mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-10 15:14:43 +00:00
tee: add sandbox driver
Adds a sandbox tee driver which emulates a generic TEE with the OP-TEE AVB TA. Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org> Reviewed-by: Simon Glass <sjg@chromium.org> [trini: Fix printf warnings in ta_avb_invoke_func, slots is uint] Signed-off-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
parent
fe39e8e0ee
commit
eadf26f183
5 changed files with 347 additions and 3 deletions
|
@ -1,8 +1,8 @@
|
|||
# Generic Trusted Execution Environment Configuration
|
||||
config TEE
|
||||
bool "Trusted Execution Environment support"
|
||||
depends on ARM && (ARM64 || CPU_V7A)
|
||||
select ARM_SMCCC
|
||||
depends on (ARM && (ARM64 || CPU_V7A)) || SANDBOX
|
||||
select ARM_SMCCC if ARM
|
||||
help
|
||||
This implements a generic interface towards a Trusted Execution
|
||||
Environment (TEE). A TEE is a trusted OS running in some secure
|
||||
|
@ -14,6 +14,20 @@ if TEE
|
|||
|
||||
menu "TEE drivers"
|
||||
|
||||
config SANDBOX_TEE
|
||||
bool "Sandbox TEE emulator"
|
||||
depends on SANDBOX
|
||||
default y
|
||||
help
|
||||
This emulates a generic TEE needed for testing including the AVB
|
||||
TA. The emulation provides all callbacks of a regular TEE and
|
||||
supports session and shared memory management. The AVB TA is
|
||||
emulated with rollback indexes and device lock-state, the state
|
||||
of the TA is only kept in RAM and will be reset on each boot.
|
||||
The emulation only supports one open session at a time.
|
||||
Interaction from the U-Boot command line in possible via the
|
||||
"avb" commands.
|
||||
|
||||
source "drivers/tee/optee/Kconfig"
|
||||
|
||||
endmenu
|
||||
|
|
|
@ -1,4 +1,5 @@
|
|||
# SPDX-License-Identifier: GPL-2.0+
|
||||
|
||||
obj-y += tee-uclass.o
|
||||
obj-$(CONFIG_SANDBOX) += sandbox.o
|
||||
obj-$(CONFIG_OPTEE) += optee/
|
||||
|
|
|
@ -10,7 +10,7 @@ config OPTEE
|
|||
handle Remote Procedure Calls (RPC) from OP-TEE needed to
|
||||
execute a service. For more information see: https://www.op-tee.org
|
||||
|
||||
if OPTEE
|
||||
if OPTEE || SANDBOX
|
||||
|
||||
menu "OP-TEE options"
|
||||
|
||||
|
|
308
drivers/tee/sandbox.c
Normal file
308
drivers/tee/sandbox.c
Normal file
|
@ -0,0 +1,308 @@
|
|||
// SPDX-License-Identifier: GPL-2.0+
|
||||
/*
|
||||
* Copyright (C) 2018 Linaro Limited
|
||||
*/
|
||||
#include <common.h>
|
||||
#include <dm.h>
|
||||
#include <sandboxtee.h>
|
||||
#include <tee.h>
|
||||
#include <tee/optee_ta_avb.h>
|
||||
|
||||
/*
|
||||
* The sandbox tee driver tries to emulate a generic Trusted Exectution
|
||||
* Environment (TEE) with the Trusted Application (TA) OPTEE_TA_AVB
|
||||
* available.
|
||||
*/
|
||||
|
||||
/**
|
||||
* struct ta_entry - TA entries
|
||||
* @uuid: UUID of an emulated TA
|
||||
* @open_session Called when a session is openened to the TA
|
||||
* @invoke_func Called when a function in the TA is to be invoked
|
||||
*
|
||||
* This struct is used to register TAs in this sandbox emulation of a TEE.
|
||||
*/
|
||||
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);
|
||||
};
|
||||
|
||||
#ifdef CONFIG_OPTEE_TA_AVB
|
||||
static u32 get_attr(uint n, uint num_params, struct tee_param *params)
|
||||
{
|
||||
if (n >= num_params)
|
||||
return TEE_PARAM_ATTR_TYPE_NONE;
|
||||
|
||||
return params[n].attr;
|
||||
}
|
||||
|
||||
static u32 check_params(u8 p0, u8 p1, u8 p2, u8 p3, uint num_params,
|
||||
struct tee_param *params)
|
||||
{
|
||||
u8 p[] = { p0, p1, p2, p3};
|
||||
uint n;
|
||||
|
||||
for (n = 0; n < ARRAY_SIZE(p); n++)
|
||||
if (p[n] != get_attr(n, num_params, params))
|
||||
goto bad_params;
|
||||
|
||||
for (; n < num_params; n++)
|
||||
if (get_attr(n, num_params, params))
|
||||
goto bad_params;
|
||||
|
||||
return TEE_SUCCESS;
|
||||
|
||||
bad_params:
|
||||
printf("Bad param attrs\n");
|
||||
|
||||
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)
|
||||
{
|
||||
/*
|
||||
* We don't expect additional parameters when opening a session to
|
||||
* this TA.
|
||||
*/
|
||||
return check_params(TEE_PARAM_ATTR_TYPE_NONE, TEE_PARAM_ATTR_TYPE_NONE,
|
||||
TEE_PARAM_ATTR_TYPE_NONE, TEE_PARAM_ATTR_TYPE_NONE,
|
||||
num_params, params);
|
||||
}
|
||||
|
||||
static u32 ta_avb_invoke_func(u32 func, uint num_params,
|
||||
struct tee_param *params)
|
||||
{
|
||||
u32 res;
|
||||
uint slot;
|
||||
u64 val;
|
||||
|
||||
switch (func) {
|
||||
case TA_AVB_CMD_READ_ROLLBACK_INDEX:
|
||||
res = check_params(TEE_PARAM_ATTR_TYPE_VALUE_INPUT,
|
||||
TEE_PARAM_ATTR_TYPE_VALUE_OUTPUT,
|
||||
TEE_PARAM_ATTR_TYPE_NONE,
|
||||
TEE_PARAM_ATTR_TYPE_NONE,
|
||||
num_params, params);
|
||||
if (res)
|
||||
return res;
|
||||
|
||||
slot = params[0].u.value.a;
|
||||
if (slot >= ARRAY_SIZE(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];
|
||||
params[1].u.value.a = val >> 32;
|
||||
params[1].u.value.b = val;
|
||||
return TEE_SUCCESS;
|
||||
|
||||
case TA_AVB_CMD_WRITE_ROLLBACK_INDEX:
|
||||
res = check_params(TEE_PARAM_ATTR_TYPE_VALUE_INPUT,
|
||||
TEE_PARAM_ATTR_TYPE_VALUE_INPUT,
|
||||
TEE_PARAM_ATTR_TYPE_NONE,
|
||||
TEE_PARAM_ATTR_TYPE_NONE,
|
||||
num_params, params);
|
||||
if (res)
|
||||
return res;
|
||||
|
||||
slot = params[0].u.value.a;
|
||||
if (slot >= ARRAY_SIZE(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])
|
||||
return TEE_ERROR_SECURITY;
|
||||
|
||||
ta_avb_rollback_indexes[slot] = val;
|
||||
return TEE_SUCCESS;
|
||||
|
||||
case TA_AVB_CMD_READ_LOCK_STATE:
|
||||
res = check_params(TEE_PARAM_ATTR_TYPE_VALUE_OUTPUT,
|
||||
TEE_PARAM_ATTR_TYPE_NONE,
|
||||
TEE_PARAM_ATTR_TYPE_NONE,
|
||||
TEE_PARAM_ATTR_TYPE_NONE,
|
||||
num_params, params);
|
||||
if (res)
|
||||
return res;
|
||||
|
||||
params[0].u.value.a = ta_avb_lock_state;
|
||||
return TEE_SUCCESS;
|
||||
|
||||
case TA_AVB_CMD_WRITE_LOCK_STATE:
|
||||
res = check_params(TEE_PARAM_ATTR_TYPE_VALUE_INPUT,
|
||||
TEE_PARAM_ATTR_TYPE_NONE,
|
||||
TEE_PARAM_ATTR_TYPE_NONE,
|
||||
TEE_PARAM_ATTR_TYPE_NONE,
|
||||
num_params, 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));
|
||||
}
|
||||
|
||||
return TEE_SUCCESS;
|
||||
|
||||
default:
|
||||
return TEE_ERROR_NOT_SUPPORTED;
|
||||
}
|
||||
}
|
||||
#endif /*OPTEE_TA_AVB*/
|
||||
|
||||
static const struct ta_entry ta_entries[] = {
|
||||
#ifdef CONFIG_OPTEE_TA_AVB
|
||||
{ .uuid = TA_AVB_UUID,
|
||||
.open_session = ta_avb_open_session,
|
||||
.invoke_func = ta_avb_invoke_func,
|
||||
},
|
||||
#endif
|
||||
};
|
||||
|
||||
static void sandbox_tee_get_version(struct udevice *dev,
|
||||
struct tee_version_data *vers)
|
||||
{
|
||||
struct tee_version_data v = {
|
||||
.gen_caps = TEE_GEN_CAP_GP | TEE_GEN_CAP_REG_MEM,
|
||||
};
|
||||
|
||||
*vers = v;
|
||||
}
|
||||
|
||||
static int sandbox_tee_close_session(struct udevice *dev, u32 session)
|
||||
{
|
||||
struct sandbox_tee_state *state = dev_get_priv(dev);
|
||||
|
||||
if (!state->ta || state->session != session)
|
||||
return -EINVAL;
|
||||
|
||||
state->session = 0;
|
||||
state->ta = NULL;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct ta_entry *find_ta_entry(u8 uuid[TEE_UUID_LEN])
|
||||
{
|
||||
struct tee_optee_ta_uuid u;
|
||||
uint n;
|
||||
|
||||
tee_optee_ta_uuid_from_octets(&u, uuid);
|
||||
|
||||
for (n = 0; n < ARRAY_SIZE(ta_entries); n++)
|
||||
if (!memcmp(&u, &ta_entries[n].uuid, sizeof(u)))
|
||||
return ta_entries + n;
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static int sandbox_tee_open_session(struct udevice *dev,
|
||||
struct tee_open_session_arg *arg,
|
||||
uint num_params, struct tee_param *params)
|
||||
{
|
||||
struct sandbox_tee_state *state = dev_get_priv(dev);
|
||||
const struct ta_entry *ta;
|
||||
|
||||
if (state->ta) {
|
||||
printf("A session is already open\n");
|
||||
return -EBUSY;
|
||||
}
|
||||
|
||||
ta = find_ta_entry(arg->uuid);
|
||||
if (!ta) {
|
||||
printf("Cannot find TA\n");
|
||||
arg->ret = TEE_ERROR_ITEM_NOT_FOUND;
|
||||
arg->ret_origin = TEE_ORIGIN_TEE;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
arg->ret = ta->open_session(num_params, params);
|
||||
arg->ret_origin = TEE_ORIGIN_TRUSTED_APP;
|
||||
|
||||
if (!arg->ret) {
|
||||
state->ta = (void *)ta;
|
||||
state->session = 1;
|
||||
arg->session = state->session;
|
||||
} else {
|
||||
printf("Cannot open session, TA returns error\n");
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int sandbox_tee_invoke_func(struct udevice *dev,
|
||||
struct tee_invoke_arg *arg,
|
||||
uint num_params, struct tee_param *params)
|
||||
{
|
||||
struct sandbox_tee_state *state = dev_get_priv(dev);
|
||||
struct ta_entry *ta = state->ta;
|
||||
|
||||
if (!arg->session) {
|
||||
printf("Missing session\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (!ta) {
|
||||
printf("TA session not available\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (arg->session != state->session) {
|
||||
printf("Session mismatch\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
arg->ret = ta->invoke_func(arg->func, num_params, params);
|
||||
arg->ret_origin = TEE_ORIGIN_TRUSTED_APP;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int sandbox_tee_shm_register(struct udevice *dev, struct tee_shm *shm)
|
||||
{
|
||||
struct sandbox_tee_state *state = dev_get_priv(dev);
|
||||
|
||||
state->num_shms++;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int sandbox_tee_shm_unregister(struct udevice *dev, struct tee_shm *shm)
|
||||
{
|
||||
struct sandbox_tee_state *state = dev_get_priv(dev);
|
||||
|
||||
state->num_shms--;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct tee_driver_ops sandbox_tee_ops = {
|
||||
.get_version = sandbox_tee_get_version,
|
||||
.open_session = sandbox_tee_open_session,
|
||||
.close_session = sandbox_tee_close_session,
|
||||
.invoke_func = sandbox_tee_invoke_func,
|
||||
.shm_register = sandbox_tee_shm_register,
|
||||
.shm_unregister = sandbox_tee_shm_unregister,
|
||||
};
|
||||
|
||||
static const struct udevice_id sandbox_tee_match[] = {
|
||||
{ .compatible = "sandbox,tee" },
|
||||
{},
|
||||
};
|
||||
|
||||
U_BOOT_DRIVER(sandbox_tee) = {
|
||||
.name = "sandbox_tee",
|
||||
.id = UCLASS_TEE,
|
||||
.of_match = sandbox_tee_match,
|
||||
.ops = &sandbox_tee_ops,
|
||||
.priv_auto_alloc_size = sizeof(struct sandbox_tee_state),
|
||||
};
|
21
include/sandboxtee.h
Normal file
21
include/sandboxtee.h
Normal file
|
@ -0,0 +1,21 @@
|
|||
/* SPDX-License-Identifier: GPL-2.0+ */
|
||||
/*
|
||||
* Copyright (C) 2018 Linaro Limited
|
||||
*/
|
||||
|
||||
#ifndef __SANDBOXTEE_H
|
||||
#define __SANDBOXTEE_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
|
||||
*/
|
||||
struct sandbox_tee_state {
|
||||
u32 session;
|
||||
int num_shms;
|
||||
void *ta;
|
||||
};
|
||||
|
||||
#endif /*__SANDBOXTEE_H*/
|
Loading…
Reference in a new issue