[move] patch arithmetic issue on net_val_reward 6.9.2 (#142)

Co-authored-by: 0o-de-lally <1364012+0o-de-lally@users.noreply.github.com>
Co-authored-by: Nonast <nakib@live.nl>
Co-authored-by: sh1hsh1nk <13179671+sm86@users.noreply.github.com>

Author: 3 people

.github/actions/build_env/action.yaml

@@ -3,7 +3,6 @@ description: initialize ubuntu environment
 runs:
   using: composite
   steps:
-
     - name: free disk space
       uses: jlumbroso/free-disk-space@main
       with:

README.md

@@ -23,4 +23,4 @@ In general, we have a light touch approach with our upstream dependencies, and o
 
 Smart Contract Devs should [start here](./docs/publishing_smart_contracts.md).
 
-Core Devs should [start here](./docs/core_devs/dev_quick_start.md).
+Core Devs should [start here](./docs/core_devs/dev_quick_start.md).

framework/libra-framework/sources/ol_sources/epoch_boundary.move

@@ -268,19 +268,21 @@ module diem_framework::epoch_boundary {
 
           // since we reserved some fees to go to the oracle miners
           // we take the NET REWARD of the validators, since it is the equivalent of what the validator would earn net of entry fee.
-          let net_val_reward = nominal_reward_to_vals - entry_fee;
-
-          if (coin::value(&all_fees) > net_val_reward) {
-            let oracle_budget = coin::extract(&mut all_fees, net_val_reward);
-            status.oracle_budget = coin::value(&oracle_budget);
-
-            let (count, amount) = oracle::epoch_boundary(root, &mut oracle_budget);
-            status.oracle_pay_count = count;
-            status.oracle_pay_amount = amount;
-            status.oracle_pay_success = (amount > 0);
-            // in case there is any dust left
-            ol_account::merge_coins(&mut all_fees, oracle_budget);
-          };
+            if (nominal_reward_to_vals > entry_fee) {
+                let net_val_reward = nominal_reward_to_vals - entry_fee;
+
+                if (coin::value(&all_fees) > net_val_reward) {
+                    let oracle_budget = coin::extract(&mut all_fees, net_val_reward);
+                    status.oracle_budget = coin::value(&oracle_budget);
+
+                    let (count, amount) = oracle::epoch_boundary(root, &mut oracle_budget);
+                    status.oracle_pay_count = count;
+                    status.oracle_pay_amount = amount;
+                    status.oracle_pay_success = (amount > 0);
+                    // in case there is any dust left
+                    ol_account::merge_coins(&mut all_fees, oracle_budget);
+                };
+            };
 
           // remainder gets burnt according to fee maker preferences
           let (b_success, b_fees) = burn::epoch_burn_fees(root, &mut all_fees);

framework/libra-framework/sources/ol_sources/grade.move

@@ -17,7 +17,8 @@ module ol_framework::grade {
     /// one validator before jailing?
     const FAILED_PROPS_THRESHOLD_PCT: u64 =20;
 
-    /// how far behind the leading validator by net proposals
+    /// percent of net proposals vs. leading val
+    /// i.e. how far behind the leading validator by net proposals
     /// should the trailing validator be allowed
     const TRAILING_VALIDATOR_THRESHOLD: u64 = 5;
 
@@ -90,7 +91,7 @@ module ol_framework::grade {
         let net = proposed - failed;
         let net_props_vs_leader= fixed_point32::create_from_rational(net,
         highest_net_props);
-        fixed_point32::multiply_u64(100, net_props_vs_leader) > FAILED_PROPS_THRESHOLD_PCT
+        fixed_point32::multiply_u64(100, net_props_vs_leader) > TRAILING_VALIDATOR_THRESHOLD
       } else { false }
     }
 }