Re: [PATCH v2 4/8] tee: add TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF

From: Amirreza Zarrabi
Date: Mon Feb 17 2025 - 18:50:23 EST

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In reply to: Jens Wiklander: "Re: [PATCH v2 4/8] tee: add TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF"
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On 2/17/2025 9:28 PM, Jens Wiklander wrote:
> Hi,
>
> On Sun, Feb 02, 2025 at 06:43:32PM -0800, Amirreza Zarrabi wrote:
>> The TEE subsystem allows session-based access to trusted services,
>> requiring a session to be established to receive a service. This
>> is not suitable for an environment that represents services as objects.
>> An object supports various operations that a client can invoke,
>> potentially generating a result or a new object that can be invoked
>> independently of the original object.
>>
>> Add TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_INPUT/OUTPUT/INOUT to represent an
>> object. Objects may reside in either TEE or userspace. To invoke an
>> object in TEE, introduce a new ioctl. Use the existing SUPPL_RECV and
>> SUPPL_SEND to invoke an object in userspace.
>>
>> Signed-off-by: Amirreza Zarrabi <quic_azarrabi@xxxxxxxxxxx>
>> ---
>> drivers/tee/tee_core.c | 85 ++++++++++++++++++++++++++++++++++++++++++++++++
>> include/linux/tee_core.h | 4 +++
>> include/linux/tee_drv.h | 6 ++++
>> include/uapi/linux/tee.h | 41 +++++++++++++++++++----
>> 4 files changed, 130 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c
>> index 9f4b9a995e16..fe435772688c 100644
>> --- a/drivers/tee/tee_core.c
>> +++ b/drivers/tee/tee_core.c
>> @@ -379,6 +379,7 @@ static int params_from_user(struct tee_context *ctx, struct tee_param *params,
>> switch (ip.attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK) {
>> case TEE_IOCTL_PARAM_ATTR_TYPE_NONE:
>> case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
>> + case TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_OUTPUT:
>> break;
>> case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT:
>> case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
>> @@ -396,6 +397,11 @@ static int params_from_user(struct tee_context *ctx, struct tee_param *params,
>> return -EFAULT;
>>
>> break;
>> + case TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_INPUT:
>> + case TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_INOUT:
>> + params[n].u.objref.id = ip.a;
>> + params[n].u.objref.flags = ip.b;
>> + 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:
>> @@ -469,6 +475,12 @@ static int params_to_user(struct tee_ioctl_param __user *uparams,
>> if (put_user((u64)p->u.ubuf.size, &up->b))
>> return -EFAULT;
>> break;
>> + case TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_OUTPUT:
>> + case TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_INOUT:
>> + if (put_user(p->u.objref.id, &up->a) ||
>> + put_user(p->u.objref.flags, &up->b))
>> + 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))
>> @@ -621,6 +633,66 @@ static int tee_ioctl_invoke(struct tee_context *ctx,
>> return rc;
>> }
>>
>> +static int tee_ioctl_object_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_object_invoke_arg __user *uarg;
>> + struct tee_ioctl_object_invoke_arg arg;
>> + struct tee_ioctl_param __user *uparams = NULL;
>> + struct tee_param *params = NULL;
>> +
>> + if (!ctx->teedev->desc->ops->object_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_object_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->object_invoke_func(ctx, &arg, params);
>> + if (rc)
>> + goto out;
>> +
>> + if (put_user(arg.ret, &uarg->ret)) {
>> + 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)
>> {
>> @@ -676,6 +748,12 @@ static int params_to_supp(struct tee_context *ctx,
>> ip.b = p->u.ubuf.size;
>> ip.c = 0;
>> break;
>> + case TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_INPUT:
>> + case TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_INOUT:
>> + ip.a = p->u.objref.id;
>> + ip.b = p->u.objref.flags;
>> + ip.c = 0;
>> + 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:
>> @@ -783,6 +861,11 @@ static int params_from_supp(struct tee_param *params, size_t num_params,
>> p->u.ubuf.uaddr = u64_to_user_ptr(ip.a);
>> p->u.ubuf.size = ip.b;
>> break;
>> + case TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_OUTPUT:
>> + case TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_INOUT:
>> + p->u.objref.id = ip.a;
>> + p->u.objref.flags = ip.b;
>> + break;
>> case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
>> case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
>> /*
>> @@ -863,6 +946,8 @@ static long tee_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
>> return tee_ioctl_open_session(ctx, uarg);
>> case TEE_IOC_INVOKE:
>> return tee_ioctl_invoke(ctx, uarg);
>> + case TEE_IOC_OBJECT_INVOKE:
>> + return tee_ioctl_object_invoke(ctx, uarg);
>> case TEE_IOC_CANCEL:
>> return tee_ioctl_cancel(ctx, uarg);
>> case TEE_IOC_CLOSE_SESSION:
>> diff --git a/include/linux/tee_core.h b/include/linux/tee_core.h
>> index 8a4c9e30b652..ffb04c946c70 100644
>> --- a/include/linux/tee_core.h
>> +++ b/include/linux/tee_core.h
>> @@ -72,6 +72,7 @@ struct tee_device {
>> * @close_session: close a session
>> * @system_session: declare session as a system session
>> * @invoke_func: invoke a trusted function
>> + * @object_invoke_func: invoke an object
>
> invoke a TEE object?

I'll update.

>
>> * @cancel_req: request cancel of an ongoing invoke or open
>> * @supp_recv: called for supplicant to get a command
>> * @supp_send: called for supplicant to send a response
>> @@ -97,6 +98,9 @@ struct tee_driver_ops {
>> int (*invoke_func)(struct tee_context *ctx,
>> struct tee_ioctl_invoke_arg *arg,
>> struct tee_param *param);
>> + int (*object_invoke_func)(struct tee_context *ctx,
>> + struct tee_ioctl_object_invoke_arg *arg,
>> + struct tee_param *param);
>> int (*cancel_req)(struct tee_context *ctx, u32 cancel_id, u32 session);
>> int (*supp_recv)(struct tee_context *ctx, u32 *func, u32 *num_params,
>> struct tee_param *param);
>> diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h
>> index 130782d4d5f6..16dad7a21910 100644
>> --- a/include/linux/tee_drv.h
>> +++ b/include/linux/tee_drv.h
>> @@ -87,6 +87,11 @@ struct tee_param_ubuf {
>> size_t size;
>> };
>>
>> +struct tee_param_objref {
>> + u64 id;
>> + u64 flags;
>> +};
>> +
>> struct tee_param_value {
>> u64 a;
>> u64 b;
>> @@ -97,6 +102,7 @@ struct tee_param {
>> u64 attr;
>> union {
>> struct tee_param_memref memref;
>> + struct tee_param_objref objref;
>> struct tee_param_ubuf ubuf;
>> struct tee_param_value value;
>> } u;
>> diff --git a/include/uapi/linux/tee.h b/include/uapi/linux/tee.h
>> index 4a1dcfb4290e..0aef647d4a34 100644
>> --- a/include/uapi/linux/tee.h
>> +++ b/include/uapi/linux/tee.h
>> @@ -48,8 +48,10 @@
>> #define TEE_GEN_CAP_PRIVILEGED (1 << 1)/* Privileged device (for supplicant) */
>> #define TEE_GEN_CAP_REG_MEM (1 << 2)/* Supports registering shared memory */
>> #define TEE_GEN_CAP_MEMREF_NULL (1 << 3)/* NULL MemRef support */
>> +#define TEE_GEN_CAP_OBJREF (1 << 4)/* Supports generic object reference */
>>
>> -#define TEE_MEMREF_NULL (__u64)(-1) /* NULL MemRef Buffer */
>> +#define TEE_MEMREF_NULL ((__u64)(-1)) /* NULL MemRef Buffer */
>> +#define TEE_OBJREF_NULL ((__u64)(-1)) /* NULL ObjRef Object */
>>
>> /*
>> * TEE Implementation ID
>> @@ -158,6 +160,13 @@ struct tee_ioctl_buf_data {
>> #define TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_OUTPUT 9
>> #define TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_INOUT 10 /* input and output */
>>
>> +/*
>> + * These defines object reference parameters.
>> + */
>> +#define TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_INPUT 11
>> +#define TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_OUTPUT 12
>> +#define TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_INOUT 13
>> +
>> /*
>> * Mask for the type part of the attribute, leaves room for more types
>> */
>> @@ -195,15 +204,16 @@ struct tee_ioctl_buf_data {
>> * @attr: attributes
>> * @a: if a memref, offset into the shared memory object,
>> * else if a ubuf, address into the user buffer,
>> - * else a value parameter
>> - * @b: if a memref or ubuf, size of the buffer, else a value parameter
>> + * else if an objref, object identifier, else a value parameter
>> + * @b: if a memref or ubuf, size of the buffer,
>> + * else if objref, a flag for object, else a value parameter
>
> flags for the object?
>
>> * @c: if a memref, shared memory identifier, else a value parameter
>> *
>> * @attr & TEE_PARAM_ATTR_TYPE_MASK indicates if memref, ubuf, or value is
>> * used in the union. TEE_PARAM_ATTR_TYPE_VALUE_* indicates value,
>> - * TEE_PARAM_ATTR_TYPE_MEMREF_* indicates memref, and TEE_PARAM_ATTR_TYPE_UBUF_*
>> - * indicates ubuf. TEE_PARAM_ATTR_TYPE_NONE indicates that none of the members
>> - * are used.
>> + * TEE_PARAM_ATTR_TYPE_MEMREF_* indicates memref, TEE_PARAM_ATTR_TYPE_UBUF_*
>> + * indicates ubuf, and TEE_PARAM_ATTR_TYPE_OBJREF_* indicates objref.
>> + * TEE_PARAM_ATTR_TYPE_NONE indicates that none of the members are used.
>> *
>> * Shared memory is allocated with TEE_IOC_SHM_ALLOC which returns an
>> * identifier representing the shared memory object. A memref can reference
>> @@ -411,4 +421,23 @@ struct tee_ioctl_shm_register_data {
>> * munmap(): unmaps previously shared memory
>> */
>>
>> +/**
>> + * struct tee_ioctl_invoke_func_arg - Invokes an object in a Trusted Application.
>
> Please drop the terminating '.'.
>
> Thanks,
> Jens

Ack.

Thanks,
Amir

>
>> + * @object: [in] Object id
>> + * @op: [in] Object operation, specific to the object
>> + * @ret: [out] return value
>> + * @num_params [in] number of parameters following this struct
>> + */
>> +struct tee_ioctl_object_invoke_arg {
>> + __u64 object;
>> + __u32 op;
>> + __u32 ret;
>> + __u32 num_params;
>> + /* num_params tells the actual number of element in params */
>> + struct tee_ioctl_param params[];
>> +};
>> +
>> +#define TEE_IOC_OBJECT_INVOKE _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 10, \
>> + struct tee_ioctl_buf_data)
>> +
>> #endif /*__TEE_H*/
>>
>> --
>> 2.34.1
>>

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