linux-kernel - [PATCH 03/13] powerpc: Disable KMSAN santitization for prom

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Message-Id: <20231214055539.9420-4-nicholas@linux.ibm.com>
Date:   Thu, 14 Dec 2023 05:55:29 +0000
From:   Nicholas Miehlbradt <nicholas@...ux.ibm.com>
To:     glider@...gle.com, elver@...gle.com, dvyukov@...gle.com,
        akpm@...ux-foundation.org, mpe@...erman.id.au, npiggin@...il.com,
        christophe.leroy@...roup.eu
Cc:     linux-mm@...ck.org, kasan-dev@...glegroups.com, iii@...ux.ibm.com,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Nicholas Miehlbradt <nicholas@...ux.ibm.com>
Subject: [PATCH 03/13] powerpc: Disable KMSAN santitization for prom_init, vdso and purgatory

Other sanitizers are disabled for these, disable KMSAN too.

prom_init.o can only reference a limited set of external symbols. KMSAN
adds additional references which are not permitted so disable
sanitization.

Signed-off-by: Nicholas Miehlbradt <nicholas@...ux.ibm.com>
---
 arch/powerpc/kernel/Makefile      | 2 ++
 arch/powerpc/kernel/vdso/Makefile | 1 +
 arch/powerpc/purgatory/Makefile   | 1 +
 3 files changed, 4 insertions(+)

diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index 2919433be355..78ea441f7e18 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -61,6 +61,8 @@ KCSAN_SANITIZE_btext.o := n
 KCSAN_SANITIZE_paca.o := n
 KCSAN_SANITIZE_setup_64.o := n
 
+KMSAN_SANITIZE_prom_init.o := n
+
 #ifdef CONFIG_RANDOMIZE_KSTACK_OFFSET
 # Remove stack protector to avoid triggering unneeded stack canary
 # checks due to randomize_kstack_offset.
diff --git a/arch/powerpc/kernel/vdso/Makefile b/arch/powerpc/kernel/vdso/Makefile
index 0c7d82c270c3..86fa6ff1ee51 100644
--- a/arch/powerpc/kernel/vdso/Makefile
+++ b/arch/powerpc/kernel/vdso/Makefile
@@ -52,6 +52,7 @@ KCOV_INSTRUMENT := n
 UBSAN_SANITIZE := n
 KASAN_SANITIZE := n
 KCSAN_SANITIZE := n
+KMSAN_SANITIZE := n
 
 ccflags-y := -fno-common -fno-builtin
 ldflags-y := -Wl,--hash-style=both -nostdlib -shared -z noexecstack $(CLANG_FLAGS)
diff --git a/arch/powerpc/purgatory/Makefile b/arch/powerpc/purgatory/Makefile
index 78473d69cd2b..4b267061bf84 100644
--- a/arch/powerpc/purgatory/Makefile
+++ b/arch/powerpc/purgatory/Makefile
@@ -2,6 +2,7 @@
 
 KASAN_SANITIZE := n
 KCSAN_SANITIZE := n
+KMSAN_SANITIZE := n
 
 targets += trampoline_$(BITS).o purgatory.ro
 
-- 
2.40.1