linux-hardening - [PATCH] LoongArch: vDSO: Disable UBSAN instrumentation

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Date: Tue, 30 Jan 2024 15:31:40 -0800
From: Kees Cook <keescook@...omium.org>
To: Huacai Chen <chenhuacai@...nel.org>
Cc: Kees Cook <keescook@...omium.org>,
	kernel test robot <lkp@...el.com>,
	WANG Xuerui <kernel@...0n.name>,
	Vincenzo Frascino <vincenzo.frascino@....com>,
	Nathan Chancellor <nathan@...nel.org>,
	Masahiro Yamada <masahiroy@...nel.org>,
	Fangrui Song <maskray@...gle.com>,
	loongarch@...ts.linux.dev,
	Thomas Gleixner <tglx@...utronix.de>,
	Qing Zhang <zhangqing@...ngson.cn>,
	Feiyang Chen <chenfeiyang@...ngson.cn>,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH] LoongArch: vDSO: Disable UBSAN instrumentation

The vDSO executes in userspace, so the kernel's UBSAN should not
instrument it. Solves these kind of build errors:

  loongarch64-linux-ld: arch/loongarch/vdso/vgettimeofday.o: in function `vdso_shift_ns':
  lib/vdso/gettimeofday.c:23:(.text+0x3f8): undefined reference to `__ubsan_handle_shift_out_of_bounds'

Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202401310530.lZHCj1Zl-lkp@intel.com/
Cc: Huacai Chen <chenhuacai@...nel.org>
Cc: WANG Xuerui <kernel@...0n.name>
Cc: Vincenzo Frascino <vincenzo.frascino@....com>
Cc: Nathan Chancellor <nathan@...nel.org>
Cc: Masahiro Yamada <masahiroy@...nel.org>
Cc: Fangrui Song <maskray@...gle.com>
Cc: loongarch@...ts.linux.dev
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 arch/loongarch/vdso/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/loongarch/vdso/Makefile b/arch/loongarch/vdso/Makefile
index c74c9921304f..f597cd08a96b 100644
--- a/arch/loongarch/vdso/Makefile
+++ b/arch/loongarch/vdso/Makefile
@@ -2,6 +2,7 @@
 # Objects to go into the VDSO.
 
 KASAN_SANITIZE := n
+UBSAN_SANITIZE := n
 KCOV_INSTRUMENT := n
 
 # Include the generic Makefile to check the built vdso.
-- 
2.34.1