linux-kernel - [PATCH V2] mips: Enable KCSAN

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Date:   Fri, 11 Feb 2022 17:21:42 +0100
From:   Nemanja Rakovic <nemanja.rakovic@...mia.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Nemanja Rakovic <nemanja.rakovic@...mia.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        linux-kernel@...r.kernel.org, dragan.mladjenovic@...mia.com,
        elver@...gle.com
Subject: [PATCH V2] mips: Enable KCSAN

This patch enables KCSAN for the 64-bit version. Updated rules
for the incompatible compilation units (vdso, boot/compressed).

Signed-off-by: Nemanja Rakovic <nemanja.rakovic@...mia.com>
---
 arch/mips/Kconfig                  | 1 +
 arch/mips/boot/compressed/Makefile | 1 +
 arch/mips/vdso/Makefile            | 3 +++
 3 files changed, 5 insertions(+)

Changes were tested on qemu (qemu-system-mips64el) with the
64r6el_defconfig configuration and KCSAN enabled.

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 058446f01487..651d4fe355da 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -101,6 +101,7 @@ config MIPS
 	select TRACE_IRQFLAGS_SUPPORT
 	select VIRT_TO_BUS
 	select ARCH_HAS_ELFCORE_COMPAT
+	select HAVE_ARCH_KCSAN if 64BIT
 
 config MIPS_FIXUP_BIGPHYS_ADDR
 	bool
diff --git a/arch/mips/boot/compressed/Makefile b/arch/mips/boot/compressed/Makefile
index 5a15d51e8884..6cc28173bee8 100644
--- a/arch/mips/boot/compressed/Makefile
+++ b/arch/mips/boot/compressed/Makefile
@@ -38,6 +38,7 @@ KBUILD_AFLAGS := $(KBUILD_AFLAGS) -D__ASSEMBLY__ \
 KCOV_INSTRUMENT		:= n
 GCOV_PROFILE := n
 UBSAN_SANITIZE := n
+KCSAN_SANITIZE			:= n
 
 # decompressor objects (linked with vmlinuz)
 vmlinuzobjs-y := $(obj)/head.o $(obj)/decompress.o $(obj)/string.o $(obj)/bswapsi.o
diff --git a/arch/mips/vdso/Makefile b/arch/mips/vdso/Makefile
index d65f55f67e19..f72658b3a53f 100644
--- a/arch/mips/vdso/Makefile
+++ b/arch/mips/vdso/Makefile
@@ -1,6 +1,9 @@
 # SPDX-License-Identifier: GPL-2.0
 # Objects to go into the VDSO.
 
+# Sanitizer runtimes are unavailable and cannot be linked here.
+ KCSAN_SANITIZE			:= n
+
 # Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before
 # the inclusion of generic Makefile.
 ARCH_REL_TYPE_ABS := R_MIPS_JUMP_SLOT|R_MIPS_GLOB_DAT
-- 
2.17.1