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chore(certora): add rule that cancelled requests stay cancelled and finished requests stay finished

This commit is contained in:
r4bbit 2024-08-21 21:30:20 +02:00
parent 09ca8481fb
commit 7dc26ccc47
1 changed files with 30 additions and 4 deletions
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34
certora/specs/Marketplace.spec
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@ -272,16 +272,42 @@ rule functionsCausingRequestStateChanges(env e, method f) {
// RequestState.Started -> RequestState.Failed
assert requestStateBefore == Marketplace.RequestState.Started && requestStateAfter == Marketplace.RequestState.Failed => canFailRequest(f);
// RequestState.New -> RequestState.Cancelled
assert requestStateBefore == Marketplace.RequestState.New && requestStateAfter == Marketplace.RequestState.Cancelled => canCancelRequest(f);
}
rule finishedRequestCannotBeStartedAgain(env e, method f) {
rule cancelledRequestsStayCancelled(env e, method f) {
calldataarg args;
Marketplace.RequestId requestId;
Marketplace.RequestState requestStateBefore = currentContract.requestState(e, requestId);
require requestStateBefore == Marketplace.RequestState.Cancelled;
requireInvariant cancelledRequestAlwaysExpired(e, requestId);
f(e, args);
Marketplace.RequestState requestStateAfter = currentContract.requestState(e, requestId);
assert requestStateAfter == requestStateBefore;
}
rule finishedRequestsStayFinished(env e, method f) {
calldataarg args;
Marketplace.RequestId requestId;
// Without this, the prover will find counter examples with `requestId == 0`,
// which are unlikely in practice as `requestId` is a hash from a request object.
// However, `requestId == 0` enforces `SlotState.Free` in the `fillSlot` function regardless,
// which ultimately results in counter examples where we have a state change
// RequestState.Finished -> RequestState.Started, which is forbidden.
//
// COUNTER EXAMPLE: https://prover.certora.com/output/6199/81939b2b12d74a5cae5e84ceadb901c0?anonymousKey=a4ad6268598a1077ecfce75493b0c0f9bc3b17a0
//
// The `require` below is a hack to ensure we exclude such cases as the code
// reverts in `requestIsKnown()` modifier (simply `require requestId != 0` isn't
// sufficient here)
require requestId == to_bytes32(0) => currentContract._requests[requestId].client == 0;
Marketplace.RequestState requestStateBefore = currentContract.requestState(e, requestId);
require requestStateBefore == Marketplace.RequestState.Finished;
f(e, args);