From: Florian Fainelli <f.fainelli@gmail.com>
To: linux-arm-kernel@lists.infradead.org
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>,
Abbott Liu <liuwenliang@huawei.com>,
Florian Fainelli <f.fainelli@gmail.com>,
bcm-kernel-feedback-list@broadcom.com, glider@google.com,
dvyukov@google.com, corbet@lwn.net, linux@armlinux.org.uk,
christoffer.dall@arm.com, marc.zyngier@arm.com, arnd@arndb.de,
nico@fluxnic.net, vladimir.murzin@arm.com, keescook@chromium.org,
jinb.park7@gmail.com, alexandre.belloni@bootlin.com,
ard.biesheuvel@linaro.org, daniel.lezcano@linaro.org,
pombredanne@nexb.com, rob@landley.net,
gregkh@linuxfoundation.org, akpm@linux-foundation.org,
mark.rutland@arm.com, catalin.marinas@arm.com,
yamada.masahiro@socionext.com, tglx@linutronix.de,
thgarnie@google.com, dhowells@redhat.com, geert@linux-m68k.org,
andre.przywara@arm.com, julien.thierry@arm.com,
drjones@redhat.com, philip@cog.systems, mhocko@suse.com,
kirill.shutemov@linux.intel.com, kasan-dev@googlegroups.com,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
kvmarm@lists.cs.columbia.edu, ryabinin.a.a@gmail.com
Subject: [PATCH v7 3/7] ARM: Disable instrumentation for some code
Date: Fri, 17 Jan 2020 14:48:35 -0800 [thread overview]
Message-ID: <20200117224839.23531-4-f.fainelli@gmail.com> (raw)
In-Reply-To: <20200117224839.23531-1-f.fainelli@gmail.com>
From: Andrey Ryabinin <aryabinin@virtuozzo.com>
Disable instrumentation for arch/arm/boot/compressed/* and
arch/arm/vdso/* because that code would not linkd with kernel image.
Disable instrumentation for arch/arm/kvm/hyp/*. See commit a6cdf1c08cbf
("kvm: arm64: Disable compiler instrumentation for hypervisor code") for
more details.
Disable instrumentation for arch/arm/mm/physaddr.c. See commit
ec6d06efb0ba ("arm64: Add support for CONFIG_DEBUG_VIRTUAL") for more
details.
Disable kasan check in the function unwind_pop_register because it does
not matter that kasan checks failed when unwind_pop_register read stack
memory of task.
Reported-by: Florian Fainelli <f.fainelli@gmail.com>
Reported-by: Marc Zyngier <marc.zyngier@arm.com>
Tested-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Abbott Liu <liuwenliang@huawei.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
arch/arm/boot/compressed/Makefile | 1 +
arch/arm/kernel/unwind.c | 6 +++++-
arch/arm/mm/Makefile | 1 +
arch/arm/vdso/Makefile | 2 ++
4 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile
index a1e883c5e5c4..83991a0447fa 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
# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
KCOV_INSTRUMENT := n
diff --git a/arch/arm/kernel/unwind.c b/arch/arm/kernel/unwind.c
index 4574e6aea0a5..f73601416f90 100644
--- a/arch/arm/kernel/unwind.c
+++ b/arch/arm/kernel/unwind.c
@@ -236,7 +236,11 @@ static int unwind_pop_register(struct unwind_ctrl_block *ctrl,
if (*vsp >= (unsigned long *)ctrl->sp_high)
return -URC_FAILURE;
- ctrl->vrs[reg] = *(*vsp)++;
+ /* Use READ_ONCE_NOCHECK here to avoid this memory access
+ * from being tracked by KASAN.
+ */
+ ctrl->vrs[reg] = READ_ONCE_NOCHECK(*(*vsp));
+ (*vsp)++;
return URC_OK;
}
diff --git a/arch/arm/mm/Makefile b/arch/arm/mm/Makefile
index 7cb1699fbfc4..432302911d6e 100644
--- a/arch/arm/mm/Makefile
+++ b/arch/arm/mm/Makefile
@@ -16,6 +16,7 @@ endif
obj-$(CONFIG_ARM_PTDUMP_CORE) += dump.o
obj-$(CONFIG_ARM_PTDUMP_DEBUGFS) += ptdump_debugfs.o
obj-$(CONFIG_MODULES) += proc-syms.o
+KASAN_SANITIZE_physaddr.o := n
obj-$(CONFIG_DEBUG_VIRTUAL) += physaddr.o
obj-$(CONFIG_ALIGNMENT_TRAP) += alignment.o
diff --git a/arch/arm/vdso/Makefile b/arch/arm/vdso/Makefile
index 0fda344beb0b..1f76a5ff6e49 100644
--- a/arch/arm/vdso/Makefile
+++ b/arch/arm/vdso/Makefile
@@ -42,6 +42,8 @@ GCOV_PROFILE := n
# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
KCOV_INSTRUMENT := n
+KASAN_SANITIZE := n
+
# Force dependency
$(obj)/vdso.o : $(obj)/vdso.so
--
2.17.1
next prev parent reply other threads:[~2020-01-17 22:51 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-17 22:48 [PATCH v7 0/7] KASan for arm Florian Fainelli
2020-01-17 22:48 ` [PATCH v7 1/7] ARM: Moved CP15 definitions from kvm_hyp.h to cp15.h Florian Fainelli
2020-01-17 22:48 ` [PATCH v7 2/7] ARM: Add TTBR operator for kasan_init Florian Fainelli
2020-01-17 22:48 ` Florian Fainelli [this message]
2020-01-17 22:48 ` [PATCH v7 4/7] ARM: Replace memory function for kasan Florian Fainelli
2020-01-17 22:48 ` [PATCH v7 5/7] ARM: Define the virtual space of KASan's shadow region Florian Fainelli
2020-01-17 22:48 ` [PATCH v7 6/7] ARM: Initialize the mapping of KASan shadow memory Florian Fainelli
2020-01-17 22:48 ` [PATCH v7 7/7] ARM: Enable KASan for ARM Florian Fainelli
2020-04-10 10:45 ` Ard Biesheuvel
2020-04-10 10:47 ` Ard Biesheuvel
2020-04-12 0:33 ` Linus Walleij
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