linux-kernel - [PATCH v6 05/12] tee: increase TEE_MAX_ARG

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Message-Id: <20250713-qcom-tee-using-tee-ss-without-mem-obj-v6-5-697fb7d41c36@oss.qualcomm.com>
Date: Sun, 13 Jul 2025 17:49:17 -0700
From: Amirreza Zarrabi <amirreza.zarrabi@....qualcomm.com>
To: Jens Wiklander <jens.wiklander@...aro.org>,
        Sumit Garg <sumit.garg@...nel.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>
Cc: 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,
        Amirreza Zarrabi <amirreza.zarrabi@....qualcomm.com>,
        Sumit Garg <sumit.garg@....qualcomm.com>
Subject: [PATCH v6 05/12] tee: increase TEE_MAX_ARG_SIZE to 4096

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.

Reviewed-by: Sumit Garg <sumit.garg@....qualcomm.com>
Tested-by: Harshal Dev <quic_hdev@...cinc.com>
Signed-off-by: Amirreza Zarrabi <amirreza.zarrabi@....qualcomm.com>
---
 include/uapi/linux/tee.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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