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kevinveenbirkenbachandClaude Opus 5.5
32740d860f
utils/yaml_bootstrap.py promises that load_block(text) either equals
yaml.safe_load(text) or raises BootstrapYamlError. A fuzzer comparing
both found two inputs that broke the promise:
- str.splitlines() also breaks lines at \x0b, \x0c and \x1c to \x1e,
which PyYAML's reader rejects as non-printable. "\x1e/: R" came back
as {"/": "R"}, and a non-printable character inside a comment line was
skipped with the comment.
- An indented " ---" on line 1 was taken as the document marker, while
PyYAML reads it as a plain scalar and rejects the mapping that follows.
load_block now refuses any character outside PyYAML's own printable
class before it splits lines, and takes "---" as the document marker
only at column 0. The line breaks splitlines() still honours (\r, \r\n,
NEL, LS, PS) are line breaks for PyYAML too, so splitting stays as is.
The eight inputs join STRUCTURES in the divergence test; against the
previous reader, four of them diverge and fail it.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>