account-lifecycle

Agent Building

Trigger Pattern ACCOUNT_CLOSING flag detected (close/CloseAccount usage) - Inject Into Breadth agents, depth agents

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ACCOUNT_LIFECYCLE Skill

Trigger Pattern: ACCOUNT_CLOSING flag detected (close/CloseAccount usage) Inject Into: Breadth agents, depth agents Finding prefix: [AL-N] Rules referenced: S4, R9

For every account close operation in the Solana program:

1. Close Operation Inventory

List all account closing operations:

#	Instruction	Account Closed	Close Method	Lamport Recipient	Location
1	{ix}	{account}	Anchor `close` / manual	{recipient}	{file:line}

2. Close Completeness

For each close operation, verify ALL steps:

Close Op	Data Zeroed?	Lamports Transferred?	Discriminator Set to CLOSED?	Owner Transferred to System?
{op}	YES/NO	YES/NO	YES/NO	YES/NO

Anchor close: Handles all 4 steps automatically. Manual closing MUST do all 4. Missing step impact:

Data not zeroed → residual data readable by other programs
Lamports not fully transferred → rent-exempt lamports stranded (Rule 9)
Discriminator not set → account can be "reopened" with stale type
Owner not transferred → program still has authority over closed account

3. Revival Attack Analysis (S4 - CRITICAL)

For each close operation:

Close Op	Same-Tx Refund Possible?	Revival Guard?	Attack Sequence
{op}	YES/NO	YES/NO	{if YES: describe}

Attack (S4): Within the SAME transaction, after an account is closed (lamports drained, data zeroed):

Close account (lamports go to attacker)
In same tx, re-fund account with lamports (becomes rent-exempt again)
Account data is all zeros but account exists again
Next instruction that checks account.data_len() > 0 or assumes "closed accounts don't exist" fails

Defense: Set discriminator to a CLOSED sentinel value. Check discriminator on every access, not just data length.

4. Rent Recovery

For each close operation:

Account	Rent-Exempt Lamports	Fully Recovered?	Recipient Correct?
{account}	{amount}	YES/NO	{who gets the lamports}

Check: Are ALL lamports transferred? Partial transfer leaves lamports stranded.

5. Token Account Closure

For each SPL Token account closure:

Token Account	Balance Checked Zero?	Withheld Fees Harvested? (Token-2022)	Close Authority Correct?
{account}	YES/NO	YES/NO/N/A	{who can close it}

SPL Token rule: Token accounts can only be closed when balance == 0. Token-2022: Accounts with TransferFeeConfig may have withheld fees. Must harvest before close.

6. Reinitialization Prevention

For each account type that can be initialized:

Account Type	Init Method	Can Be Re-Initialized?	Guard
{type}	`init` / `init_if_needed` / manual	YES/NO	{what prevents it}

init_if_needed WARNING: This attribute allows reinitialization if the account already exists. It is a known footgun. Safe pattern: Use init (fails if account exists) + manual is_initialized flag for manual programs. Attack: Re-initialize an account to reset its state (e.g., reset reward counter, change authority).

Finding Template

**ID**: [AL-N]
**Severity**: [revival = High, stranded rent = Medium, reinit = High]
**Step Execution**: ✓1,2,3,4,5,6 | ✗(reasons) | ?(uncertain)
**Rules Applied**: [S4:✓, R9:✓/✗]
**Location**: program/src/{file}.rs:LineN
**Title**: [Lifecycle issue] in [instruction] enables [attack]
**Description**: [Specific lifecycle vulnerability with code trace]
**Impact**: [Fund theft via revival / stranded assets / state reset]

Step Execution Checklist (MANDATORY)

Section	Required	Completed?	Notes
1. Close Operation Inventory	YES	✓/✗/?	For every close
2. Close Completeness	YES	✓/✗/?	All 4 steps verified
3. Revival Attack Analysis	YES	✓/✗/?	CRITICAL - same-tx refund
4. Rent Recovery	YES	✓/✗/?	Full lamport transfer
5. Token Account Closure	IF token accounts closed	✓/✗(N/A)/?	Balance + withheld fees
6. Reinitialization Prevention	YES	✓/✗/?	init_if_needed is dangerous