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| author | Kevin Wolf <kwolf@redhat.com> | 2014-03-26 13:05:33 +0100 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2014-04-01 13:59:47 +0200 |
| commit | e3737b820b45e54b059656dc3f914f895ac7a88b (patch) | |
| tree | 2f5378471709e413a5e59a5ee85e0ea5453a7a7a /block/bochs.c | |
| parent | 246f65838d19db6db55bfb41117c35645a2c4789 (diff) | |
| download | qemu-e3737b820b45e54b059656dc3f914f895ac7a88b.zip qemu-e3737b820b45e54b059656dc3f914f895ac7a88b.tar.gz qemu-e3737b820b45e54b059656dc3f914f895ac7a88b.tar.bz2 | |
bochs: Check catalog_size header field (CVE-2014-0143)
It should neither become negative nor allow unbounded memory
allocations. This fixes aborts in g_malloc() and an s->catalog_bitmap
buffer overflow on big endian hosts.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'block/bochs.c')
| -rw-r--r-- | block/bochs.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/block/bochs.c b/block/bochs.c index e923eed..0ffa9c1 100644 --- a/block/bochs.c +++ b/block/bochs.c @@ -123,7 +123,14 @@ static int bochs_open(BlockDriverState *bs, QDict *options, int flags, bs->total_sectors = le64_to_cpu(bochs.extra.redolog.disk) / 512; } + /* Limit to 1M entries to avoid unbounded allocation. This is what is + * needed for the largest image that bximage can create (~8 TB). */ s->catalog_size = le32_to_cpu(bochs.catalog); + if (s->catalog_size > 0x100000) { + error_setg(errp, "Catalog size is too large"); + return -EFBIG; + } + s->catalog_bitmap = g_malloc(s->catalog_size * 4); ret = bdrv_pread(bs->file, le32_to_cpu(bochs.header), s->catalog_bitmap, @@ -142,6 +149,12 @@ static int bochs_open(BlockDriverState *bs, QDict *options, int flags, s->extent_size = le32_to_cpu(bochs.extent); + if (s->catalog_size < bs->total_sectors / s->extent_size) { + error_setg(errp, "Catalog size is too small for this disk size"); + ret = -EINVAL; + goto fail; + } + qemu_co_mutex_init(&s->lock); return 0; |