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SolanaVrf v1.0.0 - #69
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process_purge_expired_requests removed expired items one at a time, and each removal re-scanned the queue and re-trimmed trailing holes, giving the instruction O(n^2) cost. A full queue could therefore exceed the Solana per-transaction compute budget, letting an attacker who fills the queue with non-executable items brick it permanently: the purge would always run out of compute before it could clear them, and no further requests could be served. Replace the per-index removal loop with QueueAccount::remove_items_matching, which walks the queue once, marks matching used items as holes in place (preserving byte offsets so free spans stay reusable), and trims trailing holes a single time at the end. Purging is now O(n) regardless of how many items are removed, so a full queue can always be cleared within budget. Add unit tests covering a full mainnet-size queue, partial removal with survivor integrity and hole reuse, and the no-op case.
Bound the oracle queue account to MAX_QUEUE_ACCOUNT_SIZE (1 MiB) and reject oversized target sizes in process_initialize_oracle_queue with a new QueueSizeTooLarge error. This keeps the single-pass purge, and every other O(n) queue operation, bounded by a fixed maximum item count rather than by the 10 MiB Solana account ceiling. Most of the added lines are tests. New live Banks-runtime integration tests exercise the real instructions end to end: - purge_stress_test.rs: stages the advisory's worst case (a full 30,000-byte queue of 312 expired requests) and a full max-size (1 MiB) queue, purges each through the real instruction under the mainnet compute cap, and asserts the queue fully drains with correct fee accounting; a mixed expired/live case verifies survivors stay intact, freed slots become reusable holes, and trailing holes shrink the cursor. - queue_size_limit_test.rs: an over-limit target size is rejected with QueueSizeTooLarge, while a valid size initializes the queue correctly.
SBF measurement puts a single queue scan at ~73.5 CU/item. The purge does one scan, but the request and fulfillment paths scan the queue up to two and three times respectively, so those are the binding constraint. A 512 KiB cap (~5,400 items) keeps even the three-scan fulfillment path well within the 1.4M CU per-transaction budget, with room for the VRF verification and the callback CPI; the previous 1 MiB cap did not.
A queue can only be closed once empty, but anyone could keep adding requests to a non-empty queue and prevent it from ever being closed. Add an oracle-gated pause switch so the oracle can stop accepting new requests, drain the queue, and then close it. - Store a `paused` flag in the queue header's former padding, so existing (zeroed) accounts read as active — no migration needed. - Add a `SetQueuePaused` instruction (oracle-signed, queue PDA bound to the oracle) to set or clear the flag. - Reject `request_randomness` on a paused queue with a new `QueuePaused` error. Tests: pause/unpause round-trip against a program-owned queue, backward-compat (fresh queue reads active), and rejection of a non-oracle signer.
Delegating an oracle queue to the rollup is a one-time setup step, but the handler delegated without checking whether the queue was already in use. A queue already relied upon by mainnet projects could therefore be pulled into the rollup, breaking those integrations. Reject delegation unless the queue has never held an item: item_count == 0 and the entire variable region (everything after the header) is still zero. The byte check matters because a drained queue leaves non-zero bytes behind, so it is correctly treated as used rather than pristine. Test: delegating a queue that holds a request is rejected with the new QueueAlreadyInUse error, before any delegation CPI.
Delegating an oracle queue to the rollup is meant to be one-way: once a queue is delegated it should stay on the rollup and never return to mainnet, where undelegation could break existing integrations. Remove the undelegation path entirely: - delete the `process_undelegate_oracle_queue` and `process_undelegation` handlers and their dispatch arms; - drop the `UndelegateOracleQueue` and `ProcessUndelegation` instruction variants, the `UndelegateOracleQueue` struct, and the now-unused `PdaSeeds` helper and SDK builder; - remove the corresponding CLI command.
Request expiry used a fixed slot count (QUEUE_TTL_SLOTS = 240), which assumes a constant slot duration. Solana's slot duration is planned to change, which would make requests expire too quickly. Measure age in wall-clock seconds instead: - process_purge_expired_requests derives age from the current epoch's average slot duration (elapsed_secs / elapsed_slots) and compares to a new QUEUE_TTL_SECONDS. Only age accrued within the current epoch is counted (slot_age is capped at elapsed_slots), so the estimate can never exceed real elapsed time and a request is never expired before its TTL, including across an epoch boundary. - Remove QUEUE_TTL_SLOTS. The off-chain oracle now derives its slot threshold from the measured slot duration via SlotTracker::ttl_slots(), falling back to a nominal rate until enough samples are collected so a noisy measurement can't shrink the threshold and cause premature purging. Tests: purge_ttl_test drives the real instruction with a controlled clock and asserts an old request is purged while a fresh one is kept.
item_next returns align_up(cursor + size_of::<QueueItem>() + ...), and size_of::<QueueItem>() is 96, so the returned position is always strictly greater than cursor. The `next <= cursor` guard in every queue scan loop could therefore never fire, making it misleading; worse, had it ever fired it would have silently broken the loop and (in trim_trailing_holes) truncated the logical queue. Remove the guard from all scan loops.
…table flag The callback filter classified an account as a program using only its `executable` flag. That flag is not a reliable signal: runtime checks on it were removed, legacy programs not deployed up to their target size have `executable == false` while being executable, and future loaders might not set it at all. Complement the flag with an owner check: treat any account owned by a BPF or native loader as a program. This is a conservative superset (it also matches program-data and buffer accounts), which is acceptable for a callback filter since no legitimate integration passes those in a VRF callback.
The empty-slice guards in callback_discriminator, account_metas and callback_args can never trigger: write_item_at is the only writer and rejects out-of-bounds items, and end = start + unsigned len makes start > end impossible. Deleting them means any impossible state now aborts via slice bounds checking instead of silently returning empty callback data (GHSA-2fj8-r7mf-xp8c).
Six methods (scan_for_reusable_span, trim_trailing_holes, iter_items, get_item_by_index, remove_item, find_item_by_id) each re-implemented the same raw byte-offset / unaligned-read / alignment-rounding traversal. Copying this delicate logic six times widened the risk surface: any change had to be mirrored in all copies, and missing one could break a queue invariant. Introduce a single scan_items(visit) helper that owns the iteration, and express each method as a thin closure carrying only its own search or mutation logic. Behavior is unchanged: the visitor's logical_index matches the previous per-method used-item counters.
Replace the four unsafe byte/typed conversions in the queue state with their bytemuck equivalents: cast_slice for reading callback account metas and serializing metas to bytes, pod_read_unaligned for reading a QueueItem from the variable region, and bytes_of for writing one back. Semantics are unchanged (CompactAccountMeta is align-1 and item callers always pass exactly size_of::<QueueItem>() bytes); invalid lengths now panic instead of being undefined behavior. Adds a unit test comparing each safe form byte-for-byte against the previous unsafe form (GHSA-qw9w-qjqg-5qgp).
Each request's id is a hash that includes the byte position where the item is placed in the queue. To know that position, process_request_randomness called insertion_position (a full queue scan) and then add_item (a second full scan to find the same position and write). Inserting one request scanned the queue twice, and both scans had to agree on the position. Add QueueAccount::add_item_with_id, which derives the id from the actual insertion offset via a caller-provided closure during the single placement scan, and route request_randomness through it. add_item is kept as a fixed-id wrapper for existing callers, and insertion_position is deleted. Behavior is unchanged: the closure receives the same byte position insertion_position returned, so the combined hash and the logged index are identical.
Readability cleanups that do not change on-chain behavior: - Rename the scan-loop local `cursor` to `offset_index` so it no longer overshadows the `header.cursor` field. - Rename the instruction enum `EphemeralVrfInstruction` to `SolanaVrfInstruction` (several variants are not ephemeral-specific). - Rename the `Oracle.open_queue` field to `open_queues` (it is a count). - Move `entrypoint!` to the top of the program crate, ahead of its helpers. - Use `realloc_size` for the PDA size in both branches of queue init (it equals MAX_EXTRA_BYTES there, since the account is still empty). - Rename the shadowing `let mut data` to `raw_data` in provide_randomness. - Log through the `log` helper instead of `msg!` in modify_oracles. - Replace an explicit `drop(oracles_data)` with a scoped block. - Initialize the inserted request with `used: 1` in request_randomness (write_item_at still normalizes it, so a written item is never a phantom). - Define `aligned` once in add_item. Note: renaming `EphemeralVrfInstruction` and the `open_queue` field is a breaking change for downstream consumers of ephemeral-vrf-api.
Remove parameters that every call site passed the same constant to, fetching the constant inside the function instead: create_pda's owner and parse_instruction8's api_id are always the VRF program ID, and align_up's and item_next's align is always align_of::<QueueItem>(). Hardcoding the program ID in create_pda also makes it impossible for a future call site to create a PDA owned by the wrong program (GHSA-g47v-hmp9-59mf).
Fix documentation errors flagged in the audit: replace 'vrf-macro' template leftovers with 'delegate' or 'callback' per context, correct account indices in delegate_oracle_queue (owner program is account 6, delegation accounts 2-4), reorder the process_undelegation account list to match the code and drop the unfounded payer-signer claim (the delegation buffer is the required signer), document the oracle as a signer and oracle queues as writable where the handlers enforce it, complete the combined-hash input list (Unix timestamp and insertion position), renumber a duplicated step, and fix typos (mus/must, accrue/accrues, SerializableAccountMeta/CompactAccountMeta). Also updates the InvalidCallbackAccounts display string; the error discriminant is unchanged (GHSA-p22g-w8xh-6f7v).
Every queue instruction stripped the 8-byte account discriminator (`&mut data[8..]`) before calling QueueAccount::load, while load itself documented this as the caller's responsibility. Repeating the offset at each call site is error-prone: a caller that forgets it, or slices the wrong offset, would misread the queue. Move the discriminator handling into load: it now takes the full account data, validates the discriminator, and skips it internally. Validating (rather than only skipping) means a caller that still passes already-stripped data fails loudly with InvalidAccountData instead of silently reading the header from the wrong offset. Queue-relative item offsets are unchanged. Migrate every caller to pass full account data: the five program handlers, the off-chain oracle, and the unit and integration tests.
- Remove the unused EphemeralVrfError variants QueueFull, InvalidAccountData, AccountAlreadyInitialized and OracleNotRegistered. Remaining variants keep their explicit discriminants, so no error code changes. - Drop the stale #[allow(unused_macros)] on the instruction8! macro, which is used to generate serialization for 8 instruction structs. - Discard the unused _logical_index binding returned by add_item in process_request_randomness. - Delete the unused RequestRandomness::to_bytes off-chain helper (try_from_bytes is kept).
# Conflicts: # api/src/error.rs
…count (GHSA-jfrf-hrgx-4jqm)
# Conflicts: # program/src/lib.rs # program/src/process_undelegation.rs
…GHSA-7938-x62v-pxc5) # Conflicts: # api/src/state/queue.rs
…-8mg7-jc7g-vv56) # Conflicts: # api/src/state/queue.rs
…ers (GHSA-2fj8-r7mf-xp8c)
…7m8-w8cq, GHSA-79x7-3xx3-jm72) # Conflicts: # api/src/error.rs # program/src/purge_expired_requests.rs
…fc-6w7h) # Conflicts: # api/src/state/queue.rs
…HSA-qw9w-qjqg-5qgp)
…GHSA-j953-hg6c-4v75)
# Conflicts: # api/src/instruction.rs # api/src/state/queue.rs # program/src/initialize_oracle_queue.rs # program/src/lib.rs # program/src/provide_randomness.rs
# Conflicts: # api/src/instruction.rs # program/src/request_randomness.rs
Adjustments required only by combining the fixes on one branch (each is green in isolation): - Purge (C1 single-pass) computes each request's wall-clock age (C7) with the epoch-relative rate hoisted out of the per-item loop and in native u64 rather than emulated i128. Values are bounded by a single epoch so u64 cannot overflow; this keeps a single-pass purge of a full max-size (512 KiB) queue well within the compute budget (~735k of 1.4M CU on SBF), which the naive per-item i128 form exceeded. - set_queue_paused (C3 handler) now passes full account data to QueueAccount::load, matching C19's discriminator-handling contract. - purge_stress_test (C1) advances the Clock timestamp to expire requests, since C7 switched expiry from a fixed slot count to wall-clock time. - Integration tests staging queue accounts now pass full data to QueueAccount::load (C19 contract) and drop unnecessary `mut` bindings.
- Reject SetQueuePaused values other than 0/1 with InvalidInstructionData, and assign the validated flag directly (with a regression test). - Re-apply the single `aligned` definition in add_item_with_id (the C17 hunk lost while resolving the merge with the C15 restructuring). - Standardize logging on msg! and drop the log(String) helper, which only added a format! allocation on top of msg!. - Make QUEUE_TTL_SECONDS a u64 (it is a duration, not a timestamp) and drop the max(0) clamps at both use sites. - Rename the shadowed `acc` slice to `body` in QueueAccount::load.
The IDL had drifted badly from the program: it listed only 5 of the 12 instructions plus the removed undelegateOracleQueue, used wrong discriminators (the entrypoint reads an 8-byte [tag, 0..0] prefix), and described provideRandomness with a stale single-argument payload. - Add modifyOracle, closeOracleQueue, requestRandomness, purgeExpiredRequests, both scoped request variants, and setQueuePaused. - Remove undelegateOracleQueue (instruction removed with the undelegation path). - Correct discriminators, account lists, writability/signer flags and argument layouts against the handlers and api/src/sdk.rs builders. - List the full EphemeralVrfError set (13 codes, was 3).
Second-round review item 36: EphemeralVrfError::OracleNotAuthorized (code 10) is never constructed by the program, and never has been. Drop it from the enum and the IDL error table. Remaining variants keep their explicit discriminants, so no error code changes.
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WalkthroughThe pull request renames the project to Solana VRF, updates its instruction and error contracts, changes queue storage and expiry handling, adds queue pause and size controls, removes undelegation support, and updates CLI, oracle, and integration tests. ChangesSolana VRF contracts and workspace
Estimated code review effort: 5 (Critical) | ~120 minutes Merge Risk: 🟡 Moderate · up to Expired requests can remain queued after an epoch rollover, while the queue loader introduces undefined behavior in core account handling. These issues should be corrected before merge. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 68.06% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 72 functions across 31 files. (11 skipped: 11 unsupported.)
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In @.github/workflows/publish-packages.yml:
- Line 1: Add a job-level permissions declaration to the publishing workflow,
granting only the read access required by checkout and the write access required
for GitHub release uploads. Keep all other token scopes disabled and preserve
the existing publish job behavior.
In `@api/src/state/queue.rs`:
- Line 182: Update QueueAccount::load and QueueAccount to store only the backing
acc value, removing the separately stored mutable header reference. Add a
checked bytemuck-based mutable header accessor that views
acc[..size_of::<Queue>()] and returns the Queue reference when valid, then
update callers to use this accessor.
In `@program/src/purge_expired_requests.rs`:
- Around line 70-72: Update the age calculation in the purge predicate so it
uses a nominal slot rate when the current epoch’s elapsed time is insufficient
to measure QUEUE_TTL_SECONDS, allowing genuinely expired requests to be removed
immediately after rollover. Preserve the existing elapsed-time-based calculation
once enough epoch time has accumulated, and keep the final QUEUE_TTL_SECONDS
comparison unchanged.
In `@program/tests/purge_ttl_test.rs`:
- Around line 69-73: Add an epoch-boundary regression case in the purge TTL
tests using process_purge_expired_requests: include a QueueItem from the prior
epoch, configure Clock shortly after the next epoch begins, and assert the item
is purged once its total age exceeds QUEUE_TTL_SECONDS. Keep the existing
epoch-0 fixture coverage intact.
In `@program/tests/queue_size_limit_test.rs`:
- Line 94: Add an exact-maximum success case near the existing queue-size tests,
using target_size = MAX_QUEUE_ACCOUNT_SIZE. Submit every instruction returned by
initialize_oracle_queue and assert the process_initialize_oracle_queue flow
succeeds, preserving coverage that the maximum limit is inclusive.
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📒 Files selected for processing (47)
.github/packages/npm-package/package.json.tmpl.github/workflows/publish-packages.ymlCargo.tomlREADME.mdapi/Cargo.tomlapi/idl/idl.jsonapi/src/consts.rsapi/src/error.rsapi/src/instruction.rsapi/src/macros.rsapi/src/pda.rsapi/src/sdk.rsapi/src/state/oracle.rsapi/src/state/queue.rsapi/src/steel.rsprogram/Cargo.tomlprogram/src/close_oracle_queue.rsprogram/src/delegate_oracle_queue.rsprogram/src/fees.rsprogram/src/initialize.rsprogram/src/initialize_oracle_queue.rsprogram/src/lib.rsprogram/src/modify_oracles.rsprogram/src/process_undelegation.rsprogram/src/provide_randomness.rsprogram/src/purge_expired_requests.rsprogram/src/request_randomness.rsprogram/src/set_queue_paused.rsprogram/src/undelegate_oracle_queue.rsprogram/tests/delegate_unused_test.rsprogram/tests/fixtures/mod.rsprogram/tests/integration/use-randomness/Anchor.tomlprogram/tests/pause_queue_test.rsprogram/tests/purge_stress_test.rsprogram/tests/purge_ttl_test.rsprogram/tests/queue_size_limit_test.rsprogram/tests/test.rssrc/Cargo.tomlvrf-cli/Cargo.tomlvrf-cli/src/main.rsvrf-oracle/Cargo.tomlvrf-oracle/src/oracle/client.rsvrf-oracle/src/oracle/processor.rsvrf-oracle/src/oracle/sources.rsvrf-oracle/src/oracle/utils.rsvrf/Cargo.tomlvrf/examples/keygen.rs
💤 Files with no reviewable changes (5)
- api/src/macros.rs
- api/src/steel.rs
- program/src/undelegate_oracle_queue.rs
- src/Cargo.toml
- program/src/process_undelegation.rs
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| name: Publish SolanaVrf packages | |||
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🔒 Security & Privacy | 🛡️ Analyzed with Security Review | 🟠 Major | ⚡ Quick win
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echo "Permission and trigger declarations:"
rg -n '^(on:|permissions:|jobs:)|^[[:space:]]+(permissions:|contents:|id-token:|packages:|attestations:)' "$file" || trueRepository: magicblock-labs/solana-vrf
Length of output: 7696
Security Misconfiguration
Reachability: External
Exploitability: Moderate
CWE: CWE-732 — Incorrect Permission Assignment for Critical Resource
Declare least-privilege permissions for the publishing workflow.
The workflow passes GITHUB_TOKEN to third-party actions but declares no explicit permissions. Define the minimum required permissions at job level, including only the scopes needed for checkout and GitHub release uploads.
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permissions declaration to the publishing workflow, granting only the read
access required by checkout and the write access required for GitHub release
uploads. Keep all other token scopes disabled and preserve the existing publish
job behavior.
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Bumps the program, oracle and CLI to v1.0.0 and renames the crates from
ephemeral-vrf-*tosolana-vrf-*.SetQueuePaused) to drain it before closingbytemuck; the queue loader validates the account discriminator itselfInstruction discriminators, account layouts, PDA seeds and proofs are unchanged, so existing queues keep working. Rust consumers of the api crate need to update crate and type names (
SolanaVrfError,SolanaVrfInstruction).Summary by CodeRabbit
New Features
Updates
Removed