mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 02:23:16 +00:00
056d3fed3d
Adds the two new functions tee_shm_register_user_buf() and tee_shm_register_kernel_buf() which should be used instead of the old tee_shm_register(). This avoids having the caller supplying the flags parameter which exposes a bit more than desired of the internals of the TEE subsystem. Reviewed-by: Sumit Garg <sumit.garg@linaro.org> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
1275 lines
30 KiB
C
1275 lines
30 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (c) 2015-2016, Linaro Limited
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "%s: " fmt, __func__
|
|
|
|
#include <linux/cdev.h>
|
|
#include <linux/cred.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/idr.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/tee_drv.h>
|
|
#include <linux/uaccess.h>
|
|
#include <crypto/hash.h>
|
|
#include <crypto/sha1.h>
|
|
#include "tee_private.h"
|
|
|
|
#define TEE_NUM_DEVICES 32
|
|
|
|
#define TEE_IOCTL_PARAM_SIZE(x) (sizeof(struct tee_param) * (x))
|
|
|
|
#define TEE_UUID_NS_NAME_SIZE 128
|
|
|
|
/*
|
|
* TEE Client UUID name space identifier (UUIDv4)
|
|
*
|
|
* Value here is random UUID that is allocated as name space identifier for
|
|
* forming Client UUID's for TEE environment using UUIDv5 scheme.
|
|
*/
|
|
static const uuid_t tee_client_uuid_ns = UUID_INIT(0x58ac9ca0, 0x2086, 0x4683,
|
|
0xa1, 0xb8, 0xec, 0x4b,
|
|
0xc0, 0x8e, 0x01, 0xb6);
|
|
|
|
/*
|
|
* Unprivileged devices in the lower half range and privileged devices in
|
|
* the upper half range.
|
|
*/
|
|
static DECLARE_BITMAP(dev_mask, TEE_NUM_DEVICES);
|
|
static DEFINE_SPINLOCK(driver_lock);
|
|
|
|
static struct class *tee_class;
|
|
static dev_t tee_devt;
|
|
|
|
struct tee_context *teedev_open(struct tee_device *teedev)
|
|
{
|
|
int rc;
|
|
struct tee_context *ctx;
|
|
|
|
if (!tee_device_get(teedev))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
|
|
if (!ctx) {
|
|
rc = -ENOMEM;
|
|
goto err;
|
|
}
|
|
|
|
kref_init(&ctx->refcount);
|
|
ctx->teedev = teedev;
|
|
rc = teedev->desc->ops->open(ctx);
|
|
if (rc)
|
|
goto err;
|
|
|
|
return ctx;
|
|
err:
|
|
kfree(ctx);
|
|
tee_device_put(teedev);
|
|
return ERR_PTR(rc);
|
|
|
|
}
|
|
EXPORT_SYMBOL_GPL(teedev_open);
|
|
|
|
void teedev_ctx_get(struct tee_context *ctx)
|
|
{
|
|
if (ctx->releasing)
|
|
return;
|
|
|
|
kref_get(&ctx->refcount);
|
|
}
|
|
|
|
static void teedev_ctx_release(struct kref *ref)
|
|
{
|
|
struct tee_context *ctx = container_of(ref, struct tee_context,
|
|
refcount);
|
|
ctx->releasing = true;
|
|
ctx->teedev->desc->ops->release(ctx);
|
|
kfree(ctx);
|
|
}
|
|
|
|
void teedev_ctx_put(struct tee_context *ctx)
|
|
{
|
|
if (ctx->releasing)
|
|
return;
|
|
|
|
kref_put(&ctx->refcount, teedev_ctx_release);
|
|
}
|
|
|
|
void teedev_close_context(struct tee_context *ctx)
|
|
{
|
|
struct tee_device *teedev = ctx->teedev;
|
|
|
|
teedev_ctx_put(ctx);
|
|
tee_device_put(teedev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(teedev_close_context);
|
|
|
|
static int tee_open(struct inode *inode, struct file *filp)
|
|
{
|
|
struct tee_context *ctx;
|
|
|
|
ctx = teedev_open(container_of(inode->i_cdev, struct tee_device, cdev));
|
|
if (IS_ERR(ctx))
|
|
return PTR_ERR(ctx);
|
|
|
|
/*
|
|
* Default user-space behaviour is to wait for tee-supplicant
|
|
* if not present for any requests in this context.
|
|
*/
|
|
ctx->supp_nowait = false;
|
|
filp->private_data = ctx;
|
|
return 0;
|
|
}
|
|
|
|
static int tee_release(struct inode *inode, struct file *filp)
|
|
{
|
|
teedev_close_context(filp->private_data);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* uuid_v5() - Calculate UUIDv5
|
|
* @uuid: Resulting UUID
|
|
* @ns: Name space ID for UUIDv5 function
|
|
* @name: Name for UUIDv5 function
|
|
* @size: Size of name
|
|
*
|
|
* UUIDv5 is specific in RFC 4122.
|
|
*
|
|
* This implements section (for SHA-1):
|
|
* 4.3. Algorithm for Creating a Name-Based UUID
|
|
*/
|
|
static int uuid_v5(uuid_t *uuid, const uuid_t *ns, const void *name,
|
|
size_t size)
|
|
{
|
|
unsigned char hash[SHA1_DIGEST_SIZE];
|
|
struct crypto_shash *shash = NULL;
|
|
struct shash_desc *desc = NULL;
|
|
int rc;
|
|
|
|
shash = crypto_alloc_shash("sha1", 0, 0);
|
|
if (IS_ERR(shash)) {
|
|
rc = PTR_ERR(shash);
|
|
pr_err("shash(sha1) allocation failed\n");
|
|
return rc;
|
|
}
|
|
|
|
desc = kzalloc(sizeof(*desc) + crypto_shash_descsize(shash),
|
|
GFP_KERNEL);
|
|
if (!desc) {
|
|
rc = -ENOMEM;
|
|
goto out_free_shash;
|
|
}
|
|
|
|
desc->tfm = shash;
|
|
|
|
rc = crypto_shash_init(desc);
|
|
if (rc < 0)
|
|
goto out_free_desc;
|
|
|
|
rc = crypto_shash_update(desc, (const u8 *)ns, sizeof(*ns));
|
|
if (rc < 0)
|
|
goto out_free_desc;
|
|
|
|
rc = crypto_shash_update(desc, (const u8 *)name, size);
|
|
if (rc < 0)
|
|
goto out_free_desc;
|
|
|
|
rc = crypto_shash_final(desc, hash);
|
|
if (rc < 0)
|
|
goto out_free_desc;
|
|
|
|
memcpy(uuid->b, hash, UUID_SIZE);
|
|
|
|
/* Tag for version 5 */
|
|
uuid->b[6] = (hash[6] & 0x0F) | 0x50;
|
|
uuid->b[8] = (hash[8] & 0x3F) | 0x80;
|
|
|
|
out_free_desc:
|
|
kfree(desc);
|
|
|
|
out_free_shash:
|
|
crypto_free_shash(shash);
|
|
return rc;
|
|
}
|
|
|
|
int tee_session_calc_client_uuid(uuid_t *uuid, u32 connection_method,
|
|
const u8 connection_data[TEE_IOCTL_UUID_LEN])
|
|
{
|
|
gid_t ns_grp = (gid_t)-1;
|
|
kgid_t grp = INVALID_GID;
|
|
char *name = NULL;
|
|
int name_len;
|
|
int rc;
|
|
|
|
if (connection_method == TEE_IOCTL_LOGIN_PUBLIC ||
|
|
connection_method == TEE_IOCTL_LOGIN_REE_KERNEL) {
|
|
/* Nil UUID to be passed to TEE environment */
|
|
uuid_copy(uuid, &uuid_null);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* In Linux environment client UUID is based on UUIDv5.
|
|
*
|
|
* Determine client UUID with following semantics for 'name':
|
|
*
|
|
* For TEEC_LOGIN_USER:
|
|
* uid=<uid>
|
|
*
|
|
* For TEEC_LOGIN_GROUP:
|
|
* gid=<gid>
|
|
*
|
|
*/
|
|
|
|
name = kzalloc(TEE_UUID_NS_NAME_SIZE, GFP_KERNEL);
|
|
if (!name)
|
|
return -ENOMEM;
|
|
|
|
switch (connection_method) {
|
|
case TEE_IOCTL_LOGIN_USER:
|
|
name_len = snprintf(name, TEE_UUID_NS_NAME_SIZE, "uid=%x",
|
|
current_euid().val);
|
|
if (name_len >= TEE_UUID_NS_NAME_SIZE) {
|
|
rc = -E2BIG;
|
|
goto out_free_name;
|
|
}
|
|
break;
|
|
|
|
case TEE_IOCTL_LOGIN_GROUP:
|
|
memcpy(&ns_grp, connection_data, sizeof(gid_t));
|
|
grp = make_kgid(current_user_ns(), ns_grp);
|
|
if (!gid_valid(grp) || !in_egroup_p(grp)) {
|
|
rc = -EPERM;
|
|
goto out_free_name;
|
|
}
|
|
|
|
name_len = snprintf(name, TEE_UUID_NS_NAME_SIZE, "gid=%x",
|
|
grp.val);
|
|
if (name_len >= TEE_UUID_NS_NAME_SIZE) {
|
|
rc = -E2BIG;
|
|
goto out_free_name;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
rc = -EINVAL;
|
|
goto out_free_name;
|
|
}
|
|
|
|
rc = uuid_v5(uuid, &tee_client_uuid_ns, name, name_len);
|
|
out_free_name:
|
|
kfree(name);
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tee_session_calc_client_uuid);
|
|
|
|
static int tee_ioctl_version(struct tee_context *ctx,
|
|
struct tee_ioctl_version_data __user *uvers)
|
|
{
|
|
struct tee_ioctl_version_data vers;
|
|
|
|
ctx->teedev->desc->ops->get_version(ctx->teedev, &vers);
|
|
|
|
if (ctx->teedev->desc->flags & TEE_DESC_PRIVILEGED)
|
|
vers.gen_caps |= TEE_GEN_CAP_PRIVILEGED;
|
|
|
|
if (copy_to_user(uvers, &vers, sizeof(vers)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tee_ioctl_shm_alloc(struct tee_context *ctx,
|
|
struct tee_ioctl_shm_alloc_data __user *udata)
|
|
{
|
|
long ret;
|
|
struct tee_ioctl_shm_alloc_data data;
|
|
struct tee_shm *shm;
|
|
|
|
if (copy_from_user(&data, udata, sizeof(data)))
|
|
return -EFAULT;
|
|
|
|
/* Currently no input flags are supported */
|
|
if (data.flags)
|
|
return -EINVAL;
|
|
|
|
shm = tee_shm_alloc_user_buf(ctx, data.size);
|
|
if (IS_ERR(shm))
|
|
return PTR_ERR(shm);
|
|
|
|
data.id = shm->id;
|
|
data.flags = shm->flags;
|
|
data.size = shm->size;
|
|
|
|
if (copy_to_user(udata, &data, sizeof(data)))
|
|
ret = -EFAULT;
|
|
else
|
|
ret = tee_shm_get_fd(shm);
|
|
|
|
/*
|
|
* When user space closes the file descriptor the shared memory
|
|
* should be freed or if tee_shm_get_fd() failed then it will
|
|
* be freed immediately.
|
|
*/
|
|
tee_shm_put(shm);
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
tee_ioctl_shm_register(struct tee_context *ctx,
|
|
struct tee_ioctl_shm_register_data __user *udata)
|
|
{
|
|
long ret;
|
|
struct tee_ioctl_shm_register_data data;
|
|
struct tee_shm *shm;
|
|
|
|
if (copy_from_user(&data, udata, sizeof(data)))
|
|
return -EFAULT;
|
|
|
|
/* Currently no input flags are supported */
|
|
if (data.flags)
|
|
return -EINVAL;
|
|
|
|
shm = tee_shm_register_user_buf(ctx, data.addr, data.length);
|
|
if (IS_ERR(shm))
|
|
return PTR_ERR(shm);
|
|
|
|
data.id = shm->id;
|
|
data.flags = shm->flags;
|
|
data.length = shm->size;
|
|
|
|
if (copy_to_user(udata, &data, sizeof(data)))
|
|
ret = -EFAULT;
|
|
else
|
|
ret = tee_shm_get_fd(shm);
|
|
/*
|
|
* When user space closes the file descriptor the shared memory
|
|
* should be freed or if tee_shm_get_fd() failed then it will
|
|
* be freed immediately.
|
|
*/
|
|
tee_shm_put(shm);
|
|
return ret;
|
|
}
|
|
|
|
static int params_from_user(struct tee_context *ctx, struct tee_param *params,
|
|
size_t num_params,
|
|
struct tee_ioctl_param __user *uparams)
|
|
{
|
|
size_t n;
|
|
|
|
for (n = 0; n < num_params; n++) {
|
|
struct tee_shm *shm;
|
|
struct tee_ioctl_param ip;
|
|
|
|
if (copy_from_user(&ip, uparams + n, sizeof(ip)))
|
|
return -EFAULT;
|
|
|
|
/* All unused attribute bits has to be zero */
|
|
if (ip.attr & ~TEE_IOCTL_PARAM_ATTR_MASK)
|
|
return -EINVAL;
|
|
|
|
params[n].attr = ip.attr;
|
|
switch (ip.attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK) {
|
|
case TEE_IOCTL_PARAM_ATTR_TYPE_NONE:
|
|
case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
|
|
break;
|
|
case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT:
|
|
case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
|
|
params[n].u.value.a = ip.a;
|
|
params[n].u.value.b = ip.b;
|
|
params[n].u.value.c = ip.c;
|
|
break;
|
|
case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
|
|
case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
|
|
case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
|
|
/*
|
|
* If a NULL pointer is passed to a TA in the TEE,
|
|
* the ip.c IOCTL parameters is set to TEE_MEMREF_NULL
|
|
* indicating a NULL memory reference.
|
|
*/
|
|
if (ip.c != TEE_MEMREF_NULL) {
|
|
/*
|
|
* If we fail to get a pointer to a shared
|
|
* memory object (and increase the ref count)
|
|
* from an identifier we return an error. All
|
|
* pointers that has been added in params have
|
|
* an increased ref count. It's the callers
|
|
* responibility to do tee_shm_put() on all
|
|
* resolved pointers.
|
|
*/
|
|
shm = tee_shm_get_from_id(ctx, ip.c);
|
|
if (IS_ERR(shm))
|
|
return PTR_ERR(shm);
|
|
|
|
/*
|
|
* Ensure offset + size does not overflow
|
|
* offset and does not overflow the size of
|
|
* the referred shared memory object.
|
|
*/
|
|
if ((ip.a + ip.b) < ip.a ||
|
|
(ip.a + ip.b) > shm->size) {
|
|
tee_shm_put(shm);
|
|
return -EINVAL;
|
|
}
|
|
} else if (ctx->cap_memref_null) {
|
|
/* Pass NULL pointer to OP-TEE */
|
|
shm = NULL;
|
|
} else {
|
|
return -EINVAL;
|
|
}
|
|
|
|
params[n].u.memref.shm_offs = ip.a;
|
|
params[n].u.memref.size = ip.b;
|
|
params[n].u.memref.shm = shm;
|
|
break;
|
|
default:
|
|
/* Unknown attribute */
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int params_to_user(struct tee_ioctl_param __user *uparams,
|
|
size_t num_params, struct tee_param *params)
|
|
{
|
|
size_t n;
|
|
|
|
for (n = 0; n < num_params; n++) {
|
|
struct tee_ioctl_param __user *up = uparams + n;
|
|
struct tee_param *p = params + n;
|
|
|
|
switch (p->attr) {
|
|
case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
|
|
case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
|
|
if (put_user(p->u.value.a, &up->a) ||
|
|
put_user(p->u.value.b, &up->b) ||
|
|
put_user(p->u.value.c, &up->c))
|
|
return -EFAULT;
|
|
break;
|
|
case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
|
|
case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
|
|
if (put_user((u64)p->u.memref.size, &up->b))
|
|
return -EFAULT;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int tee_ioctl_open_session(struct tee_context *ctx,
|
|
struct tee_ioctl_buf_data __user *ubuf)
|
|
{
|
|
int rc;
|
|
size_t n;
|
|
struct tee_ioctl_buf_data buf;
|
|
struct tee_ioctl_open_session_arg __user *uarg;
|
|
struct tee_ioctl_open_session_arg arg;
|
|
struct tee_ioctl_param __user *uparams = NULL;
|
|
struct tee_param *params = NULL;
|
|
bool have_session = false;
|
|
|
|
if (!ctx->teedev->desc->ops->open_session)
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(&buf, ubuf, sizeof(buf)))
|
|
return -EFAULT;
|
|
|
|
if (buf.buf_len > TEE_MAX_ARG_SIZE ||
|
|
buf.buf_len < sizeof(struct tee_ioctl_open_session_arg))
|
|
return -EINVAL;
|
|
|
|
uarg = u64_to_user_ptr(buf.buf_ptr);
|
|
if (copy_from_user(&arg, uarg, sizeof(arg)))
|
|
return -EFAULT;
|
|
|
|
if (sizeof(arg) + TEE_IOCTL_PARAM_SIZE(arg.num_params) != buf.buf_len)
|
|
return -EINVAL;
|
|
|
|
if (arg.num_params) {
|
|
params = kcalloc(arg.num_params, sizeof(struct tee_param),
|
|
GFP_KERNEL);
|
|
if (!params)
|
|
return -ENOMEM;
|
|
uparams = uarg->params;
|
|
rc = params_from_user(ctx, params, arg.num_params, uparams);
|
|
if (rc)
|
|
goto out;
|
|
}
|
|
|
|
if (arg.clnt_login >= TEE_IOCTL_LOGIN_REE_KERNEL_MIN &&
|
|
arg.clnt_login <= TEE_IOCTL_LOGIN_REE_KERNEL_MAX) {
|
|
pr_debug("login method not allowed for user-space client\n");
|
|
rc = -EPERM;
|
|
goto out;
|
|
}
|
|
|
|
rc = ctx->teedev->desc->ops->open_session(ctx, &arg, params);
|
|
if (rc)
|
|
goto out;
|
|
have_session = true;
|
|
|
|
if (put_user(arg.session, &uarg->session) ||
|
|
put_user(arg.ret, &uarg->ret) ||
|
|
put_user(arg.ret_origin, &uarg->ret_origin)) {
|
|
rc = -EFAULT;
|
|
goto out;
|
|
}
|
|
rc = params_to_user(uparams, arg.num_params, params);
|
|
out:
|
|
/*
|
|
* If we've succeeded to open the session but failed to communicate
|
|
* it back to user space, close the session again to avoid leakage.
|
|
*/
|
|
if (rc && have_session && ctx->teedev->desc->ops->close_session)
|
|
ctx->teedev->desc->ops->close_session(ctx, arg.session);
|
|
|
|
if (params) {
|
|
/* Decrease ref count for all valid shared memory pointers */
|
|
for (n = 0; n < arg.num_params; n++)
|
|
if (tee_param_is_memref(params + n) &&
|
|
params[n].u.memref.shm)
|
|
tee_shm_put(params[n].u.memref.shm);
|
|
kfree(params);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int tee_ioctl_invoke(struct tee_context *ctx,
|
|
struct tee_ioctl_buf_data __user *ubuf)
|
|
{
|
|
int rc;
|
|
size_t n;
|
|
struct tee_ioctl_buf_data buf;
|
|
struct tee_ioctl_invoke_arg __user *uarg;
|
|
struct tee_ioctl_invoke_arg arg;
|
|
struct tee_ioctl_param __user *uparams = NULL;
|
|
struct tee_param *params = NULL;
|
|
|
|
if (!ctx->teedev->desc->ops->invoke_func)
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(&buf, ubuf, sizeof(buf)))
|
|
return -EFAULT;
|
|
|
|
if (buf.buf_len > TEE_MAX_ARG_SIZE ||
|
|
buf.buf_len < sizeof(struct tee_ioctl_invoke_arg))
|
|
return -EINVAL;
|
|
|
|
uarg = u64_to_user_ptr(buf.buf_ptr);
|
|
if (copy_from_user(&arg, uarg, sizeof(arg)))
|
|
return -EFAULT;
|
|
|
|
if (sizeof(arg) + TEE_IOCTL_PARAM_SIZE(arg.num_params) != buf.buf_len)
|
|
return -EINVAL;
|
|
|
|
if (arg.num_params) {
|
|
params = kcalloc(arg.num_params, sizeof(struct tee_param),
|
|
GFP_KERNEL);
|
|
if (!params)
|
|
return -ENOMEM;
|
|
uparams = uarg->params;
|
|
rc = params_from_user(ctx, params, arg.num_params, uparams);
|
|
if (rc)
|
|
goto out;
|
|
}
|
|
|
|
rc = ctx->teedev->desc->ops->invoke_func(ctx, &arg, params);
|
|
if (rc)
|
|
goto out;
|
|
|
|
if (put_user(arg.ret, &uarg->ret) ||
|
|
put_user(arg.ret_origin, &uarg->ret_origin)) {
|
|
rc = -EFAULT;
|
|
goto out;
|
|
}
|
|
rc = params_to_user(uparams, arg.num_params, params);
|
|
out:
|
|
if (params) {
|
|
/* Decrease ref count for all valid shared memory pointers */
|
|
for (n = 0; n < arg.num_params; n++)
|
|
if (tee_param_is_memref(params + n) &&
|
|
params[n].u.memref.shm)
|
|
tee_shm_put(params[n].u.memref.shm);
|
|
kfree(params);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
static int tee_ioctl_cancel(struct tee_context *ctx,
|
|
struct tee_ioctl_cancel_arg __user *uarg)
|
|
{
|
|
struct tee_ioctl_cancel_arg arg;
|
|
|
|
if (!ctx->teedev->desc->ops->cancel_req)
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(&arg, uarg, sizeof(arg)))
|
|
return -EFAULT;
|
|
|
|
return ctx->teedev->desc->ops->cancel_req(ctx, arg.cancel_id,
|
|
arg.session);
|
|
}
|
|
|
|
static int
|
|
tee_ioctl_close_session(struct tee_context *ctx,
|
|
struct tee_ioctl_close_session_arg __user *uarg)
|
|
{
|
|
struct tee_ioctl_close_session_arg arg;
|
|
|
|
if (!ctx->teedev->desc->ops->close_session)
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(&arg, uarg, sizeof(arg)))
|
|
return -EFAULT;
|
|
|
|
return ctx->teedev->desc->ops->close_session(ctx, arg.session);
|
|
}
|
|
|
|
static int params_to_supp(struct tee_context *ctx,
|
|
struct tee_ioctl_param __user *uparams,
|
|
size_t num_params, struct tee_param *params)
|
|
{
|
|
size_t n;
|
|
|
|
for (n = 0; n < num_params; n++) {
|
|
struct tee_ioctl_param ip;
|
|
struct tee_param *p = params + n;
|
|
|
|
ip.attr = p->attr;
|
|
switch (p->attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK) {
|
|
case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT:
|
|
case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
|
|
ip.a = p->u.value.a;
|
|
ip.b = p->u.value.b;
|
|
ip.c = p->u.value.c;
|
|
break;
|
|
case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
|
|
case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
|
|
case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
|
|
ip.b = p->u.memref.size;
|
|
if (!p->u.memref.shm) {
|
|
ip.a = 0;
|
|
ip.c = (u64)-1; /* invalid shm id */
|
|
break;
|
|
}
|
|
ip.a = p->u.memref.shm_offs;
|
|
ip.c = p->u.memref.shm->id;
|
|
break;
|
|
default:
|
|
ip.a = 0;
|
|
ip.b = 0;
|
|
ip.c = 0;
|
|
break;
|
|
}
|
|
|
|
if (copy_to_user(uparams + n, &ip, sizeof(ip)))
|
|
return -EFAULT;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tee_ioctl_supp_recv(struct tee_context *ctx,
|
|
struct tee_ioctl_buf_data __user *ubuf)
|
|
{
|
|
int rc;
|
|
struct tee_ioctl_buf_data buf;
|
|
struct tee_iocl_supp_recv_arg __user *uarg;
|
|
struct tee_param *params;
|
|
u32 num_params;
|
|
u32 func;
|
|
|
|
if (!ctx->teedev->desc->ops->supp_recv)
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(&buf, ubuf, sizeof(buf)))
|
|
return -EFAULT;
|
|
|
|
if (buf.buf_len > TEE_MAX_ARG_SIZE ||
|
|
buf.buf_len < sizeof(struct tee_iocl_supp_recv_arg))
|
|
return -EINVAL;
|
|
|
|
uarg = u64_to_user_ptr(buf.buf_ptr);
|
|
if (get_user(num_params, &uarg->num_params))
|
|
return -EFAULT;
|
|
|
|
if (sizeof(*uarg) + TEE_IOCTL_PARAM_SIZE(num_params) != buf.buf_len)
|
|
return -EINVAL;
|
|
|
|
params = kcalloc(num_params, sizeof(struct tee_param), GFP_KERNEL);
|
|
if (!params)
|
|
return -ENOMEM;
|
|
|
|
rc = params_from_user(ctx, params, num_params, uarg->params);
|
|
if (rc)
|
|
goto out;
|
|
|
|
rc = ctx->teedev->desc->ops->supp_recv(ctx, &func, &num_params, params);
|
|
if (rc)
|
|
goto out;
|
|
|
|
if (put_user(func, &uarg->func) ||
|
|
put_user(num_params, &uarg->num_params)) {
|
|
rc = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
rc = params_to_supp(ctx, uarg->params, num_params, params);
|
|
out:
|
|
kfree(params);
|
|
return rc;
|
|
}
|
|
|
|
static int params_from_supp(struct tee_param *params, size_t num_params,
|
|
struct tee_ioctl_param __user *uparams)
|
|
{
|
|
size_t n;
|
|
|
|
for (n = 0; n < num_params; n++) {
|
|
struct tee_param *p = params + n;
|
|
struct tee_ioctl_param ip;
|
|
|
|
if (copy_from_user(&ip, uparams + n, sizeof(ip)))
|
|
return -EFAULT;
|
|
|
|
/* All unused attribute bits has to be zero */
|
|
if (ip.attr & ~TEE_IOCTL_PARAM_ATTR_MASK)
|
|
return -EINVAL;
|
|
|
|
p->attr = ip.attr;
|
|
switch (ip.attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK) {
|
|
case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
|
|
case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
|
|
/* Only out and in/out values can be updated */
|
|
p->u.value.a = ip.a;
|
|
p->u.value.b = ip.b;
|
|
p->u.value.c = ip.c;
|
|
break;
|
|
case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
|
|
case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
|
|
/*
|
|
* Only the size of the memref can be updated.
|
|
* Since we don't have access to the original
|
|
* parameters here, only store the supplied size.
|
|
* The driver will copy the updated size into the
|
|
* original parameters.
|
|
*/
|
|
p->u.memref.shm = NULL;
|
|
p->u.memref.shm_offs = 0;
|
|
p->u.memref.size = ip.b;
|
|
break;
|
|
default:
|
|
memset(&p->u, 0, sizeof(p->u));
|
|
break;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int tee_ioctl_supp_send(struct tee_context *ctx,
|
|
struct tee_ioctl_buf_data __user *ubuf)
|
|
{
|
|
long rc;
|
|
struct tee_ioctl_buf_data buf;
|
|
struct tee_iocl_supp_send_arg __user *uarg;
|
|
struct tee_param *params;
|
|
u32 num_params;
|
|
u32 ret;
|
|
|
|
/* Not valid for this driver */
|
|
if (!ctx->teedev->desc->ops->supp_send)
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(&buf, ubuf, sizeof(buf)))
|
|
return -EFAULT;
|
|
|
|
if (buf.buf_len > TEE_MAX_ARG_SIZE ||
|
|
buf.buf_len < sizeof(struct tee_iocl_supp_send_arg))
|
|
return -EINVAL;
|
|
|
|
uarg = u64_to_user_ptr(buf.buf_ptr);
|
|
if (get_user(ret, &uarg->ret) ||
|
|
get_user(num_params, &uarg->num_params))
|
|
return -EFAULT;
|
|
|
|
if (sizeof(*uarg) + TEE_IOCTL_PARAM_SIZE(num_params) > buf.buf_len)
|
|
return -EINVAL;
|
|
|
|
params = kcalloc(num_params, sizeof(struct tee_param), GFP_KERNEL);
|
|
if (!params)
|
|
return -ENOMEM;
|
|
|
|
rc = params_from_supp(params, num_params, uarg->params);
|
|
if (rc)
|
|
goto out;
|
|
|
|
rc = ctx->teedev->desc->ops->supp_send(ctx, ret, num_params, params);
|
|
out:
|
|
kfree(params);
|
|
return rc;
|
|
}
|
|
|
|
static long tee_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct tee_context *ctx = filp->private_data;
|
|
void __user *uarg = (void __user *)arg;
|
|
|
|
switch (cmd) {
|
|
case TEE_IOC_VERSION:
|
|
return tee_ioctl_version(ctx, uarg);
|
|
case TEE_IOC_SHM_ALLOC:
|
|
return tee_ioctl_shm_alloc(ctx, uarg);
|
|
case TEE_IOC_SHM_REGISTER:
|
|
return tee_ioctl_shm_register(ctx, uarg);
|
|
case TEE_IOC_OPEN_SESSION:
|
|
return tee_ioctl_open_session(ctx, uarg);
|
|
case TEE_IOC_INVOKE:
|
|
return tee_ioctl_invoke(ctx, uarg);
|
|
case TEE_IOC_CANCEL:
|
|
return tee_ioctl_cancel(ctx, uarg);
|
|
case TEE_IOC_CLOSE_SESSION:
|
|
return tee_ioctl_close_session(ctx, uarg);
|
|
case TEE_IOC_SUPPL_RECV:
|
|
return tee_ioctl_supp_recv(ctx, uarg);
|
|
case TEE_IOC_SUPPL_SEND:
|
|
return tee_ioctl_supp_send(ctx, uarg);
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static const struct file_operations tee_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = tee_open,
|
|
.release = tee_release,
|
|
.unlocked_ioctl = tee_ioctl,
|
|
.compat_ioctl = compat_ptr_ioctl,
|
|
};
|
|
|
|
static void tee_release_device(struct device *dev)
|
|
{
|
|
struct tee_device *teedev = container_of(dev, struct tee_device, dev);
|
|
|
|
spin_lock(&driver_lock);
|
|
clear_bit(teedev->id, dev_mask);
|
|
spin_unlock(&driver_lock);
|
|
mutex_destroy(&teedev->mutex);
|
|
idr_destroy(&teedev->idr);
|
|
kfree(teedev);
|
|
}
|
|
|
|
/**
|
|
* tee_device_alloc() - Allocate a new struct tee_device instance
|
|
* @teedesc: Descriptor for this driver
|
|
* @dev: Parent device for this device
|
|
* @pool: Shared memory pool, NULL if not used
|
|
* @driver_data: Private driver data for this device
|
|
*
|
|
* Allocates a new struct tee_device instance. The device is
|
|
* removed by tee_device_unregister().
|
|
*
|
|
* @returns a pointer to a 'struct tee_device' or an ERR_PTR on failure
|
|
*/
|
|
struct tee_device *tee_device_alloc(const struct tee_desc *teedesc,
|
|
struct device *dev,
|
|
struct tee_shm_pool *pool,
|
|
void *driver_data)
|
|
{
|
|
struct tee_device *teedev;
|
|
void *ret;
|
|
int rc, max_id;
|
|
int offs = 0;
|
|
|
|
if (!teedesc || !teedesc->name || !teedesc->ops ||
|
|
!teedesc->ops->get_version || !teedesc->ops->open ||
|
|
!teedesc->ops->release || !pool)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
teedev = kzalloc(sizeof(*teedev), GFP_KERNEL);
|
|
if (!teedev) {
|
|
ret = ERR_PTR(-ENOMEM);
|
|
goto err;
|
|
}
|
|
|
|
max_id = TEE_NUM_DEVICES / 2;
|
|
|
|
if (teedesc->flags & TEE_DESC_PRIVILEGED) {
|
|
offs = TEE_NUM_DEVICES / 2;
|
|
max_id = TEE_NUM_DEVICES;
|
|
}
|
|
|
|
spin_lock(&driver_lock);
|
|
teedev->id = find_next_zero_bit(dev_mask, max_id, offs);
|
|
if (teedev->id < max_id)
|
|
set_bit(teedev->id, dev_mask);
|
|
spin_unlock(&driver_lock);
|
|
|
|
if (teedev->id >= max_id) {
|
|
ret = ERR_PTR(-ENOMEM);
|
|
goto err;
|
|
}
|
|
|
|
snprintf(teedev->name, sizeof(teedev->name), "tee%s%d",
|
|
teedesc->flags & TEE_DESC_PRIVILEGED ? "priv" : "",
|
|
teedev->id - offs);
|
|
|
|
teedev->dev.class = tee_class;
|
|
teedev->dev.release = tee_release_device;
|
|
teedev->dev.parent = dev;
|
|
|
|
teedev->dev.devt = MKDEV(MAJOR(tee_devt), teedev->id);
|
|
|
|
rc = dev_set_name(&teedev->dev, "%s", teedev->name);
|
|
if (rc) {
|
|
ret = ERR_PTR(rc);
|
|
goto err_devt;
|
|
}
|
|
|
|
cdev_init(&teedev->cdev, &tee_fops);
|
|
teedev->cdev.owner = teedesc->owner;
|
|
|
|
dev_set_drvdata(&teedev->dev, driver_data);
|
|
device_initialize(&teedev->dev);
|
|
|
|
/* 1 as tee_device_unregister() does one final tee_device_put() */
|
|
teedev->num_users = 1;
|
|
init_completion(&teedev->c_no_users);
|
|
mutex_init(&teedev->mutex);
|
|
idr_init(&teedev->idr);
|
|
|
|
teedev->desc = teedesc;
|
|
teedev->pool = pool;
|
|
|
|
return teedev;
|
|
err_devt:
|
|
unregister_chrdev_region(teedev->dev.devt, 1);
|
|
err:
|
|
pr_err("could not register %s driver\n",
|
|
teedesc->flags & TEE_DESC_PRIVILEGED ? "privileged" : "client");
|
|
if (teedev && teedev->id < TEE_NUM_DEVICES) {
|
|
spin_lock(&driver_lock);
|
|
clear_bit(teedev->id, dev_mask);
|
|
spin_unlock(&driver_lock);
|
|
}
|
|
kfree(teedev);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tee_device_alloc);
|
|
|
|
static ssize_t implementation_id_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct tee_device *teedev = container_of(dev, struct tee_device, dev);
|
|
struct tee_ioctl_version_data vers;
|
|
|
|
teedev->desc->ops->get_version(teedev, &vers);
|
|
return scnprintf(buf, PAGE_SIZE, "%d\n", vers.impl_id);
|
|
}
|
|
static DEVICE_ATTR_RO(implementation_id);
|
|
|
|
static struct attribute *tee_dev_attrs[] = {
|
|
&dev_attr_implementation_id.attr,
|
|
NULL
|
|
};
|
|
|
|
ATTRIBUTE_GROUPS(tee_dev);
|
|
|
|
/**
|
|
* tee_device_register() - Registers a TEE device
|
|
* @teedev: Device to register
|
|
*
|
|
* tee_device_unregister() need to be called to remove the @teedev if
|
|
* this function fails.
|
|
*
|
|
* @returns < 0 on failure
|
|
*/
|
|
int tee_device_register(struct tee_device *teedev)
|
|
{
|
|
int rc;
|
|
|
|
if (teedev->flags & TEE_DEVICE_FLAG_REGISTERED) {
|
|
dev_err(&teedev->dev, "attempt to register twice\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
teedev->dev.groups = tee_dev_groups;
|
|
|
|
rc = cdev_device_add(&teedev->cdev, &teedev->dev);
|
|
if (rc) {
|
|
dev_err(&teedev->dev,
|
|
"unable to cdev_device_add() %s, major %d, minor %d, err=%d\n",
|
|
teedev->name, MAJOR(teedev->dev.devt),
|
|
MINOR(teedev->dev.devt), rc);
|
|
return rc;
|
|
}
|
|
|
|
teedev->flags |= TEE_DEVICE_FLAG_REGISTERED;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tee_device_register);
|
|
|
|
void tee_device_put(struct tee_device *teedev)
|
|
{
|
|
mutex_lock(&teedev->mutex);
|
|
/* Shouldn't put in this state */
|
|
if (!WARN_ON(!teedev->desc)) {
|
|
teedev->num_users--;
|
|
if (!teedev->num_users) {
|
|
teedev->desc = NULL;
|
|
complete(&teedev->c_no_users);
|
|
}
|
|
}
|
|
mutex_unlock(&teedev->mutex);
|
|
}
|
|
|
|
bool tee_device_get(struct tee_device *teedev)
|
|
{
|
|
mutex_lock(&teedev->mutex);
|
|
if (!teedev->desc) {
|
|
mutex_unlock(&teedev->mutex);
|
|
return false;
|
|
}
|
|
teedev->num_users++;
|
|
mutex_unlock(&teedev->mutex);
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* tee_device_unregister() - Removes a TEE device
|
|
* @teedev: Device to unregister
|
|
*
|
|
* This function should be called to remove the @teedev even if
|
|
* tee_device_register() hasn't been called yet. Does nothing if
|
|
* @teedev is NULL.
|
|
*/
|
|
void tee_device_unregister(struct tee_device *teedev)
|
|
{
|
|
if (!teedev)
|
|
return;
|
|
|
|
if (teedev->flags & TEE_DEVICE_FLAG_REGISTERED)
|
|
cdev_device_del(&teedev->cdev, &teedev->dev);
|
|
|
|
tee_device_put(teedev);
|
|
wait_for_completion(&teedev->c_no_users);
|
|
|
|
/*
|
|
* No need to take a mutex any longer now since teedev->desc was
|
|
* set to NULL before teedev->c_no_users was completed.
|
|
*/
|
|
|
|
teedev->pool = NULL;
|
|
|
|
put_device(&teedev->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(tee_device_unregister);
|
|
|
|
/**
|
|
* tee_get_drvdata() - Return driver_data pointer
|
|
* @teedev: Device containing the driver_data pointer
|
|
* @returns the driver_data pointer supplied to tee_register().
|
|
*/
|
|
void *tee_get_drvdata(struct tee_device *teedev)
|
|
{
|
|
return dev_get_drvdata(&teedev->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(tee_get_drvdata);
|
|
|
|
struct match_dev_data {
|
|
struct tee_ioctl_version_data *vers;
|
|
const void *data;
|
|
int (*match)(struct tee_ioctl_version_data *, const void *);
|
|
};
|
|
|
|
static int match_dev(struct device *dev, const void *data)
|
|
{
|
|
const struct match_dev_data *match_data = data;
|
|
struct tee_device *teedev = container_of(dev, struct tee_device, dev);
|
|
|
|
teedev->desc->ops->get_version(teedev, match_data->vers);
|
|
return match_data->match(match_data->vers, match_data->data);
|
|
}
|
|
|
|
struct tee_context *
|
|
tee_client_open_context(struct tee_context *start,
|
|
int (*match)(struct tee_ioctl_version_data *,
|
|
const void *),
|
|
const void *data, struct tee_ioctl_version_data *vers)
|
|
{
|
|
struct device *dev = NULL;
|
|
struct device *put_dev = NULL;
|
|
struct tee_context *ctx = NULL;
|
|
struct tee_ioctl_version_data v;
|
|
struct match_dev_data match_data = { vers ? vers : &v, data, match };
|
|
|
|
if (start)
|
|
dev = &start->teedev->dev;
|
|
|
|
do {
|
|
dev = class_find_device(tee_class, dev, &match_data, match_dev);
|
|
if (!dev) {
|
|
ctx = ERR_PTR(-ENOENT);
|
|
break;
|
|
}
|
|
|
|
put_device(put_dev);
|
|
put_dev = dev;
|
|
|
|
ctx = teedev_open(container_of(dev, struct tee_device, dev));
|
|
} while (IS_ERR(ctx) && PTR_ERR(ctx) != -ENOMEM);
|
|
|
|
put_device(put_dev);
|
|
/*
|
|
* Default behaviour for in kernel client is to not wait for
|
|
* tee-supplicant if not present for any requests in this context.
|
|
* Also this flag could be configured again before call to
|
|
* tee_client_open_session() if any in kernel client requires
|
|
* different behaviour.
|
|
*/
|
|
if (!IS_ERR(ctx))
|
|
ctx->supp_nowait = true;
|
|
|
|
return ctx;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tee_client_open_context);
|
|
|
|
void tee_client_close_context(struct tee_context *ctx)
|
|
{
|
|
teedev_close_context(ctx);
|
|
}
|
|
EXPORT_SYMBOL_GPL(tee_client_close_context);
|
|
|
|
void tee_client_get_version(struct tee_context *ctx,
|
|
struct tee_ioctl_version_data *vers)
|
|
{
|
|
ctx->teedev->desc->ops->get_version(ctx->teedev, vers);
|
|
}
|
|
EXPORT_SYMBOL_GPL(tee_client_get_version);
|
|
|
|
int tee_client_open_session(struct tee_context *ctx,
|
|
struct tee_ioctl_open_session_arg *arg,
|
|
struct tee_param *param)
|
|
{
|
|
if (!ctx->teedev->desc->ops->open_session)
|
|
return -EINVAL;
|
|
return ctx->teedev->desc->ops->open_session(ctx, arg, param);
|
|
}
|
|
EXPORT_SYMBOL_GPL(tee_client_open_session);
|
|
|
|
int tee_client_close_session(struct tee_context *ctx, u32 session)
|
|
{
|
|
if (!ctx->teedev->desc->ops->close_session)
|
|
return -EINVAL;
|
|
return ctx->teedev->desc->ops->close_session(ctx, session);
|
|
}
|
|
EXPORT_SYMBOL_GPL(tee_client_close_session);
|
|
|
|
int tee_client_invoke_func(struct tee_context *ctx,
|
|
struct tee_ioctl_invoke_arg *arg,
|
|
struct tee_param *param)
|
|
{
|
|
if (!ctx->teedev->desc->ops->invoke_func)
|
|
return -EINVAL;
|
|
return ctx->teedev->desc->ops->invoke_func(ctx, arg, param);
|
|
}
|
|
EXPORT_SYMBOL_GPL(tee_client_invoke_func);
|
|
|
|
int tee_client_cancel_req(struct tee_context *ctx,
|
|
struct tee_ioctl_cancel_arg *arg)
|
|
{
|
|
if (!ctx->teedev->desc->ops->cancel_req)
|
|
return -EINVAL;
|
|
return ctx->teedev->desc->ops->cancel_req(ctx, arg->cancel_id,
|
|
arg->session);
|
|
}
|
|
|
|
static int tee_client_device_match(struct device *dev,
|
|
struct device_driver *drv)
|
|
{
|
|
const struct tee_client_device_id *id_table;
|
|
struct tee_client_device *tee_device;
|
|
|
|
id_table = to_tee_client_driver(drv)->id_table;
|
|
tee_device = to_tee_client_device(dev);
|
|
|
|
while (!uuid_is_null(&id_table->uuid)) {
|
|
if (uuid_equal(&tee_device->id.uuid, &id_table->uuid))
|
|
return 1;
|
|
id_table++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tee_client_device_uevent(struct device *dev,
|
|
struct kobj_uevent_env *env)
|
|
{
|
|
uuid_t *dev_id = &to_tee_client_device(dev)->id.uuid;
|
|
|
|
return add_uevent_var(env, "MODALIAS=tee:%pUb", dev_id);
|
|
}
|
|
|
|
struct bus_type tee_bus_type = {
|
|
.name = "tee",
|
|
.match = tee_client_device_match,
|
|
.uevent = tee_client_device_uevent,
|
|
};
|
|
EXPORT_SYMBOL_GPL(tee_bus_type);
|
|
|
|
static int __init tee_init(void)
|
|
{
|
|
int rc;
|
|
|
|
tee_class = class_create(THIS_MODULE, "tee");
|
|
if (IS_ERR(tee_class)) {
|
|
pr_err("couldn't create class\n");
|
|
return PTR_ERR(tee_class);
|
|
}
|
|
|
|
rc = alloc_chrdev_region(&tee_devt, 0, TEE_NUM_DEVICES, "tee");
|
|
if (rc) {
|
|
pr_err("failed to allocate char dev region\n");
|
|
goto out_unreg_class;
|
|
}
|
|
|
|
rc = bus_register(&tee_bus_type);
|
|
if (rc) {
|
|
pr_err("failed to register tee bus\n");
|
|
goto out_unreg_chrdev;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_unreg_chrdev:
|
|
unregister_chrdev_region(tee_devt, TEE_NUM_DEVICES);
|
|
out_unreg_class:
|
|
class_destroy(tee_class);
|
|
tee_class = NULL;
|
|
|
|
return rc;
|
|
}
|
|
|
|
static void __exit tee_exit(void)
|
|
{
|
|
bus_unregister(&tee_bus_type);
|
|
unregister_chrdev_region(tee_devt, TEE_NUM_DEVICES);
|
|
class_destroy(tee_class);
|
|
tee_class = NULL;
|
|
}
|
|
|
|
subsys_initcall(tee_init);
|
|
module_exit(tee_exit);
|
|
|
|
MODULE_AUTHOR("Linaro");
|
|
MODULE_DESCRIPTION("TEE Driver");
|
|
MODULE_VERSION("1.0");
|
|
MODULE_LICENSE("GPL v2");
|