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qcow2: Fix alignment checks in encrypted images

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I/O requests to encrypted media should be aligned to the sector size
used by the underlying encryption method, not to BDRV_SECTOR_SIZE.
Fortunately this doesn't break anything at the moment because
both existing QCRYPTO_BLOCK_*_SECTOR_SIZE have the same value as
BDRV_SECTOR_SIZE.

The checks in qcow2_co_preadv_encrypted() are also unnecessary because
they are repeated immediately afterwards in qcow2_co_encdec().

Signed-off-by: Alberto Garcia <berto@igalia.com>
Message-Id: <20200213171646.15876-1-berto@igalia.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Alberto Garcia 2020-02-13 18:16:46 +01:00 committed by Kevin Wolf
parent 7e6c4ff792
commit 2d4b5256cf
2 changed files with 8 additions and 6 deletions
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12
block/qcow2-threads.c
View File

@ -246,12 +246,15 @@ qcow2_co_encdec(BlockDriverState *bs, uint64_t host_offset,
.len = len,
.func = func,
};
uint64_t sector_size;
assert(QEMU_IS_ALIGNED(guest_offset, BDRV_SECTOR_SIZE));
assert(QEMU_IS_ALIGNED(host_offset, BDRV_SECTOR_SIZE));
assert(QEMU_IS_ALIGNED(len, BDRV_SECTOR_SIZE));
assert(s->crypto);
sector_size = qcrypto_block_get_sector_size(s->crypto);
assert(QEMU_IS_ALIGNED(guest_offset, sector_size));
assert(QEMU_IS_ALIGNED(host_offset, sector_size));
assert(QEMU_IS_ALIGNED(len, sector_size));
return len == 0 ? 0 : qcow2_co_process(bs, qcow2_encdec_pool_func, &arg);
}
@ -270,7 +273,8 @@ qcow2_co_encdec(BlockDriverState *bs, uint64_t host_offset,
* will be written to the underlying storage device at
* @host_offset
*
* @len - length of the buffer (must be a BDRV_SECTOR_SIZE multiple)
* @len - length of the buffer (must be a multiple of the encryption
* sector size)
*
* Depending on the encryption method, @host_offset and/or @guest_offset
* may be used for generating the initialization vector for

2
block/qcow2.c
View File

@ -2068,8 +2068,6 @@ qcow2_co_preadv_encrypted(BlockDriverState *bs,
goto fail;
}
assert(QEMU_IS_ALIGNED(offset, BDRV_SECTOR_SIZE));
assert(QEMU_IS_ALIGNED(bytes, BDRV_SECTOR_SIZE));
if (qcow2_co_decrypt(bs,
file_cluster_offset + offset_into_cluster(s, offset),
offset, buf, bytes) < 0)