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SubjectRe: [PATCH 1/3] Build target for emulate.o as a userspace binary
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On 21.05.19 17:39, Sam Caccavale wrote:
> This commit contains the minimal set of functionality to build
> afl-harness around arch/x86/emulate.c which allows exercising code
> in that source file, like x86_emulate_insn. Resolving the
> dependencies was done via GCC's -H flag by get_headers.py.
>
> ---
> tools/Makefile | 9 ++
> .../fuzz/x86_instruction_emulation/.gitignore | 2 +
> tools/fuzz/x86_instruction_emulation/Makefile | 57 +++++++
> .../fuzz/x86_instruction_emulation/README.md | 12 ++
> .../x86_instruction_emulation/afl-harness.c | 149 ++++++++++++++++++
> tools/fuzz/x86_instruction_emulation/common.h | 87 ++++++++++
> .../x86_instruction_emulation/emulator_ops.c | 58 +++++++
> .../x86_instruction_emulation/emulator_ops.h | 117 ++++++++++++++
> .../scripts/get_headers.py | 95 +++++++++++
> .../scripts/make_deps | 4 +
> tools/fuzz/x86_instruction_emulation/stubs.c | 56 +++++++
> tools/fuzz/x86_instruction_emulation/stubs.h | 52 ++++++
> 12 files changed, 698 insertions(+)
> create mode 100644 tools/fuzz/x86_instruction_emulation/.gitignore
> create mode 100644 tools/fuzz/x86_instruction_emulation/Makefile
> create mode 100644 tools/fuzz/x86_instruction_emulation/README.md
> create mode 100644 tools/fuzz/x86_instruction_emulation/afl-harness.c
> create mode 100644 tools/fuzz/x86_instruction_emulation/common.h
> create mode 100644 tools/fuzz/x86_instruction_emulation/emulator_ops.c
> create mode 100644 tools/fuzz/x86_instruction_emulation/emulator_ops.h
> create mode 100644 tools/fuzz/x86_instruction_emulation/scripts/get_headers.py
> create mode 100755 tools/fuzz/x86_instruction_emulation/scripts/make_deps
> create mode 100644 tools/fuzz/x86_instruction_emulation/stubs.c
> create mode 100644 tools/fuzz/x86_instruction_emulation/stubs.h
>
> diff --git a/tools/Makefile b/tools/Makefile
> index 3dfd72ae6c1a..4d68817b7e49 100644
> --- a/tools/Makefile
> +++ b/tools/Makefile
> @@ -94,6 +94,12 @@ freefall: FORCE
> kvm_stat: FORCE
> $(call descend,kvm/$@)
>
> +fuzz: FORCE
> + $(call descend,fuzz/x86_instruction_emulation)
> +
> +fuzz_deps: FORCE
> + $(call descend,fuzz/x86_instruction_emulation,fuzz_deps)
> +
> all: acpi cgroup cpupower gpio hv firewire liblockdep \
> perf selftests spi turbostat usb \
> virtio vm bpf x86_energy_perf_policy \
> @@ -171,6 +177,9 @@ tmon_clean:
> freefall_clean:
> $(call descend,laptop/freefall,clean)
>
> +fuzz_clean:
> + $(call descend,fuzz/x86_instruction_emulation,clean)
> +
> build_clean:
> $(call descend,build,clean)
>
> diff --git a/tools/fuzz/x86_instruction_emulation/.gitignore b/tools/fuzz/x86_instruction_emulation/.gitignore
> new file mode 100644
> index 000000000000..7d44f7ce266e
> --- /dev/null
> +++ b/tools/fuzz/x86_instruction_emulation/.gitignore
> @@ -0,0 +1,2 @@
> +*.o
> +*-harness
> diff --git a/tools/fuzz/x86_instruction_emulation/Makefile b/tools/fuzz/x86_instruction_emulation/Makefile
> new file mode 100644
> index 000000000000..d2854a332605
> --- /dev/null
> +++ b/tools/fuzz/x86_instruction_emulation/Makefile
> @@ -0,0 +1,57 @@
> +ROOT_DIR=../../..
> +THIS_DIR=tools/fuzz/x86_instruction_emulation
> +
> +include ../../scripts/Makefile.include
> +
> +.DEFAULT_GOAL := all
> +
> +INCLUDES := $(patsubst -I./%,-I./$(ROOT_DIR)/%, $(LINUXINCLUDE))
> +INCLUDES := $(patsubst ./include/%,./$(ROOT_DIR)/include/%, $(INCLUDES))
> +INCLUDES += -include ./$(ROOT_DIR)/include/linux/compiler_types.h
> +
> +$(ROOT_DIR)/.config:
> + make -C $(ROOT_DIR) menuconfig
> + sed -i -r 's/^#? *CONFIG_KVM(.*)=.*/CONFIG_KVM\1=y/' $(ROOT_DIR)/.config
> +
> +
> +ifdef DEBUG
> +KBUILD_CFLAGS += -DDEBUG
> +endif
> +KBUILD_CFLAGS += -g -O0


Why -O0? I would expect a some bugs to only emerge with optimization
enabled.

Alex

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