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authorKlim Kireev <proffk@virtuozzo.mipt.ru>2016-07-27 20:08:20 +0300
committerStefan Hajnoczi <stefanha@redhat.com>2016-08-05 09:59:06 +0100
commit555a608c5d5dcc44e45a483ca09b449d8db519d1 (patch)
treebdab2e3440172f3bf5154f95d53db6e1b0eecb0e /block
parent42e0d60f1615ef63d16e41bb1668805560c37870 (diff)
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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>
Diffstat (limited to 'block')
-rw-r--r--block/parallels.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/block/parallels.c b/block/parallels.c
index 807a801..2ccefa7 100644
--- a/block/parallels.c
+++ b/block/parallels.c
@@ -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) {