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docs: Update language around immutable programs (#21116)

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This commit is contained in:
Jon Cinque
2021-11-01 21:41:49 +01:00
committed by GitHub
parent ca51ea3e04
commit ec86ff8fb3
3 changed files with 16 additions and 8 deletions
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8
docs/src/developing/programming-model/accounts.md
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@@ -47,9 +47,11 @@ instruction's [program id](transactions.md#program-id). Accounts are marked as
executable during a successful program deployment process by the loader that
owns the account. When a program is deployed to the execution engine (BPF deployment),
the loader determines that the bytecode in the account's data is valid.
If so, the loader
permanently marks the program account as executable. Once executable, the
runtime enforces that the account's data (the program) is immutable.
If so, the loader permanently marks the program account as executable.
If a program is marked as final (non-upgradeable), the runtime enforces that the
account's data (the program) is immutable. Through the upgradeable loader, it is
possible to upload a totally new program to an existing program address.
## Creating

6
docs/src/developing/programming-model/calling-between-programs.md
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@@ -84,8 +84,10 @@ signers and writable accounts. For example, if the instruction the caller is
processing contains a signer or writable account, then the caller can invoke an
instruction that also contains that signer and/or writable account.
This privilege extension relies on the fact that programs are immutable. In the
case of the `acme` program, the runtime can safely treat the transaction's
This privilege extension relies on the fact that programs are immutable, except
during the special case of program upgrades.
In the case of the `acme` program, the runtime can safely treat the transaction's
signature as a signature of a `token` instruction. When the runtime sees the
`token` instruction references `alice_pubkey`, it looks up the key in the `acme`
instruction to see if that key corresponds to a signed account. In this case, it