Add software plan blocks #30
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The FullLoader was added in a new version of YAML, and thus breaks installs with older versions. We likely only need the safe subset of YAML anyway, so for now, just switch to the SafeLoader.
orwonthe
reviewed
May 22, 2019
| @@ -73,7 +73,7 @@ def context_from_data_files(data_filenames): | |||
| with open(data_filename, 'r') as data_file: | |||
| data_string = data_file.read() | |||
| try: | |||
| data = yaml.load(data_string, Loader=yaml.FullLoader) | |||
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This change eliminates the ability to have the yaml contain any custom objects we have imported. Is this necessary? From yaml/pyyaml#257 ...
We added a new loader class called FullLoader, and we made it the default for
load(). This class is almost as complete for serialization as
UnsafeLoader/Loader, but it avoids arbitrary code execution. We don't expect it
will break any code in the wild.
We still recommend that people choose SafeLoader for untrusted data, but
aribitrary code execution will no longer be possible using yaml.load() with
the default loader (FullLoader). FullLoader will instantiate objects of classes
that you have imported. Since object instantiation runs the class's constructor
code, that may be exploitable.
orwonthe
approved these changes
May 22, 2019
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