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xemu/hw/ide/atapi.c
Prasad J Pandit b8d7f1bc59 ide: atapi: check logical block address and read size (CVE-2020-29443) 
While processing ATAPI cmd_read/cmd_read_cd commands,
Logical Block Address (LBA) maybe invalid OR closer to the last block,
leading to an OOB access issues. Add range check to avoid it.

Fixes: CVE-2020-29443
Reported-by: Wenxiang Qian <leonwxqian@gmail.com>
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Message-Id: <20210118115130.457044-1-ppandit@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2021-01-23 09:26:40 -05:00

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/*
* QEMU ATAPI Emulation
*
* Copyright (c) 2003 Fabrice Bellard
* Copyright (c) 2006 Openedhand Ltd.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "hw/ide/internal.h"
#include "hw/scsi/scsi.h"
#include "sysemu/block-backend.h"
#include "trace.h"
#define ATAPI_SECTOR_BITS (2 + BDRV_SECTOR_BITS)
#define ATAPI_SECTOR_SIZE (1 << ATAPI_SECTOR_BITS)
static void ide_atapi_cmd_read_dma_cb(void *opaque, int ret);
static void padstr8(uint8_t *buf, int buf_size, const char *src)
{
int i;
for(i = 0; i < buf_size; i++) {
if (*src)
buf[i] = *src++;
else
buf[i] = ' ';
}
}
static void lba_to_msf(uint8_t *buf, int lba)
{
lba += 150;
buf[0] = (lba / 75) / 60;
buf[1] = (lba / 75) % 60;
buf[2] = lba % 75;
}
static inline int media_present(IDEState *s)
{
return !s->tray_open && s->nb_sectors > 0;
}
/* XXX: DVDs that could fit on a CD will be reported as a CD */
static inline int media_is_dvd(IDEState *s)
{
return (media_present(s) && s->nb_sectors > CD_MAX_SECTORS);
}
static inline int media_is_cd(IDEState *s)
{
return (media_present(s) && s->nb_sectors <= CD_MAX_SECTORS);
}
static void cd_data_to_raw(uint8_t *buf, int lba)
{
/* sync bytes */
buf[0] = 0x00;
memset(buf + 1, 0xff, 10);
buf[11] = 0x00;
buf += 12;
/* MSF */
lba_to_msf(buf, lba);
buf[3] = 0x01; /* mode 1 data */
buf += 4;
/* data */
buf += 2048;
/* XXX: ECC not computed */
memset(buf, 0, 288);
}
static int
cd_read_sector_sync(IDEState *s)
{
int ret;
block_acct_start(blk_get_stats(s->blk), &s->acct,
ATAPI_SECTOR_SIZE, BLOCK_ACCT_READ);
trace_cd_read_sector_sync(s->lba);
switch (s->cd_sector_size) {
case 2048:
ret = blk_pread(s->blk, (int64_t)s->lba << ATAPI_SECTOR_BITS,
s->io_buffer, ATAPI_SECTOR_SIZE);
break;
case 2352:
ret = blk_pread(s->blk, (int64_t)s->lba << ATAPI_SECTOR_BITS,
s->io_buffer + 16, ATAPI_SECTOR_SIZE);
if (ret >= 0) {
cd_data_to_raw(s->io_buffer, s->lba);
}
break;
default:
block_acct_invalid(blk_get_stats(s->blk), BLOCK_ACCT_READ);
return -EIO;
}
if (ret < 0) {
block_acct_failed(blk_get_stats(s->blk), &s->acct);
} else {
block_acct_done(blk_get_stats(s->blk), &s->acct);
s->lba++;
s->io_buffer_index = 0;
}
return ret;
}
static void cd_read_sector_cb(void *opaque, int ret)
{
IDEState *s = opaque;
trace_cd_read_sector_cb(s->lba, ret);
if (ret < 0) {
block_acct_failed(blk_get_stats(s->blk), &s->acct);
ide_atapi_io_error(s, ret);
return;
}
block_acct_done(blk_get_stats(s->blk), &s->acct);
if (s->cd_sector_size == 2352) {
cd_data_to_raw(s->io_buffer, s->lba);
}
s->lba++;
s->io_buffer_index = 0;
s->status &= ~BUSY_STAT;
ide_atapi_cmd_reply_end(s);
}
static int cd_read_sector(IDEState *s)
{
void *buf;
if (s->cd_sector_size != 2048 && s->cd_sector_size != 2352) {
block_acct_invalid(blk_get_stats(s->blk), BLOCK_ACCT_READ);
return -EINVAL;
}
buf = (s->cd_sector_size == 2352) ? s->io_buffer + 16 : s->io_buffer;
qemu_iovec_init_buf(&s->qiov, buf, ATAPI_SECTOR_SIZE);
trace_cd_read_sector(s->lba);
block_acct_start(blk_get_stats(s->blk), &s->acct,
ATAPI_SECTOR_SIZE, BLOCK_ACCT_READ);
ide_buffered_readv(s, (int64_t)s->lba << 2, &s->qiov, 4,
cd_read_sector_cb, s);
s->status |= BUSY_STAT;
return 0;
}
void ide_atapi_cmd_ok(IDEState *s)
{
s->error = 0;
s->status = READY_STAT | SEEK_STAT;
s->nsector = (s->nsector & ~7) | ATAPI_INT_REASON_IO | ATAPI_INT_REASON_CD;
ide_transfer_stop(s);
ide_set_irq(s->bus);
}
void ide_atapi_cmd_error(IDEState *s, int sense_key, int asc)
{
trace_ide_atapi_cmd_error(s, sense_key, asc);
s->error = sense_key << 4;
s->status = READY_STAT | ERR_STAT;
s->nsector = (s->nsector & ~7) | ATAPI_INT_REASON_IO | ATAPI_INT_REASON_CD;
s->sense_key = sense_key;
s->asc = asc;
ide_transfer_stop(s);
ide_set_irq(s->bus);
}
void ide_atapi_io_error(IDEState *s, int ret)
{
/* XXX: handle more errors */
if (ret == -ENOMEDIUM) {
ide_atapi_cmd_error(s, NOT_READY,
ASC_MEDIUM_NOT_PRESENT);
} else {
ide_atapi_cmd_error(s, ILLEGAL_REQUEST,
ASC_LOGICAL_BLOCK_OOR);
}
}
static uint16_t atapi_byte_count_limit(IDEState *s)
{
uint16_t bcl;
bcl = s->lcyl | (s->hcyl << 8);
if (bcl == 0xffff) {
return 0xfffe;
}
return bcl;
}
/* The whole ATAPI transfer logic is handled in this function */
void ide_atapi_cmd_reply_end(IDEState *s)
{
int byte_count_limit, size, ret;
while (s->packet_transfer_size > 0) {
trace_ide_atapi_cmd_reply_end(s, s->packet_transfer_size,
s->elementary_transfer_size,
s->io_buffer_index);
/* see if a new sector must be read */
if (s->lba != -1 && s->io_buffer_index >= s->cd_sector_size) {
if (!s->elementary_transfer_size) {
ret = cd_read_sector(s);
if (ret < 0) {
ide_atapi_io_error(s, ret);
}
return;
} else {
/* rebuffering within an elementary transfer is
* only possible with a sync request because we
* end up with a race condition otherwise */
ret = cd_read_sector_sync(s);
if (ret < 0) {
ide_atapi_io_error(s, ret);
return;
}
}
}
if (s->elementary_transfer_size > 0) {
/* there are some data left to transmit in this elementary
transfer */
size = s->cd_sector_size - s->io_buffer_index;
if (size > s->elementary_transfer_size)
size = s->elementary_transfer_size;
} else {
/* a new transfer is needed */
s->nsector = (s->nsector & ~7) | ATAPI_INT_REASON_IO;
ide_set_irq(s->bus);
byte_count_limit = atapi_byte_count_limit(s);
trace_ide_atapi_cmd_reply_end_bcl(s, byte_count_limit);
size = s->packet_transfer_size;
if (size > byte_count_limit) {
/* byte count limit must be even if this case */
if (byte_count_limit & 1)
byte_count_limit--;
size = byte_count_limit;
}
s->lcyl = size;
s->hcyl = size >> 8;
s->elementary_transfer_size = size;
/* we cannot transmit more than one sector at a time */
if (s->lba != -1) {
if (size > (s->cd_sector_size - s->io_buffer_index))
size = (s->cd_sector_size - s->io_buffer_index);
}
trace_ide_atapi_cmd_reply_end_new(s, s->status);
}
s->packet_transfer_size -= size;
s->elementary_transfer_size -= size;
s->io_buffer_index += size;
assert(size <= s->io_buffer_total_len);
assert(s->io_buffer_index <= s->io_buffer_total_len);
/* Some adapters process PIO data right away. In that case, we need
* to avoid mutual recursion between ide_transfer_start
* and ide_atapi_cmd_reply_end.
*/
if (!ide_transfer_start_norecurse(s,
s->io_buffer + s->io_buffer_index - size,
size, ide_atapi_cmd_reply_end)) {
return;
}
}
/* end of transfer */
trace_ide_atapi_cmd_reply_end_eot(s, s->status);
ide_atapi_cmd_ok(s);
ide_set_irq(s->bus);
}
/* send a reply of 'size' bytes in s->io_buffer to an ATAPI command */
static void ide_atapi_cmd_reply(IDEState *s, int size, int max_size)
{
if (size > max_size)
size = max_size;
s->lba = -1; /* no sector read */
s->packet_transfer_size = size;
s->io_buffer_size = size; /* dma: send the reply data as one chunk */
s->elementary_transfer_size = 0;
if (s->atapi_dma) {
block_acct_start(blk_get_stats(s->blk), &s->acct, size,
BLOCK_ACCT_READ);
s->status = READY_STAT | SEEK_STAT | DRQ_STAT;
ide_start_dma(s, ide_atapi_cmd_read_dma_cb);
} else {
s->status = READY_STAT | SEEK_STAT;
s->io_buffer_index = 0;
ide_atapi_cmd_reply_end(s);
}
}
/* start a CD-CDROM read command */
static void ide_atapi_cmd_read_pio(IDEState *s, int lba, int nb_sectors,
int sector_size)
{
assert(0 <= lba && lba < (s->nb_sectors >> 2));
s->lba = lba;
s->packet_transfer_size = nb_sectors * sector_size;
s->elementary_transfer_size = 0;
s->io_buffer_index = sector_size;
s->cd_sector_size = sector_size;
ide_atapi_cmd_reply_end(s);
}
static void ide_atapi_cmd_check_status(IDEState *s)
{
trace_ide_atapi_cmd_check_status(s);
s->error = MC_ERR | (UNIT_ATTENTION << 4);
s->status = ERR_STAT;
s->nsector = 0;
ide_set_irq(s->bus);
}
/* ATAPI DMA support */
static void ide_atapi_cmd_read_dma_cb(void *opaque, int ret)
{
IDEState *s = opaque;
int data_offset, n;
if (ret < 0) {
if (ide_handle_rw_error(s, -ret, ide_dma_cmd_to_retry(s->dma_cmd))) {
if (s->bus->error_status) {
s->bus->dma->aiocb = NULL;
return;
}
goto eot;
}
}
if (s->io_buffer_size > 0) {
/*
* For a cdrom read sector command (s->lba != -1),
* adjust the lba for the next s->io_buffer_size chunk
* and dma the current chunk.
* For a command != read (s->lba == -1), just transfer
* the reply data.
*/
if (s->lba != -1) {
if (s->cd_sector_size == 2352) {
n = 1;
cd_data_to_raw(s->io_buffer, s->lba);
} else {
n = s->io_buffer_size >> 11;
}
s->lba += n;
}
s->packet_transfer_size -= s->io_buffer_size;
if (s->bus->dma->ops->rw_buf(s->bus->dma, 1) == 0)
goto eot;
}
if (s->packet_transfer_size <= 0) {
s->status = READY_STAT | SEEK_STAT;
s->nsector = (s->nsector & ~7) | ATAPI_INT_REASON_IO | ATAPI_INT_REASON_CD;
ide_set_irq(s->bus);
goto eot;
}
s->io_buffer_index = 0;
if (s->cd_sector_size == 2352) {
n = 1;
s->io_buffer_size = s->cd_sector_size;
data_offset = 16;
} else {
n = s->packet_transfer_size >> 11;
if (n > (IDE_DMA_BUF_SECTORS / 4))
n = (IDE_DMA_BUF_SECTORS / 4);
s->io_buffer_size = n * 2048;
data_offset = 0;
}
trace_ide_atapi_cmd_read_dma_cb_aio(s, s->lba, n);
qemu_iovec_init_buf(&s->bus->dma->qiov, s->io_buffer + data_offset,
n * ATAPI_SECTOR_SIZE);
s->bus->dma->aiocb = ide_buffered_readv(s, (int64_t)s->lba << 2,
&s->bus->dma->qiov, n * 4,
ide_atapi_cmd_read_dma_cb, s);
return;
eot:
if (ret < 0) {
block_acct_failed(blk_get_stats(s->blk), &s->acct);
} else {
block_acct_done(blk_get_stats(s->blk), &s->acct);
}
ide_set_inactive(s, false);
}
/* start a CD-CDROM read command with DMA */
/* XXX: test if DMA is available */
static void ide_atapi_cmd_read_dma(IDEState *s, int lba, int nb_sectors,
int sector_size)
{
assert(0 <= lba && lba < (s->nb_sectors >> 2));
s->lba = lba;
s->packet_transfer_size = nb_sectors * sector_size;
s->io_buffer_size = 0;
s->cd_sector_size = sector_size;
block_acct_start(blk_get_stats(s->blk), &s->acct, s->packet_transfer_size,
BLOCK_ACCT_READ);
/* XXX: check if BUSY_STAT should be set */
s->status = READY_STAT | SEEK_STAT | DRQ_STAT | BUSY_STAT;
ide_start_dma(s, ide_atapi_cmd_read_dma_cb);
}
static void ide_atapi_cmd_read(IDEState *s, int lba, int nb_sectors,
int sector_size)
{
trace_ide_atapi_cmd_read(s, s->atapi_dma ? "dma" : "pio",
lba, nb_sectors);
if (s->atapi_dma) {
ide_atapi_cmd_read_dma(s, lba, nb_sectors, sector_size);
} else {
ide_atapi_cmd_read_pio(s, lba, nb_sectors, sector_size);
}
}
void ide_atapi_dma_restart(IDEState *s)
{
/*
* At this point we can just re-evaluate the packet command and start over.
* The presence of ->dma_cb callback in the pre_save ensures that the packet
* command has been completely sent and we can safely restart command.
*/
s->unit = s->bus->retry_unit;
s->bus->dma->ops->restart_dma(s->bus->dma);
ide_atapi_cmd(s);
}
static inline uint8_t ide_atapi_set_profile(uint8_t *buf, uint8_t *index,
uint16_t profile)
{
uint8_t *buf_profile = buf + 12; /* start of profiles */
buf_profile += ((*index) * 4); /* start of indexed profile */
stw_be_p(buf_profile, profile);
buf_profile[2] = ((buf_profile[0] == buf[6]) && (buf_profile[1] == buf[7]));
/* each profile adds 4 bytes to the response */
(*index)++;
buf[11] += 4; /* Additional Length */
return 4;
}
static int ide_dvd_read_structure(IDEState *s, int format,
const uint8_t *packet, uint8_t *buf)
{
switch (format) {
case 0x0: /* Physical format information */
{
int layer = packet[6];
uint64_t total_sectors;
if (layer != 0)
return -ASC_INV_FIELD_IN_CMD_PACKET;
total_sectors = s->nb_sectors >> 2;
if (total_sectors == 0) {
return -ASC_MEDIUM_NOT_PRESENT;
}
buf[4] = 1; /* DVD-ROM, part version 1 */
buf[5] = 0xf; /* 120mm disc, minimum rate unspecified */
buf[6] = 1; /* one layer, read-only (per MMC-2 spec) */
buf[7] = 0; /* default densities */
/* FIXME: 0x30000 per spec? */
stl_be_p(buf + 8, 0); /* start sector */
stl_be_p(buf + 12, total_sectors - 1); /* end sector */
stl_be_p(buf + 16, total_sectors - 1); /* l0 end sector */
/* Size of buffer, not including 2 byte size field */
stw_be_p(buf, 2048 + 2);
/* 2k data + 4 byte header */
return (2048 + 4);
}
case 0x01: /* DVD copyright information */
buf[4] = 0; /* no copyright data */
buf[5] = 0; /* no region restrictions */
/* Size of buffer, not including 2 byte size field */
stw_be_p(buf, 4 + 2);
/* 4 byte header + 4 byte data */
return (4 + 4);
case 0x03: /* BCA information - invalid field for no BCA info */
return -ASC_INV_FIELD_IN_CMD_PACKET;
case 0x04: /* DVD disc manufacturing information */
/* Size of buffer, not including 2 byte size field */
stw_be_p(buf, 2048 + 2);
/* 2k data + 4 byte header */
return (2048 + 4);
case 0xff:
/*
* This lists all the command capabilities above. Add new ones
* in order and update the length and buffer return values.
*/
buf[4] = 0x00; /* Physical format */
buf[5] = 0x40; /* Not writable, is readable */
stw_be_p(buf + 6, 2048 + 4);
buf[8] = 0x01; /* Copyright info */
buf[9] = 0x40; /* Not writable, is readable */
stw_be_p(buf + 10, 4 + 4);
buf[12] = 0x03; /* BCA info */
buf[13] = 0x40; /* Not writable, is readable */
stw_be_p(buf + 14, 188 + 4);
buf[16] = 0x04; /* Manufacturing info */
buf[17] = 0x40; /* Not writable, is readable */
stw_be_p(buf + 18, 2048 + 4);
/* Size of buffer, not including 2 byte size field */
stw_be_p(buf, 16 + 2);
/* data written + 4 byte header */
return (16 + 4);
default: /* TODO: formats beyond DVD-ROM requires */
return -ASC_INV_FIELD_IN_CMD_PACKET;
}
}
static unsigned int event_status_media(IDEState *s,
uint8_t *buf)
{
uint8_t event_code, media_status;
media_status = 0;
if (s->tray_open) {
media_status = MS_TRAY_OPEN;
} else if (blk_is_inserted(s->blk)) {
media_status = MS_MEDIA_PRESENT;
}
/* Event notification descriptor */
event_code = MEC_NO_CHANGE;
if (media_status != MS_TRAY_OPEN) {
if (s->events.new_media) {
event_code = MEC_NEW_MEDIA;
s->events.new_media = false;
} else if (s->events.eject_request) {
event_code = MEC_EJECT_REQUESTED;
s->events.eject_request = false;
}
}
buf[4] = event_code;
buf[5] = media_status;
/* These fields are reserved, just clear them. */
buf[6] = 0;
buf[7] = 0;
return 8; /* We wrote to 4 extra bytes from the header */
}
/*
* Before transferring data or otherwise signalling acceptance of a command
* marked CONDDATA, we must check the validity of the byte_count_limit.
*/
static bool validate_bcl(IDEState *s)
{
/* TODO: Check IDENTIFY data word 125 for defacult BCL (currently 0) */
if (s->atapi_dma || atapi_byte_count_limit(s)) {
return true;
}
/* TODO: Move abort back into core.c and introduce proper error flow between
* ATAPI layer and IDE core layer */
ide_abort_command(s);
return false;
}
static void cmd_get_event_status_notification(IDEState *s,
uint8_t *buf)
{
const uint8_t *packet = buf;
struct {
uint8_t opcode;
uint8_t polled; /* lsb bit is polled; others are reserved */
uint8_t reserved2[2];
uint8_t class;
uint8_t reserved3[2];
uint16_t len;
uint8_t control;
} QEMU_PACKED *gesn_cdb;
struct {
uint16_t len;
uint8_t notification_class;
uint8_t supported_events;
} QEMU_PACKED *gesn_event_header;
unsigned int max_len, used_len;
gesn_cdb = (void *)packet;
gesn_event_header = (void *)buf;
max_len = be16_to_cpu(gesn_cdb->len);
/* It is fine by the MMC spec to not support async mode operations */
if (!(gesn_cdb->polled & 0x01)) { /* asynchronous mode */
/* Only polling is supported, asynchronous mode is not. */
ide_atapi_cmd_error(s, ILLEGAL_REQUEST,
ASC_INV_FIELD_IN_CMD_PACKET);
return;
}
/* polling mode operation */
/*
* These are the supported events.
*
* We currently only support requests of the 'media' type.
* Notification class requests and supported event classes are bitmasks,
* but they are build from the same values as the "notification class"
* field.
*/
gesn_event_header->supported_events = 1 << GESN_MEDIA;
/*
* We use |= below to set the class field; other bits in this byte
* are reserved now but this is useful to do if we have to use the
* reserved fields later.
*/
gesn_event_header->notification_class = 0;
/*
* Responses to requests are to be based on request priority. The
* notification_class_request_type enum above specifies the
* priority: upper elements are higher prio than lower ones.
*/
if (gesn_cdb->class & (1 << GESN_MEDIA)) {
gesn_event_header->notification_class |= GESN_MEDIA;
used_len = event_status_media(s, buf);
} else {
gesn_event_header->notification_class = 0x80; /* No event available */
used_len = sizeof(*gesn_event_header);
}
gesn_event_header->len = cpu_to_be16(used_len
- sizeof(*gesn_event_header));
ide_atapi_cmd_reply(s, used_len, max_len);
}
static void cmd_request_sense(IDEState *s, uint8_t *buf)
{
int max_len = buf[4];
memset(buf, 0, 18);
buf[0] = 0x70 | (1 << 7);
buf[2] = s->sense_key;
buf[7] = 10;
buf[12] = s->asc;
if (s->sense_key == UNIT_ATTENTION) {
s->sense_key = NO_SENSE;
}
ide_atapi_cmd_reply(s, 18, max_len);
}
static void cmd_inquiry(IDEState *s, uint8_t *buf)
{
uint8_t page_code = buf[2];
int max_len = buf[4];
unsigned idx = 0;
unsigned size_idx;
unsigned preamble_len;
/* If the EVPD (Enable Vital Product Data) bit is set in byte 1,
* we are being asked for a specific page of info indicated by byte 2. */
if (buf[1] & 0x01) {
preamble_len = 4;
size_idx = 3;
buf[idx++] = 0x05; /* CD-ROM */
buf[idx++] = page_code; /* Page Code */
buf[idx++] = 0x00; /* reserved */
idx++; /* length (set later) */
switch (page_code) {
case 0x00:
/* Supported Pages: List of supported VPD responses. */
buf[idx++] = 0x00; /* 0x00: Supported Pages, and: */
buf[idx++] = 0x83; /* 0x83: Device Identification. */
break;
case 0x83:
/* Device Identification. Each entry is optional, but the entries
* included here are modeled after libata's VPD responses.
* If the response is given, at least one entry must be present. */
/* Entry 1: Serial */
if (idx + 24 > max_len) {
/* Not enough room for even the first entry: */
/* 4 byte header + 20 byte string */
ide_atapi_cmd_error(s, ILLEGAL_REQUEST,
ASC_DATA_PHASE_ERROR);
return;
}
buf[idx++] = 0x02; /* Ascii */
buf[idx++] = 0x00; /* Vendor Specific */
buf[idx++] = 0x00;
buf[idx++] = 20; /* Remaining length */
padstr8(buf + idx, 20, s->drive_serial_str);
idx += 20;
/* Entry 2: Drive Model and Serial */
if (idx + 72 > max_len) {
/* 4 (header) + 8 (vendor) + 60 (model & serial) */
goto out;
}
buf[idx++] = 0x02; /* Ascii */
buf[idx++] = 0x01; /* T10 Vendor */
buf[idx++] = 0x00;
buf[idx++] = 68;
padstr8(buf + idx, 8, "ATA"); /* Generic T10 vendor */
idx += 8;
padstr8(buf + idx, 40, s->drive_model_str);
idx += 40;
padstr8(buf + idx, 20, s->drive_serial_str);
idx += 20;
/* Entry 3: WWN */
if (s->wwn && (idx + 12 <= max_len)) {
/* 4 byte header + 8 byte wwn */
buf[idx++] = 0x01; /* Binary */
buf[idx++] = 0x03; /* NAA */
buf[idx++] = 0x00;
buf[idx++] = 0x08;
stq_be_p(&buf[idx], s->wwn);
idx += 8;
}
break;
default:
/* SPC-3, revision 23 sec. 6.4 */
ide_atapi_cmd_error(s, ILLEGAL_REQUEST,
ASC_INV_FIELD_IN_CMD_PACKET);
return;
}
} else {
preamble_len = 5;
size_idx = 4;
buf[0] = 0x05; /* CD-ROM */
buf[1] = 0x80; /* removable */
buf[2] = 0x00; /* ISO */
buf[3] = 0x21; /* ATAPI-2 (XXX: put ATAPI-4 ?) */
/* buf[size_idx] set below. */
buf[5] = 0; /* reserved */
buf[6] = 0; /* reserved */
buf[7] = 0; /* reserved */
padstr8(buf + 8, 8, "QEMU");
padstr8(buf + 16, 16, "QEMU DVD-ROM");
padstr8(buf + 32, 4, s->version);
idx = 36;
}
out:
buf[size_idx] = idx - preamble_len;
ide_atapi_cmd_reply(s, idx, max_len);
}
static void cmd_get_configuration(IDEState *s, uint8_t *buf)
{
uint32_t len;
uint8_t index = 0;
int max_len;
/* only feature 0 is supported */
if (buf[2] != 0 || buf[3] != 0) {
ide_atapi_cmd_error(s, ILLEGAL_REQUEST,
ASC_INV_FIELD_IN_CMD_PACKET);
return;
}
/* XXX: could result in alignment problems in some architectures */
max_len = lduw_be_p(buf + 7);
/*
* XXX: avoid overflow for io_buffer if max_len is bigger than
* the size of that buffer (dimensioned to max number of
* sectors to transfer at once)
*
* Only a problem if the feature/profiles grow.
*/
if (max_len > BDRV_SECTOR_SIZE) {
/* XXX: assume 1 sector */
max_len = BDRV_SECTOR_SIZE;
}
memset(buf, 0, max_len);
/*
* the number of sectors from the media tells us which profile
* to use as current. 0 means there is no media
*/
if (media_is_dvd(s)) {
stw_be_p(buf + 6, MMC_PROFILE_DVD_ROM);
} else if (media_is_cd(s)) {
stw_be_p(buf + 6, MMC_PROFILE_CD_ROM);
}
buf[10] = 0x02 | 0x01; /* persistent and current */
len = 12; /* headers: 8 + 4 */
len += ide_atapi_set_profile(buf, &index, MMC_PROFILE_DVD_ROM);
len += ide_atapi_set_profile(buf, &index, MMC_PROFILE_CD_ROM);
stl_be_p(buf, len - 4); /* data length */
ide_atapi_cmd_reply(s, len, max_len);
}
static void cmd_mode_sense(IDEState *s, uint8_t *buf)
{
int action, code;
int max_len;
max_len = lduw_be_p(buf + 7);
action = buf[2] >> 6;
code = buf[2] & 0x3f;
switch(action) {
case 0: /* current values */
switch(code) {
case MODE_PAGE_R_W_ERROR: /* error recovery */
stw_be_p(&buf[0], 16 - 2);
buf[2] = 0x70;
buf[3] = 0;
buf[4] = 0;
buf[5] = 0;
buf[6] = 0;
buf[7] = 0;
buf[8] = MODE_PAGE_R_W_ERROR;
buf[9] = 16 - 10;
buf[10] = 0x00;
buf[11] = 0x05;
buf[12] = 0x00;
buf[13] = 0x00;
buf[14] = 0x00;
buf[15] = 0x00;
ide_atapi_cmd_reply(s, 16, max_len);
break;
case MODE_PAGE_AUDIO_CTL:
stw_be_p(&buf[0], 24 - 2);
buf[2] = 0x70;
buf[3] = 0;
buf[4] = 0;
buf[5] = 0;
buf[6] = 0;
buf[7] = 0;
buf[8] = MODE_PAGE_AUDIO_CTL;
buf[9] = 24 - 10;
/* Fill with CDROM audio volume */
buf[17] = 0;
buf[19] = 0;
buf[21] = 0;
buf[23] = 0;
ide_atapi_cmd_reply(s, 24, max_len);
break;
case MODE_PAGE_CAPABILITIES:
stw_be_p(&buf[0], 30 - 2);
buf[2] = 0x70;
buf[3] = 0;
buf[4] = 0;
buf[5] = 0;
buf[6] = 0;
buf[7] = 0;
buf[8] = MODE_PAGE_CAPABILITIES;
buf[9] = 30 - 10;
buf[10] = 0x3b; /* read CDR/CDRW/DVDROM/DVDR/DVDRAM */
buf[11] = 0x00;
/* Claim PLAY_AUDIO capability (0x01) since some Linux
code checks for this to automount media. */
buf[12] = 0x71;
buf[13] = 3 << 5;
buf[14] = (1 << 0) | (1 << 3) | (1 << 5);
if (s->tray_locked) {
buf[14] |= 1 << 1;
}
buf[15] = 0x00; /* No volume & mute control, no changer */
stw_be_p(&buf[16], 704); /* 4x read speed */
buf[18] = 0; /* Two volume levels */
buf[19] = 2;
stw_be_p(&buf[20], 512); /* 512k buffer */
stw_be_p(&buf[22], 704); /* 4x read speed current */
buf[24] = 0;
buf[25] = 0;
buf[26] = 0;
buf[27] = 0;
buf[28] = 0;
buf[29] = 0;
ide_atapi_cmd_reply(s, 30, max_len);
break;
default:
goto error_cmd;
}
break;
case 1: /* changeable values */
goto error_cmd;
case 2: /* default values */
goto error_cmd;
default:
case 3: /* saved values */
ide_atapi_cmd_error(s, ILLEGAL_REQUEST,
ASC_SAVING_PARAMETERS_NOT_SUPPORTED);
break;
}
return;
error_cmd:
ide_atapi_cmd_error(s, ILLEGAL_REQUEST, ASC_INV_FIELD_IN_CMD_PACKET);
}
static void cmd_test_unit_ready(IDEState *s, uint8_t *buf)
{
/* Not Ready Conditions are already handled in ide_atapi_cmd(), so if we
* come here, we know that it's ready. */
ide_atapi_cmd_ok(s);
}
static void cmd_prevent_allow_medium_removal(IDEState *s, uint8_t* buf)
{
s->tray_locked = buf[4] & 1;
blk_lock_medium(s->blk, buf[4] & 1);
ide_atapi_cmd_ok(s);
}
static void cmd_read(IDEState *s, uint8_t* buf)
{
unsigned int nb_sectors, lba;
/* Total logical sectors of ATAPI_SECTOR_SIZE(=2048) bytes */
uint64_t total_sectors = s->nb_sectors >> 2;
if (buf[0] == GPCMD_READ_10) {
nb_sectors = lduw_be_p(buf + 7);
} else {
nb_sectors = ldl_be_p(buf + 6);
}
if (nb_sectors == 0) {
ide_atapi_cmd_ok(s);
return;
}
lba = ldl_be_p(buf + 2);
if (lba >= total_sectors || lba + nb_sectors - 1 >= total_sectors) {
ide_atapi_cmd_error(s, ILLEGAL_REQUEST, ASC_LOGICAL_BLOCK_OOR);
return;
}
ide_atapi_cmd_read(s, lba, nb_sectors, 2048);
}
static void cmd_read_cd(IDEState *s, uint8_t* buf)
{
unsigned int nb_sectors, lba, transfer_request;
/* Total logical sectors of ATAPI_SECTOR_SIZE(=2048) bytes */
uint64_t total_sectors = s->nb_sectors >> 2;
nb_sectors = (buf[6] << 16) | (buf[7] << 8) | buf[8];
if (nb_sectors == 0) {
ide_atapi_cmd_ok(s);
return;
}
lba = ldl_be_p(buf + 2);
if (lba >= total_sectors || lba + nb_sectors - 1 >= total_sectors) {
ide_atapi_cmd_error(s, ILLEGAL_REQUEST, ASC_LOGICAL_BLOCK_OOR);
return;
}
transfer_request = buf[9] & 0xf8;
if (transfer_request == 0x00) {
/* nothing */
ide_atapi_cmd_ok(s);
return;
}
/* Check validity of BCL before transferring data */
if (!validate_bcl(s)) {
return;
}
switch (transfer_request) {
case 0x10:
/* normal read */
ide_atapi_cmd_read(s, lba, nb_sectors, 2048);
break;
case 0xf8:
/* read all data */
ide_atapi_cmd_read(s, lba, nb_sectors, 2352);
break;
default:
ide_atapi_cmd_error(s, ILLEGAL_REQUEST,
ASC_INV_FIELD_IN_CMD_PACKET);
break;
}
}
static void cmd_seek(IDEState *s, uint8_t* buf)
{
unsigned int lba;
uint64_t total_sectors = s->nb_sectors >> 2;
lba = ldl_be_p(buf + 2);
if (lba >= total_sectors) {
ide_atapi_cmd_error(s, ILLEGAL_REQUEST, ASC_LOGICAL_BLOCK_OOR);
return;
}
ide_atapi_cmd_ok(s);
}
static void cmd_start_stop_unit(IDEState *s, uint8_t* buf)
{
int sense;
bool start = buf[4] & 1;
bool loej = buf[4] & 2; /* load on start, eject on !start */
int pwrcnd = buf[4] & 0xf0;
if (pwrcnd) {
/* eject/load only happens for power condition == 0 */
ide_atapi_cmd_ok(s);
return;
}
if (loej) {
if (!start && !s->tray_open && s->tray_locked) {
sense = blk_is_inserted(s->blk)
? NOT_READY : ILLEGAL_REQUEST;
ide_atapi_cmd_error(s, sense, ASC_MEDIA_REMOVAL_PREVENTED);
return;
}
if (s->tray_open != !start) {
blk_eject(s->blk, !start);
s->tray_open = !start;
}
}
ide_atapi_cmd_ok(s);
}
static void cmd_mechanism_status(IDEState *s, uint8_t* buf)
{
int max_len = lduw_be_p(buf + 8);
stw_be_p(buf, 0);
/* no current LBA */
buf[2] = 0;
buf[3] = 0;
buf[4] = 0;
buf[5] = 1;
stw_be_p(buf + 6, 0);
ide_atapi_cmd_reply(s, 8, max_len);
}
static void cmd_read_toc_pma_atip(IDEState *s, uint8_t* buf)
{
int format, msf, start_track, len;
int max_len;
uint64_t total_sectors = s->nb_sectors >> 2;
max_len = lduw_be_p(buf + 7);
format = buf[9] >> 6;
msf = (buf[1] >> 1) & 1;
start_track = buf[6];
switch(format) {
case 0:
len = cdrom_read_toc(total_sectors, buf, msf, start_track);
if (len < 0)
goto error_cmd;
ide_atapi_cmd_reply(s, len, max_len);
break;
case 1:
/* multi session : only a single session defined */
memset(buf, 0, 12);
buf[1] = 0x0a;
buf[2] = 0x01;
buf[3] = 0x01;
ide_atapi_cmd_reply(s, 12, max_len);
break;
case 2:
len = cdrom_read_toc_raw(total_sectors, buf, msf, start_track);
if (len < 0)
goto error_cmd;
ide_atapi_cmd_reply(s, len, max_len);
break;
default:
error_cmd:
ide_atapi_cmd_error(s, ILLEGAL_REQUEST,
ASC_INV_FIELD_IN_CMD_PACKET);
}
}
static void cmd_read_cdvd_capacity(IDEState *s, uint8_t* buf)
{
uint64_t total_sectors = s->nb_sectors >> 2;
/* NOTE: it is really the number of sectors minus 1 */
stl_be_p(buf, total_sectors - 1);
stl_be_p(buf + 4, 2048);
ide_atapi_cmd_reply(s, 8, 8);
}
static void cmd_read_disc_information(IDEState *s, uint8_t* buf)
{
uint8_t type = buf[1] & 7;
uint32_t max_len = lduw_be_p(buf + 7);
/* Types 1/2 are only defined for Blu-Ray. */
if (type != 0) {
ide_atapi_cmd_error(s, ILLEGAL_REQUEST,
ASC_INV_FIELD_IN_CMD_PACKET);
return;
}
memset(buf, 0, 34);
buf[1] = 32;
buf[2] = 0xe; /* last session complete, disc finalized */
buf[3] = 1; /* first track on disc */
buf[4] = 1; /* # of sessions */
buf[5] = 1; /* first track of last session */
buf[6] = 1; /* last track of last session */
buf[7] = 0x20; /* unrestricted use */
buf[8] = 0x00; /* CD-ROM or DVD-ROM */
/* 9-10-11: most significant byte corresponding bytes 4-5-6 */
/* 12-23: not meaningful for CD-ROM or DVD-ROM */
/* 24-31: disc bar code */
/* 32: disc application code */
/* 33: number of OPC tables */
ide_atapi_cmd_reply(s, 34, max_len);
}
static void cmd_read_dvd_structure(IDEState *s, uint8_t* buf)
{
int max_len;
int media = buf[1];
int format = buf[7];
int ret;
max_len = lduw_be_p(buf + 8);
if (format < 0xff) {
if (media_is_cd(s)) {
ide_atapi_cmd_error(s, ILLEGAL_REQUEST,
ASC_INCOMPATIBLE_FORMAT);
return;
} else if (!media_present(s)) {
ide_atapi_cmd_error(s, ILLEGAL_REQUEST,
ASC_INV_FIELD_IN_CMD_PACKET);
return;
}
}
memset(buf, 0, max_len > IDE_DMA_BUF_SECTORS * BDRV_SECTOR_SIZE + 4 ?
IDE_DMA_BUF_SECTORS * BDRV_SECTOR_SIZE + 4 : max_len);
switch (format) {
case 0x00 ... 0x7f:
case 0xff:
if (media == 0) {
ret = ide_dvd_read_structure(s, format, buf, buf);
if (ret < 0) {
ide_atapi_cmd_error(s, ILLEGAL_REQUEST, -ret);
} else {
ide_atapi_cmd_reply(s, ret, max_len);
}
break;
}
/* TODO: BD support, fall through for now */
/* Generic disk structures */
case 0x80: /* TODO: AACS volume identifier */
case 0x81: /* TODO: AACS media serial number */
case 0x82: /* TODO: AACS media identifier */
case 0x83: /* TODO: AACS media key block */
case 0x90: /* TODO: List of recognized format layers */
case 0xc0: /* TODO: Write protection status */
default:
ide_atapi_cmd_error(s, ILLEGAL_REQUEST,
ASC_INV_FIELD_IN_CMD_PACKET);
break;
}
}
static void cmd_set_speed(IDEState *s, uint8_t* buf)
{
ide_atapi_cmd_ok(s);
}
enum {
/*
* Only commands flagged as ALLOW_UA are allowed to run under a
* unit attention condition. (See MMC-5, section 4.1.6.1)
*/
ALLOW_UA = 0x01,
/*
* Commands flagged with CHECK_READY can only execute if a medium is present.
* Otherwise they report the Not Ready Condition. (See MMC-5, section
* 4.1.8)
*/
CHECK_READY = 0x02,
/*
* Commands flagged with NONDATA do not in any circumstances return
* any data via ide_atapi_cmd_reply. These commands are exempt from
* the normal byte_count_limit constraints.
* See ATA8-ACS3 "7.21.5 Byte Count Limit"
*/
NONDATA = 0x04,
/*
* CONDDATA implies a command that transfers data only conditionally based
* on the presence of suboptions. It should be exempt from the BCL check at
* command validation time, but it needs to be checked at the command
* handler level instead.
*/
CONDDATA = 0x08,
};
static const struct AtapiCmd {
void (*handler)(IDEState *s, uint8_t *buf);
int flags;
} atapi_cmd_table[0x100] = {
[ 0x00 ] = { cmd_test_unit_ready, CHECK_READY | NONDATA },
[ 0x03 ] = { cmd_request_sense, ALLOW_UA },
[ 0x12 ] = { cmd_inquiry, ALLOW_UA },
[ 0x1b ] = { cmd_start_stop_unit, NONDATA }, /* [1] */
[ 0x1e ] = { cmd_prevent_allow_medium_removal, NONDATA },
[ 0x25 ] = { cmd_read_cdvd_capacity, CHECK_READY },
[ 0x28 ] = { cmd_read, /* (10) */ CHECK_READY },
[ 0x2b ] = { cmd_seek, CHECK_READY | NONDATA },
[ 0x43 ] = { cmd_read_toc_pma_atip, CHECK_READY },
[ 0x46 ] = { cmd_get_configuration, ALLOW_UA },
[ 0x4a ] = { cmd_get_event_status_notification, ALLOW_UA },
[ 0x51 ] = { cmd_read_disc_information, CHECK_READY },
[ 0x5a ] = { cmd_mode_sense, /* (10) */ 0 },
[ 0xa8 ] = { cmd_read, /* (12) */ CHECK_READY },
[ 0xad ] = { cmd_read_dvd_structure, CHECK_READY },
[ 0xbb ] = { cmd_set_speed, NONDATA },
[ 0xbd ] = { cmd_mechanism_status, 0 },
[ 0xbe ] = { cmd_read_cd, CHECK_READY | CONDDATA },
/* [1] handler detects and reports not ready condition itself */
};
void ide_atapi_cmd(IDEState *s)
{
uint8_t *buf = s->io_buffer;
const struct AtapiCmd *cmd = &atapi_cmd_table[s->io_buffer[0]];
trace_ide_atapi_cmd(s, s->io_buffer[0]);
if (trace_event_get_state_backends(TRACE_IDE_ATAPI_CMD_PACKET)) {
/* Each pretty-printed byte needs two bytes and a space; */
char *ppacket = g_malloc(ATAPI_PACKET_SIZE * 3 + 1);
int i;
for (i = 0; i < ATAPI_PACKET_SIZE; i++) {
sprintf(ppacket + (i * 3), "%02x ", buf[i]);
}
trace_ide_atapi_cmd_packet(s, s->lcyl | (s->hcyl << 8), ppacket);
g_free(ppacket);
}
/*
* If there's a UNIT_ATTENTION condition pending, only command flagged with
* ALLOW_UA are allowed to complete. with other commands getting a CHECK
* condition response unless a higher priority status, defined by the drive
* here, is pending.
*/
if (s->sense_key == UNIT_ATTENTION && !(cmd->flags & ALLOW_UA)) {
ide_atapi_cmd_check_status(s);
return;
}
/*
* When a CD gets changed, we have to report an ejected state and
* then a loaded state to guests so that they detect tray
* open/close and media change events. Guests that do not use
* GET_EVENT_STATUS_NOTIFICATION to detect such tray open/close
* states rely on this behavior.
*/
if (!(cmd->flags & ALLOW_UA) &&
!s->tray_open && blk_is_inserted(s->blk) && s->cdrom_changed) {
if (s->cdrom_changed == 1) {
ide_atapi_cmd_error(s, NOT_READY, ASC_MEDIUM_NOT_PRESENT);
s->cdrom_changed = 2;
} else {
ide_atapi_cmd_error(s, UNIT_ATTENTION, ASC_MEDIUM_MAY_HAVE_CHANGED);
s->cdrom_changed = 0;
}
return;
}
/* Report a Not Ready condition if appropriate for the command */
if ((cmd->flags & CHECK_READY) &&
(!media_present(s) || !blk_is_inserted(s->blk)))
{
ide_atapi_cmd_error(s, NOT_READY, ASC_MEDIUM_NOT_PRESENT);
return;
}
/* Commands that don't transfer DATA permit the byte_count_limit to be 0.
* If this is a data-transferring PIO command and BCL is 0,
* we abort at the /ATA/ level, not the ATAPI level.
* See ATA8 ACS3 section 7.17.6.49 and 7.21.5 */
if (cmd->handler && !(cmd->flags & (NONDATA | CONDDATA))) {
if (!validate_bcl(s)) {
return;
}
}
/* Execute the command */
if (cmd->handler) {
cmd->handler(s, buf);
return;
}
ide_atapi_cmd_error(s, ILLEGAL_REQUEST, ASC_ILLEGAL_OPCODE);
}
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