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JavaScript: Add model of JSON parsers #10

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Merged
merged 3 commits into from
Aug 6, 2018

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asger-semmle
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Adds JsonParserCall which models a call to a JSON parser.

  • I've deprecated the AST-based JsonParseCall to avoid confusion.
  • The default taint step through JSON.parse has been updated to include JsonParserCall.
  • The NosqlInjection query used two-pass taint tracking to identify user-controlled JSON.parse calls, and then use those as sources. This was redundant with the taint step through JSON.parse, however. This has been removed, instead relying on the standard taint step. I've added a test to make sure it still works. In theory, some results may disappear since the two-step solution technically allowed for mismatched call/returns.

The evaluation indicates no changes; maybe a slight speed-up even due to NosqlInjection. The speed-up could be covering up a slow-down elsewhere, but looking over the per-query results there doesn't seem to be any glaring slow-downs. No new results were flagged.

@ghost
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ghost commented Aug 3, 2018

CLA assistant check
All committers have signed the CLA.

@asger-semmle
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@xiemaisi to answer your question from before, I've run a full evaluation. I've included the links this time.

@xiemaisi xiemaisi self-requested a review August 3, 2018 15:45
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LGTM.

@xiemaisi xiemaisi merged commit d91218e into github:master Aug 6, 2018
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2 participants