linux-kernel - Re: [PATCH 1/3] Build target for emulate.o as a userspace binary

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Date:   Wed, 12 Jun 2019 17:19:23 +0200
From:   <samcacc@...zon.com>
To:     Alexander Graf <graf@...zon.com>, Sam Caccavale <samcacc@...zon.de>
CC:     <samcaccavale@...il.com>, <nmanthey@...zon.de>,
        <wipawel@...zon.de>, <dwmw@...zon.co.uk>, <mpohlack@...zon.de>,
        <graf@...zon.de>, <karahmed@...zon.de>,
        <andrew.cooper3@...rix.com>, <JBeulich@...e.com>,
        <pbonzini@...hat.com>, <rkrcmar@...hat.com>, <tglx@...utronix.de>,
        <mingo@...hat.com>, <bp@...en8.de>, <hpa@...or.com>,
        <paullangton4@...il.com>, <anirudhkaushik@...gle.com>,
        <x86@...nel.org>, <kvm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] Build target for emulate.o as a userspace binary

On 5/31/19 10:02 AM, Alexander Graf wrote:
> 
> 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
> 

This was supposed to be the `ifdef` actually.  Fixed in v2.

Sam