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Implement weak subjectivity safety checks (#7347)

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Closes #7273


  https://github.com/ethereum/consensus-specs/pull/4179


Co-Authored-By: Eitan Seri-Levi <eserilev@ucsc.edu>

Co-Authored-By: Eitan Seri- Levi <eserilev@gmail.com>

Co-Authored-By: Michael Sproul <michaelsproul@users.noreply.github.com>

Co-Authored-By: dapplion <35266934+dapplion@users.noreply.github.com>
This commit is contained in:
Eitan Seri-Levi
2026-02-10 13:52:52 -08:00
committed by GitHub
parent a1176e77be
commit 56eb81a5e0
12 changed files with 222 additions and 15 deletions
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29
beacon_node/beacon_chain/src/builder.rs
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@@ -41,7 +41,7 @@ use std::sync::Arc;
use std::time::Duration;
use store::{Error as StoreError, HotColdDB, ItemStore, KeyValueStoreOp};
use task_executor::{ShutdownReason, TaskExecutor};
use tracing::{debug, error, info};
use tracing::{debug, error, info, warn};
use tree_hash::TreeHash;
use types::data::CustodyIndex;
use types::{
@@ -848,6 +848,33 @@ where
));
}
// Check if the head snapshot is within the weak subjectivity period
let head_state = &head_snapshot.beacon_state;
let Ok(ws_period) = head_state.compute_weak_subjectivity_period(&self.spec) else {
return Err(format!(
"Unable to compute the weak subjectivity period at the head snapshot slot: {:?}",
head_state.slot()
));
};
if current_slot.epoch(E::slots_per_epoch())
> head_state.slot().epoch(E::slots_per_epoch()) + ws_period
{
if self.chain_config.ignore_ws_check {
warn!(
head_slot=%head_state.slot(),
%current_slot,
"The current head state is outside the weak subjectivity period. You are currently running a node that is susceptible to long range attacks. \
It is highly recommended to purge your db and checkpoint sync. For more information please \
read this blog post: https://blog.ethereum.org/2014/11/25/proof-stake-learned-love-weak-subjectivity"
)
}
return Err(
"The current head state is outside the weak subjectivity period. A node in this state is susceptible to long range attacks. You should purge your db and \
checkpoint sync. For more information please read this blog post: https://blog.ethereum.org/2014/11/25/proof-stake-learned-love-weak-subjectivity \
If you understand the risks, it is possible to ignore this error with the --ignore-ws-check flag.".to_string()
);
}
let validator_pubkey_cache = self
.validator_pubkey_cache
.map(|mut validator_pubkey_cache| {