From mboxrd@z Thu Jan 1 00:00:00 1970 From: liuwenliang@huawei.com (Abbott Liu) Date: Sun, 18 Mar 2018 20:53:38 +0800 Subject: [PATCH 3/7] Disable instrumentation for some code In-Reply-To: <20180318125342.4278-1-liuwenliang@huawei.com> References: <20180318125342.4278-1-liuwenliang@huawei.com> Message-ID: <20180318125342.4278-4-liuwenliang@huawei.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Andrey Ryabinin Disable instrumentation for arch/arm/boot/compressed/* and arch/arm/vdso/* because those code won't linkd with kernel image. Disable kasan check in the function unwind_pop_register because it doesn't matter that kasan checks failed when unwind_pop_register read stack memory of task. Reviewed-by: Russell King - ARM Linux Reviewed-by: Florian Fainelli Tested-by: Florian Fainelli Signed-off-by: Abbott Liu --- arch/arm/boot/compressed/Makefile | 1 + arch/arm/kernel/unwind.c | 3 ++- arch/arm/vdso/Makefile | 2 ++ 3 files changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile index 45a6b9b..966103e 100644 --- a/arch/arm/boot/compressed/Makefile +++ b/arch/arm/boot/compressed/Makefile @@ -24,6 +24,7 @@ OBJS += hyp-stub.o endif GCOV_PROFILE := n +KASAN_SANITIZE := n # # Architecture dependencies diff --git a/arch/arm/kernel/unwind.c b/arch/arm/kernel/unwind.c index 0bee233..2e55c7d 100644 --- a/arch/arm/kernel/unwind.c +++ b/arch/arm/kernel/unwind.c @@ -249,7 +249,8 @@ static int unwind_pop_register(struct unwind_ctrl_block *ctrl, if (*vsp >= (unsigned long *)ctrl->sp_high) return -URC_FAILURE; - ctrl->vrs[reg] = *(*vsp)++; + ctrl->vrs[reg] = READ_ONCE_NOCHECK(*(*vsp)); + (*vsp)++; return URC_OK; } diff --git a/arch/arm/vdso/Makefile b/arch/arm/vdso/Makefile index bb411821..87abbb7 100644 --- a/arch/arm/vdso/Makefile +++ b/arch/arm/vdso/Makefile @@ -30,6 +30,8 @@ CFLAGS_vgettimeofday.o = -O2 # Disable gcov profiling for VDSO code GCOV_PROFILE := n +KASAN_SANITIZE := n + # Force dependency $(obj)/vdso.o : $(obj)/vdso.so -- 2.9.0