linux-hardening - [PATCH] sparc: vdso: Disable UBSAN instrumentation

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Date: Fri, 23 Feb 2024 08:59:45 -0800
From: Kees Cook <keescook@...omium.org>
To: "David S. Miller" <davem@...emloft.net>
Cc: Kees Cook <keescook@...omium.org>,
	Andreas Larsson <andreas@...sler.com>,
	Masahiro Yamada <masahiroy@...nel.org>,
	Sam Ravnborg <sam@...nborg.org>,
	Helge Deller <deller@....de>,
	Guo Ren <guoren@...nel.org>,
	sparclinux@...r.kernel.org,
	Catalin Marinas <catalin.marinas@....com>,
	"Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH] sparc: vdso: Disable UBSAN instrumentation

The UBSAN instrumentation cannot work in the vDSO since it is executing
in userspace, so disable it in the Makefile. Fixes the build failures
such as:

arch/sparc/vdso/vclock_gettime.c:217: undefined reference to `__ubsan_handle_shift_out_of_bounds'

Signed-off-by: Kees Cook <keescook@...omium.org>
---
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Andreas Larsson <andreas@...sler.com>
Cc: Masahiro Yamada <masahiroy@...nel.org>
Cc: Sam Ravnborg <sam@...nborg.org>
Cc: Helge Deller <deller@....de>
Cc: Guo Ren <guoren@...nel.org>
Cc: sparclinux@...r.kernel.org
---
 arch/sparc/vdso/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/sparc/vdso/Makefile b/arch/sparc/vdso/Makefile
index 7f5eedf1f5e0..e8aef2c8ae99 100644
--- a/arch/sparc/vdso/Makefile
+++ b/arch/sparc/vdso/Makefile
@@ -2,6 +2,7 @@
 #
 # Building vDSO images for sparc.
 #
+UBSAN_SANITIZE := n
 
 # files to link into the vdso
 vobjs-y := vdso-note.o vclock_gettime.o
-- 
2.34.1