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automergerpr-permission-manager merged 1 commit into from
Jan 16, 2026
Merged

feat(spl): cheatcode for multisig #910

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73 changes: 73 additions & 0 deletions kmir/src/kmir/kdist/mir-semantics/symbolic/spl-token.md
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Original file line number Diff line number Diff line change
Expand Up @@ -130,6 +130,9 @@ module KMIR-SPL-TOKEN
// spl-token rent
rule #isSPLUnpackFunc("bincode::deserialize::<'_, solana_rent::Rent>") => true
rule #isSPLUnpackFunc("Rent::unpack") => true
// spl-token multisig
rule #isSPLUnpackFunc("<state::Multisig as solana_program_pack::Pack>::unpack_from_slice") => true
rule #isSPLUnpackFunc("Multisig::unpack_from_slice") => true

syntax Bool ::= #isSPLPackFunc ( String ) [function, total]
rule #isSPLPackFunc(_) => false [owise]
Expand All @@ -139,6 +142,9 @@ module KMIR-SPL-TOKEN
// spl-token mint
rule #isSPLPackFunc("<state::Mint as solana_program_pack::Pack>::pack_into_slice") => true
rule #isSPLPackFunc("Mint::pack_into_slice") => true
// spl-token multisig
rule #isSPLPackFunc("<state::Multisig as solana_program_pack::Pack>::pack_into_slice") => true
rule #isSPLPackFunc("Multisig::pack_into_slice") => true

syntax Bool ::= #isSPLRentGetFunc ( String ) [function, total]
rule #isSPLRentGetFunc(_) => false [owise]
Expand Down Expand Up @@ -198,6 +204,25 @@ module KMIR-SPL-TOKEN
)
=> dynamicSize(17)
[priority(30)]

// Multisig data buffer length (Multisig::LEN = 355)
rule #maybeDynamicSize(
dynamicSize(_),
SPLDataBuffer(
Aggregate(variantIdx(0),
ListItem(Integer(_, 8, false)) // m
ListItem(Integer(_, 8, false)) // n
ListItem(BoolVal(_)) // is_initialized
ListItem(Range( // signers: [Pubkey; 11]
ListItem(_) ListItem(_) ListItem(_) ListItem(_) ListItem(_)
ListItem(_) ListItem(_) ListItem(_) ListItem(_) ListItem(_)
ListItem(_)
))
)
)
)
=> dynamicSize(355)
[priority(30)]
```

## Cheatcode handling
Expand Down Expand Up @@ -409,6 +434,54 @@ The `#initBorrow` helper resets borrow counters to 0 and sets the correct dynami
ensures 0 <=Int ?SplRentLamportsPerByteYear andBool ?SplRentLamportsPerByteYear <Int (1 <<Int 32)
andBool 0 <=Int ?SplRentBurnPercent andBool ?SplRentBurnPercent <=Int 100
[priority(30), preserves-definedness]

rule [cheatcode-is-spl-multisig]:
<k> #execTerminatorCall(_, FUNC, operandCopy(place(LOCAL, PROJS)) .Operands, _DEST, TARGET, _UNWIND) ~> _CONT
=> #forceSetPlaceValue(
place(LOCAL, appendP(PROJS, DATA_BUFFER_PROJS)), // navigate to [u8] data buffer
SPLDataBuffer(
Aggregate(variantIdx(0),
ListItem(Integer(?SplMultisigM:Int, 8, false)) // m: u8
ListItem(Integer(?SplMultisigN:Int, 8, false)) // n: u8
ListItem(BoolVal(?_SplMultisigInitialised:Bool)) // is_initialized: bool
ListItem(Range( // signers: [Pubkey; 11]
ListItem(?SplSigner0:List)
ListItem(?SplSigner1:List)
ListItem(?SplSigner2:List)
ListItem(?SplSigner3:List)
ListItem(?SplSigner4:List)
ListItem(?SplSigner5:List)
ListItem(?SplSigner6:List)
ListItem(?SplSigner7:List)
ListItem(?SplSigner8:List)
ListItem(?SplSigner9:List)
ListItem(?SplSigner10:List)
))
)
)
)
~> #forceSetPlaceValue(
place(LOCAL, appendP(PROJS, REFCELL_PROJS)), // navigate to RefCell for borrow init
#initBorrow(operandCopy(place(LOCAL, appendP(PROJS, REFCELL_PROJS))), 355)
)
~> #continueAt(TARGET)
</k>
requires #functionName(FUNC) ==String "spl_token::entrypoint::cheatcode_is_spl_multisig"
orBool #functionName(FUNC) ==String "cheatcode_is_spl_multisig"
ensures 0 <=Int ?SplMultisigM andBool ?SplMultisigM <Int 256
andBool 0 <=Int ?SplMultisigN andBool ?SplMultisigN <Int 256
andBool #isSplPubkey(?SplSigner0)
andBool #isSplPubkey(?SplSigner1)
andBool #isSplPubkey(?SplSigner2)
andBool #isSplPubkey(?SplSigner3)
andBool #isSplPubkey(?SplSigner4)
andBool #isSplPubkey(?SplSigner5)
andBool #isSplPubkey(?SplSigner6)
andBool #isSplPubkey(?SplSigner7)
andBool #isSplPubkey(?SplSigner8)
andBool #isSplPubkey(?SplSigner9)
andBool #isSplPubkey(?SplSigner10)
[priority(30), preserves-definedness]
```

## RefCell borrow helpers
Expand Down