting the qemu commit makes the problem go away.