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u-boot/common/avb_verify.c
Usama Arif e61b41517d avb: Make AVB independent of fastboot 
AVB only uses CONFIG_FASTBOOT_BUF_ADDR from fastboot for memory.
This memory is used for assigning temporary buffers.
This can be assigned a new variable and used as CONFIG_AVB_BUF_ADDR.
This is to support future boards that support AVB but dont support
USB and therefore dont support FASTBOOT.

Signed-off-by: Usama Arif <usama.arif@arm.com>
Cc: Igor Opaniuk <igor.opaniuk@gmail.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Acked-by: Igor Opaniuk <igor.opaniuk@gmail.com>
[trini: Change defaults]
Signed-off-by: Tom Rini <trini@konsulko.com>
2020-08-24 14:11:13 -04:00

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29 KiB
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/*
* (C) Copyright 2018, Linaro Limited
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <avb_verify.h>
#include <blk.h>
#include <cpu_func.h>
#include <image.h>
#include <malloc.h>
#include <part.h>
#include <tee.h>
#include <tee/optee_ta_avb.h>
static const unsigned char avb_root_pub[1032] = {
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0xb6, 0xd4, 0x4e, 0xdf, 0x71, 0xac, 0xdb, 0x2a, 0x4, 0xd4,
0xb4, 0x21, 0xba, 0x65, 0x56, 0x57, 0xe8, 0xfa, 0x84, 0xa2,
0x7d, 0x13, 0xe, 0xaf, 0xd7, 0x9a, 0x58, 0x2a, 0xa3, 0x81,
0x84, 0x8d, 0x9, 0xa0, 0x6a, 0xc1, 0xbb, 0xd9, 0xf5, 0x86,
0xac, 0xbd, 0x75, 0x61, 0x9, 0xe6, 0x8c, 0x3d, 0x77, 0xb2,
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0x79, 0x21, 0xdf, 0xd7, 0x31, 0x30, 0xc4, 0x21, 0xdd, 0x34,
0x5b, 0xd2, 0x1a, 0x2b, 0x3e, 0x5d, 0xf7, 0xea, 0xca, 0x5,
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0x19, 0x10, 0x9c, 0x4, 0xa7, 0xf4, 0x28, 0x74, 0xc8, 0x6f,
0x63, 0x20, 0x2b, 0x46, 0x24, 0x26, 0x19, 0x1d, 0xd1, 0x2c,
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0xa, 0x27, 0x96, 0x9, 0x96, 0xac, 0x47, 0x65, 0x78, 0x68,
0x51, 0x98, 0xd6, 0xd8, 0xa6, 0x2d, 0xa0, 0xcf, 0xec, 0xe2,
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0x19, 0xbc, 0x63, 0xb, 0xfd, 0x4d, 0x88, 0xfe, 0x67, 0xac,
0xb8, 0xcc, 0x50, 0xb7, 0x68, 0xb3, 0x5b, 0xd6, 0x1e, 0x25,
0xfc, 0x5f, 0x3c, 0x8d, 0xb1, 0x33, 0x7c, 0xb3, 0x49, 0x1,
0x3f, 0x71, 0x55, 0xe, 0x51, 0xba, 0x61, 0x26, 0xfa, 0xea,
0xe5, 0xb5, 0xe8, 0xaa, 0xcf, 0xcd, 0x96, 0x9f, 0xd6, 0xc1,
0x5f, 0x53, 0x91, 0xad, 0x5, 0xde, 0x20, 0xe7, 0x51, 0xda,
0x5b, 0x95, 0x67, 0xed, 0xf4, 0xee, 0x42, 0x65, 0x70, 0x13,
0xb, 0x70, 0x14, 0x1c, 0xc9, 0xe0, 0x19, 0xca, 0x5f, 0xf5,
0x1d, 0x70, 0x4b, 0x6c, 0x6, 0x74, 0xec, 0xb5, 0x2e, 0x77,
0xe1, 0x74, 0xa1, 0xa3, 0x99, 0xa0, 0x85, 0x9e, 0xf1, 0xac,
0xd8, 0x7e,
};
/**
* ============================================================================
* Boot states support (GREEN, YELLOW, ORANGE, RED) and dm_verity
* ============================================================================
*/
char *avb_set_state(AvbOps *ops, enum avb_boot_state boot_state)
{
struct AvbOpsData *data;
char *cmdline = NULL;
if (!ops)
return NULL;
data = (struct AvbOpsData *)ops->user_data;
if (!data)
return NULL;
data->boot_state = boot_state;
switch (boot_state) {
case AVB_GREEN:
cmdline = "androidboot.verifiedbootstate=green";
break;
case AVB_YELLOW:
cmdline = "androidboot.verifiedbootstate=yellow";
break;
case AVB_ORANGE:
cmdline = "androidboot.verifiedbootstate=orange";
case AVB_RED:
break;
}
return cmdline;
}
char *append_cmd_line(char *cmdline_orig, char *cmdline_new)
{
char *cmd_line;
if (!cmdline_new)
return cmdline_orig;
if (cmdline_orig)
cmd_line = cmdline_orig;
else
cmd_line = " ";
cmd_line = avb_strdupv(cmd_line, " ", cmdline_new, NULL);
return cmd_line;
}
static int avb_find_dm_args(char **args, char *str)
{
int i;
if (!str)
return -1;
for (i = 0; i < AVB_MAX_ARGS && args[i]; ++i) {
if (strstr(args[i], str))
return i;
}
return -1;
}
static char *avb_set_enforce_option(const char *cmdline, const char *option)
{
char *cmdarg[AVB_MAX_ARGS];
char *newargs = NULL;
int i = 0;
int total_args;
memset(cmdarg, 0, sizeof(cmdarg));
cmdarg[i++] = strtok((char *)cmdline, " ");
do {
cmdarg[i] = strtok(NULL, " ");
if (!cmdarg[i])
break;
if (++i >= AVB_MAX_ARGS) {
printf("%s: Can't handle more then %d args\n",
__func__, i);
return NULL;
}
} while (true);
total_args = i;
i = avb_find_dm_args(&cmdarg[0], VERITY_TABLE_OPT_LOGGING);
if (i >= 0) {
cmdarg[i] = (char *)option;
} else {
i = avb_find_dm_args(&cmdarg[0], VERITY_TABLE_OPT_RESTART);
if (i < 0) {
printf("%s: No verity options found\n", __func__);
return NULL;
}
cmdarg[i] = (char *)option;
}
for (i = 0; i <= total_args; i++)
newargs = append_cmd_line(newargs, cmdarg[i]);
return newargs;
}
char *avb_set_ignore_corruption(const char *cmdline)
{
char *newargs = NULL;
newargs = avb_set_enforce_option(cmdline, VERITY_TABLE_OPT_LOGGING);
if (newargs)
newargs = append_cmd_line(newargs,
"androidboot.veritymode=eio");
return newargs;
}
char *avb_set_enforce_verity(const char *cmdline)
{
char *newargs;
newargs = avb_set_enforce_option(cmdline, VERITY_TABLE_OPT_RESTART);
if (newargs)
newargs = append_cmd_line(newargs,
"androidboot.veritymode=enforcing");
return newargs;
}
/**
* ============================================================================
* IO(mmc) auxiliary functions
* ============================================================================
*/
static unsigned long mmc_read_and_flush(struct mmc_part *part,
lbaint_t start,
lbaint_t sectors,
void *buffer)
{
unsigned long blks;
void *tmp_buf;
size_t buf_size;
bool unaligned = is_buf_unaligned(buffer);
if (start < part->info.start) {
printf("%s: partition start out of bounds\n", __func__);
return 0;
}
if ((start + sectors) > (part->info.start + part->info.size)) {
sectors = part->info.start + part->info.size - start;
printf("%s: read sector aligned to partition bounds (%ld)\n",
__func__, sectors);
}
/*
* Reading fails on unaligned buffers, so we have to
* use aligned temporary buffer and then copy to destination
*/
if (unaligned) {
printf("Handling unaligned read buffer..\n");
tmp_buf = get_sector_buf();
buf_size = get_sector_buf_size();
if (sectors > buf_size / part->info.blksz)
sectors = buf_size / part->info.blksz;
} else {
tmp_buf = buffer;
}
blks = blk_dread(part->mmc_blk,
start, sectors, tmp_buf);
/* flush cache after read */
flush_cache((ulong)tmp_buf, sectors * part->info.blksz);
if (unaligned)
memcpy(buffer, tmp_buf, sectors * part->info.blksz);
return blks;
}
static unsigned long mmc_write(struct mmc_part *part, lbaint_t start,
lbaint_t sectors, void *buffer)
{
void *tmp_buf;
size_t buf_size;
bool unaligned = is_buf_unaligned(buffer);
if (start < part->info.start) {
printf("%s: partition start out of bounds\n", __func__);
return 0;
}
if ((start + sectors) > (part->info.start + part->info.size)) {
sectors = part->info.start + part->info.size - start;
printf("%s: sector aligned to partition bounds (%ld)\n",
__func__, sectors);
}
if (unaligned) {
tmp_buf = get_sector_buf();
buf_size = get_sector_buf_size();
printf("Handling unaligned wrire buffer..\n");
if (sectors > buf_size / part->info.blksz)
sectors = buf_size / part->info.blksz;
memcpy(tmp_buf, buffer, sectors * part->info.blksz);
} else {
tmp_buf = buffer;
}
return blk_dwrite(part->mmc_blk,
start, sectors, tmp_buf);
}
static struct mmc_part *get_partition(AvbOps *ops, const char *partition)
{
int ret;
u8 dev_num;
int part_num = 0;
struct mmc_part *part;
struct blk_desc *mmc_blk;
part = malloc(sizeof(struct mmc_part));
if (!part)
return NULL;
dev_num = get_boot_device(ops);
part->mmc = find_mmc_device(dev_num);
if (!part->mmc) {
printf("No MMC device at slot %x\n", dev_num);
goto err;
}
if (mmc_init(part->mmc)) {
printf("MMC initialization failed\n");
goto err;
}
ret = mmc_switch_part(part->mmc, part_num);
if (ret)
goto err;
mmc_blk = mmc_get_blk_desc(part->mmc);
if (!mmc_blk) {
printf("Error - failed to obtain block descriptor\n");
goto err;
}
ret = part_get_info_by_name(mmc_blk, partition, &part->info);
if (!ret) {
printf("Can't find partition '%s'\n", partition);
goto err;
}
part->dev_num = dev_num;
part->mmc_blk = mmc_blk;
return part;
err:
free(part);
return NULL;
}
static AvbIOResult mmc_byte_io(AvbOps *ops,
const char *partition,
s64 offset,
size_t num_bytes,
void *buffer,
size_t *out_num_read,
enum mmc_io_type io_type)
{
ulong ret;
struct mmc_part *part;
u64 start_offset, start_sector, sectors, residue;
u8 *tmp_buf;
size_t io_cnt = 0;
if (!partition || !buffer || io_type > IO_WRITE)
return AVB_IO_RESULT_ERROR_IO;
part = get_partition(ops, partition);
if (!part)
return AVB_IO_RESULT_ERROR_NO_SUCH_PARTITION;
if (!part->info.blksz)
return AVB_IO_RESULT_ERROR_IO;
start_offset = calc_offset(part, offset);
while (num_bytes) {
start_sector = start_offset / part->info.blksz;
sectors = num_bytes / part->info.blksz;
/* handle non block-aligned reads */
if (start_offset % part->info.blksz ||
num_bytes < part->info.blksz) {
tmp_buf = get_sector_buf();
if (start_offset % part->info.blksz) {
residue = part->info.blksz -
(start_offset % part->info.blksz);
if (residue > num_bytes)
residue = num_bytes;
} else {
residue = num_bytes;
}
if (io_type == IO_READ) {
ret = mmc_read_and_flush(part,
part->info.start +
start_sector,
1, tmp_buf);
if (ret != 1) {
printf("%s: read error (%ld, %lld)\n",
__func__, ret, start_sector);
return AVB_IO_RESULT_ERROR_IO;
}
/*
* if this is not aligned at sector start,
* we have to adjust the tmp buffer
*/
tmp_buf += (start_offset % part->info.blksz);
memcpy(buffer, (void *)tmp_buf, residue);
} else {
ret = mmc_read_and_flush(part,
part->info.start +
start_sector,
1, tmp_buf);
if (ret != 1) {
printf("%s: read error (%ld, %lld)\n",
__func__, ret, start_sector);
return AVB_IO_RESULT_ERROR_IO;
}
memcpy((void *)tmp_buf +
start_offset % part->info.blksz,
buffer, residue);
ret = mmc_write(part, part->info.start +
start_sector, 1, tmp_buf);
if (ret != 1) {
printf("%s: write error (%ld, %lld)\n",
__func__, ret, start_sector);
return AVB_IO_RESULT_ERROR_IO;
}
}
io_cnt += residue;
buffer += residue;
start_offset += residue;
num_bytes -= residue;
continue;
}
if (sectors) {
if (io_type == IO_READ) {
ret = mmc_read_and_flush(part,
part->info.start +
start_sector,
sectors, buffer);
} else {
ret = mmc_write(part,
part->info.start +
start_sector,
sectors, buffer);
}
if (!ret) {
printf("%s: sector read error\n", __func__);
return AVB_IO_RESULT_ERROR_IO;
}
io_cnt += ret * part->info.blksz;
buffer += ret * part->info.blksz;
start_offset += ret * part->info.blksz;
num_bytes -= ret * part->info.blksz;
}
}
/* Set counter for read operation */
if (io_type == IO_READ && out_num_read)
*out_num_read = io_cnt;
return AVB_IO_RESULT_OK;
}
/**
* ============================================================================
* AVB 2.0 operations
* ============================================================================
*/
/**
* read_from_partition() - reads @num_bytes from @offset from partition
* identified by a string name
*
* @ops: contains AVB ops handlers
* @partition_name: partition name, NUL-terminated UTF-8 string
* @offset: offset from the beginning of partition
* @num_bytes: amount of bytes to read
* @buffer: destination buffer to store data
* @out_num_read:
*
* @return:
* AVB_IO_RESULT_OK, if partition was found and read operation succeed
* AVB_IO_RESULT_ERROR_IO, if i/o error occurred from the underlying i/o
* subsystem
* AVB_IO_RESULT_ERROR_NO_SUCH_PARTITION, if there is no partition with
* the given name
*/
static AvbIOResult read_from_partition(AvbOps *ops,
const char *partition_name,
s64 offset_from_partition,
size_t num_bytes,
void *buffer,
size_t *out_num_read)
{
return mmc_byte_io(ops, partition_name, offset_from_partition,
num_bytes, buffer, out_num_read, IO_READ);
}
/**
* write_to_partition() - writes N bytes to a partition identified by a string
* name
*
* @ops: AvbOps, contains AVB ops handlers
* @partition_name: partition name
* @offset_from_partition: offset from the beginning of partition
* @num_bytes: amount of bytes to write
* @buf: data to write
* @out_num_read:
*
* @return:
* AVB_IO_RESULT_OK, if partition was found and read operation succeed
* AVB_IO_RESULT_ERROR_IO, if input/output error occurred
* AVB_IO_RESULT_ERROR_NO_SUCH_PARTITION, if partition, specified in
* @partition_name was not found
*/
static AvbIOResult write_to_partition(AvbOps *ops,
const char *partition_name,
s64 offset_from_partition,
size_t num_bytes,
const void *buffer)
{
return mmc_byte_io(ops, partition_name, offset_from_partition,
num_bytes, (void *)buffer, NULL, IO_WRITE);
}
/**
* validate_vmbeta_public_key() - checks if the given public key used to sign
* the vbmeta partition is trusted
*
* @ops: AvbOps, contains AVB ops handlers
* @public_key_data: public key for verifying vbmeta partition signature
* @public_key_length: length of public key
* @public_key_metadata:
* @public_key_metadata_length:
* @out_key_is_trusted:
*
* @return:
* AVB_IO_RESULT_OK, if partition was found and read operation succeed
*/
static AvbIOResult validate_vbmeta_public_key(AvbOps *ops,
const u8 *public_key_data,
size_t public_key_length,
const u8
*public_key_metadata,
size_t
public_key_metadata_length,
bool *out_key_is_trusted)
{
if (!public_key_length || !public_key_data || !out_key_is_trusted)
return AVB_IO_RESULT_ERROR_IO;
*out_key_is_trusted = false;
if (public_key_length != sizeof(avb_root_pub))
return AVB_IO_RESULT_ERROR_IO;
if (memcmp(avb_root_pub, public_key_data, public_key_length) == 0)
*out_key_is_trusted = true;
return AVB_IO_RESULT_OK;
}
#ifdef CONFIG_OPTEE_TA_AVB
static int get_open_session(struct AvbOpsData *ops_data)
{
struct udevice *tee = NULL;
while (!ops_data->tee) {
const struct tee_optee_ta_uuid uuid = TA_AVB_UUID;
struct tee_open_session_arg arg;
int rc;
tee = tee_find_device(tee, NULL, NULL, NULL);
if (!tee)
return -ENODEV;
memset(&arg, 0, sizeof(arg));
tee_optee_ta_uuid_to_octets(arg.uuid, &uuid);
rc = tee_open_session(tee, &arg, 0, NULL);
if (!rc) {
ops_data->tee = tee;
ops_data->session = arg.session;
}
}
return 0;
}
static AvbIOResult invoke_func(struct AvbOpsData *ops_data, u32 func,
ulong num_param, struct tee_param *param)
{
struct tee_invoke_arg arg;
if (get_open_session(ops_data))
return AVB_IO_RESULT_ERROR_IO;
memset(&arg, 0, sizeof(arg));
arg.func = func;
arg.session = ops_data->session;
if (tee_invoke_func(ops_data->tee, &arg, num_param, param))
return AVB_IO_RESULT_ERROR_IO;
switch (arg.ret) {
case TEE_SUCCESS:
return AVB_IO_RESULT_OK;
case TEE_ERROR_OUT_OF_MEMORY:
return AVB_IO_RESULT_ERROR_OOM;
case TEE_ERROR_STORAGE_NO_SPACE:
return AVB_IO_RESULT_ERROR_INSUFFICIENT_SPACE;
case TEE_ERROR_ITEM_NOT_FOUND:
return AVB_IO_RESULT_ERROR_NO_SUCH_VALUE;
case TEE_ERROR_TARGET_DEAD:
/*
* The TA has paniced, close the session to reload the TA
* for the next request.
*/
tee_close_session(ops_data->tee, ops_data->session);
ops_data->tee = NULL;
return AVB_IO_RESULT_ERROR_IO;
default:
return AVB_IO_RESULT_ERROR_IO;
}
}
#endif
/**
* read_rollback_index() - gets the rollback index corresponding to the
* location of given by @out_rollback_index.
*
* @ops: contains AvbOps handlers
* @rollback_index_slot:
* @out_rollback_index: used to write a retrieved rollback index.
*
* @return
* AVB_IO_RESULT_OK, if the roolback index was retrieved
*/
static AvbIOResult read_rollback_index(AvbOps *ops,
size_t rollback_index_slot,
u64 *out_rollback_index)
{
#ifndef CONFIG_OPTEE_TA_AVB
/* For now we always return 0 as the stored rollback index. */
printf("%s not supported yet\n", __func__);
if (out_rollback_index)
*out_rollback_index = 0;
return AVB_IO_RESULT_OK;
#else
AvbIOResult rc;
struct tee_param param[2];
if (rollback_index_slot >= TA_AVB_MAX_ROLLBACK_LOCATIONS)
return AVB_IO_RESULT_ERROR_NO_SUCH_VALUE;
memset(param, 0, sizeof(param));
param[0].attr = TEE_PARAM_ATTR_TYPE_VALUE_INPUT;
param[0].u.value.a = rollback_index_slot;
param[1].attr = TEE_PARAM_ATTR_TYPE_VALUE_OUTPUT;
rc = invoke_func(ops->user_data, TA_AVB_CMD_READ_ROLLBACK_INDEX,
ARRAY_SIZE(param), param);
if (rc)
return rc;
*out_rollback_index = (u64)param[1].u.value.a << 32 |
(u32)param[1].u.value.b;
return AVB_IO_RESULT_OK;
#endif
}
/**
* write_rollback_index() - sets the rollback index corresponding to the
* location of given by @out_rollback_index.
*
* @ops: contains AvbOps handlers
* @rollback_index_slot:
* @rollback_index: rollback index to write.
*
* @return
* AVB_IO_RESULT_OK, if the roolback index was retrieved
*/
static AvbIOResult write_rollback_index(AvbOps *ops,
size_t rollback_index_slot,
u64 rollback_index)
{
#ifndef CONFIG_OPTEE_TA_AVB
/* For now this is a no-op. */
printf("%s not supported yet\n", __func__);
return AVB_IO_RESULT_OK;
#else
struct tee_param param[2];
if (rollback_index_slot >= TA_AVB_MAX_ROLLBACK_LOCATIONS)
return AVB_IO_RESULT_ERROR_NO_SUCH_VALUE;
memset(param, 0, sizeof(param));
param[0].attr = TEE_PARAM_ATTR_TYPE_VALUE_INPUT;
param[0].u.value.a = rollback_index_slot;
param[1].attr = TEE_PARAM_ATTR_TYPE_VALUE_INPUT;
param[1].u.value.a = (u32)(rollback_index >> 32);
param[1].u.value.b = (u32)rollback_index;
return invoke_func(ops->user_data, TA_AVB_CMD_WRITE_ROLLBACK_INDEX,
ARRAY_SIZE(param), param);
#endif
}
/**
* read_is_device_unlocked() - gets whether the device is unlocked
*
* @ops: contains AVB ops handlers
* @out_is_unlocked: device unlock state is stored here, true if unlocked,
* false otherwise
*
* @return:
* AVB_IO_RESULT_OK: state is retrieved successfully
* AVB_IO_RESULT_ERROR_IO: an error occurred
*/
static AvbIOResult read_is_device_unlocked(AvbOps *ops, bool *out_is_unlocked)
{
#ifndef CONFIG_OPTEE_TA_AVB
/* For now we always return that the device is unlocked. */
printf("%s not supported yet\n", __func__);
*out_is_unlocked = true;
return AVB_IO_RESULT_OK;
#else
AvbIOResult rc;
struct tee_param param = { .attr = TEE_PARAM_ATTR_TYPE_VALUE_OUTPUT };
rc = invoke_func(ops->user_data, TA_AVB_CMD_READ_LOCK_STATE, 1, &param);
if (rc)
return rc;
*out_is_unlocked = !param.u.value.a;
return AVB_IO_RESULT_OK;
#endif
}
/**
* get_unique_guid_for_partition() - gets the GUID for a partition identified
* by a string name
*
* @ops: contains AVB ops handlers
* @partition: partition name (NUL-terminated UTF-8 string)
* @guid_buf: buf, used to copy in GUID string. Example of value:
* 527c1c6d-6361-4593-8842-3c78fcd39219
* @guid_buf_size: @guid_buf buffer size
*
* @return:
* AVB_IO_RESULT_OK, on success (GUID found)
* AVB_IO_RESULT_ERROR_IO, if incorrect buffer size (@guid_buf_size) was
* provided
* AVB_IO_RESULT_ERROR_NO_SUCH_PARTITION, if partition was not found
*/
static AvbIOResult get_unique_guid_for_partition(AvbOps *ops,
const char *partition,
char *guid_buf,
size_t guid_buf_size)
{
struct mmc_part *part;
size_t uuid_size;
part = get_partition(ops, partition);
if (!part)
return AVB_IO_RESULT_ERROR_NO_SUCH_PARTITION;
uuid_size = sizeof(part->info.uuid);
if (uuid_size > guid_buf_size)
return AVB_IO_RESULT_ERROR_IO;
memcpy(guid_buf, part->info.uuid, uuid_size);
guid_buf[uuid_size - 1] = 0;
return AVB_IO_RESULT_OK;
}
/**
* get_size_of_partition() - gets the size of a partition identified
* by a string name
*
* @ops: contains AVB ops handlers
* @partition: partition name (NUL-terminated UTF-8 string)
* @out_size_num_bytes: returns the value of a partition size
*
* @return:
* AVB_IO_RESULT_OK, on success (GUID found)
* AVB_IO_RESULT_ERROR_INSUFFICIENT_SPACE, out_size_num_bytes is NULL
* AVB_IO_RESULT_ERROR_NO_SUCH_PARTITION, if partition was not found
*/
static AvbIOResult get_size_of_partition(AvbOps *ops,
const char *partition,
u64 *out_size_num_bytes)
{
struct mmc_part *part;
if (!out_size_num_bytes)
return AVB_IO_RESULT_ERROR_INSUFFICIENT_SPACE;
part = get_partition(ops, partition);
if (!part)
return AVB_IO_RESULT_ERROR_NO_SUCH_PARTITION;
*out_size_num_bytes = part->info.blksz * part->info.size;
return AVB_IO_RESULT_OK;
}
#ifdef CONFIG_OPTEE_TA_AVB
static AvbIOResult read_persistent_value(AvbOps *ops,
const char *name,
size_t buffer_size,
u8 *out_buffer,
size_t *out_num_bytes_read)
{
AvbIOResult rc;
struct tee_shm *shm_name;
struct tee_shm *shm_buf;
struct tee_param param[2];
struct udevice *tee;
size_t name_size = strlen(name) + 1;
if (get_open_session(ops->user_data))
return AVB_IO_RESULT_ERROR_IO;
tee = ((struct AvbOpsData *)ops->user_data)->tee;
rc = tee_shm_alloc(tee, name_size,
TEE_SHM_ALLOC, &shm_name);
if (rc)
return AVB_IO_RESULT_ERROR_OOM;
rc = tee_shm_alloc(tee, buffer_size,
TEE_SHM_ALLOC, &shm_buf);
if (rc) {
rc = AVB_IO_RESULT_ERROR_OOM;
goto free_name;
}
memcpy(shm_name->addr, name, name_size);
memset(param, 0, sizeof(param));
param[0].attr = TEE_PARAM_ATTR_TYPE_MEMREF_INPUT;
param[0].u.memref.shm = shm_name;
param[0].u.memref.size = name_size;
param[1].attr = TEE_PARAM_ATTR_TYPE_MEMREF_INOUT;
param[1].u.memref.shm = shm_buf;
param[1].u.memref.size = buffer_size;
rc = invoke_func(ops->user_data, TA_AVB_CMD_READ_PERSIST_VALUE,
2, param);
if (rc)
goto out;
if (param[1].u.memref.size > buffer_size) {
rc = AVB_IO_RESULT_ERROR_NO_SUCH_VALUE;
goto out;
}
*out_num_bytes_read = param[1].u.memref.size;
memcpy(out_buffer, shm_buf->addr, *out_num_bytes_read);
out:
tee_shm_free(shm_buf);
free_name:
tee_shm_free(shm_name);
return rc;
}
static AvbIOResult write_persistent_value(AvbOps *ops,
const char *name,
size_t value_size,
const u8 *value)
{
AvbIOResult rc;
struct tee_shm *shm_name;
struct tee_shm *shm_buf;
struct tee_param param[2];
struct udevice *tee;
size_t name_size = strlen(name) + 1;
if (get_open_session(ops->user_data))
return AVB_IO_RESULT_ERROR_IO;
tee = ((struct AvbOpsData *)ops->user_data)->tee;
if (!value_size)
return AVB_IO_RESULT_ERROR_NO_SUCH_VALUE;
rc = tee_shm_alloc(tee, name_size,
TEE_SHM_ALLOC, &shm_name);
if (rc)
return AVB_IO_RESULT_ERROR_OOM;
rc = tee_shm_alloc(tee, value_size,
TEE_SHM_ALLOC, &shm_buf);
if (rc) {
rc = AVB_IO_RESULT_ERROR_OOM;
goto free_name;
}
memcpy(shm_name->addr, name, name_size);
memcpy(shm_buf->addr, value, value_size);
memset(param, 0, sizeof(param));
param[0].attr = TEE_PARAM_ATTR_TYPE_MEMREF_INPUT;
param[0].u.memref.shm = shm_name;
param[0].u.memref.size = name_size;
param[1].attr = TEE_PARAM_ATTR_TYPE_MEMREF_INPUT;
param[1].u.memref.shm = shm_buf;
param[1].u.memref.size = value_size;
rc = invoke_func(ops->user_data, TA_AVB_CMD_WRITE_PERSIST_VALUE,
2, param);
if (rc)
goto out;
out:
tee_shm_free(shm_buf);
free_name:
tee_shm_free(shm_name);
return rc;
}
#endif
/**
* ============================================================================
* AVB2.0 AvbOps alloc/initialisation/free
* ============================================================================
*/
AvbOps *avb_ops_alloc(int boot_device)
{
struct AvbOpsData *ops_data;
ops_data = avb_calloc(sizeof(struct AvbOpsData));
if (!ops_data)
return NULL;
ops_data->ops.user_data = ops_data;
ops_data->ops.read_from_partition = read_from_partition;
ops_data->ops.write_to_partition = write_to_partition;
ops_data->ops.validate_vbmeta_public_key = validate_vbmeta_public_key;
ops_data->ops.read_rollback_index = read_rollback_index;
ops_data->ops.write_rollback_index = write_rollback_index;
ops_data->ops.read_is_device_unlocked = read_is_device_unlocked;
ops_data->ops.get_unique_guid_for_partition =
get_unique_guid_for_partition;
#ifdef CONFIG_OPTEE_TA_AVB
ops_data->ops.write_persistent_value = write_persistent_value;
ops_data->ops.read_persistent_value = read_persistent_value;
#endif
ops_data->ops.get_size_of_partition = get_size_of_partition;
ops_data->mmc_dev = boot_device;
return &ops_data->ops;
}
void avb_ops_free(AvbOps *ops)
{
struct AvbOpsData *ops_data;
if (!ops)
return;
ops_data = ops->user_data;
if (ops_data) {
#ifdef CONFIG_OPTEE_TA_AVB
if (ops_data->tee)
tee_close_session(ops_data->tee, ops_data->session);
#endif
avb_free(ops_data);
}
}
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