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Merge remote-tracking branch 'mreitz/block' into queue-block

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* mreitz/block:
  block/vdi: Limit maximum size even futher
This commit is contained in:
Kevin Wolf 2014-11-10 10:41:34 +01:00
commit ea3beed41d
3 changed files with 27 additions and 14 deletions
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14
block/vdi.c
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@ -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)

14
tests/qemu-iotests/084
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@ -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

13
tests/qemu-iotests/084.out
View File

@ -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