On Mon, 22 Mar 2021 at 16:11, Jerome Forissier via OP-TEE
<op-...@lists.trustedfirmware.org> wrote:
>
> When Secure World returns, it may have changed the size attribute of the
> memory references passed as [in/out] parameters. The GlobalPlatform TEE
> Internal Core API specification does not restrict the values that this
> size can take. In particular, Secure World may increase the value to be
> larger than the size of the input buffer to indicate that it needs more.
>
> Therefore, the size check in optee_from_msg_param() is incorrect and
> needs to be removed. This fixes a number of failed test cases in the
> GlobalPlatform TEE Initial Configuratiom Test Suite v2_0_0_0-2017_06_09
> when OP-TEE is compiled without dynamic shared memory support
> (CFG_CORE_DYN_SHM=n).
>
> Suggested-by: Jens Wiklander <jens.wiklan...@linaro.org>
> Signed-off-by: Jerome Forissier <jer...@forissier.org>
> ---
> drivers/tee/optee/core.c | 10 ----------
> 1 file changed, 10 deletions(-)
>
Looks good to me.
Reviewed-by: Sumit Garg <sumit.g...@linaro.org>
-Sumit
> diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c
> index 319a1e701163..ddb8f9ecf307 100644
> --- a/drivers/tee/optee/core.c
> +++ b/drivers/tee/optee/core.c
> @@ -79,16 +79,6 @@ int optee_from_msg_param(struct tee_param *params, size_t
> num_params,
> return rc;
> p->u.memref.shm_offs = mp->u.tmem.buf_ptr - pa;
> p->u.memref.shm = shm;
> -
> - /* Check that the memref is covered by the shm object
> */
> - if (p->u.memref.size) {
> - size_t o = p->u.memref.shm_offs +
> - p->u.memref.size - 1;
> -
> - rc = tee_shm_get_pa(shm, o, NULL);
> - if (rc)
> - return rc;
> - }
> break;
> case OPTEE_MSG_ATTR_TYPE_RMEM_INPUT:
> case OPTEE_MSG_ATTR_TYPE_RMEM_OUTPUT:
> --
> 2.25.1
>
