linux-kernel - [PATCH] ARM: export __memset/__memcpy/_

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Message-Id: <20250620111257.3365489-1-arnd@kernel.org>
Date: Fri, 20 Jun 2025 13:12:44 +0200
From: Arnd Bergmann <arnd@...nel.org>
To: Russell King <linux@...linux.org.uk>
Cc: Arnd Bergmann <arnd@...db.de>,
	Abbott Liu <liuwenliang@...wei.com>,
	Ard Biesheuvel <ardb@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Florian Fainelli <f.fainelli@...il.com>,
	Ahmad Fatoum <a.fatoum@...gutronix.de>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] ARM: export __memset/__memcpy/__memmove

From: Arnd Bergmann <arnd@...db.de>

When KASAN is locally disabled for one file, the string functions
get redirected to internal helpers, but those are not actually exported,
so this only works in built-in code but fails for loadable modules:

ERROR: modpost: "__memset" [crypto/ecc.ko] undefined!
ERROR: modpost: "__memcpy" [crypto/ecc.ko] undefined!

Add the missig exports.

Fixes: d6d51a96c7d6 ("ARM: 9014/2: Replace string mem* functions for KASan")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 arch/arm/kernel/armksyms.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm/kernel/armksyms.c b/arch/arm/kernel/armksyms.c
index 82e96ac83684..1ff50106afa4 100644
--- a/arch/arm/kernel/armksyms.c
+++ b/arch/arm/kernel/armksyms.c
@@ -83,10 +83,13 @@ EXPORT_SYMBOL(__raw_writesl);
 EXPORT_SYMBOL(strchr);
 EXPORT_SYMBOL(strrchr);
 EXPORT_SYMBOL(memset);
+EXPORT_SYMBOL(__memset);
 EXPORT_SYMBOL(__memset32);
 EXPORT_SYMBOL(__memset64);
 EXPORT_SYMBOL(memcpy);
+EXPORT_SYMBOL(__memcpy);
 EXPORT_SYMBOL(memmove);
+EXPORT_SYMBOL(__memmove);
 EXPORT_SYMBOL(memchr);
 
 EXPORT_SYMBOL(mmioset);
-- 
2.39.5