Build with kasan enabled

[Jimmy]

Hi, all

I am trying to build an Android kernel (branch android-msm-wahoo-4.4-pie-qpr2) with kasan&kcov enabled using android-llvm toolchain. I modified build.config to:

ARCH=arm64

BRANCH=android-msm-wahoo-4.4

CC=clang

CLANG_TRIPLE=aarch64-linux-gnu-

CROSS_COMPILE=aarch64-linux-android-

CROSS_COMPILE_ARM32=arm-linux-androideabi-

DEFCONFIG=wahoo_defconfig

EXTRA_CMDS=''

KERNEL_DIR=private/msm-google

POST_DEFCONFIG_CMDS="check_defconfig && update_kasan_config"

function update_kasan_config() {

    ${KERNEL_DIR}/scripts/config --file ${OUT_DIR}/.config \

         -e CONFIG_KASAN \

         -e CONFIG_KASAN_INLINE \

         -e CONFIG_TEST_KASAN \

         -e CONFIG_KCOV \

         -e CONFIG_SLUB \

         -e CONFIG_SLUB_DEBUG \

         -e CONFIG_SLUB_DEBUG_ON \

         -d CONFIG_SLUB_DEBUG_PANIC_ON \

         -d CONFIG_KASAN_OUTLINE \

         -d CONFIG_KERNEL_LZ4 \

         -d CONFIG_RANDOMIZE_BASE

    (cd ${OUT_DIR} && \

     make O=${OUT_DIR} $archsubarch CROSS_COMPILE=${CROSS_COMPILE} olddefconfig)

}

CLANG_PREBUILT_BIN=prebuilts-master/clang/host/linux-x86/clang-4691093/bin/

LINUX_GCC_CROSS_COMPILE_PREBUILTS_BIN=prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9/bin

LINUX_GCC_CROSS_COMPILE_ARM32_PREBUILTS_BIN=prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.9/bin

LZ4_PREBUILTS_BIN=prebuilts-master/misc/linux-x86/lz4

DTC_PREBUILTS_BIN=prebuilts-master/misc/linux-x86/dtc

LIBUFDT_PREBUILTS_BIN=prebuilts-master/misc/linux-x86/libufdt

FILES="

arch/arm64/boot/dtbo.img

arch/arm64/boot/Image.lz4-dtb

vmlinux

System.map

"

IN_KERNEL_MODULES=1

STOP_SHIP_TRACEPRINTK=1

UNSTRIPPED_MODULES="

wlan.ko

"

However, when I tried to build the kernel using build/build.sh, I got several errors as follows:

aosp-kernel/private/msm-google/drivers/misc/qcom/qdsp6v2/audio_hwacc_effects.c:538:13: error: 

      stack frame size of 2144 bytes in function 'audio_effects_compat_ioctl'

      [-Werror,-Wframe-larger-than=]

aosp-kernel/private/msm-google/drivers/media/platform/msm/camera_v2/pproc/cpp/msm_cpp.c:4018:13: error: 

      stack frame size of 3200 bytes in function 'msm_cpp_subdev_fops_compat_ioctl'

      [-Werror,-Wframe-larger-than=]

I have done some searching, but could not find the answer.

Could someone help me with this? Thanks in advance!

Best,

Jimmy

[Akshay Mhaske]

This warnings comes if the size of a function frame is larger than length byte.

It is recommended to choose 2048 as default warning threshold for 64bit architecture.

Can you please try to increase FRAME_WARN size to 2048 or larger.

CONFIG_FRAME_WARN=2048

Thanks,

Akshay

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[Jimmy]

Hi Akshay,

Thanks for your reply. I add  KBUILD_CFLAGS += -w flag in Makefile and the compilation is done. However, during the link process, I got some undefined reference errors. I also tried gcc, the building process works fine. But after I flash the new kernel into Pixel2. The touch screen does not respond. Do you have any experience building a Pixel 2 kernel with kasan&kcov enabled? Thanks!

  CC [M]  drivers/staging/qcacld-3.0/core/utils/pktlog/linux_ac.o

  CC [M]  drivers/staging/qcacld-3.0/core/utils/host_diag_log/src/host_diag_log.o

  LD [M]  drivers/staging/qcacld-3.0/wlan.o

  LD      drivers/staging/built-in.o

  LD      drivers/built-in.o

  LINK    vmlinux

  LD      vmlinux.o

  MODPOST vmlinux.o

  GEN     .version

  CHK     include/generated/compile.h

drivers/built-in.o: In function `gpiod_set_array_value_priv':

aosp-kernel/private/msm-google/drivers/gpio/gpiolib.c:1441: undefined reference to `__asan_alloca_poison'

aosp-kernel/private/msm-google/drivers/gpio/gpiolib.c:1441:(.text+0x1b708): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `__asan_alloca_poison'

aosp-kernel/private/msm-google/drivers/gpio/gpiolib.c:1442: undefined reference to `__asan_alloca_poison'

aosp-kernel/private/msm-google/drivers/gpio/gpiolib.c:1442:(.text+0x1b760): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `__asan_alloca_poison'

aosp-kernel/private/msm-google/drivers/gpio/gpiolib.c:1478: undefined reference to `__asan_allocas_unpoison'

Best, 

Jimmy

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