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Thu, 24 Sep 2020 08:59:41 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B62084C04A; Thu, 24 Sep 2020 08:59:40 +0000 (GMT) Received: from marcibm.ibmuc.com (unknown [9.145.161.19]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 24 Sep 2020 08:59:40 +0000 (GMT) From: Marc Hartmayer To: Subject: [PATCH 1/3] pc-bios/s390-ccw: fix off-by-one error Date: Thu, 24 Sep 2020 10:59:24 +0200 Message-Id: <20200924085926.21709-2-mhartmay@linux.ibm.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200924085926.21709-1-mhartmay@linux.ibm.com> References: <20200924085926.21709-1-mhartmay@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687 definitions=2020-09-24_05:2020-09-24, 2020-09-24 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 spamscore=0 bulkscore=0 adultscore=0 lowpriorityscore=0 priorityscore=1501 clxscore=1011 phishscore=0 mlxlogscore=992 suspectscore=1 mlxscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009240067 Received-SPF: pass client-ip=148.163.158.5; envelope-from=mhartmay@linux.ibm.com; helo=mx0b-001b2d01.pphosted.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/24 04:59:46 X-ACL-Warn: Detected OS = Linux 3.x [generic] X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, 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: Janosch Frank , qemu-s390x , Thomas Huth , "Collin L. Walling" , David Hildenbrand Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This error takes effect when the magic value "zIPL" is located at the end of a block. For example if s2_cur_blk = 0x7fe18000 and the magic value "zIPL" is located at 0x7fe18ffc - 0x7fe18fff. Fixes: ba831b25262a ("s390-ccw: read stage2 boot loader data to find menu") Reviewed-by: Collin Walling Signed-off-by: Marc Hartmayer Reviewed-by: Thomas Huth --- pc-bios/s390-ccw/bootmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/pc-bios/s390-ccw/bootmap.c b/pc-bios/s390-ccw/bootmap.c index 97205674e59a..0d29dceaa3cc 100644 --- a/pc-bios/s390-ccw/bootmap.c +++ b/pc-bios/s390-ccw/bootmap.c @@ -163,7 +163,7 @@ static bool find_zipl_boot_menu_banner(int *offset) int i; /* Menu banner starts with "zIPL" */ - for (i = 0; i < virtio_get_block_size() - 4; i++) { + for (i = 0; i < virtio_get_block_size() - 3; i++) { if (magic_match(s2_cur_blk + i, ZIPL_MAGIC_EBCDIC)) { *offset = i; return true;