avb: add support for named persistent values
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@chromium.org>
Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>
Signed-off-by: Igor Opaniuk <igor.opaniuk@gmail.com>
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 @@
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 @@
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 @@
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;