linux-kernel - [PATCH AUTOSEL 6.1 31/52] sparc: vdso: Disable UBSAN instrumentation

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Date: Fri, 29 Mar 2024 08:45:25 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Kees Cook <keescook@...omium.org>,
	Sam Ravnborg <sam@...nborg.org>,
	Sasha Levin <sashal@...nel.org>,
	davem@...emloft.net,
	andreas@...sler.com,
	masahiroy@...nel.org,
	nicolas@...sle.eu,
	rmk+kernel@...linux.org.uk,
	sparclinux@...r.kernel.org
Subject: [PATCH AUTOSEL 6.1 31/52] sparc: vdso: Disable UBSAN instrumentation

From: Kees Cook <keescook@...omium.org>

[ Upstream commit d4be85d068b4418c341f79b654399f7f0891069a ]

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'

Acked-by: Sam Ravnborg <sam@...nborg.org>
Link: https://lore.kernel.org/all/20240224073617.GA2959352@ravnborg.org
Signed-off-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/sparc/vdso/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/sparc/vdso/Makefile b/arch/sparc/vdso/Makefile
index 77d7b9032158c..cb046b9d1eddc 100644
--- a/arch/sparc/vdso/Makefile
+++ b/arch/sparc/vdso/Makefile
@@ -2,6 +2,7 @@
 #
 # Building vDSO images for sparc.
 #
+UBSAN_SANITIZE := n
 
 VDSO64-$(CONFIG_SPARC64)	:= y
 VDSOCOMPAT-$(CONFIG_COMPAT)	:= y
-- 
2.43.0