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SUSE:SLE-15-SP2:Update
xen.19911
CVE-2014-0222-blktap-qcow1-validate-l2-table-si...
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File CVE-2014-0222-blktap-qcow1-validate-l2-table-size.patch of Package xen.19911
References: bsc#964925 Subject: qcow1: Validate L2 table size (CVE-2014-0222) From: Kevin Wolf kwolf@redhat.com Thu May 15 16:10:11 2014 +0200 Date: Mon May 19 11:36:49 2014 +0200: Git: 42eb58179b3b215bb507da3262b682b8a2ec10b5 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. Cc: qemu-stable@nongnu.org Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Benoit Canet <benoit@irqsave.net> Index: xen-4.6.0-testing/tools/blktap2/drivers/block-qcow.c =================================================================== --- xen-4.6.0-testing.orig/tools/blktap2/drivers/block-qcow.c +++ xen-4.6.0-testing/tools/blktap2/drivers/block-qcow.c @@ -909,6 +909,10 @@ int tdqcow_open (td_driver_t *driver, co if (header.size <= 1 || header.cluster_bits < 9) goto fail; + /* l2_bits specifies number of entries; storing a uint64_t in each entry, + * so bytes = num_entries << 3. */ + if (header.l2_bits < 9 - 3 || header.l2_bits > 16 - 3) + goto fail; if (header.crypt_method > QCOW_CRYPT_AES) goto fail; s->crypt_method_header = header.crypt_method;
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