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3f0d680745
Avoid using a typedef here which is unnecessary. Add an 'env_' prefix to both the enum and its members to make it clear that these are related to the environment. Add an ENV prefix to these two flags so that it is clear what they relate to. Also move them to env.h since they are part of the public API. Use an enum rather than a #define to tie them together. Signed-off-by: Simon Glass <sjg@chromium.org>
391 lines
9.2 KiB
C
391 lines
9.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2018 Linaro Limited
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*/
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#include <common.h>
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#include <dm.h>
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#include <sandboxtee.h>
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#include <tee.h>
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#include <tee/optee_ta_avb.h>
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/*
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* The sandbox tee driver tries to emulate a generic Trusted Exectution
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* Environment (TEE) with the Trusted Application (TA) OPTEE_TA_AVB
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* available.
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*/
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static const u32 pstorage_max = 16;
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/**
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* struct ta_entry - TA entries
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* @uuid: UUID of an emulated TA
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* @open_session Called when a session is openened to the TA
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* @invoke_func Called when a function in the TA is to be invoked
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*
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* This struct is used to register TAs in this sandbox emulation of a TEE.
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*/
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struct ta_entry {
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struct tee_optee_ta_uuid uuid;
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u32 (*open_session)(struct udevice *dev, uint num_params,
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struct tee_param *params);
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u32 (*invoke_func)(struct udevice *dev,
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u32 func, uint num_params,
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struct tee_param *params);
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};
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#ifdef CONFIG_OPTEE_TA_AVB
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static u32 get_attr(uint n, uint num_params, struct tee_param *params)
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{
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if (n >= num_params)
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return TEE_PARAM_ATTR_TYPE_NONE;
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return params[n].attr;
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}
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static u32 check_params(u8 p0, u8 p1, u8 p2, u8 p3, uint num_params,
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struct tee_param *params)
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{
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u8 p[] = { p0, p1, p2, p3};
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uint n;
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for (n = 0; n < ARRAY_SIZE(p); n++)
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if (p[n] != get_attr(n, num_params, params))
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goto bad_params;
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for (; n < num_params; n++)
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if (get_attr(n, num_params, params))
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goto bad_params;
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return TEE_SUCCESS;
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bad_params:
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printf("Bad param attrs\n");
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return TEE_ERROR_BAD_PARAMETERS;
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}
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static u32 ta_avb_open_session(struct udevice *dev, uint num_params,
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struct tee_param *params)
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{
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/*
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* We don't expect additional parameters when opening a session to
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* this TA.
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*/
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return check_params(TEE_PARAM_ATTR_TYPE_NONE, TEE_PARAM_ATTR_TYPE_NONE,
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TEE_PARAM_ATTR_TYPE_NONE, TEE_PARAM_ATTR_TYPE_NONE,
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num_params, params);
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}
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static u32 ta_avb_invoke_func(struct udevice *dev, u32 func, uint num_params,
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struct tee_param *params)
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{
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struct sandbox_tee_state *state = dev_get_priv(dev);
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struct env_entry e, *ep;
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char *name;
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u32 res;
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uint slot;
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u64 val;
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char *value;
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u32 value_sz;
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switch (func) {
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case TA_AVB_CMD_READ_ROLLBACK_INDEX:
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res = check_params(TEE_PARAM_ATTR_TYPE_VALUE_INPUT,
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TEE_PARAM_ATTR_TYPE_VALUE_OUTPUT,
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TEE_PARAM_ATTR_TYPE_NONE,
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TEE_PARAM_ATTR_TYPE_NONE,
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num_params, params);
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if (res)
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return res;
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slot = params[0].u.value.a;
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if (slot >= ARRAY_SIZE(state->ta_avb_rollback_indexes)) {
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printf("Rollback index slot out of bounds %u\n", slot);
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return TEE_ERROR_BAD_PARAMETERS;
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}
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val = state->ta_avb_rollback_indexes[slot];
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params[1].u.value.a = val >> 32;
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params[1].u.value.b = val;
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return TEE_SUCCESS;
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case TA_AVB_CMD_WRITE_ROLLBACK_INDEX:
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res = check_params(TEE_PARAM_ATTR_TYPE_VALUE_INPUT,
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TEE_PARAM_ATTR_TYPE_VALUE_INPUT,
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TEE_PARAM_ATTR_TYPE_NONE,
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TEE_PARAM_ATTR_TYPE_NONE,
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num_params, params);
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if (res)
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return res;
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slot = params[0].u.value.a;
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if (slot >= ARRAY_SIZE(state->ta_avb_rollback_indexes)) {
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printf("Rollback index slot out of bounds %u\n", slot);
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return TEE_ERROR_BAD_PARAMETERS;
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}
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val = (u64)params[1].u.value.a << 32 | params[1].u.value.b;
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if (val < state->ta_avb_rollback_indexes[slot])
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return TEE_ERROR_SECURITY;
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state->ta_avb_rollback_indexes[slot] = val;
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return TEE_SUCCESS;
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case TA_AVB_CMD_READ_LOCK_STATE:
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res = check_params(TEE_PARAM_ATTR_TYPE_VALUE_OUTPUT,
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TEE_PARAM_ATTR_TYPE_NONE,
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TEE_PARAM_ATTR_TYPE_NONE,
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TEE_PARAM_ATTR_TYPE_NONE,
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num_params, params);
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if (res)
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return res;
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params[0].u.value.a = state->ta_avb_lock_state;
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return TEE_SUCCESS;
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case TA_AVB_CMD_WRITE_LOCK_STATE:
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res = check_params(TEE_PARAM_ATTR_TYPE_VALUE_INPUT,
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TEE_PARAM_ATTR_TYPE_NONE,
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TEE_PARAM_ATTR_TYPE_NONE,
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TEE_PARAM_ATTR_TYPE_NONE,
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num_params, params);
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if (res)
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return res;
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if (state->ta_avb_lock_state != params[0].u.value.a) {
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state->ta_avb_lock_state = params[0].u.value.a;
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memset(state->ta_avb_rollback_indexes, 0,
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sizeof(state->ta_avb_rollback_indexes));
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}
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return TEE_SUCCESS;
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case TA_AVB_CMD_READ_PERSIST_VALUE:
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res = check_params(TEE_PARAM_ATTR_TYPE_MEMREF_INPUT,
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TEE_PARAM_ATTR_TYPE_MEMREF_INOUT,
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TEE_PARAM_ATTR_TYPE_NONE,
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TEE_PARAM_ATTR_TYPE_NONE,
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num_params, params);
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if (res)
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return res;
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name = params[0].u.memref.shm->addr;
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value = params[1].u.memref.shm->addr;
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value_sz = params[1].u.memref.size;
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e.key = name;
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e.data = NULL;
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hsearch_r(e, ENV_FIND, &ep, &state->pstorage_htab, 0);
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if (!ep)
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return TEE_ERROR_ITEM_NOT_FOUND;
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value_sz = strlen(ep->data) + 1;
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memcpy(value, ep->data, value_sz);
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return TEE_SUCCESS;
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case TA_AVB_CMD_WRITE_PERSIST_VALUE:
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res = check_params(TEE_PARAM_ATTR_TYPE_MEMREF_INPUT,
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TEE_PARAM_ATTR_TYPE_MEMREF_INPUT,
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TEE_PARAM_ATTR_TYPE_NONE,
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TEE_PARAM_ATTR_TYPE_NONE,
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num_params, params);
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if (res)
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return res;
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name = params[0].u.memref.shm->addr;
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value = params[1].u.memref.shm->addr;
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value_sz = params[1].u.memref.size;
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e.key = name;
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e.data = NULL;
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hsearch_r(e, ENV_FIND, &ep, &state->pstorage_htab, 0);
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if (ep)
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hdelete_r(e.key, &state->pstorage_htab, 0);
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e.key = name;
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e.data = value;
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hsearch_r(e, ENV_ENTER, &ep, &state->pstorage_htab, 0);
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if (!ep)
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return TEE_ERROR_OUT_OF_MEMORY;
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return TEE_SUCCESS;
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default:
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return TEE_ERROR_NOT_SUPPORTED;
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}
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}
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#endif /*OPTEE_TA_AVB*/
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static const struct ta_entry ta_entries[] = {
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#ifdef CONFIG_OPTEE_TA_AVB
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{ .uuid = TA_AVB_UUID,
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.open_session = ta_avb_open_session,
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.invoke_func = ta_avb_invoke_func,
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},
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#endif
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};
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static void sandbox_tee_get_version(struct udevice *dev,
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struct tee_version_data *vers)
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{
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struct tee_version_data v = {
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.gen_caps = TEE_GEN_CAP_GP | TEE_GEN_CAP_REG_MEM,
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};
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*vers = v;
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}
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static int sandbox_tee_close_session(struct udevice *dev, u32 session)
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{
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struct sandbox_tee_state *state = dev_get_priv(dev);
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if (!state->ta || state->session != session)
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return -EINVAL;
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state->session = 0;
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state->ta = NULL;
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return 0;
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}
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static const struct ta_entry *find_ta_entry(u8 uuid[TEE_UUID_LEN])
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{
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struct tee_optee_ta_uuid u;
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uint n;
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tee_optee_ta_uuid_from_octets(&u, uuid);
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for (n = 0; n < ARRAY_SIZE(ta_entries); n++)
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if (!memcmp(&u, &ta_entries[n].uuid, sizeof(u)))
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return ta_entries + n;
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return NULL;
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}
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static int sandbox_tee_open_session(struct udevice *dev,
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struct tee_open_session_arg *arg,
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uint num_params, struct tee_param *params)
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{
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struct sandbox_tee_state *state = dev_get_priv(dev);
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const struct ta_entry *ta;
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if (state->ta) {
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printf("A session is already open\n");
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return -EBUSY;
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}
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ta = find_ta_entry(arg->uuid);
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if (!ta) {
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printf("Cannot find TA\n");
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arg->ret = TEE_ERROR_ITEM_NOT_FOUND;
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arg->ret_origin = TEE_ORIGIN_TEE;
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return 0;
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}
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arg->ret = ta->open_session(dev, num_params, params);
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arg->ret_origin = TEE_ORIGIN_TRUSTED_APP;
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if (!arg->ret) {
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state->ta = (void *)ta;
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state->session = 1;
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arg->session = state->session;
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} else {
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printf("Cannot open session, TA returns error\n");
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}
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return 0;
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}
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static int sandbox_tee_invoke_func(struct udevice *dev,
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struct tee_invoke_arg *arg,
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uint num_params, struct tee_param *params)
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{
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struct sandbox_tee_state *state = dev_get_priv(dev);
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struct ta_entry *ta = state->ta;
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if (!arg->session) {
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printf("Missing session\n");
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return -EINVAL;
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}
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if (!ta) {
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printf("TA session not available\n");
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return -EINVAL;
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}
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if (arg->session != state->session) {
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printf("Session mismatch\n");
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return -EINVAL;
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}
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arg->ret = ta->invoke_func(dev, arg->func, num_params, params);
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arg->ret_origin = TEE_ORIGIN_TRUSTED_APP;
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return 0;
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}
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static int sandbox_tee_shm_register(struct udevice *dev, struct tee_shm *shm)
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{
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struct sandbox_tee_state *state = dev_get_priv(dev);
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state->num_shms++;
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return 0;
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}
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static int sandbox_tee_shm_unregister(struct udevice *dev, struct tee_shm *shm)
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{
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struct sandbox_tee_state *state = dev_get_priv(dev);
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state->num_shms--;
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return 0;
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}
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static int sandbox_tee_remove(struct udevice *dev)
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{
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struct sandbox_tee_state *state = dev_get_priv(dev);
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hdestroy_r(&state->pstorage_htab);
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return 0;
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}
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static int sandbox_tee_probe(struct udevice *dev)
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{
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struct sandbox_tee_state *state = dev_get_priv(dev);
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/*
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* With this hastable we emulate persistent storage,
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* which should contain persistent values
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* between different sessions/command invocations.
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*/
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if (!hcreate_r(pstorage_max, &state->pstorage_htab))
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return TEE_ERROR_OUT_OF_MEMORY;
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return 0;
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}
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static const struct tee_driver_ops sandbox_tee_ops = {
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.get_version = sandbox_tee_get_version,
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.open_session = sandbox_tee_open_session,
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.close_session = sandbox_tee_close_session,
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.invoke_func = sandbox_tee_invoke_func,
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.shm_register = sandbox_tee_shm_register,
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.shm_unregister = sandbox_tee_shm_unregister,
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};
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static const struct udevice_id sandbox_tee_match[] = {
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{ .compatible = "sandbox,tee" },
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{},
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};
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U_BOOT_DRIVER(sandbox_tee) = {
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.name = "sandbox_tee",
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.id = UCLASS_TEE,
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.of_match = sandbox_tee_match,
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.ops = &sandbox_tee_ops,
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.priv_auto_alloc_size = sizeof(struct sandbox_tee_state),
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.probe = sandbox_tee_probe,
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.remove = sandbox_tee_remove,
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};
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