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From 95b523f48df55dfd60229d2573385828a884aa7c Mon Sep 17 00:00:00 2001
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From: Jeff Cody <jcody@redhat.com>
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Date: Tue, 25 Mar 2014 14:23:25 +0100
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Subject: [PATCH 18/49] vhdx: Bounds checking for block_size and logical_sector_size (CVE-2014-0148)
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RH-Author: Kevin Wolf <kwolf@redhat.com>
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Message-id: <1395753835-7591-19-git-send-email-kwolf@redhat.com>
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Patchwork-id: n/a
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O-Subject: [virt-devel] [EMBARGOED RHEL-7.0 qemu-kvm PATCH 18/48] vhdx: Bounds checking for block_size and logical_sector_size (CVE-2014-0148)
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Bugzilla: 1079346
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RH-Acked-by: Jeff Cody <jcody@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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From: Jeff Cody <jcody@redhat.com>
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1079346
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Upstream status: Embargoed
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Other variables (e.g. sectors_per_block) are calculated using these
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variables, and if not range-checked illegal values could be obtained
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causing infinite loops and other potential issues when calculating
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BAT entries.
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The 1.00 VHDX spec requires BlockSize to be min 1MB, max 256MB.
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LogicalSectorSize is required to be either 512 or 4096 bytes.
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Reported-by: Kevin Wolf <kwolf@redhat.com>
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Signed-off-by: Jeff Cody <jcody@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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---
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block/vhdx.c | 12 ++++++++++--
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1 files changed, 10 insertions(+), 2 deletions(-)
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diff --git a/block/vhdx.c b/block/vhdx.c
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index 1995778..66a25c9 100644
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--- a/block/vhdx.c
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+++ b/block/vhdx.c
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@@ -785,12 +785,20 @@ static int vhdx_parse_metadata(BlockDriverState *bs, BDRVVHDXState *s)
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le32_to_cpus(&s->logical_sector_size);
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le32_to_cpus(&s->physical_sector_size);
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- if (s->logical_sector_size == 0 || s->params.block_size == 0) {
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+ if (s->params.block_size < VHDX_BLOCK_SIZE_MIN ||
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+ s->params.block_size > VHDX_BLOCK_SIZE_MAX) {
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ret = -EINVAL;
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goto exit;
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}
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- /* both block_size and sector_size are guaranteed powers of 2 */
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+ /* only 2 supported sector sizes */
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+ if (s->logical_sector_size != 512 && s->logical_sector_size != 4096) {
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+ ret = -EINVAL;
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+ goto exit;
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+ }
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+
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+ /* Both block_size and sector_size are guaranteed powers of 2, below.
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+ Due to range checks above, s->sectors_per_block can never be < 256 */
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s->sectors_per_block = s->params.block_size / s->logical_sector_size;
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s->chunk_ratio = (VHDX_MAX_SECTORS_PER_BLOCK) *
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(uint64_t)s->logical_sector_size /
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--
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1.7.1
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