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block/parallels: check new image size 

Before this patch incorrect image could be created via qemu-img
(Example: qemu-img create -f parallels -o size=4096T hack.img),
incorrect images cannot be used due to overflow in main image structure.

This patch add check of size in image creation.

After reading size it compare it with UINT32_MAX * cluster_size.

Signed-off-by: Klim Kireev <proffk@virtuozzo.mipt.ru>
Signed-off-by: Denis V. Lunev <den@openvz.org>
Message-id: 1469639300-12155-1-git-send-email-den@openvz.org
CC: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Klim Kireev 2016-07-27 20:08:20 +03:00 committed by Stefan Hajnoczi
parent 42e0d60f16
commit 555a608c5d
1 changed files with 5 additions and 0 deletions
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5
block/parallels.c
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@ -43,6 +43,7 @@
#define HEADER_MAGIC2 "WithouFreSpacExt"
#define HEADER_VERSION 2
#define HEADER_INUSE_MAGIC (0x746F6E59)
#define MAX_PARALLELS_IMAGE_FACTOR (1ull << 32)
#define DEFAULT_CLUSTER_SIZE 1048576 /* 1 MiB */
@ -475,6 +476,10 @@ static int parallels_create(const char *filename, QemuOpts *opts, Error **errp)
BDRV_SECTOR_SIZE);
cl_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_CLUSTER_SIZE,
DEFAULT_CLUSTER_SIZE), BDRV_SECTOR_SIZE);
if (total_size >= MAX_PARALLELS_IMAGE_FACTOR * cl_size) {
error_propagate(errp, local_err);
return -E2BIG;
}
ret = bdrv_create_file(filename, opts, &local_err);
if (ret < 0) {