[U-Boot] [PATCH v5 1/1] avb: add support for named persistent values
Sam Protsenko
semen.protsenko at linaro.org
Tue Mar 12 13:00:06 UTC 2019
Reviewed-by: Sam Protsenko <semen.protsenko at linaro.org>
On Thu, Feb 14, 2019 at 2:37 PM Igor Opaniuk <igor.opaniuk at linaro.org> wrote:
>
> AVB 2.0 spec. revision 1.1 introduces support for named persistent values
> that must be tamper evident and allows AVB to store arbitrary key-value
> pairs [1].
>
> Introduce implementation of two additional AVB operations
> read_persistent_value()/write_persistent_value() for retrieving/storing
> named persistent values.
>
> Correspondent pull request in the OP-TEE OS project repo [2].
>
> [1]: https://android.googlesource.com/platform/external/avb/+/android-9.0.0_r22
> [2]: https://github.com/OP-TEE/optee_os/pull/2699
>
> Reviewed-by: Simon Glass <sjg at chromium.org>
> Signed-off-by: Igor Opaniuk <igor.opaniuk at linaro.org>
> ---
>
> v5:
> - fix failing test on sandbox_flattree target
> - keep all defined globally variables in a driver-private data struct, which
> permits to probe multiple tee sandbox devices
>
> v4:
> - extend tee sandbox tee driver to support persistent values
> - fix/re-test avb_persistent test on sandbox configuration
>
> v3:
> - fix possible mem lick in avb_read_persistent/avb_write_persistent
> - add additional sanity checks
> - cover avb read_pvalue/write_pvalue commands with python tests
>
> v2:
> - fix output format for avb read_pvalue/write_pvalue commands
> - fix issue with named value buffer size
>
> cmd/avb.c | 78 ++++++++++++++++++++++++++++
> common/avb_verify.c | 125 +++++++++++++++++++++++++++++++++++++++++++++
> drivers/tee/sandbox.c | 121 ++++++++++++++++++++++++++++++++++++-------
> include/sandboxtee.h | 15 ++++--
> include/tee.h | 2 +
> include/tee/optee_ta_avb.h | 16 ++++++
> test/py/tests/test_avb.py | 16 ++++++
> 7 files changed, 351 insertions(+), 22 deletions(-)
>
> diff --git a/cmd/avb.c b/cmd/avb.c
> index ff00be4..c5af4a2 100644
> --- a/cmd/avb.c
> +++ b/cmd/avb.c
> @@ -340,6 +340,76 @@ int do_avb_is_unlocked(cmd_tbl_t *cmdtp, int flag,
> return CMD_RET_FAILURE;
> }
>
> +int do_avb_read_pvalue(cmd_tbl_t *cmdtp, int flag, int argc,
> + char * const argv[])
> +{
> + const char *name;
> + size_t bytes;
> + size_t bytes_read;
> + void *buffer;
> + char *endp;
> +
> + if (!avb_ops) {
> + printf("AVB 2.0 is not initialized, run 'avb init' first\n");
> + return CMD_RET_FAILURE;
> + }
> +
> + if (argc != 3)
> + return CMD_RET_USAGE;
> +
> + name = argv[1];
> + bytes = simple_strtoul(argv[2], &endp, 10);
> + if (*endp && *endp != '\n')
> + return CMD_RET_USAGE;
> +
> + buffer = malloc(bytes);
> + if (!buffer)
> + return CMD_RET_FAILURE;
> +
> + if (avb_ops->read_persistent_value(avb_ops, name, bytes, buffer,
> + &bytes_read) == AVB_IO_RESULT_OK) {
> + printf("Read %ld bytes, value = %s\n", bytes_read,
> + (char *)buffer);
> + free(buffer);
> + return CMD_RET_SUCCESS;
> + }
> +
> + printf("Failed to read persistent value\n");
> +
> + free(buffer);
> +
> + return CMD_RET_FAILURE;
> +}
> +
> +int do_avb_write_pvalue(cmd_tbl_t *cmdtp, int flag, int argc,
> + char * const argv[])
> +{
> + const char *name;
> + const char *value;
> +
> + if (!avb_ops) {
> + printf("AVB 2.0 is not initialized, run 'avb init' first\n");
> + return CMD_RET_FAILURE;
> + }
> +
> + if (argc != 3)
> + return CMD_RET_USAGE;
> +
> + name = argv[1];
> + value = argv[2];
> +
> + if (avb_ops->write_persistent_value(avb_ops, name, strlen(value) + 1,
> + (const uint8_t *)value) ==
> + AVB_IO_RESULT_OK) {
> + printf("Wrote %ld bytes\n", strlen(value) + 1);
> + return CMD_RET_SUCCESS;
> + }
> +
> + printf("Failed to write persistent value\n");
> +
> + return CMD_RET_FAILURE;
> +}
> +
> static cmd_tbl_t cmd_avb[] = {
> U_BOOT_CMD_MKENT(init, 2, 0, do_avb_init, "", ""),
> U_BOOT_CMD_MKENT(read_rb, 2, 0, do_avb_read_rb, "", ""),
> @@ -350,6 +420,10 @@ static cmd_tbl_t cmd_avb[] = {
> U_BOOT_CMD_MKENT(read_part_hex, 4, 0, do_avb_read_part_hex, "", ""),
> U_BOOT_CMD_MKENT(write_part, 5, 0, do_avb_write_part, "", ""),
> U_BOOT_CMD_MKENT(verify, 1, 0, do_avb_verify_part, "", ""),
> +#ifdef CONFIG_OPTEE_TA_AVB
> + U_BOOT_CMD_MKENT(read_pvalue, 3, 0, do_avb_read_pvalue, "", ""),
> + U_BOOT_CMD_MKENT(write_pvalue, 3, 0, do_avb_write_pvalue, "", ""),
> +#endif
> };
>
> static int do_avb(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
> @@ -384,6 +458,10 @@ U_BOOT_CMD(
> " partition <partname> and print to stdout\n"
> "avb write_part <partname> <offset> <num> <addr> - write <num> bytes to\n"
> " <partname> by <offset> using data from <addr>\n"
> +#ifdef CONFIG_OPTEE_TA_AVB
> + "avb read_pvalue <name> <bytes> - read a persistent value <name>\n"
> + "avb write_pvalue <name> <value> - write a persistent value <name>\n"
> +#endif
> "avb verify - run verification process using hash data\n"
> " from vbmeta structure\n"
> );
> diff --git a/common/avb_verify.c b/common/avb_verify.c
> index a8c5a3e..32034d9 100644
> --- a/common/avb_verify.c
> +++ b/common/avb_verify.c
> @@ -647,6 +647,10 @@ static AvbIOResult invoke_func(struct AvbOpsData *ops_data, u32 func,
> 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
> @@ -847,6 +851,123 @@ static AvbIOResult get_size_of_partition(AvbOps *ops,
> return AVB_IO_RESULT_OK;
> }
>
> +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;
> +}
> /**
> * ============================================================================
> * AVB2.0 AvbOps alloc/initialisation/free
> @@ -870,6 +991,10 @@ AvbOps *avb_ops_alloc(int boot_device)
> 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;
>
> diff --git a/drivers/tee/sandbox.c b/drivers/tee/sandbox.c
> index ccddb03..a136bc9 100644
> --- a/drivers/tee/sandbox.c
> +++ b/drivers/tee/sandbox.c
> @@ -14,6 +14,7 @@
> * available.
> */
>
> +static const u32 pstorage_max = 16;
> /**
> * struct ta_entry - TA entries
> * @uuid: UUID of an emulated TA
> @@ -24,8 +25,11 @@
> */
> struct ta_entry {
> struct tee_optee_ta_uuid uuid;
> - u32 (*open_session)(uint num_params, struct tee_param *params);
> - u32 (*invoke_func)(u32 func, uint num_params, struct tee_param *params);
> + u32 (*open_session)(struct udevice *dev, uint num_params,
> + struct tee_param *params);
> + u32 (*invoke_func)(struct udevice *dev,
> + u32 func, uint num_params,
> + struct tee_param *params);
> };
>
> #ifdef CONFIG_OPTEE_TA_AVB
> @@ -59,10 +63,8 @@ bad_params:
> return TEE_ERROR_BAD_PARAMETERS;
> }
>
> -static u64 ta_avb_rollback_indexes[TA_AVB_MAX_ROLLBACK_LOCATIONS];
> -static u32 ta_avb_lock_state;
> -
> -static u32 ta_avb_open_session(uint num_params, struct tee_param *params)
> +static u32 ta_avb_open_session(struct udevice *dev, uint num_params,
> + struct tee_param *params)
> {
> /*
> * We don't expect additional parameters when opening a session to
> @@ -73,12 +75,17 @@ static u32 ta_avb_open_session(uint num_params, struct tee_param *params)
> num_params, params);
> }
>
> -static u32 ta_avb_invoke_func(u32 func, uint num_params,
> +static u32 ta_avb_invoke_func(struct udevice *dev, u32 func, uint num_params,
> struct tee_param *params)
> {
> + struct sandbox_tee_state *state = dev_get_priv(dev);
> + ENTRY e, *ep;
> + char *name;
> u32 res;
> uint slot;
> u64 val;
> + char *value;
> + u32 value_sz;
>
> switch (func) {
> case TA_AVB_CMD_READ_ROLLBACK_INDEX:
> @@ -91,12 +98,12 @@ static u32 ta_avb_invoke_func(u32 func, uint num_params,
> return res;
>
> slot = params[0].u.value.a;
> - if (slot >= ARRAY_SIZE(ta_avb_rollback_indexes)) {
> + if (slot >= ARRAY_SIZE(state->ta_avb_rollback_indexes)) {
> printf("Rollback index slot out of bounds %u\n", slot);
> return TEE_ERROR_BAD_PARAMETERS;
> }
>
> - val = ta_avb_rollback_indexes[slot];
> + val = state->ta_avb_rollback_indexes[slot];
> params[1].u.value.a = val >> 32;
> params[1].u.value.b = val;
> return TEE_SUCCESS;
> @@ -111,16 +118,16 @@ static u32 ta_avb_invoke_func(u32 func, uint num_params,
> return res;
>
> slot = params[0].u.value.a;
> - if (slot >= ARRAY_SIZE(ta_avb_rollback_indexes)) {
> + if (slot >= ARRAY_SIZE(state->ta_avb_rollback_indexes)) {
> printf("Rollback index slot out of bounds %u\n", slot);
> return TEE_ERROR_BAD_PARAMETERS;
> }
>
> val = (u64)params[1].u.value.a << 32 | params[1].u.value.b;
> - if (val < ta_avb_rollback_indexes[slot])
> + if (val < state->ta_avb_rollback_indexes[slot])
> return TEE_ERROR_SECURITY;
>
> - ta_avb_rollback_indexes[slot] = val;
> + state->ta_avb_rollback_indexes[slot] = val;
> return TEE_SUCCESS;
>
> case TA_AVB_CMD_READ_LOCK_STATE:
> @@ -132,7 +139,7 @@ static u32 ta_avb_invoke_func(u32 func, uint num_params,
> if (res)
> return res;
>
> - params[0].u.value.a = ta_avb_lock_state;
> + params[0].u.value.a = state->ta_avb_lock_state;
> return TEE_SUCCESS;
>
> case TA_AVB_CMD_WRITE_LOCK_STATE:
> @@ -144,13 +151,64 @@ static u32 ta_avb_invoke_func(u32 func, uint num_params,
> if (res)
> return res;
>
> - if (ta_avb_lock_state != params[0].u.value.a) {
> - ta_avb_lock_state = params[0].u.value.a;
> - memset(ta_avb_rollback_indexes, 0,
> - sizeof(ta_avb_rollback_indexes));
> + if (state->ta_avb_lock_state != params[0].u.value.a) {
> + state->ta_avb_lock_state = params[0].u.value.a;
> + memset(state->ta_avb_rollback_indexes, 0,
> + sizeof(state->ta_avb_rollback_indexes));
> }
>
> return TEE_SUCCESS;
> + case TA_AVB_CMD_READ_PERSIST_VALUE:
> + res = check_params(TEE_PARAM_ATTR_TYPE_MEMREF_INPUT,
> + TEE_PARAM_ATTR_TYPE_MEMREF_INOUT,
> + TEE_PARAM_ATTR_TYPE_NONE,
> + TEE_PARAM_ATTR_TYPE_NONE,
> + num_params, params);
> + if (res)
> + return res;
> +
> + name = params[0].u.memref.shm->addr;
> +
> + value = params[1].u.memref.shm->addr;
> + value_sz = params[1].u.memref.size;
> +
> + e.key = name;
> + e.data = NULL;
> + hsearch_r(e, FIND, &ep, &state->pstorage_htab, 0);
> + if (!ep)
> + return TEE_ERROR_ITEM_NOT_FOUND;
> +
> + value_sz = strlen(ep->data);
> + memcpy(value, ep->data, value_sz);
> +
> + return TEE_SUCCESS;
> + case TA_AVB_CMD_WRITE_PERSIST_VALUE:
> + res = check_params(TEE_PARAM_ATTR_TYPE_MEMREF_INPUT,
> + TEE_PARAM_ATTR_TYPE_MEMREF_INPUT,
> + TEE_PARAM_ATTR_TYPE_NONE,
> + TEE_PARAM_ATTR_TYPE_NONE,
> + num_params, params);
> + if (res)
> + return res;
> +
> + name = params[0].u.memref.shm->addr;
> +
> + value = params[1].u.memref.shm->addr;
> + value_sz = params[1].u.memref.size;
> +
> + e.key = name;
> + e.data = NULL;
> + hsearch_r(e, FIND, &ep, &state->pstorage_htab, 0);
> + if (ep)
> + hdelete_r(e.key, &state->pstorage_htab, 0);
> +
> + e.key = name;
> + e.data = value;
> + hsearch_r(e, ENTER, &ep, &state->pstorage_htab, 0);
> + if (!ep)
> + return TEE_ERROR_OUT_OF_MEMORY;
> +
> + return TEE_SUCCESS;
>
> default:
> return TEE_ERROR_NOT_SUPPORTED;
> @@ -225,7 +283,7 @@ static int sandbox_tee_open_session(struct udevice *dev,
> return 0;
> }
>
> - arg->ret = ta->open_session(num_params, params);
> + arg->ret = ta->open_session(dev, num_params, params);
> arg->ret_origin = TEE_ORIGIN_TRUSTED_APP;
>
> if (!arg->ret) {
> @@ -261,7 +319,7 @@ static int sandbox_tee_invoke_func(struct udevice *dev,
> return -EINVAL;
> }
>
> - arg->ret = ta->invoke_func(arg->func, num_params, params);
> + arg->ret = ta->invoke_func(dev, arg->func, num_params, params);
> arg->ret_origin = TEE_ORIGIN_TRUSTED_APP;
>
> return 0;
> @@ -285,6 +343,29 @@ static int sandbox_tee_shm_unregister(struct udevice *dev, struct tee_shm *shm)
> return 0;
> }
>
> +static int sandbox_tee_remove(struct udevice *dev)
> +{
> + struct sandbox_tee_state *state = dev_get_priv(dev);
> +
> + hdestroy_r(&state->pstorage_htab);
> +
> + return 0;
> +}
> +
> +static int sandbox_tee_probe(struct udevice *dev)
> +{
> + struct sandbox_tee_state *state = dev_get_priv(dev);
> + /*
> + * With this hastable we emulate persistent storage,
> + * which should contain persistent values
> + * between different sessions/command invocations.
> + */
> + if (!hcreate_r(pstorage_max, &state->pstorage_htab))
> + return TEE_ERROR_OUT_OF_MEMORY;
> +
> + return 0;
> +}
> +
> static const struct tee_driver_ops sandbox_tee_ops = {
> .get_version = sandbox_tee_get_version,
> .open_session = sandbox_tee_open_session,
> @@ -305,4 +386,6 @@ U_BOOT_DRIVER(sandbox_tee) = {
> .of_match = sandbox_tee_match,
> .ops = &sandbox_tee_ops,
> .priv_auto_alloc_size = sizeof(struct sandbox_tee_state),
> + .probe = sandbox_tee_probe,
> + .remove = sandbox_tee_remove,
> };
> diff --git a/include/sandboxtee.h b/include/sandboxtee.h
> index 44f653d..419643a 100644
> --- a/include/sandboxtee.h
> +++ b/include/sandboxtee.h
> @@ -6,16 +6,25 @@
> #ifndef __SANDBOXTEE_H
> #define __SANDBOXTEE_H
>
> +#include <search.h>
> +#include <tee/optee_ta_avb.h>
> +
> /**
> * struct sandbox_tee_state - internal state of the sandbox TEE
> - * @session: current open session
> - * @num_shms: number of registered shared memory objects
> - * @ta: Trusted Application of current session
> + * @session: current open session
> + * @num_shms: number of registered shared memory objects
> + * @ta: Trusted Application of current session
> + * @ta_avb_rollback_indexes TA avb rollback indexes storage
> + * @ta_avb_lock_state TA avb lock state storage
> + * @pstorage_htab named persistent values storage
> */
> struct sandbox_tee_state {
> u32 session;
> int num_shms;
> void *ta;
> + u64 ta_avb_rollback_indexes[TA_AVB_MAX_ROLLBACK_LOCATIONS];
> + u32 ta_avb_lock_state;
> + struct hsearch_data pstorage_htab;
> };
>
> #endif /*__SANDBOXTEE_H*/
> diff --git a/include/tee.h b/include/tee.h
> index edd9f9b..02bcd9e 100644
> --- a/include/tee.h
> +++ b/include/tee.h
> @@ -43,7 +43,9 @@
> #define TEE_ERROR_COMMUNICATION 0xffff000e
> #define TEE_ERROR_SECURITY 0xffff000f
> #define TEE_ERROR_OUT_OF_MEMORY 0xffff000c
> +#define TEE_ERROR_OVERFLOW 0xffff300f
> #define TEE_ERROR_TARGET_DEAD 0xffff3024
> +#define TEE_ERROR_STORAGE_NO_SPACE 0xffff3041
>
> #define TEE_ORIGIN_COMMS 0x00000002
> #define TEE_ORIGIN_TEE 0x00000003
> diff --git a/include/tee/optee_ta_avb.h b/include/tee/optee_ta_avb.h
> index 074386a..949875a 100644
> --- a/include/tee/optee_ta_avb.h
> +++ b/include/tee/optee_ta_avb.h
> @@ -45,4 +45,20 @@
> */
> #define TA_AVB_CMD_WRITE_LOCK_STATE 3
>
> +/*
> + * Reads a persistent value corresponding to the given name.
> + *
> + * in params[0].u.memref: persistent value name
> + * out params[1].u.memref: read persistent value buffer
> + */
> +#define TA_AVB_CMD_READ_PERSIST_VALUE 4
> +
> +/*
> + * Writes a persistent value corresponding to the given name.
> + *
> + * in params[0].u.memref: persistent value name
> + * in params[1].u.memref: persistent value buffer to write
> + */
> +#define TA_AVB_CMD_WRITE_PERSIST_VALUE 5
> +
> #endif /* __TA_AVB_H */
> diff --git a/test/py/tests/test_avb.py b/test/py/tests/test_avb.py
> index e70a010..2bb75ed 100644
> --- a/test/py/tests/test_avb.py
> +++ b/test/py/tests/test_avb.py
> @@ -116,3 +116,19 @@ def test_avb_mmc_read(u_boot_console):
> response = u_boot_console.run_command('cmp 0x%x 0x%x 40' %
> (temp_addr, temp_addr2))
> assert response.find('64 word')
> +
> +
> + at pytest.mark.buildconfigspec('cmd_avb')
> + at pytest.mark.buildconfigspec('optee_ta_avb')
> +def test_avb_persistent_values(u_boot_console):
> + """Test reading/writing persistent storage to avb
> + """
> +
> + response = u_boot_console.run_command('avb init %s' % str(mmc_dev))
> + assert response == ''
> +
> + response = u_boot_console.run_command('avb write_pvalue test value_value')
> + assert response == 'Wrote 12 bytes'
> +
> + response = u_boot_console.run_command('avb read_pvalue test 12')
> + assert response == 'Read 12 bytes, value = value_value'
> --
> 2.7.4
>
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