| Issue |
173205
|
| Summary |
Add support for custom mutator only in libfuzzer
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
personnumber3377
|
Hi!
Currently libfuzzer only supports using a custom mutator alongside the default mutation, however this is bad for certain types of programs which expect a highly structured input and which reject the input even if there is the smallest syntax error. I assume this code here:
```
MutationDispatcher::MutationDispatcher(Random &Rand,
const FuzzingOptions &Options)
: Rand(Rand), Options(Options) {
DefaultMutators.insert(
DefaultMutators.begin(),
{
{&MutationDispatcher::Mutate_EraseBytes, "EraseBytes"},
{&MutationDispatcher::Mutate_InsertByte, "InsertByte"},
{&MutationDispatcher::Mutate_InsertRepeatedBytes,
"InsertRepeatedBytes"},
{&MutationDispatcher::Mutate_ChangeByte, "ChangeByte"},
{&MutationDispatcher::Mutate_ChangeBit, "ChangeBit"},
{&MutationDispatcher::Mutate_ShuffleBytes, "ShuffleBytes"},
{&MutationDispatcher::Mutate_ChangeASCIIInteger, "ChangeASCIIInt"},
{&MutationDispatcher::Mutate_ChangeBinaryInteger, "ChangeBinInt"},
{&MutationDispatcher::Mutate_CopyPart, "CopyPart"},
{&MutationDispatcher::Mutate_CrossOver, "CrossOver"},
{&MutationDispatcher::Mutate_AddWordFromManualDictionary,
"ManualDict"},
{&MutationDispatcher::Mutate_AddWordFromPersistentAutoDictionary,
"PersAutoDict"},
});
if(Options.UseCmp)
DefaultMutators.push_back(
{&MutationDispatcher::Mutate_AddWordFromTORC, "CMP"});
if (EF->LLVMFuzzerCustomMutator)
Mutators.push_back({&MutationDispatcher::Mutate_Custom, "Custom"});
else
Mutators = DefaultMutators;
if (EF->LLVMFuzzerCustomCrossOver)
Mutators.push_back(
{&MutationDispatcher::Mutate_CustomCrossOver, "CustomCrossOver"});
}
```
is responsible for the selection of the mutators. A simple addition would be to add an option to only use the custom mutators.
Is this possible? I may be able to implement this myself since this seems quite simple.
Thanks in advance!
![]()
_______________________________________________
llvm-bugs mailing list
[email protected]
https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
