Prevent duplicate input overwriting

[plotchy]

Ityfuzz uses ConstantHintedMutator and VMStateHintedMutator which apply discovered values directly to the input bytes as a mutation.

This is really nice, but has a flaw when it comes to producing many duplicated values.

Each input is mutated several times under the hood which is controlled by havoc_times (max of 10) and max_stack_pow (max of 128). So each input can be mutated ~1280 times before being executed.

Since ConstantHintedMutator and VMStateHintedMutator completely overwrite the input, all of the prior mutations are wasted. These also have a ~1/5 chance to be selected as the next mutator, so we overwrite all the mutations already performed frequently.

This PR creates a MutatorMetadata object that makes these mutators skip if the input has already had a full overwrite this cycle.

This has the immediate effect of performing much less duplicated runs.

Without PR:

• 31.6% duplicates vs 68.4% unique values

With PR

• 21.8% duplicates vs 78.2% duplicates

[fuzzland-bot]

Found: 18

Project Name	Vulnerability Found	Time Taken	Log
BIGFI_exp.txt	✅ Price Manipulation	0h-0m-12s	Log File
Shadowfi_exp.txt	❌	-1	Log File
SEAMAN_exp.txt	❌	-1	Log File
BEGO_exp.txt	✅ Fund Loss	0h-0m-31s	Log File
cftoken_exp.txt	✅ Price Manipulation	0h-0m-18s	Log File
Carrot_exp.txt	❌	-1	Log File
MBC_ZZSH_exp.txt	✅ Fund Loss	0h-0m-19s	Log File
AUR_exp.txt	❌	-1	Log File
SellToken_exp.txt	✅ Fund Loss	0h-0m-34s	Log File
ROI_exp.txt	✅ Fund Loss	0h-0m-16s	Log File
GPT_exp.txt	❌	-1	Log File
OLIFE_exp.txt	❌	-1	Log File
THB_exp.txt	✅ Fund Loss	0h-4m-47s	Log File
VerilogCTF.txt	❌‼️ Crashed	-1	Log File
CS_exp.txt	✅ Price Manipulation	0h-1m-17s	Log File
MintoFinance_exp.txt	✅ Fund Loss	0h-0m-20s	Log File
Novo_exp.txt	✅ Price Manipulation	0h-0m-57s	Log File
SELLC03_exp.txt	✅ Fund Loss	0h-1m-31s	Log File
Yyds_exp.txt	✅ Fund Loss	0h-0m-55s	Log File
DYNA_exp.txt	❌	-1	Log File
EAC_exp.txt	❌	-1	Log File
Annex_exp.txt	❌	-1	Log File
PLTD_exp.txt	✅ Price Manipulation	0h-2m-53s	Log File
ApeDAO_exp.txt	✅ Price Manipulation	0h-0m-18s	Log File
GSS_exp.txt	✅ Fund Loss	0h-0m-51s	Log File
Axioma_exp.txt	✅ Fund Loss	0h-0m-34s	Log File
RFB_exp.txt	✅ Fund Loss	0h-0m-36s	Log File
HEALTH_exp.txt	✅ Price Manipulation	0h-0m-9s	Log File

[jacob-chia]

@plotchy Thanks for your work. Once the conflicts are resolved, this PR can be merged.

[fuzzland-bot]

Found: 17

Project Name	Vulnerability Found	Time Taken	Log
BIGFI_exp.txt	✅ Price Manipulation	0h-3m-41s	Log File
Shadowfi_exp.txt	❌	-1	Log File
SEAMAN_exp.txt	✅ Fund Loss	0h-0m-21s	Log File
BEGO_exp.txt	✅ Fund Loss	0h-0m-8s	Log File
cftoken_exp.txt	✅ Price Manipulation	0h-0m-6s	Log File
Carrot_exp.txt	✅ Arbitrary Call	0h-0m-20s	Log File
MBC_ZZSH_exp.txt	❌	-1	Log File
AUR_exp.txt	❌	-1	Log File
SellToken_exp.txt	✅ Fund Loss	0h-0m-30s	Log File
ROI_exp.txt	✅ Fund Loss	0h-0m-19s	Log File
GPT_exp.txt	❌	-1	Log File
OLIFE_exp.txt	❌	-1	Log File
THB_exp.txt	❌	-1	Log File
VerilogCTF.txt	❌‼️ Crashed	-1	Log File
CS_exp.txt	✅ Price Manipulation	0h-3m-5s	Log File
MintoFinance_exp.txt	✅ Fund Loss	0h-0m-13s	Log File
Novo_exp.txt	❌	-1	Log File
SELLC03_exp.txt	✅ Fund Loss	0h-1m-3s	Log File
Yyds_exp.txt	✅ Fund Loss	0h-0m-47s	Log File
DYNA_exp.txt	❌	-1	Log File
EAC_exp.txt	❌	-1	Log File
Annex_exp.txt	❌	-1	Log File
PLTD_exp.txt	✅ Price Manipulation	0h-1m-40s	Log File
ApeDAO_exp.txt	✅ Price Manipulation	0h-0m-16s	Log File
GSS_exp.txt	✅ Fund Loss	0h-1m-2s	Log File
Axioma_exp.txt	✅ Fund Loss	0h-0m-30s	Log File
RFB_exp.txt	✅ Fund Loss	0h-0m-47s	Log File
HEALTH_exp.txt	✅ Price Manipulation	0h-0m-7s	Log File