diff options
| -rw-r--r-- | block/vdi.c | 14 | ||||
| -rwxr-xr-x | tests/qemu-iotests/084 | 14 | ||||
| -rw-r--r-- | tests/qemu-iotests/084.out | 13 |
3 files changed, 27 insertions, 14 deletions
diff --git a/block/vdi.c b/block/vdi.c index e1d211c9f7..39070b75e8 100644 --- a/block/vdi.c +++ b/block/vdi.c @@ -120,8 +120,18 @@ typedef unsigned char uuid_t[16]; #define VDI_IS_ALLOCATED(X) ((X) < VDI_DISCARDED) -/* max blocks in image is (0xffffffff / 4) */ -#define VDI_BLOCKS_IN_IMAGE_MAX 0x3fffffff +/* The bmap will take up VDI_BLOCKS_IN_IMAGE_MAX * sizeof(uint32_t) bytes; since + * the bmap is read and written in a single operation, its size needs to be + * limited to INT_MAX; furthermore, when opening an image, the bmap size is + * rounded up to be aligned on BDRV_SECTOR_SIZE. + * Therefore this should satisfy the following: + * VDI_BLOCKS_IN_IMAGE_MAX * sizeof(uint32_t) + BDRV_SECTOR_SIZE == INT_MAX + 1 + * (INT_MAX + 1 is the first value not representable as an int) + * This guarantees that any value below or equal to the constant will, when + * multiplied by sizeof(uint32_t) and rounded up to a BDRV_SECTOR_SIZE boundary, + * still be below or equal to INT_MAX. */ +#define VDI_BLOCKS_IN_IMAGE_MAX \ + ((unsigned)((INT_MAX + 1u - BDRV_SECTOR_SIZE) / sizeof(uint32_t))) #define VDI_DISK_SIZE_MAX ((uint64_t)VDI_BLOCKS_IN_IMAGE_MAX * \ (uint64_t)DEFAULT_CLUSTER_SIZE) diff --git a/tests/qemu-iotests/084 b/tests/qemu-iotests/084 index 2712c023a9..733018d4a8 100755 --- a/tests/qemu-iotests/084 +++ b/tests/qemu-iotests/084 @@ -66,15 +66,15 @@ stat -c"disk image file size in bytes: %s" "${TEST_IMG}" # check for image size too large # poke max image size, and appropriate blocks_in_image value -echo "Test 1: Maximum size (1024 TB):" -poke_file "$TEST_IMG" "$ds_offset" "\x00\x00\xf0\xff\xff\xff\x03\x00" -poke_file "$TEST_IMG" "$bii_offset" "\xff\xff\xff\x3f" +echo "Test 1: Maximum size (512 TB - 128 MB):" +poke_file "$TEST_IMG" "$ds_offset" "\x00\x00\x00\xf8\xff\xff\x01\x00" +poke_file "$TEST_IMG" "$bii_offset" "\x80\xff\xff\x1f" _img_info echo -echo "Test 2: Size too large (1024TB + 1)" +echo "Test 2: Size too large (512 TB - 128 MB + 64 kB)" # This should be too large (-EINVAL): -poke_file "$TEST_IMG" "$ds_offset" "\x00\x00\xf1\xff\xff\xff\x03\x00" +poke_file "$TEST_IMG" "$ds_offset" "\x00\x00\x01\xf8\xff\xff\x01\x00" _img_info echo @@ -89,9 +89,9 @@ _img_info echo echo "Test 4: Size valid (64M), but Blocks In Image exceeds max allowed" -# Now check the bounds of blocks_in_image - 0x3fffffff should be the max +# Now check the bounds of blocks_in_image - 0x1fffff80 should be the max # value here, and we should get -ENOTSUP -poke_file "$TEST_IMG" "$bii_offset" "\x00\x00\x00\x40" +poke_file "$TEST_IMG" "$bii_offset" "\x81\xff\xff\x1f" _img_info # Finally, 1MB is the only block size supported. Verify that diff --git a/tests/qemu-iotests/084.out b/tests/qemu-iotests/084.out index ea29ae0b9d..5ece8299c8 100644 --- a/tests/qemu-iotests/084.out +++ b/tests/qemu-iotests/084.out @@ -17,17 +17,20 @@ file format: IMGFMT virtual size: 64M (67108864 bytes) cluster_size: 1048576 disk image file size in bytes: 1024 -Test 1: Maximum size (1024 TB): -qemu-img: Could not open 'TEST_DIR/t.IMGFMT': Could not open 'TEST_DIR/t.IMGFMT': Invalid argument +Test 1: Maximum size (512 TB - 128 MB): +image: TEST_DIR/t.IMGFMT +file format: IMGFMT +virtual size: 512T (562949819203584 bytes) +cluster_size: 1048576 -Test 2: Size too large (1024TB + 1) -qemu-img: Could not open 'TEST_DIR/t.IMGFMT': Unsupported VDI image size (size is 0x3fffffff10000, max supported is 0x3fffffff00000) +Test 2: Size too large (512 TB - 128 MB + 64 kB) +qemu-img: Could not open 'TEST_DIR/t.IMGFMT': Unsupported VDI image size (size is 0x1fffff8010000, max supported is 0x1fffff8000000) Test 3: Size valid (64M), but Blocks In Image too small (63) qemu-img: Could not open 'TEST_DIR/t.IMGFMT': unsupported VDI image (disk size 67108864, image bitmap has room for 66060288) Test 4: Size valid (64M), but Blocks In Image exceeds max allowed -qemu-img: Could not open 'TEST_DIR/t.IMGFMT': unsupported VDI image (too many blocks 1073741824, max is 1073741823) +qemu-img: Could not open 'TEST_DIR/t.IMGFMT': unsupported VDI image (too many blocks 536870785, max is 536870784) Test 5: Valid Image: 64MB, Blocks In Image 64, Block Size 1MB image: TEST_DIR/t.IMGFMT |