linux-kernel - Re: [PATCH v5 05/12] tee: increase TEE_MAX_ARG

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Message-ID: <aEl-c-eoezGYKOpE@sumit-X1>
Date: Wed, 11 Jun 2025 18:32:43 +0530
From: Sumit Garg <sumit.garg@...nel.org>
To: Amirreza Zarrabi <amirreza.zarrabi@....qualcomm.com>
Cc: Jens Wiklander <jens.wiklander@...aro.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
	Apurupa Pattapu <quic_apurupa@...cinc.com>,
	Kees Cook <kees@...nel.org>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Christian König <christian.koenig@....com>,
	Harshal Dev <quic_hdev@...cinc.com>, linux-arm-msm@...r.kernel.org,
	op-tee@...ts.trustedfirmware.org, linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	linaro-mm-sig@...ts.linaro.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH v5 05/12] tee: increase TEE_MAX_ARG_SIZE to 4096

On Mon, May 26, 2025 at 11:56:50PM -0700, Amirreza Zarrabi wrote:
> Increase TEE_MAX_ARG_SIZE to accommodate worst-case scenarios where
> additional buffer space is required to pass all arguments to TEE.
> This change is necessary for upcoming support for Qualcomm TEE, which
> requires a larger buffer for argument marshaling.
> 
> Signed-off-by: Amirreza Zarrabi <amirreza.zarrabi@....qualcomm.com>
> ---
>  include/uapi/linux/tee.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Reviewed-by: Sumit Garg <sumit.garg@....qualcomm.com>

-Sumit

> 
> diff --git a/include/uapi/linux/tee.h b/include/uapi/linux/tee.h
> index 441d97add53f..71a365afb89b 100644
> --- a/include/uapi/linux/tee.h
> +++ b/include/uapi/linux/tee.h
> @@ -42,7 +42,7 @@
>  #define TEE_IOC_MAGIC	0xa4
>  #define TEE_IOC_BASE	0
>  
> -#define TEE_MAX_ARG_SIZE	1024
> +#define TEE_MAX_ARG_SIZE	4096
>  
>  #define TEE_GEN_CAP_GP		(1 << 0)/* GlobalPlatform compliant TEE */
>  #define TEE_GEN_CAP_PRIVILEGED	(1 << 1)/* Privileged device (for supplicant) */
> 
> -- 
> 2.34.1
> 
>