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Enable async communication with tee supplicant

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This pull request enables asynchronous communication with TEE supplicant
 by introducing meta parameters in the user space API. The meta
 parameters can be used to tag requests with an id that can be matched
 against an asynchronous response as is done here in the OP-TEE driver.
 
 Asynchronous supplicant communication is needed by OP-TEE to implement
 GlobalPlatforms TEE Sockets API Specification v1.0.1. The specification
 is available at https://www.globalplatform.org/specificationsdevice.asp.
 
 This change is backwards compatible allowing older supplicants to work
 with newer kernels and vice versa.
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Merge tag 'tee-drv-async-supplicant-for-v4.16' of https://git.linaro.org/people/jens.wiklander/linux-tee into next/drivers

Pull "Enable async communication with tee supplicant" from Jens Wiklander:

This pull request enables asynchronous communication with TEE supplicant
by introducing meta parameters in the user space API. The meta
parameters can be used to tag requests with an id that can be matched
against an asynchronous response as is done here in the OP-TEE driver.

Asynchronous supplicant communication is needed by OP-TEE to implement
GlobalPlatforms TEE Sockets API Specification v1.0.1. The specification
is available at https://www.globalplatform.org/specificationsdevice.asp.

This change is backwards compatible allowing older supplicants to work
with newer kernels and vice versa.

* tag 'tee-drv-async-supplicant-for-v4.16' of https://git.linaro.org/people/jens.wiklander/linux-tee:
  optee: support asynchronous supplicant requests
  tee: add TEE_IOCTL_PARAM_ATTR_META
  tee: add tee_param_is_memref() for driver use
This commit is contained in:
Arnd Bergmann 2017-12-21 16:02:07 +01:00
commit a8e9f5f672
7 changed files with 297 additions and 191 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/tee/optee/core.c
View File

@ -187,12 +187,12 @@ static int optee_open(struct tee_context *ctx)
if (teedev == optee->supp_teedev) {
bool busy = true;
mutex_lock(&optee->supp.ctx_mutex);
mutex_lock(&optee->supp.mutex);
if (!optee->supp.ctx) {
busy = false;
optee->supp.ctx = ctx;
}
mutex_unlock(&optee->supp.ctx_mutex);
mutex_unlock(&optee->supp.mutex);
if (busy) {
kfree(ctxdata);
return -EBUSY;
@ -252,11 +252,8 @@ static void optee_release(struct tee_context *ctx)
ctx->data = NULL;
if (teedev == optee->supp_teedev) {
mutex_lock(&optee->supp.ctx_mutex);
optee->supp.ctx = NULL;
mutex_unlock(&optee->supp.ctx_mutex);
}
if (teedev == optee->supp_teedev)
optee_supp_release(&optee->supp);
}
static const struct tee_driver_ops optee_ops = {

41
drivers/tee/optee/optee_private.h
View File

@ -53,36 +53,24 @@ struct optee_wait_queue {
* @ctx the context of current connected supplicant.
* if !NULL the supplicant device is available for use,
* else busy
* @ctx_mutex: held while accessing @ctx
* @func: supplicant function id to call
* @ret: call return value
* @num_params: number of elements in @param
* @param: parameters for @func
* @req_posted: if true, a request has been posted to the supplicant
* @supp_next_send: if true, next step is for supplicant to send response
* @thrd_mutex: held by the thread doing a request to supplicant
* @supp_mutex: held by supplicant while operating on this struct
* @data_to_supp: supplicant is waiting on this for next request
* @data_from_supp: requesting thread is waiting on this to get the result
* @mutex: held while accessing content of this struct
* @req_id: current request id if supplicant is doing synchronous
* communication, else -1
* @reqs: queued request not yet retrieved by supplicant
* @idr: IDR holding all requests currently being processed
* by supplicant
* @reqs_c: completion used by supplicant when waiting for a
* request to be queued.
*/
struct optee_supp {
/* Serializes access to this struct */
struct mutex mutex;
struct tee_context *ctx;
/* Serializes access of ctx */
struct mutex ctx_mutex;
u32 func;
u32 ret;
size_t num_params;
struct tee_param *param;
bool req_posted;
bool supp_next_send;
/* Serializes access to this struct for requesting thread */
struct mutex thrd_mutex;
/* Serializes access to this struct for supplicant threads */
struct mutex supp_mutex;
struct completion data_to_supp;
struct completion data_from_supp;
int req_id;
struct list_head reqs;
struct idr idr;
struct completion reqs_c;
};
/**
@ -142,6 +130,7 @@ int optee_supp_read(struct tee_context *ctx, void __user *buf, size_t len);
int optee_supp_write(struct tee_context *ctx, void __user *buf, size_t len);
void optee_supp_init(struct optee_supp *supp);
void optee_supp_uninit(struct optee_supp *supp);
void optee_supp_release(struct optee_supp *supp);
int optee_supp_recv(struct tee_context *ctx, u32 *func, u32 *num_params,
struct tee_param *param);

4
drivers/tee/optee/rpc.c
View File

@ -192,10 +192,10 @@ static struct tee_shm *cmd_alloc_suppl(struct tee_context *ctx, size_t sz)
if (ret)
return ERR_PTR(-ENOMEM);
mutex_lock(&optee->supp.ctx_mutex);
mutex_lock(&optee->supp.mutex);
/* Increases count as secure world doesn't have a reference */
shm = tee_shm_get_from_id(optee->supp.ctx, param.u.value.c);
mutex_unlock(&optee->supp.ctx_mutex);
mutex_unlock(&optee->supp.mutex);
return shm;
}

381
drivers/tee/optee/supp.c
View File

@ -16,21 +16,61 @@
#include <linux/uaccess.h>
#include "optee_private.h"
struct optee_supp_req {
struct list_head link;
bool busy;
u32 func;
u32 ret;
size_t num_params;
struct tee_param *param;
struct completion c;
};
void optee_supp_init(struct optee_supp *supp)
{
memset(supp, 0, sizeof(*supp));
mutex_init(&supp->ctx_mutex);
mutex_init(&supp->thrd_mutex);
mutex_init(&supp->supp_mutex);
init_completion(&supp->data_to_supp);
init_completion(&supp->data_from_supp);
mutex_init(&supp->mutex);
init_completion(&supp->reqs_c);
idr_init(&supp->idr);
INIT_LIST_HEAD(&supp->reqs);
supp->req_id = -1;
}
void optee_supp_uninit(struct optee_supp *supp)
{
mutex_destroy(&supp->ctx_mutex);
mutex_destroy(&supp->thrd_mutex);
mutex_destroy(&supp->supp_mutex);
mutex_destroy(&supp->mutex);
idr_destroy(&supp->idr);
}
void optee_supp_release(struct optee_supp *supp)
{
int id;
struct optee_supp_req *req;
struct optee_supp_req *req_tmp;
mutex_lock(&supp->mutex);
/* Abort all request retrieved by supplicant */
idr_for_each_entry(&supp->idr, req, id) {
req->busy = false;
idr_remove(&supp->idr, id);
req->ret = TEEC_ERROR_COMMUNICATION;
complete(&req->c);
}
/* Abort all queued requests */
list_for_each_entry_safe(req, req_tmp, &supp->reqs, link) {
list_del(&req->link);
req->ret = TEEC_ERROR_COMMUNICATION;
complete(&req->c);
}
supp->ctx = NULL;
supp->req_id = -1;
mutex_unlock(&supp->mutex);
}
/**
@ -44,53 +84,42 @@ void optee_supp_uninit(struct optee_supp *supp)
*/
u32 optee_supp_thrd_req(struct tee_context *ctx, u32 func, size_t num_params,
struct tee_param *param)
{
bool interruptable;
struct optee *optee = tee_get_drvdata(ctx->teedev);
struct optee_supp *supp = &optee->supp;
struct optee_supp_req *req = kzalloc(sizeof(*req), GFP_KERNEL);
bool interruptable;
u32 ret;
/*
* Other threads blocks here until we've copied our answer from
* supplicant.
*/
while (mutex_lock_interruptible(&supp->thrd_mutex)) {
/* See comment below on when the RPC can be interrupted. */
mutex_lock(&supp->ctx_mutex);
interruptable = !supp->ctx;
mutex_unlock(&supp->ctx_mutex);
if (interruptable)
return TEEC_ERROR_COMMUNICATION;
}
if (!req)
return TEEC_ERROR_OUT_OF_MEMORY;
/*
* We have exclusive access now since the supplicant at this
* point is either doing a
* wait_for_completion_interruptible(&supp->data_to_supp) or is in
* userspace still about to do the ioctl() to enter
* optee_supp_recv() below.
*/
init_completion(&req->c);
req->func = func;
req->num_params = num_params;
req->param = param;
supp->func = func;
supp->num_params = num_params;
supp->param = param;
supp->req_posted = true;
/* Insert the request in the request list */
mutex_lock(&supp->mutex);
list_add_tail(&req->link, &supp->reqs);
mutex_unlock(&supp->mutex);
/* Let supplicant get the data */
complete(&supp->data_to_supp);
/* Tell an eventual waiter there's a new request */
complete(&supp->reqs_c);
/*
* Wait for supplicant to process and return result, once we've
* returned from wait_for_completion(data_from_supp) we have
* returned from wait_for_completion(&req->c) successfully we have
* exclusive access again.
*/
while (wait_for_completion_interruptible(&supp->data_from_supp)) {
mutex_lock(&supp->ctx_mutex);
while (wait_for_completion_interruptible(&req->c)) {
mutex_lock(&supp->mutex);
interruptable = !supp->ctx;
if (interruptable) {
/*
* There's no supplicant available and since the
* supp->ctx_mutex currently is held none can
* supp->mutex currently is held none can
* become available until the mutex released
* again.
*
@ -101,24 +130,91 @@ u32 optee_supp_thrd_req(struct tee_context *ctx, u32 func, size_t num_params,
* will serve all requests in a timely manner and
* interrupting then wouldn't make sense.
*/
supp->ret = TEEC_ERROR_COMMUNICATION;
init_completion(&supp->data_to_supp);
interruptable = !req->busy;
if (!req->busy)
list_del(&req->link);
}
mutex_unlock(&supp->ctx_mutex);
if (interruptable)
mutex_unlock(&supp->mutex);
if (interruptable) {
req->ret = TEEC_ERROR_COMMUNICATION;
break;
}
}
ret = supp->ret;
supp->param = NULL;
supp->req_posted = false;
/* We're done, let someone else talk to the supplicant now. */
mutex_unlock(&supp->thrd_mutex);
ret = req->ret;
kfree(req);
return ret;
}
static struct optee_supp_req *supp_pop_entry(struct optee_supp *supp,
int num_params, int *id)
{
struct optee_supp_req *req;
if (supp->req_id != -1) {
/*
* Supplicant should not mix synchronous and asnynchronous
* requests.
*/
return ERR_PTR(-EINVAL);
}
if (list_empty(&supp->reqs))
return NULL;
req = list_first_entry(&supp->reqs, struct optee_supp_req, link);
if (num_params < req->num_params) {
/* Not enough room for parameters */
return ERR_PTR(-EINVAL);
}
*id = idr_alloc(&supp->idr, req, 1, 0, GFP_KERNEL);
if (*id < 0)
return ERR_PTR(-ENOMEM);
list_del(&req->link);
req->busy = true;
return req;
}
static int supp_check_recv_params(size_t num_params, struct tee_param *params,
size_t *num_meta)
{
size_t n;
if (!num_params)
return -EINVAL;
/*
* If there's memrefs we need to decrease those as they where
* increased earlier and we'll even refuse to accept any below.
*/
for (n = 0; n < num_params; n++)
if (tee_param_is_memref(params + n) && params[n].u.memref.shm)
tee_shm_put(params[n].u.memref.shm);
/*
* We only expect parameters as TEE_IOCTL_PARAM_ATTR_TYPE_NONE with
* or without the TEE_IOCTL_PARAM_ATTR_META bit set.
*/
for (n = 0; n < num_params; n++)
if (params[n].attr &&
params[n].attr != TEE_IOCTL_PARAM_ATTR_META)
return -EINVAL;
/* At most we'll need one meta parameter so no need to check for more */
if (params->attr == TEE_IOCTL_PARAM_ATTR_META)
*num_meta = 1;
else
*num_meta = 0;
return 0;
}
/**
* optee_supp_recv() - receive request for supplicant
* @ctx: context receiving the request
@ -135,65 +231,99 @@ int optee_supp_recv(struct tee_context *ctx, u32 *func, u32 *num_params,
struct tee_device *teedev = ctx->teedev;
struct optee *optee = tee_get_drvdata(teedev);
struct optee_supp *supp = &optee->supp;
struct optee_supp_req *req = NULL;
int id;
size_t num_meta;
int rc;
/*
* In case two threads in one supplicant is calling this function
* simultaneously we need to protect the data with a mutex which
* we'll release before returning.
*/
mutex_lock(&supp->supp_mutex);
rc = supp_check_recv_params(*num_params, param, &num_meta);
if (rc)
return rc;
if (supp->supp_next_send) {
/*
* optee_supp_recv() has been called again without
* a optee_supp_send() in between. Supplicant has
* probably been restarted before it was able to
* write back last result. Abort last request and
* wait for a new.
*/
if (supp->req_posted) {
supp->ret = TEEC_ERROR_COMMUNICATION;
supp->supp_next_send = false;
complete(&supp->data_from_supp);
while (true) {
mutex_lock(&supp->mutex);
req = supp_pop_entry(supp, *num_params - num_meta, &id);
mutex_unlock(&supp->mutex);
if (req) {
if (IS_ERR(req))
return PTR_ERR(req);
break;
}
}
/*
* This is where supplicant will be hanging most of the
* time, let's make this interruptable so we can easily
* restart supplicant if needed.
*/
if (wait_for_completion_interruptible(&supp->data_to_supp)) {
rc = -ERESTARTSYS;
goto out;
}
/* We have exlusive access to the data */
if (*num_params < supp->num_params) {
/*
* Not enough room for parameters, tell supplicant
* it failed and abort last request.
* If we didn't get a request we'll block in
* wait_for_completion() to avoid needless spinning.
*
* This is where supplicant will be hanging most of
* the time, let's make this interruptable so we
* can easily restart supplicant if needed.
*/
supp->ret = TEEC_ERROR_COMMUNICATION;
rc = -EINVAL;
complete(&supp->data_from_supp);
goto out;
if (wait_for_completion_interruptible(&supp->reqs_c))
return -ERESTARTSYS;
}
*func = supp->func;
*num_params = supp->num_params;
memcpy(param, supp->param,
sizeof(struct tee_param) * supp->num_params);
if (num_meta) {
/*
* tee-supplicant support meta parameters -> requsts can be
* processed asynchronously.
*/
param->attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT |
TEE_IOCTL_PARAM_ATTR_META;
param->u.value.a = id;
param->u.value.b = 0;
param->u.value.c = 0;
} else {
mutex_lock(&supp->mutex);
supp->req_id = id;
mutex_unlock(&supp->mutex);
}
/* Allow optee_supp_send() below to do its work */
supp->supp_next_send = true;
*func = req->func;
*num_params = req->num_params + num_meta;
memcpy(param + num_meta, req->param,
sizeof(struct tee_param) * req->num_params);
rc = 0;
out:
mutex_unlock(&supp->supp_mutex);
return rc;
return 0;
}
static struct optee_supp_req *supp_pop_req(struct optee_supp *supp,
size_t num_params,
struct tee_param *param,
size_t *num_meta)
{
struct optee_supp_req *req;
int id;
size_t nm;
const u32 attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT |
TEE_IOCTL_PARAM_ATTR_META;
if (!num_params)
return ERR_PTR(-EINVAL);
if (supp->req_id == -1) {
if (param->attr != attr)
return ERR_PTR(-EINVAL);
id = param->u.value.a;
nm = 1;
} else {
id = supp->req_id;
nm = 0;
}
req = idr_find(&supp->idr, id);
if (!req)
return ERR_PTR(-ENOENT);
if ((num_params - nm) != req->num_params)
return ERR_PTR(-EINVAL);
req->busy = false;
idr_remove(&supp->idr, id);
supp->req_id = -1;
*num_meta = nm;
return req;
}
/**
@ -211,63 +341,42 @@ int optee_supp_send(struct tee_context *ctx, u32 ret, u32 num_params,
struct tee_device *teedev = ctx->teedev;
struct optee *optee = tee_get_drvdata(teedev);
struct optee_supp *supp = &optee->supp;
struct optee_supp_req *req;
size_t n;
int rc = 0;
size_t num_meta;
/*
* We still have exclusive access to the data since that's how we
* left it when returning from optee_supp_read().
*/
mutex_lock(&supp->mutex);
req = supp_pop_req(supp, num_params, param, &num_meta);
mutex_unlock(&supp->mutex);
/* See comment on mutex in optee_supp_read() above */
mutex_lock(&supp->supp_mutex);
if (!supp->supp_next_send) {
/*
* Something strange is going on, supplicant shouldn't
* enter optee_supp_send() in this state
*/
rc = -ENOENT;
goto out;
}
if (num_params != supp->num_params) {
/*
* Something is wrong, let supplicant restart. Next call to
* optee_supp_recv() will give an error to the requesting
* thread and release it.
*/
rc = -EINVAL;
goto out;
if (IS_ERR(req)) {
/* Something is wrong, let supplicant restart. */
return PTR_ERR(req);
}
/* Update out and in/out parameters */
for (n = 0; n < num_params; n++) {
struct tee_param *p = supp->param + n;
for (n = 0; n < req->num_params; n++) {
struct tee_param *p = req->param + n;
switch (p->attr) {
switch (p->attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK) {
case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
p->u.value.a = param[n].u.value.a;
p->u.value.b = param[n].u.value.b;
p->u.value.c = param[n].u.value.c;
p->u.value.a = param[n + num_meta].u.value.a;
p->u.value.b = param[n + num_meta].u.value.b;
p->u.value.c = param[n + num_meta].u.value.c;
break;
case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
p->u.memref.size = param[n].u.memref.size;
p->u.memref.size = param[n + num_meta].u.memref.size;
break;
default:
break;
}
}
supp->ret = ret;
/* Allow optee_supp_recv() above to do its work */
supp->supp_next_send = false;
req->ret = ret;
/* Let the requesting thread continue */
complete(&supp->data_from_supp);
out:
mutex_unlock(&supp->supp_mutex);
return rc;
complete(&req->c);
return 0;
}

32
drivers/tee/tee_core.c
View File

@ -152,11 +152,11 @@ static int params_from_user(struct tee_context *ctx, struct tee_param *params,
return -EFAULT;
/* All unused attribute bits has to be zero */
if (ip.attr & ~TEE_IOCTL_PARAM_ATTR_TYPE_MASK)
if (ip.attr & ~TEE_IOCTL_PARAM_ATTR_MASK)
return -EINVAL;
params[n].attr = ip.attr;
switch (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;
@ -221,18 +221,6 @@ static int params_to_user(struct tee_ioctl_param __user *uparams,
return 0;
}
static bool param_is_memref(struct tee_param *param)
{
switch (param->attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK) {
case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
return true;
default:
return false;
}
}
static int tee_ioctl_open_session(struct tee_context *ctx,
struct tee_ioctl_buf_data __user *ubuf)
{
@ -296,7 +284,7 @@ out:
if (params) {
/* Decrease ref count for all valid shared memory pointers */
for (n = 0; n < arg.num_params; n++)
if (param_is_memref(params + n) &&
if (tee_param_is_memref(params + n) &&
params[n].u.memref.shm)
tee_shm_put(params[n].u.memref.shm);
kfree(params);
@ -358,7 +346,7 @@ out:
if (params) {
/* Decrease ref count for all valid shared memory pointers */
for (n = 0; n < arg.num_params; n++)
if (param_is_memref(params + n) &&
if (tee_param_is_memref(params + n) &&
params[n].u.memref.shm)
tee_shm_put(params[n].u.memref.shm);
kfree(params);
@ -406,8 +394,8 @@ static int params_to_supp(struct tee_context *ctx,
struct tee_ioctl_param ip;
struct tee_param *p = params + n;
ip.attr = p->attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK;
switch (p->attr) {
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;
@ -471,6 +459,10 @@ static int tee_ioctl_supp_recv(struct tee_context *ctx,
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;
@ -500,11 +492,11 @@ static int params_from_supp(struct tee_param *params, size_t num_params,
return -EFAULT;
/* All unused attribute bits has to be zero */
if (ip.attr & ~TEE_IOCTL_PARAM_ATTR_TYPE_MASK)
if (ip.attr & ~TEE_IOCTL_PARAM_ATTR_MASK)
return -EINVAL;
p->attr = ip.attr;
switch (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 */

12
include/linux/tee_drv.h
View File

@ -275,4 +275,16 @@ int tee_shm_get_id(struct tee_shm *shm);
*/
struct tee_shm *tee_shm_get_from_id(struct tee_context *ctx, int id);
static inline bool tee_param_is_memref(struct tee_param *param)
{
switch (param->attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK) {
case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
return true;
default:
return false;
}
}
#endif /*__TEE_DRV_H*/

7
include/uapi/linux/tee.h
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@ -154,6 +154,13 @@ struct tee_ioctl_buf_data {
*/
#define TEE_IOCTL_PARAM_ATTR_TYPE_MASK 0xff
/* Meta parameter carrying extra information about the message. */
#define TEE_IOCTL_PARAM_ATTR_META 0x100
/* Mask of all known attr bits */
#define TEE_IOCTL_PARAM_ATTR_MASK \
(TEE_IOCTL_PARAM_ATTR_TYPE_MASK | TEE_IOCTL_PARAM_ATTR_META)
/*
* Matches TEEC_LOGIN_* in GP TEE Client API
* Are only defined for GP compliant TEEs