From: Amirreza Zarrabi <amirreza.zarrabi@oss.qualcomm.com>
Date: Fri, 12 Sep 2025 04:07:46 +0000 (-0700)
Subject: tee: increase TEE_MAX_ARG_SIZE to 4096
X-Git-Tag: v6.18-rc1~145^2~3^2~4
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=bd5139306886a9626a7d794940376806eccb9547;p=thirdparty%2Fkernel%2Flinux.git

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@oss.qualcomm.com>
Tested-by: Harshal Dev <quic_hdev@quicinc.com>
Signed-off-by: Amirreza Zarrabi <amirreza.zarrabi@oss.qualcomm.com>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
---

diff --git a/include/uapi/linux/tee.h b/include/uapi/linux/tee.h
index 9abb0f2995493..a5466b503bfe4 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) */