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authorChunqiang Tang <ctang@us.ibm.com>2011-02-03 10:12:49 -0500
committerKevin Wolf <kwolf@redhat.com>2011-02-10 13:23:44 +0100
commite0d9c6f93729c9bfc98fcafcd73098bb8e131aeb (patch)
tree3fb49fe18a687f023bb5eb1e7a662109b625a46c /qemu-common.h
parent982aa95532a3a7b549695d5b3e18442975eecfb5 (diff)
QCOW2: bug fix - read base image beyond its size
This patch fixes the following bug in QCOW2. For a QCOW2 image that is larger than its base image, when handling a read request straddling over the end of the base image, the QCOW2 driver attempts to read beyond the end of the base image and the request would fail. This bug was found by Fast Virtual Disk (FVD)'s fully automated testing tool. The following test triggered the bug. dd if=/dev/zero of=/var/ramdisk/truth.raw count=0 bs=1 seek=1098561536 dd if=/dev/zero of=/var/ramdisk/zero-500M.raw count=0 bs=1 seek=593099264 ./qemu-img create -f qcow2 -ocluster_size=65536,backing_fmt=blksim -b /var/ramdisk/zero-500M.raw /var/ramdisk/test.qcow2 1098561536 ./qemu-io --auto --seed=30477694 --truth=/var/ramdisk/truth.raw --format=qcow2 --test=blksim:/var/ramdisk/test.qcow2 --verify_write=true --compare_before=false --compare_after=true --round=100000 --parallel=100 --io_size=10485760 --fail_prob=0 --cancel_prob=0 --instant_qemubh=true Signed-off-by: Chunqiang Tang <ctang@us.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'qemu-common.h')
-rw-r--r--qemu-common.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/qemu-common.h b/qemu-common.h
index c7ff280b9..cb4b7e0d3 100644
--- a/qemu-common.h
+++ b/qemu-common.h
@@ -322,6 +322,8 @@ void qemu_iovec_reset(QEMUIOVector *qiov);
void qemu_iovec_to_buffer(QEMUIOVector *qiov, void *buf);
void qemu_iovec_from_buffer(QEMUIOVector *qiov, const void *buf, size_t count);
void qemu_iovec_memset(QEMUIOVector *qiov, int c, size_t count);
+void qemu_iovec_memset_skip(QEMUIOVector *qiov, int c, size_t count,
+ size_t skip);
struct Monitor;
typedef struct Monitor Monitor;