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Re: [PATCH v2 1/2] Add libfuzzer target to fuzz/x86_instruction_emulator
- To: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 22 Jul 2024 13:05:45 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Anthony PERARD <anthony@xxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 22 Jul 2024 11:05:51 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 22.07.2024 13:03, Tamas K Lengyel wrote:
> On Mon, Jul 22, 2024 at 5:20 AM Jan Beulich <jbeulich@xxxxxxxx> wrote:
>>
>> On 26.06.2024 00:47, Tamas K Lengyel wrote:
>>> This target enables integration into oss-fuzz. Changing invalid input return
>>> to -1 as values other then 0/-1 are reserved by libfuzzer. Also adding the
>>> missing __wrap_vsnprintf wrapper which is required for successful oss-fuzz
>>> build.
>>>
>>> Signed-off-by: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>
>>
>> I've reverted this right away, because of ...
>>
>>> @@ -58,6 +58,9 @@ afl-harness: afl-harness.o $(OBJS) cpuid.o wrappers.o
>>> afl-harness-cov: afl-harness-cov.o $(patsubst %.o,%-cov.o,$(OBJS)) cpuid.o
>>> wrappers.o
>>> $(CC) $(CFLAGS) $(GCOV_FLAGS) $(addprefix
>>> -Wl$(comma)--wrap=,$(WRAPPED)) $^ -o $@
>>>
>>> +libfuzzer-harness: $(OBJS) cpuid.o wrappers.o
>>> + $(CC) $(CFLAGS) $(LIB_FUZZING_ENGINE) -fsanitize=fuzzer $(addprefix
>>> -Wl$(comma)--wrap=,$(WRAPPED)) $^ -o $@
>>
>> ... this causing
>>
>> gcc: error: unrecognized argument to '-fsanitize=' option: 'fuzzer'
>> make[6]: *** [Makefile:62: libfuzzer-harness] Error 1
>>
>> with apparently a fair set of gcc-s used by distro-s we use for CI.
>
> Well let me see if I can hack the Makefile to only build this with clang..
And perhaps a new enough version thereof? Or has the option been around there
forever?
Jan
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