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u-boot/drivers/dfu/dfu_mmc.c
Masami Hiramatsu 53b406369e DFU: Check the number of arguments and argument string strictly 
When parsing the dfu_alt_info, check the number of arguments
and argument string strictly. If there is any garbage data
(which is not able to be parsed correctly) in dfu_alt_info,
that means something wrong and user may make a typo or mis-
understanding about the syntax. Since the dfu_alt_info is
used for updating the firmware, this mistake may lead to
brick the hardware.
Thus it should be checked strictly for making sure there
is no mistake.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu@linaro.org>
2022-02-11 11:29:23 -05:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* dfu.c -- DFU back-end routines
*
* Copyright (C) 2012 Samsung Electronics
* author: Lukasz Majewski <l.majewski@samsung.com>
*/
#include <common.h>
#include <log.h>
#include <malloc.h>
#include <errno.h>
#include <div64.h>
#include <dfu.h>
#include <ext4fs.h>
#include <fat.h>
#include <mmc.h>
#include <part.h>
#include <command.h>
static unsigned char *dfu_file_buf;
static u64 dfu_file_buf_len;
static u64 dfu_file_buf_offset;
static int mmc_block_op(enum dfu_op op, struct dfu_entity *dfu,
u64 offset, void *buf, long *len)
{
struct mmc *mmc;
u32 blk_start, blk_count, n = 0;
int ret, part_num_bkp = 0;
mmc = find_mmc_device(dfu->data.mmc.dev_num);
if (!mmc) {
pr_err("Device MMC %d - not found!", dfu->data.mmc.dev_num);
return -ENODEV;
}
/*
* We must ensure that we work in lba_blk_size chunks, so ALIGN
* this value.
*/
*len = ALIGN(*len, dfu->data.mmc.lba_blk_size);
blk_start = dfu->data.mmc.lba_start +
(u32)lldiv(offset, dfu->data.mmc.lba_blk_size);
blk_count = *len / dfu->data.mmc.lba_blk_size;
if (blk_start + blk_count >
dfu->data.mmc.lba_start + dfu->data.mmc.lba_size) {
puts("Request would exceed designated area!\n");
return -EINVAL;
}
if (dfu->data.mmc.hw_partition >= 0) {
part_num_bkp = mmc_get_blk_desc(mmc)->hwpart;
ret = blk_select_hwpart_devnum(IF_TYPE_MMC,
dfu->data.mmc.dev_num,
dfu->data.mmc.hw_partition);
if (ret)
return ret;
}
debug("%s: %s dev: %d start: %d cnt: %d buf: 0x%p\n", __func__,
op == DFU_OP_READ ? "MMC READ" : "MMC WRITE",
dfu->data.mmc.dev_num, blk_start, blk_count, buf);
switch (op) {
case DFU_OP_READ:
n = blk_dread(mmc_get_blk_desc(mmc), blk_start, blk_count, buf);
break;
case DFU_OP_WRITE:
n = blk_dwrite(mmc_get_blk_desc(mmc), blk_start, blk_count,
buf);
break;
default:
pr_err("Operation not supported\n");
}
if (n != blk_count) {
pr_err("MMC operation failed");
if (dfu->data.mmc.hw_partition >= 0)
blk_select_hwpart_devnum(IF_TYPE_MMC,
dfu->data.mmc.dev_num,
part_num_bkp);
return -EIO;
}
if (dfu->data.mmc.hw_partition >= 0) {
ret = blk_select_hwpart_devnum(IF_TYPE_MMC,
dfu->data.mmc.dev_num,
part_num_bkp);
if (ret)
return ret;
}
return 0;
}
static int mmc_file_op(enum dfu_op op, struct dfu_entity *dfu,
u64 offset, void *buf, u64 *len)
{
char dev_part_str[8];
int ret;
int fstype;
loff_t size = 0;
switch (dfu->layout) {
case DFU_FS_FAT:
fstype = FS_TYPE_FAT;
break;
case DFU_FS_EXT4:
fstype = FS_TYPE_EXT;
break;
case DFU_SKIP:
return 0;
default:
printf("%s: Layout (%s) not (yet) supported!\n", __func__,
dfu_get_layout(dfu->layout));
return -1;
}
snprintf(dev_part_str, sizeof(dev_part_str), "%d:%d",
dfu->data.mmc.dev, dfu->data.mmc.part);
ret = fs_set_blk_dev("mmc", dev_part_str, fstype);
if (ret) {
puts("dfu: fs_set_blk_dev error!\n");
return ret;
}
switch (op) {
case DFU_OP_READ:
ret = fs_read(dfu->name, (size_t)buf, offset, *len, &size);
if (ret) {
puts("dfu: fs_read error!\n");
return ret;
}
*len = size;
break;
case DFU_OP_WRITE:
ret = fs_write(dfu->name, (size_t)buf, offset, *len, &size);
if (ret) {
puts("dfu: fs_write error!\n");
return ret;
}
break;
case DFU_OP_SIZE:
ret = fs_size(dfu->name, &size);
if (ret) {
puts("dfu: fs_size error!\n");
return ret;
}
*len = size;
break;
default:
return -1;
}
return ret;
}
static int mmc_file_buf_write(struct dfu_entity *dfu, u64 offset, void *buf, long *len)
{
int ret = 0;
if (offset == 0) {
dfu_file_buf_len = 0;
dfu_file_buf_offset = 0;
}
/* Add to the current buffer. */
if (dfu_file_buf_len + *len > CONFIG_SYS_DFU_MAX_FILE_SIZE)
*len = CONFIG_SYS_DFU_MAX_FILE_SIZE - dfu_file_buf_len;
memcpy(dfu_file_buf + dfu_file_buf_len, buf, *len);
dfu_file_buf_len += *len;
if (dfu_file_buf_len == CONFIG_SYS_DFU_MAX_FILE_SIZE) {
ret = mmc_file_op(DFU_OP_WRITE, dfu, dfu_file_buf_offset,
dfu_file_buf, &dfu_file_buf_len);
dfu_file_buf_offset += dfu_file_buf_len;
dfu_file_buf_len = 0;
}
return ret;
}
static int mmc_file_buf_write_finish(struct dfu_entity *dfu)
{
int ret = mmc_file_op(DFU_OP_WRITE, dfu, dfu_file_buf_offset,
dfu_file_buf, &dfu_file_buf_len);
/* Now that we're done */
dfu_file_buf_len = 0;
dfu_file_buf_offset = 0;
return ret;
}
int dfu_write_medium_mmc(struct dfu_entity *dfu,
u64 offset, void *buf, long *len)
{
int ret = -1;
switch (dfu->layout) {
case DFU_RAW_ADDR:
ret = mmc_block_op(DFU_OP_WRITE, dfu, offset, buf, len);
break;
case DFU_FS_FAT:
case DFU_FS_EXT4:
ret = mmc_file_buf_write(dfu, offset, buf, len);
break;
case DFU_SCRIPT:
ret = run_command_list(buf, *len, 0);
break;
case DFU_SKIP:
ret = 0;
break;
default:
printf("%s: Layout (%s) not (yet) supported!\n", __func__,
dfu_get_layout(dfu->layout));
}
return ret;
}
int dfu_flush_medium_mmc(struct dfu_entity *dfu)
{
int ret = 0;
switch (dfu->layout) {
case DFU_FS_FAT:
case DFU_FS_EXT4:
ret = mmc_file_buf_write_finish(dfu);
break;
case DFU_SCRIPT:
/* script may have changed the dfu_alt_info */
dfu_reinit_needed = true;
break;
case DFU_RAW_ADDR:
case DFU_SKIP:
break;
default:
printf("%s: Layout (%s) not (yet) supported!\n", __func__,
dfu_get_layout(dfu->layout));
}
return ret;
}
int dfu_get_medium_size_mmc(struct dfu_entity *dfu, u64 *size)
{
int ret;
switch (dfu->layout) {
case DFU_RAW_ADDR:
*size = dfu->data.mmc.lba_size * dfu->data.mmc.lba_blk_size;
return 0;
case DFU_FS_FAT:
case DFU_FS_EXT4:
ret = mmc_file_op(DFU_OP_SIZE, dfu, 0, NULL, size);
if (ret < 0)
return ret;
return 0;
case DFU_SCRIPT:
case DFU_SKIP:
return 0;
default:
printf("%s: Layout (%s) not (yet) supported!\n", __func__,
dfu_get_layout(dfu->layout));
return -1;
}
}
static int mmc_file_buf_read(struct dfu_entity *dfu, u64 offset, void *buf,
long *len)
{
int ret;
if (offset == 0 || offset >= dfu_file_buf_offset + dfu_file_buf_len ||
offset + *len < dfu_file_buf_offset) {
u64 file_len = CONFIG_SYS_DFU_MAX_FILE_SIZE;
ret = mmc_file_op(DFU_OP_READ, dfu, offset, dfu_file_buf,
&file_len);
if (ret < 0)
return ret;
dfu_file_buf_len = file_len;
dfu_file_buf_offset = offset;
}
if (offset + *len > dfu_file_buf_offset + dfu_file_buf_len)
return -EINVAL;
/* Add to the current buffer. */
memcpy(buf, dfu_file_buf + offset - dfu_file_buf_offset, *len);
return 0;
}
int dfu_read_medium_mmc(struct dfu_entity *dfu, u64 offset, void *buf,
long *len)
{
int ret = -1;
switch (dfu->layout) {
case DFU_RAW_ADDR:
ret = mmc_block_op(DFU_OP_READ, dfu, offset, buf, len);
break;
case DFU_FS_FAT:
case DFU_FS_EXT4:
ret = mmc_file_buf_read(dfu, offset, buf, len);
break;
default:
printf("%s: Layout (%s) not (yet) supported!\n", __func__,
dfu_get_layout(dfu->layout));
}
return ret;
}
void dfu_free_entity_mmc(struct dfu_entity *dfu)
{
if (dfu_file_buf) {
free(dfu_file_buf);
dfu_file_buf = NULL;
}
}
/*
* @param s Parameter string containing space-separated arguments:
* 1st:
* raw (raw read/write)
* fat (files)
* ext4 (^)
* part (partition image)
* 2nd and 3rd:
* lba_start and lba_size, for raw write
* mmc_dev and mmc_part, for filesystems and part
* 4th (optional):
* mmcpart <num> (access to HW eMMC partitions)
*/
int dfu_fill_entity_mmc(struct dfu_entity *dfu, char *devstr, char **argv, int argc)
{
const char *entity_type;
ssize_t second_arg;
size_t third_arg;
struct mmc *mmc;
char *s;
if (argc < 3) {
pr_err("The number of parameters are not enough.\n");
return -EINVAL;
}
dfu->data.mmc.dev_num = dectoul(devstr, &s);
if (*s)
return -EINVAL;
entity_type = argv[0];
/*
* Base 0 means we'll accept (prefixed with 0x or 0) base 16, 8,
* with default 10.
*/
second_arg = simple_strtol(argv[1], &s, 0);
if (*s)
return -EINVAL;
third_arg = simple_strtoul(argv[2], &s, 0);
if (*s)
return -EINVAL;
mmc = find_mmc_device(dfu->data.mmc.dev_num);
if (mmc == NULL) {
pr_err("Couldn't find MMC device no. %d.\n",
dfu->data.mmc.dev_num);
return -ENODEV;
}
if (mmc_init(mmc)) {
pr_err("Couldn't init MMC device.\n");
return -ENODEV;
}
dfu->data.mmc.hw_partition = -EINVAL;
if (!strcmp(entity_type, "raw")) {
dfu->layout = DFU_RAW_ADDR;
dfu->data.mmc.lba_start = second_arg;
dfu->data.mmc.lba_size = third_arg;
dfu->data.mmc.lba_blk_size = mmc->read_bl_len;
/*
* Check for an extra entry at dfu_alt_info env variable
* specifying the mmc HW defined partition number
*/
if (argc > 3) {
if (argc != 5 || strcmp(argv[3], "mmcpart")) {
pr_err("DFU mmc raw accept 'mmcpart <partnum>' option.\n");
return -EINVAL;
}
dfu->data.mmc.hw_partition =
simple_strtoul(argv[4], NULL, 0);
}
} else if (!strcmp(entity_type, "part")) {
struct disk_partition partinfo;
struct blk_desc *blk_dev = mmc_get_blk_desc(mmc);
int mmcdev = second_arg;
int mmcpart = third_arg;
int offset = 0;
if (part_get_info(blk_dev, mmcpart, &partinfo) != 0) {
pr_err("Couldn't find part #%d on mmc device #%d\n",
mmcpart, mmcdev);
return -ENODEV;
}
/*
* Check for an extra entry at dfu_alt_info env variable
* specifying the mmc HW defined partition number
*/
if (argc > 3) {
if (argc != 5 || strcmp(argv[3], "offset")) {
pr_err("DFU mmc raw accept 'mmcpart <partnum>' option.\n");
return -EINVAL;
}
dfu->data.mmc.hw_partition =
simple_strtoul(argv[4], NULL, 0);
}
dfu->layout = DFU_RAW_ADDR;
dfu->data.mmc.lba_start = partinfo.start + offset;
dfu->data.mmc.lba_size = partinfo.size - offset;
dfu->data.mmc.lba_blk_size = partinfo.blksz;
} else if (!strcmp(entity_type, "fat")) {
dfu->layout = DFU_FS_FAT;
} else if (!strcmp(entity_type, "ext4")) {
dfu->layout = DFU_FS_EXT4;
} else if (!strcmp(entity_type, "skip")) {
dfu->layout = DFU_SKIP;
} else if (!strcmp(entity_type, "script")) {
dfu->layout = DFU_SCRIPT;
} else {
pr_err("Memory layout (%s) not supported!\n", entity_type);
return -ENODEV;
}
/* if it's NOT a raw write */
if (strcmp(entity_type, "raw")) {
dfu->data.mmc.dev = (second_arg != -1) ? second_arg :
dfu->data.mmc.dev_num;
dfu->data.mmc.part = third_arg;
}
dfu->dev_type = DFU_DEV_MMC;
dfu->get_medium_size = dfu_get_medium_size_mmc;
dfu->read_medium = dfu_read_medium_mmc;
dfu->write_medium = dfu_write_medium_mmc;
dfu->flush_medium = dfu_flush_medium_mmc;
dfu->inited = 0;
dfu->free_entity = dfu_free_entity_mmc;
/* Check if file buffer is ready */
if (!dfu_file_buf) {
dfu_file_buf = memalign(CONFIG_SYS_CACHELINE_SIZE,
CONFIG_SYS_DFU_MAX_FILE_SIZE);
if (!dfu_file_buf) {
pr_err("Could not memalign 0x%x bytes",
CONFIG_SYS_DFU_MAX_FILE_SIZE);
return -ENOMEM;
}
}
return 0;
}
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