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fix(code-runtime-python): bound the open-merge hold by the ledger budget

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The review's critical: the open-merge branch accumulated the held fragment
before any ledger check, so a forged open flood could grow host memory without
touching logBudget. The held fragment is now bounded by the exact-cost walk
(jsonStringCostUpTo against the remaining budget; the closing frame's admit()
still bills the merged entry once), and the open field is registered in the
README wire-contract section and the fd-3 protocol note (en + zh). A forged
open-flood case asserts truncation to the marker under a 64-byte budget.
This commit is contained in:
Chinesezjc
2026-08-31 15:03:20 +08:00
committed by Tianyi Cui
parent 72691455e9
commit ea1d28a068
8 changed files with 45 additions and 11 deletions
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packages/code-runtime/code-runtime-python/README.zh.md
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@@ -33,7 +33,7 @@ kind: "package-reference"
### wire
帧在子进程 fd 3 上以 JSON-lines 传输——每行一个对象——因此 stdout/stderr 留给程序自己的输出。子进程 → 宿主：`boot-ack`、`call`、`log`、`done`。宿主 → 子进程：`boot`（首帧，携带全部上限与命名空间声明）、`run`（`boot-ack` 之后，只携带程序体）与每个 `call` 一个 `reply`。伪造帧可在 `done` 上同时携带 `value` 与 `error`，因此消费方必须先检查 `error`，在它存在时忽略 `value`。
帧在子进程 fd 3 上以 JSON-lines 传输——每行一个对象——因此 stdout/stderr 留给程序自己的输出。子进程 → 宿主：`boot-ack`、`call`、`log`、`done`。宿主 → 子进程：`boot`（首帧，携带全部上限与命名空间声明）、`run`（`boot-ack` 之后，只携带程序体）与每个 `call` 一个 `reply`。伪造帧可在 `done` 上同时携带 `value` 与 `error`，因此消费方必须先检查 `error`，在它存在时忽略 `value`。`log` 帧的 `open` 标志标记由显式 flush 提交的未结束行：宿主把下一个 log 帧追加到同一条目，因此 `print('a', end='', flush=True); print('b')` 读回为一条 `'ab'` 条目而不是假换行。
### 可能出错的地方