Date: Tue, 13 May 2014 16:16:25 +0530 (IST) From: P J P <ppandit@...hat.com> To: oss security list <oss-security@...ts.openwall.com> Subject: CVE-2014-0222 Qemu: qcow1: Validate L2 table size Hello, 'CVE-2014-0222' has been assigned to this issue. Too large L2 table sizes cause unbounded allocations. Images actually created by qemu-img only have 512 byte or 4k L2 tables. To keep things consistent with cluster sizes, allow ranges between 512 bytes and 64k (in fact, down to 1 entry = 8 bytes is technically working, but L2 table sizes smaller than a cluster don't make a lot of sense). This also means that the number of bytes on the virtual disk that are described by the same L2 table is limited to at most 8k * 64k or 2^29, preventively avoiding any integer overflows. Upstream fix: ------------- -> https://lists.gnu.org/archive/html/qemu-devel/2014-05/msg02155.html Thank you. -- Prasad J Pandit / Red Hat Security Response Team
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