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consensus/clique: add some missing checks (#22836)

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This commit is contained in:
Martin Holst Swende 2021-05-07 10:31:01 +02:00 committed by GitHub
parent a5669ae292
commit 8a070e8f7d
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 19 additions and 0 deletions
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19
consensus/clique/clique.go
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@ -20,6 +20,7 @@ package clique
import (
"bytes"
"errors"
"fmt"
"io"
"math/big"
"math/rand"
@ -293,6 +294,15 @@ func (c *Clique) verifyHeader(chain consensus.ChainHeaderReader, header *types.H
return errInvalidDifficulty
}
}
// Verify that the gas limit is <= 2^63-1
cap := uint64(0x7fffffffffffffff)
if header.GasLimit > cap {
return fmt.Errorf("invalid gasLimit: have %v, max %v", header.GasLimit, cap)
}
// Verify that the gasUsed is <= gasLimit
if header.GasUsed > header.GasLimit {
return fmt.Errorf("invalid gasUsed: have %d, gasLimit %d", header.GasUsed, header.GasLimit)
}
// If all checks passed, validate any special fields for hard forks
if err := misc.VerifyForkHashes(chain.Config(), header, false); err != nil {
return err
@ -324,6 +334,15 @@ func (c *Clique) verifyCascadingFields(chain consensus.ChainHeaderReader, header
if parent.Time+c.config.Period > header.Time {
return errInvalidTimestamp
}
// Verify that the gas limit remains within allowed bounds
diff := int64(parent.GasLimit) - int64(header.GasLimit)
if diff < 0 {
diff *= -1
}
limit := parent.GasLimit / params.GasLimitBoundDivisor
if uint64(diff) >= limit || header.GasLimit < params.MinGasLimit {
return fmt.Errorf("invalid gas limit: have %d, want %d += %d", header.GasLimit, parent.GasLimit, limit)
}
// Retrieve the snapshot needed to verify this header and cache it
snap, err := c.snapshot(chain, number-1, header.ParentHash, parents)
if err != nil {