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authorJens Wiklander <jens.wiklander@linaro.org>2016-12-23 13:13:34 +0100
committerJens Wiklander <jens.wiklander@linaro.org>2017-11-29 10:37:13 +0100
commitf2aa97240c84b8f258710e297ba60048bd9c153e (patch)
treefe2a175a3e8c59927a2ba414c01f060027703fc7 /drivers/tee
parenttee: add tee_param_is_memref() for driver use (diff)
downloadlinux-f2aa97240c84b8f258710e297ba60048bd9c153e.tar.xz
linux-f2aa97240c84b8f258710e297ba60048bd9c153e.zip
tee: add TEE_IOCTL_PARAM_ATTR_META
Adds TEE_IOCTL_PARAM_ATTR_META which can be used to indicate meta parameters when communicating with user space. These meta parameters can be used by supplicant support multiple parallel requests at a time. Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Diffstat (limited to 'drivers/tee')
-rw-r--r--drivers/tee/optee/supp.c25
-rw-r--r--drivers/tee/tee_core.c16
2 files changed, 35 insertions, 6 deletions
diff --git a/drivers/tee/optee/supp.c b/drivers/tee/optee/supp.c
index b4ea0678a436..56aa8b929b8c 100644
--- a/drivers/tee/optee/supp.c
+++ b/drivers/tee/optee/supp.c
@@ -119,6 +119,27 @@ u32 optee_supp_thrd_req(struct tee_context *ctx, u32 func, size_t num_params,
return ret;
}
+static int supp_check_recv_params(size_t num_params, struct tee_param *params)
+{
+ size_t n;
+
+ /*
+ * 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 (0).
+ */
+ for (n = 0; n < num_params; n++)
+ if (params[n].attr)
+ return -EINVAL;
+ return 0;
+}
+
/**
* optee_supp_recv() - receive request for supplicant
* @ctx: context receiving the request
@@ -137,6 +158,10 @@ int optee_supp_recv(struct tee_context *ctx, u32 *func, u32 *num_params,
struct optee_supp *supp = &optee->supp;
int rc;
+ rc = supp_check_recv_params(*num_params, param);
+ if (rc)
+ return rc;
+
/*
* In case two threads in one supplicant is calling this function
* simultaneously we need to protect the data with a mutex which
diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c
index c78104589e42..4d0ce606f0fc 100644
--- a/drivers/tee/tee_core.c
+++ b/drivers/tee/tee_core.c
@@ -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;
@@ -394,8 +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;
@@ -459,6 +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;
@@ -488,11 +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 */