Some block drivers have traditionally changed their node to read-only mode without asking the user. This behaviour has been marked deprecated since 2.11, expecting users to provide an explicit read-only=on option. Now that we have auto-read-only=on, enable these drivers to make use of the option. This is the only use of bdrv_set_read_only(), so we can make it a bit more specific and turn it into a bdrv_apply_auto_read_only() that is more convenient for drivers to use. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
715 lines
22 KiB
C
715 lines
22 KiB
C
/*
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* QEMU Block driver for DMG images
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*
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* Copyright (c) 2004 Johannes E. Schindelin
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qemu-common.h"
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#include "block/block_int.h"
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#include "qemu/bswap.h"
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#include "qemu/error-report.h"
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#include "qemu/module.h"
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#include "dmg.h"
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int (*dmg_uncompress_bz2)(char *next_in, unsigned int avail_in,
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char *next_out, unsigned int avail_out);
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enum {
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/* Limit chunk sizes to prevent unreasonable amounts of memory being used
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* or truncating when converting to 32-bit types
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*/
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DMG_LENGTHS_MAX = 64 * 1024 * 1024, /* 64 MB */
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DMG_SECTORCOUNTS_MAX = DMG_LENGTHS_MAX / 512,
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};
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static int dmg_probe(const uint8_t *buf, int buf_size, const char *filename)
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{
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int len;
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if (!filename) {
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return 0;
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}
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len = strlen(filename);
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if (len > 4 && !strcmp(filename + len - 4, ".dmg")) {
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return 2;
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}
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return 0;
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}
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static int read_uint64(BlockDriverState *bs, int64_t offset, uint64_t *result)
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{
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uint64_t buffer;
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int ret;
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ret = bdrv_pread(bs->file, offset, &buffer, 8);
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if (ret < 0) {
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return ret;
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}
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*result = be64_to_cpu(buffer);
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return 0;
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}
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static int read_uint32(BlockDriverState *bs, int64_t offset, uint32_t *result)
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{
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uint32_t buffer;
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int ret;
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ret = bdrv_pread(bs->file, offset, &buffer, 4);
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if (ret < 0) {
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return ret;
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}
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*result = be32_to_cpu(buffer);
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return 0;
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}
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static inline uint64_t buff_read_uint64(const uint8_t *buffer, int64_t offset)
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{
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return be64_to_cpu(*(uint64_t *)&buffer[offset]);
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}
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static inline uint32_t buff_read_uint32(const uint8_t *buffer, int64_t offset)
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{
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return be32_to_cpu(*(uint32_t *)&buffer[offset]);
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}
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/* Increase max chunk sizes, if necessary. This function is used to calculate
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* the buffer sizes needed for compressed/uncompressed chunk I/O.
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*/
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static void update_max_chunk_size(BDRVDMGState *s, uint32_t chunk,
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uint32_t *max_compressed_size,
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uint32_t *max_sectors_per_chunk)
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{
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uint32_t compressed_size = 0;
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uint32_t uncompressed_sectors = 0;
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switch (s->types[chunk]) {
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case 0x80000005: /* zlib compressed */
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case 0x80000006: /* bzip2 compressed */
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compressed_size = s->lengths[chunk];
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uncompressed_sectors = s->sectorcounts[chunk];
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break;
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case 1: /* copy */
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uncompressed_sectors = DIV_ROUND_UP(s->lengths[chunk], 512);
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break;
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case 2: /* zero */
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/* as the all-zeroes block may be large, it is treated specially: the
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* sector is not copied from a large buffer, a simple memset is used
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* instead. Therefore uncompressed_sectors does not need to be set. */
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break;
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}
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if (compressed_size > *max_compressed_size) {
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*max_compressed_size = compressed_size;
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}
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if (uncompressed_sectors > *max_sectors_per_chunk) {
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*max_sectors_per_chunk = uncompressed_sectors;
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}
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}
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static int64_t dmg_find_koly_offset(BdrvChild *file, Error **errp)
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{
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BlockDriverState *file_bs = file->bs;
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int64_t length;
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int64_t offset = 0;
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uint8_t buffer[515];
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int i, ret;
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/* bdrv_getlength returns a multiple of block size (512), rounded up. Since
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* dmg images can have odd sizes, try to look for the "koly" magic which
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* marks the begin of the UDIF trailer (512 bytes). This magic can be found
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* in the last 511 bytes of the second-last sector or the first 4 bytes of
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* the last sector (search space: 515 bytes) */
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length = bdrv_getlength(file_bs);
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if (length < 0) {
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error_setg_errno(errp, -length,
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"Failed to get file size while reading UDIF trailer");
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return length;
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} else if (length < 512) {
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error_setg(errp, "dmg file must be at least 512 bytes long");
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return -EINVAL;
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}
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if (length > 511 + 512) {
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offset = length - 511 - 512;
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}
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length = length < 515 ? length : 515;
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ret = bdrv_pread(file, offset, buffer, length);
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if (ret < 0) {
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error_setg_errno(errp, -ret, "Failed while reading UDIF trailer");
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return ret;
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}
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for (i = 0; i < length - 3; i++) {
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if (buffer[i] == 'k' && buffer[i+1] == 'o' &&
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buffer[i+2] == 'l' && buffer[i+3] == 'y') {
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return offset + i;
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}
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}
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error_setg(errp, "Could not locate UDIF trailer in dmg file");
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return -EINVAL;
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}
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/* used when building the sector table */
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typedef struct DmgHeaderState {
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/* used internally by dmg_read_mish_block to remember offsets of blocks
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* across calls */
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uint64_t data_fork_offset;
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/* exported for dmg_open */
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uint32_t max_compressed_size;
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uint32_t max_sectors_per_chunk;
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} DmgHeaderState;
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static bool dmg_is_known_block_type(uint32_t entry_type)
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{
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switch (entry_type) {
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case 0x00000001: /* uncompressed */
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case 0x00000002: /* zeroes */
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case 0x80000005: /* zlib */
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return true;
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case 0x80000006: /* bzip2 */
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return !!dmg_uncompress_bz2;
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default:
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return false;
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}
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}
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static int dmg_read_mish_block(BDRVDMGState *s, DmgHeaderState *ds,
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uint8_t *buffer, uint32_t count)
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{
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uint32_t type, i;
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int ret;
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size_t new_size;
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uint32_t chunk_count;
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int64_t offset = 0;
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uint64_t data_offset;
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uint64_t in_offset = ds->data_fork_offset;
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uint64_t out_offset;
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type = buff_read_uint32(buffer, offset);
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/* skip data that is not a valid MISH block (invalid magic or too small) */
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if (type != 0x6d697368 || count < 244) {
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/* assume success for now */
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return 0;
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}
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/* chunk offsets are relative to this sector number */
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out_offset = buff_read_uint64(buffer, offset + 8);
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/* location in data fork for (compressed) blob (in bytes) */
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data_offset = buff_read_uint64(buffer, offset + 0x18);
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in_offset += data_offset;
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/* move to begin of chunk entries */
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offset += 204;
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chunk_count = (count - 204) / 40;
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new_size = sizeof(uint64_t) * (s->n_chunks + chunk_count);
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s->types = g_realloc(s->types, new_size / 2);
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s->offsets = g_realloc(s->offsets, new_size);
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s->lengths = g_realloc(s->lengths, new_size);
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s->sectors = g_realloc(s->sectors, new_size);
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s->sectorcounts = g_realloc(s->sectorcounts, new_size);
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for (i = s->n_chunks; i < s->n_chunks + chunk_count; i++) {
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s->types[i] = buff_read_uint32(buffer, offset);
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if (!dmg_is_known_block_type(s->types[i])) {
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chunk_count--;
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i--;
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offset += 40;
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continue;
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}
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/* sector number */
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s->sectors[i] = buff_read_uint64(buffer, offset + 8);
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s->sectors[i] += out_offset;
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/* sector count */
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s->sectorcounts[i] = buff_read_uint64(buffer, offset + 0x10);
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/* all-zeroes sector (type 2) does not need to be "uncompressed" and can
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* therefore be unbounded. */
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if (s->types[i] != 2 && s->sectorcounts[i] > DMG_SECTORCOUNTS_MAX) {
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error_report("sector count %" PRIu64 " for chunk %" PRIu32
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" is larger than max (%u)",
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s->sectorcounts[i], i, DMG_SECTORCOUNTS_MAX);
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ret = -EINVAL;
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goto fail;
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}
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/* offset in (compressed) data fork */
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s->offsets[i] = buff_read_uint64(buffer, offset + 0x18);
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s->offsets[i] += in_offset;
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/* length in (compressed) data fork */
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s->lengths[i] = buff_read_uint64(buffer, offset + 0x20);
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if (s->lengths[i] > DMG_LENGTHS_MAX) {
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error_report("length %" PRIu64 " for chunk %" PRIu32
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" is larger than max (%u)",
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s->lengths[i], i, DMG_LENGTHS_MAX);
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ret = -EINVAL;
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goto fail;
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}
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update_max_chunk_size(s, i, &ds->max_compressed_size,
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&ds->max_sectors_per_chunk);
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offset += 40;
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}
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s->n_chunks += chunk_count;
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return 0;
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fail:
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return ret;
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}
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static int dmg_read_resource_fork(BlockDriverState *bs, DmgHeaderState *ds,
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uint64_t info_begin, uint64_t info_length)
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{
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BDRVDMGState *s = bs->opaque;
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int ret;
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uint32_t count, rsrc_data_offset;
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uint8_t *buffer = NULL;
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uint64_t info_end;
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uint64_t offset;
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/* read offset from begin of resource fork (info_begin) to resource data */
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ret = read_uint32(bs, info_begin, &rsrc_data_offset);
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if (ret < 0) {
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goto fail;
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} else if (rsrc_data_offset > info_length) {
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ret = -EINVAL;
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goto fail;
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}
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/* read length of resource data */
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ret = read_uint32(bs, info_begin + 8, &count);
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if (ret < 0) {
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goto fail;
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} else if (count == 0 || rsrc_data_offset + count > info_length) {
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ret = -EINVAL;
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goto fail;
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}
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/* begin of resource data (consisting of one or more resources) */
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offset = info_begin + rsrc_data_offset;
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/* end of resource data (there is possibly a following resource map
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* which will be ignored). */
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info_end = offset + count;
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/* read offsets (mish blocks) from one or more resources in resource data */
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while (offset < info_end) {
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/* size of following resource */
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ret = read_uint32(bs, offset, &count);
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if (ret < 0) {
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goto fail;
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} else if (count == 0 || count > info_end - offset) {
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ret = -EINVAL;
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goto fail;
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}
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offset += 4;
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buffer = g_realloc(buffer, count);
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ret = bdrv_pread(bs->file, offset, buffer, count);
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if (ret < 0) {
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goto fail;
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}
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ret = dmg_read_mish_block(s, ds, buffer, count);
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if (ret < 0) {
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goto fail;
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}
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/* advance offset by size of resource */
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offset += count;
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}
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ret = 0;
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fail:
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g_free(buffer);
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return ret;
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}
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static int dmg_read_plist_xml(BlockDriverState *bs, DmgHeaderState *ds,
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uint64_t info_begin, uint64_t info_length)
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{
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BDRVDMGState *s = bs->opaque;
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int ret;
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uint8_t *buffer = NULL;
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char *data_begin, *data_end;
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/* Have at least some length to avoid NULL for g_malloc. Attempt to set a
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* safe upper cap on the data length. A test sample had a XML length of
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* about 1 MiB. */
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if (info_length == 0 || info_length > 16 * 1024 * 1024) {
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ret = -EINVAL;
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goto fail;
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}
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buffer = g_malloc(info_length + 1);
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buffer[info_length] = '\0';
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ret = bdrv_pread(bs->file, info_begin, buffer, info_length);
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if (ret != info_length) {
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ret = -EINVAL;
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goto fail;
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}
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/* look for <data>...</data>. The data is 284 (0x11c) bytes after base64
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* decode. The actual data element has 431 (0x1af) bytes which includes tabs
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* and line feeds. */
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data_end = (char *)buffer;
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while ((data_begin = strstr(data_end, "<data>")) != NULL) {
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guchar *mish;
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gsize out_len = 0;
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data_begin += 6;
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data_end = strstr(data_begin, "</data>");
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/* malformed XML? */
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if (data_end == NULL) {
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ret = -EINVAL;
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goto fail;
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}
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*data_end++ = '\0';
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mish = g_base64_decode(data_begin, &out_len);
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ret = dmg_read_mish_block(s, ds, mish, (uint32_t)out_len);
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g_free(mish);
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if (ret < 0) {
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goto fail;
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}
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}
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ret = 0;
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fail:
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g_free(buffer);
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return ret;
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}
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static int dmg_open(BlockDriverState *bs, QDict *options, int flags,
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Error **errp)
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{
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BDRVDMGState *s = bs->opaque;
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DmgHeaderState ds;
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uint64_t rsrc_fork_offset, rsrc_fork_length;
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uint64_t plist_xml_offset, plist_xml_length;
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int64_t offset;
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int ret;
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ret = bdrv_apply_auto_read_only(bs, NULL, errp);
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if (ret < 0) {
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return ret;
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}
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bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
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false, errp);
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if (!bs->file) {
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return -EINVAL;
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}
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block_module_load_one("dmg-bz2");
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s->n_chunks = 0;
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s->offsets = s->lengths = s->sectors = s->sectorcounts = NULL;
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/* used by dmg_read_mish_block to keep track of the current I/O position */
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ds.data_fork_offset = 0;
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ds.max_compressed_size = 1;
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ds.max_sectors_per_chunk = 1;
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/* locate the UDIF trailer */
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offset = dmg_find_koly_offset(bs->file, errp);
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if (offset < 0) {
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ret = offset;
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goto fail;
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}
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/* offset of data fork (DataForkOffset) */
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ret = read_uint64(bs, offset + 0x18, &ds.data_fork_offset);
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if (ret < 0) {
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goto fail;
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} else if (ds.data_fork_offset > offset) {
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ret = -EINVAL;
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goto fail;
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}
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/* offset of resource fork (RsrcForkOffset) */
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ret = read_uint64(bs, offset + 0x28, &rsrc_fork_offset);
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if (ret < 0) {
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goto fail;
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}
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ret = read_uint64(bs, offset + 0x30, &rsrc_fork_length);
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if (ret < 0) {
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goto fail;
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|
}
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if (rsrc_fork_offset >= offset ||
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rsrc_fork_length > offset - rsrc_fork_offset) {
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ret = -EINVAL;
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goto fail;
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}
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/* offset of property list (XMLOffset) */
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ret = read_uint64(bs, offset + 0xd8, &plist_xml_offset);
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if (ret < 0) {
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goto fail;
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}
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ret = read_uint64(bs, offset + 0xe0, &plist_xml_length);
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if (ret < 0) {
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goto fail;
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}
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if (plist_xml_offset >= offset ||
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plist_xml_length > offset - plist_xml_offset) {
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ret = -EINVAL;
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goto fail;
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}
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ret = read_uint64(bs, offset + 0x1ec, (uint64_t *)&bs->total_sectors);
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if (ret < 0) {
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goto fail;
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}
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if (bs->total_sectors < 0) {
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ret = -EINVAL;
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goto fail;
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}
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if (rsrc_fork_length != 0) {
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ret = dmg_read_resource_fork(bs, &ds,
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rsrc_fork_offset, rsrc_fork_length);
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if (ret < 0) {
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goto fail;
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}
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} else if (plist_xml_length != 0) {
|
|
ret = dmg_read_plist_xml(bs, &ds, plist_xml_offset, plist_xml_length);
|
|
if (ret < 0) {
|
|
goto fail;
|
|
}
|
|
} else {
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
/* initialize zlib engine */
|
|
s->compressed_chunk = qemu_try_blockalign(bs->file->bs,
|
|
ds.max_compressed_size + 1);
|
|
s->uncompressed_chunk = qemu_try_blockalign(bs->file->bs,
|
|
512 * ds.max_sectors_per_chunk);
|
|
if (s->compressed_chunk == NULL || s->uncompressed_chunk == NULL) {
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
if (inflateInit(&s->zstream) != Z_OK) {
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
s->current_chunk = s->n_chunks;
|
|
|
|
qemu_co_mutex_init(&s->lock);
|
|
return 0;
|
|
|
|
fail:
|
|
g_free(s->types);
|
|
g_free(s->offsets);
|
|
g_free(s->lengths);
|
|
g_free(s->sectors);
|
|
g_free(s->sectorcounts);
|
|
qemu_vfree(s->compressed_chunk);
|
|
qemu_vfree(s->uncompressed_chunk);
|
|
return ret;
|
|
}
|
|
|
|
static void dmg_refresh_limits(BlockDriverState *bs, Error **errp)
|
|
{
|
|
bs->bl.request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O */
|
|
}
|
|
|
|
static inline int is_sector_in_chunk(BDRVDMGState* s,
|
|
uint32_t chunk_num, uint64_t sector_num)
|
|
{
|
|
if (chunk_num >= s->n_chunks || s->sectors[chunk_num] > sector_num ||
|
|
s->sectors[chunk_num] + s->sectorcounts[chunk_num] <= sector_num) {
|
|
return 0;
|
|
} else {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
static inline uint32_t search_chunk(BDRVDMGState *s, uint64_t sector_num)
|
|
{
|
|
/* binary search */
|
|
uint32_t chunk1 = 0, chunk2 = s->n_chunks, chunk3;
|
|
while (chunk1 != chunk2) {
|
|
chunk3 = (chunk1 + chunk2) / 2;
|
|
if (s->sectors[chunk3] > sector_num) {
|
|
chunk2 = chunk3;
|
|
} else if (s->sectors[chunk3] + s->sectorcounts[chunk3] > sector_num) {
|
|
return chunk3;
|
|
} else {
|
|
chunk1 = chunk3;
|
|
}
|
|
}
|
|
return s->n_chunks; /* error */
|
|
}
|
|
|
|
static inline int dmg_read_chunk(BlockDriverState *bs, uint64_t sector_num)
|
|
{
|
|
BDRVDMGState *s = bs->opaque;
|
|
|
|
if (!is_sector_in_chunk(s, s->current_chunk, sector_num)) {
|
|
int ret;
|
|
uint32_t chunk = search_chunk(s, sector_num);
|
|
|
|
if (chunk >= s->n_chunks) {
|
|
return -1;
|
|
}
|
|
|
|
s->current_chunk = s->n_chunks;
|
|
switch (s->types[chunk]) { /* block entry type */
|
|
case 0x80000005: { /* zlib compressed */
|
|
/* we need to buffer, because only the chunk as whole can be
|
|
* inflated. */
|
|
ret = bdrv_pread(bs->file, s->offsets[chunk],
|
|
s->compressed_chunk, s->lengths[chunk]);
|
|
if (ret != s->lengths[chunk]) {
|
|
return -1;
|
|
}
|
|
|
|
s->zstream.next_in = s->compressed_chunk;
|
|
s->zstream.avail_in = s->lengths[chunk];
|
|
s->zstream.next_out = s->uncompressed_chunk;
|
|
s->zstream.avail_out = 512 * s->sectorcounts[chunk];
|
|
ret = inflateReset(&s->zstream);
|
|
if (ret != Z_OK) {
|
|
return -1;
|
|
}
|
|
ret = inflate(&s->zstream, Z_FINISH);
|
|
if (ret != Z_STREAM_END ||
|
|
s->zstream.total_out != 512 * s->sectorcounts[chunk]) {
|
|
return -1;
|
|
}
|
|
break; }
|
|
case 0x80000006: /* bzip2 compressed */
|
|
if (!dmg_uncompress_bz2) {
|
|
break;
|
|
}
|
|
/* we need to buffer, because only the chunk as whole can be
|
|
* inflated. */
|
|
ret = bdrv_pread(bs->file, s->offsets[chunk],
|
|
s->compressed_chunk, s->lengths[chunk]);
|
|
if (ret != s->lengths[chunk]) {
|
|
return -1;
|
|
}
|
|
|
|
ret = dmg_uncompress_bz2((char *)s->compressed_chunk,
|
|
(unsigned int) s->lengths[chunk],
|
|
(char *)s->uncompressed_chunk,
|
|
(unsigned int)
|
|
(512 * s->sectorcounts[chunk]));
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
break;
|
|
case 1: /* copy */
|
|
ret = bdrv_pread(bs->file, s->offsets[chunk],
|
|
s->uncompressed_chunk, s->lengths[chunk]);
|
|
if (ret != s->lengths[chunk]) {
|
|
return -1;
|
|
}
|
|
break;
|
|
case 2: /* zero */
|
|
/* see dmg_read, it is treated specially. No buffer needs to be
|
|
* pre-filled, the zeroes can be set directly. */
|
|
break;
|
|
}
|
|
s->current_chunk = chunk;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int coroutine_fn
|
|
dmg_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
|
|
QEMUIOVector *qiov, int flags)
|
|
{
|
|
BDRVDMGState *s = bs->opaque;
|
|
uint64_t sector_num = offset >> BDRV_SECTOR_BITS;
|
|
int nb_sectors = bytes >> BDRV_SECTOR_BITS;
|
|
int ret, i;
|
|
|
|
assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0);
|
|
assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0);
|
|
|
|
qemu_co_mutex_lock(&s->lock);
|
|
|
|
for (i = 0; i < nb_sectors; i++) {
|
|
uint32_t sector_offset_in_chunk;
|
|
void *data;
|
|
|
|
if (dmg_read_chunk(bs, sector_num + i) != 0) {
|
|
ret = -EIO;
|
|
goto fail;
|
|
}
|
|
/* Special case: current chunk is all zeroes. Do not perform a memcpy as
|
|
* s->uncompressed_chunk may be too small to cover the large all-zeroes
|
|
* section. dmg_read_chunk is called to find s->current_chunk */
|
|
if (s->types[s->current_chunk] == 2) { /* all zeroes block entry */
|
|
qemu_iovec_memset(qiov, i * 512, 0, 512);
|
|
continue;
|
|
}
|
|
sector_offset_in_chunk = sector_num + i - s->sectors[s->current_chunk];
|
|
data = s->uncompressed_chunk + sector_offset_in_chunk * 512;
|
|
qemu_iovec_from_buf(qiov, i * 512, data, 512);
|
|
}
|
|
|
|
ret = 0;
|
|
fail:
|
|
qemu_co_mutex_unlock(&s->lock);
|
|
return ret;
|
|
}
|
|
|
|
static void dmg_close(BlockDriverState *bs)
|
|
{
|
|
BDRVDMGState *s = bs->opaque;
|
|
|
|
g_free(s->types);
|
|
g_free(s->offsets);
|
|
g_free(s->lengths);
|
|
g_free(s->sectors);
|
|
g_free(s->sectorcounts);
|
|
qemu_vfree(s->compressed_chunk);
|
|
qemu_vfree(s->uncompressed_chunk);
|
|
|
|
inflateEnd(&s->zstream);
|
|
}
|
|
|
|
static BlockDriver bdrv_dmg = {
|
|
.format_name = "dmg",
|
|
.instance_size = sizeof(BDRVDMGState),
|
|
.bdrv_probe = dmg_probe,
|
|
.bdrv_open = dmg_open,
|
|
.bdrv_refresh_limits = dmg_refresh_limits,
|
|
.bdrv_child_perm = bdrv_format_default_perms,
|
|
.bdrv_co_preadv = dmg_co_preadv,
|
|
.bdrv_close = dmg_close,
|
|
};
|
|
|
|
static void bdrv_dmg_init(void)
|
|
{
|
|
bdrv_register(&bdrv_dmg);
|
|
}
|
|
|
|
block_init(bdrv_dmg_init);
|