forked from 1b-agent/opencadstudio-upstream
Karim Jerbi
be8a7b95c4
Bug: The --serve automation loop (stdin/socket) and the MCP stdio loop read input with unbounded read_line/lines. A single line over 64 MiB - a huge paste or a hostile client - grows the buffer until the allocator aborts, the same class of failure as the HTTP path, on the non-HTTP transports. Reproduce: 1. Start --serve on a socket (or the MCP server on stdio). 2. Send one 65 MiB line with no terminating newline anywhere in it. 3. Before: RSS grows to the full line, then "memory allocation failed" (or a multi-second stall while the line is copied). 4. After: the read fails at the cap and the existing EOF arm closes the connection/stdio promptly. Fix: New shared src/io/line_read.rs module: lines_capped(reader, 64 MiB) yields Err for an over-cap line, which the serve and MCP loops already treat as EOF/close. rest.rs was refactored onto the same helpers so the cap logic lives in one place. A regression test streams a 65 MiB line at the serve socket and asserts the connection ends without a response.