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Make ED of zero (kind of) work #13655
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gavofyork
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A0-please_review
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ggwpez
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Mar 20, 2023
sam0x17
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ruseinov
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There's at least one team who is unfortunately relying on it. |
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Altered the PR to ban an ED of zero unless you enable it with |
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@ggwpez could you quickly re-review? |
ggwpez
reviewed
Mar 21, 2023
Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
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Could name the feature |
ggwpez
reviewed
Mar 23, 2023
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bot rebase |
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Rebased |
breathx
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Apr 22, 2023
* Minimum of 1 for ED * Avoid need for ED to be minimum one * Docs * Ban ED of zero unless feature enabled * use integrity_test * Docs * Cleanup * Update frame/balances/Cargo.toml Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> * Update frame/balances/src/lib.rs Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> * Update frame/balances/src/lib.rs Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> * Ensure dodgy code is disabled by default * zero_ed -> insecure_zero_ed --------- Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> Co-authored-by: parity-processbot <>
louismerlin
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D1-audited 👍
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This pull request has been mentioned on Polkadot Forum. There might be relevant details there: https://forum.polkadot.network/t/polkadot-release-analysis-v0-9-41-v0-9-42/2828/1 |
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nathanwhit
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Jul 19, 2023
* Minimum of 1 for ED * Avoid need for ED to be minimum one * Docs * Ban ED of zero unless feature enabled * use integrity_test * Docs * Cleanup * Update frame/balances/Cargo.toml Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> * Update frame/balances/src/lib.rs Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> * Update frame/balances/src/lib.rs Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> * Ensure dodgy code is disabled by default * zero_ed -> insecure_zero_ed --------- Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> Co-authored-by: parity-processbot <>
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Make things work when existential deposit is zero. Note this means that once an account has a balance at all it will always have a provider, so naturally represents an account spam vector.
The problem of having an ED of zero is that the balances provider "always" exists because the account begins with a balance which satisfies
>= ED. Therefore it never actually increments the provider ref, assuming it has already been incremented at some point in the past when the balance became>= ED.So now we increment it either when it becomes newly
>= EDor when it should already be incremented but there are zero provider refs.When
ED > 0, the latter condition can never be true since if balance>= EDis satisfied there will already be a provider ref in place.