[LLVMdev] Asan: Print stacktrace on SIGFPE

[David Jones]

SIGFPE is thrown (at least on Linux x86_64) for integer divide by zero.

This sounds like a worthy target for a fuzzer.

On Fri, Jul 31, 2015 at 12:32 PM, Kostya Serebryany <kcc at google.com> wrote:

>
>
> On Fri, Jul 31, 2015 at 5:15 AM, Karl Skomski <karl at skomski.com> wrote:
>
>> Would it make sense to add the possibility to print a stacktrace also on
>> SIGFPE and not only on SIGSEGV or SIGBUS?
>>
>
> Yes, under a separate flag (handle_sigfpe=1).
> I think it's fine to have this flag on by default.
> Would you like to contribute a patch?
>
>
>> Only noticed that LibFuzzer doesn't generate any crash report because
>> asan is not handling the signal.
>>
>
> Makes sense. The sanitizers (except maybe a bit of ubsan) typically don't
> deal with floating point errors,
> so no one cared about SIGFPE. But libFuzzer may discover some of those
> errors.
>
> --kcc
>
>
>>
>> Kind regards,
>>
>> Karl Skomski
>>
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>>
>
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