linux-kernel - [PATCH 1/5] ARC: uapi: Stop leaking CONFIG_ARC_HAS

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Message-Id: <20251230-headers_install-config-leak-v1-1-efba5c58073d@linutronix.de>
Date: Tue, 30 Dec 2025 08:10:56 +0100
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Vineet Gupta <vgupta@...nel.org>, Russell King <linux@...linux.org.uk>, 
 Dinh Nguyen <dinguyen@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, 
 Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
 Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, 
 "H. Peter Anvin" <hpa@...or.com>
Cc: linux-snps-arc@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, Arnd Bergmann <arnd@...db.de>, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH 1/5] ARC: uapi: Stop leaking CONFIG_ARC_HAS_SWAPE reference
 to userspace

UAPI headers are not supposed to leak references to kconfig symbols.
These won't be set when building userspace. Hide the kconfig reference
behind 'if defined(__KERNEL__)', so it will be stripped by
headers_install.sh. The result for userspace will be the same, but the
exception in headers_install.sh can also be removed.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
 arch/arc/include/uapi/asm/swab.h | 2 +-
 scripts/headers_install.sh       | 1 -
 2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/arc/include/uapi/asm/swab.h b/arch/arc/include/uapi/asm/swab.h
index 8d1f1ef44ba7..b2cede1b74b9 100644
--- a/arch/arc/include/uapi/asm/swab.h
+++ b/arch/arc/include/uapi/asm/swab.h
@@ -20,7 +20,7 @@
 #include <linux/types.h>

 /* Native single cycle endian swap insn */
-#ifdef CONFIG_ARC_HAS_SWAPE
+#if defined(__KERNEL__) && defined(CONFIG_ARC_HAS_SWAPE)

 #define __arch_swab32(x)		\
 ({					\
diff --git a/scripts/headers_install.sh b/scripts/headers_install.sh
index 0e4e939efc94..727f7f82c2c7 100755
--- a/scripts/headers_install.sh
+++ b/scripts/headers_install.sh
@@ -70,7 +70,6 @@ configs=$(sed -e '
 #
 # The format is <file-name>:<CONFIG-option> in each line.
 config_leak_ignores="
-arch/arc/include/uapi/asm/swab.h:CONFIG_ARC_HAS_SWAPE
 arch/arm/include/uapi/asm/ptrace.h:CONFIG_CPU_ENDIAN_BE8
 arch/nios2/include/uapi/asm/swab.h:CONFIG_NIOS2_CI_SWAB_NO
 arch/nios2/include/uapi/asm/swab.h:CONFIG_NIOS2_CI_SWAB_SUPPORT

-- 
2.52.0