Blob Blame History Raw
From abf79316045a3c634e9633553942763fd358f9b2 Mon Sep 17 00:00:00 2001
From: Kevin Wolf <kwolf@redhat.com>
Date: Tue, 25 Mar 2014 14:23:18 +0100
Subject: [PATCH 11/49] bochs: Use unsigned variables for offsets and sizes (CVE-2014-0147)
RH-Author: Kevin Wolf <kwolf@redhat.com>
Message-id: <1395753835-7591-12-git-send-email-kwolf@redhat.com>
Patchwork-id: n/a
O-Subject: [virt-devel] [EMBARGOED RHEL-7.0 qemu-kvm PATCH 11/48] bochs: Use unsigned variables for offsets and sizes (CVE-2014-0147)
Bugzilla: 1079339
RH-Acked-by: Jeff Cody <jcody@redhat.com>
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1079339
Upstream status: Embargoed
Gets us rid of integer overflows resulting in negative sizes which
aren't correctly checked.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
---
block/bochs.c | 16 ++++++++--------
tests/qemu-iotests/078 | 8 ++++++++
tests/qemu-iotests/078.out | 4 ++++
3 files changed, 20 insertions(+), 8 deletions(-)
diff --git a/block/bochs.c b/block/bochs.c
index 708780d..04cca71 100644
--- a/block/bochs.c
+++ b/block/bochs.c
@@ -67,13 +67,13 @@ struct bochs_header {
typedef struct BDRVBochsState {
CoMutex lock;
uint32_t *catalog_bitmap;
- int catalog_size;
+ uint32_t catalog_size;
- int data_offset;
+ uint32_t data_offset;
- int bitmap_blocks;
- int extent_blocks;
- int extent_size;
+ uint32_t bitmap_blocks;
+ uint32_t extent_blocks;
+ uint32_t extent_size;
} BDRVBochsState;
static int bochs_probe(const uint8_t *buf, int buf_size, const char *filename)
@@ -97,7 +97,7 @@ static int bochs_open(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
{
BDRVBochsState *s = bs->opaque;
- int i;
+ uint32_t i;
struct bochs_header bochs;
int ret;
@@ -152,8 +152,8 @@ fail:
static int64_t seek_to_sector(BlockDriverState *bs, int64_t sector_num)
{
BDRVBochsState *s = bs->opaque;
- int64_t offset = sector_num * 512;
- int64_t extent_index, extent_offset, bitmap_offset;
+ uint64_t offset = sector_num * 512;
+ uint64_t extent_index, extent_offset, bitmap_offset;
char bitmap_entry;
// seek to sector
diff --git a/tests/qemu-iotests/078 b/tests/qemu-iotests/078
index f55f46d..73b573a 100755
--- a/tests/qemu-iotests/078
+++ b/tests/qemu-iotests/078
@@ -42,11 +42,19 @@ _supported_fmt bochs
_supported_proto generic
_supported_os Linux
+catalog_size_offset=$((0x48))
+
echo
echo "== Read from a valid image =="
_use_sample_img empty.bochs.bz2
{ $QEMU_IO -c "read 0 512" $TEST_IMG; } 2>&1 | _filter_qemu_io | _filter_testdir
+echo
+echo "== Negative catalog size =="
+_use_sample_img empty.bochs.bz2
+poke_file "$TEST_IMG" "$catalog_size_offset" "\xff\xff\xff\xff"
+{ $QEMU_IO -c "read 0 512" $TEST_IMG; } 2>&1 | _filter_qemu_io | _filter_testdir
+
# success, all done
echo "*** done"
rm -f $seq.full
diff --git a/tests/qemu-iotests/078.out b/tests/qemu-iotests/078.out
index 25d37c5..ef8c42d 100644
--- a/tests/qemu-iotests/078.out
+++ b/tests/qemu-iotests/078.out
@@ -3,4 +3,8 @@ QA output created by 078
== Read from a valid image ==
read 512/512 bytes at offset 0
512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+== Negative catalog size ==
+qemu-io: can't open device TEST_DIR/empty.bochs: Could not open 'TEST_DIR/empty.bochs': Interrupted system call
+no file open, try 'help open'
*** done
--
1.7.1