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Remove create_account bandaid now that to's signature is required #7776

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Jan 15, 2020
Merged

Remove create_account bandaid now that to's signature is required #7776

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ad7d9c9
Remove create account bandaid now that requires signature
rob-solana Jan 13, 2020
f4b4842
shrink scope of this PR to bandaid
rob-solana Jan 15, 2020
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27 changes: 20 additions & 7 deletions runtime/src/system_instruction_processor.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -84,10 +84,8 @@ fn finish_create_account(
}

// if it looks like the `to` account is already in use, bail
if to.account.lamports != 0
|| !to.account.data.is_empty()
|| !system_program::check_id(&to.account.owner)
{
// (note that the id check is also enforced by message_processor)
if !to.account.data.is_empty() || !system_program::check_id(&to.account.owner) {
debug!(
"CreateAccount: invalid argument; account {} already in use",
to.unsigned_key()
Expand Down Expand Up @@ -116,7 +114,7 @@ fn finish_create_account(
return Err(SystemError::InvalidAccountDataLength.into());
}

// guard against sysvars being assigned
// guard against sysvars being made
if sysvar::check_id(&program_id) {
debug!("Assign: program id {} invalid", program_id);
return Err(SystemError::InvalidProgramId.into());
Expand All @@ -141,7 +139,7 @@ fn assign_account_to_program(
return Err(InstructionError::MissingRequiredSignature);
}

// guard against sysvars being assigned
// guard against sysvars being made
if sysvar::check_id(&program_id) {
debug!("Assign: program id {} invalid", program_id);
return Err(SystemError::InvalidProgramId.into());
Expand Down Expand Up @@ -515,6 +513,7 @@ mod tests {

#[test]
fn test_create_already_in_use() {
solana_logger::setup();
// Attempt to create system account in account already owned by another program
let new_program_owner = Pubkey::new(&[9; 32]);
let from = Pubkey::new_rand();
Expand All @@ -538,7 +537,8 @@ mod tests {
assert_eq!(from_lamports, 100);
assert_eq!(owned_account, unchanged_account);

let mut owned_account = Account::new(10, 0, &Pubkey::default());
// Attempt to create system account in account that already has data
let mut owned_account = Account::new(0, 1, &Pubkey::default());
let unchanged_account = owned_account.clone();
let result = create_account(
&mut KeyedAccount::new(&from, true, &mut from_account),
Expand All @@ -551,6 +551,19 @@ mod tests {
let from_lamports = from_account.lamports;
assert_eq!(from_lamports, 100);
assert_eq!(owned_account, unchanged_account);

// Verify that create_account works even if `to` has a non-zero balance
let mut owned_account = Account::new(1, 0, &Pubkey::default());
let result = create_account(
&mut KeyedAccount::new(&from, true, &mut from_account),
&mut KeyedAccount::new(&owned_key, true, &mut owned_account),
50,
2,
&new_program_owner,
);
assert_eq!(result, Ok(()));
assert_eq!(from_account.lamports, from_lamports - 50);
assert_eq!(owned_account.lamports, 1 + 50);
}

#[test]
Expand Down