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Napalys/regexp unknown flags #18089

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@Napalys Napalys commented Nov 25, 2024

This pull request fixes an issue where queries were only handling regular expressions with known flags, overlooking unknown flags. Now, it correctly deals with unknown flags in regular expressions.

Additionally, some queries in the JavaScript code were only working with literal regular expressions. Now, they work with both literals and RegExp objects. Notable updates include:

  • javascript/ql/lib/semmle/javascript/security/IncompleteBlacklistSanitizer.qll
  • javascript/ql/lib/semmle/javascript/security/dataflow/TaintedPathCustomizations.qll
  • javascript/ql/src/Security/CWE-116/IncompleteSanitization.ql

@github-actions github-actions bot added the JS label Nov 25, 2024
… from RegExpCreationNode and reused RegExp::isGlobal in std
Comment on lines 122 to 125
/**
* Holds if this is a global replacement, that is, the first argument is a regular expression
* with the `g` flag, or this is a call to `.replaceAll()`.
*/
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This docstring needs to mention that the predicate also holds if the flags are unknown.
Incorporate that into the string naturally in some way.
(Actually, try to copy-paste the above sentence into Copilot as instructions, use o1-mini or o1-preview with the Copilot edit mode: Select the docstring in VSCode, press cmd + i, make sure to select the right model, and paste my above instructions).

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@Napalys Napalys Nov 26, 2024

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Fixed 56cde75

Comment on lines 1685 to 1687
/** Holds if the constructed predicate has the `g` flag. */
predicate isGlobal() { RegExp::isGlobal(this.getFlags()) }

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Don't outright delete predicates like this. Instead keep the implementation but add a deprecated annotation, and add an explanation into the docstring as to why a predicate is deprecated.

Deprecated predicates gets deleted after a little over a year.

… longer flagged as bad sanitization to reduce false positives.
@Napalys Napalys force-pushed the napalys/regexp-unknown-flags branch 2 times, most recently from c003a81 to b6ffc46 Compare November 27, 2024 11:12
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2 participants