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R4R: Fix Invalid Cliff Validator Power Comparison #2077

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merged 3 commits into from
Aug 17, 2018
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R4R: Fix Invalid Cliff Validator Power Comparison #2077

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ac84f20
Fix invalid power check updateCliffValidator and add defensive panic
Aug 17, 2018
9864209
Update PENDING log
Aug 17, 2018
a2cca2c
Pending -> Changelog
cwgoes Aug 17, 2018
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1 change: 1 addition & 0 deletions CHANGELOG.md
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Original file line number Diff line number Diff line change
Expand Up @@ -103,6 +103,7 @@ BUG FIXES
- [x/stake] \#2021 Fixed repeated CLI commands in staking

* Gaia
- [x/stake] [#2077](https://github.com/cosmos/cosmos-sdk/pull/2077) Fixed invalid cliff power comparison
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We shouldn't need to put the links in the pending file I don't think

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Ok -- I'll stop doing that.

- \#1804 Fixes gen-tx genesis generation logic temporarily until upstream updates
- \#1799 Fix `gaiad export`
- \#1839 Fixed bug where intra-tx counter wasn't set correctly for genesis validators
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19 changes: 9 additions & 10 deletions x/stake/keeper/validator.go
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Expand Up @@ -280,10 +280,6 @@ func (k Keeper) updateCliffValidator(ctx sdk.Context, affectedVal types.Validato
panic(fmt.Sprintf("cliff validator record not found for address: %v\n", cliffAddr))
}

// NOTE: We get the power via affectedVal since the store (by power key)
// has yet to be updated.
affectedValPower := affectedVal.GetPower()

// Create a validator iterator ranging from smallest to largest by power
// starting the current cliff validator's power.
start := GetValidatorsByPowerIndexKey(oldCliffVal, pool)
Expand All @@ -307,16 +303,19 @@ func (k Keeper) updateCliffValidator(ctx sdk.Context, affectedVal types.Validato
panic("failed to create valid validator power iterator")
}

affectedValRank := GetValidatorsByPowerIndexKey(affectedVal, pool)
newCliffValRank := GetValidatorsByPowerIndexKey(newCliffVal, pool)

if bytes.Equal(affectedVal.Owner, newCliffVal.Owner) {
// The affected validator remains the cliff validator, however, since
// the store does not contain the new power, set the new cliff
// validator to the affected validator.
bz := GetValidatorsByPowerIndexKey(affectedVal, pool)
store.Set(ValidatorPowerCliffKey, bz)
} else if affectedValPower.GT(newCliffVal.GetPower()) {
// the store does not contain the new power, update the new power rank.
store.Set(ValidatorPowerCliffKey, affectedValRank)
} else if bytes.Compare(affectedValRank, newCliffValRank) > 0 {
// The affected validator no longer remains the cliff validator as it's
// power is greater than the new current cliff validator.
// power is greater than the new cliff validator.
k.setCliffValidator(ctx, newCliffVal, pool)
} else {
panic("invariant broken: the cliff validator should change or it should remain the same")
}
}

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14 changes: 13 additions & 1 deletion x/stake/keeper/validator_test.go
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Expand Up @@ -48,7 +48,6 @@ func TestSetValidator(t *testing.T) {
updates := keeper.GetTendermintUpdates(ctx)
require.Equal(t, 1, len(updates))
require.Equal(t, validator.ABCIValidator(), updates[0])

}

func TestUpdateValidatorByPowerIndex(t *testing.T) {
Expand Down Expand Up @@ -143,6 +142,19 @@ func TestCliffValidatorChange(t *testing.T) {
cliffPower = keeper.GetCliffValidatorPower(ctx)
require.Equal(t, newCliffVal.Owner, sdk.AccAddress(keeper.GetCliffValidator(ctx)))
require.Equal(t, GetValidatorsByPowerIndexKey(newCliffVal, pool), cliffPower)

// add enough power to cliff validator to be equal in rank to next validator
newCliffVal, pool, _ = newCliffVal.AddTokensFromDel(pool, 9)
keeper.SetPool(ctx, pool)
newCliffVal = keeper.UpdateValidator(ctx, newCliffVal)

// assert new cliff validator due to power rank construction
newCliffVal = validators[numVals-maxVals+2]
require.Equal(t, newCliffVal.Owner, sdk.AccAddress(keeper.GetCliffValidator(ctx)))

// assert cliff validator power should have been updated
cliffPower = keeper.GetCliffValidatorPower(ctx)
require.Equal(t, GetValidatorsByPowerIndexKey(newCliffVal, pool), cliffPower)
}

func TestSlashToZeroPowerRemoved(t *testing.T) {
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