External predicate recording multiple values

[jghebre]

Hi,

I'm using an external predicate to read in csv data and apply these to the overrided predicate step in DataFlow::SharedFlowStep. This is nice because it allows me to make changes to the entire Dataflow easily, which is what I want.

This works, but for certain queries I get this error:

Oops! A fatal internal error occurred. Details:
java.lang.IllegalStateException: Tried to record two values for the extensional patchInfo. Old value: {[0, 29, foo, example.js, 5, example.js, false]}. New value: {[0, 29, foo, example.js, 5, example.js, false]}
        at com.semmle.api.backend.ExtensionalValuesBase.put(ExtensionalValuesBase.java:82)
        at com.semmle.cli2.execute.ExecuteQueriesCommand.loadExtensionals(ExecuteQueriesCommand.java:395)
        at com.semmle.cli2.execute.ExecuteQueriesCommand$ExecutionIterator.startImpl(ExecuteQueriesCommand.java:235)
        at com.semmle.cli2.execute.ExecuteQueriesCommand$ExecutionIterator.start(ExecuteQueriesCommand.java:192)
        at com.semmle.cli2.execute.ExecuteQueriesCommand$ExecutionIterator.lambda$next$0(ExecuteQueriesCommand.java:187)
        at com.semmle.util.concurrent.FutureUtils.supplyCompose(FutureUtils.java:248)
        at com.semmle.util.concurrent.Paralleliser.lambda$startMoreJobs$3(Paralleliser.java:109)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.base/java.lang.Thread.run(Unknown Source)

I'm pretty positive this is occurring due to another file using DataFlow::SharedFlowStep::step which hits the external predicate more than once and causes errors.

I'm not sure if there is a way around this by perhaps:

• only loading the external predicate once
• forcing my class that overrides DataFlow::SharedFlowStep::step to run last
  or some other fix.

Thanks!

[mbg]

Hi @jghebre 👋🏻

Do you have a minimal example for where this happens? (I.e. combination of CSV data and queries.) Also, can you confirm that you are using the most recent version of CodeQL? That would help us troubleshoot this.

[jghebre]

Hi @mbg ,

Sure I cut down my libraries to a minimal example, I'm using the latest CodeQL, v2.20.7:

Library for holding the csv data
PatchData.qll:

/**
 * Module to store patch data.
 */
module PatchData {
    // Some tabular data
    external predicate patchInfo(
      int id, int info
    );
  }

Library for using the csv data in Dataflow
PatchDataflow.qll:

import javascript
private import queries.lib.PatchData
  // use the tabular data to patch dataflow
  class Example extends DataFlow::SharedFlowStep {
    override predicate step(DataFlow::Node nodeFrom, DataFlow::Node nodeTo) {
      exists(int id |
        PatchData::patchInfo(id, _) 
      )
    }
  }

CWE-020 query with PatchDataflow library added
UntrustedDataToExternalAPI.qll:

/**
 * @name Untrusted data passed to external API
 * @description Data provided remotely is used in this external API without sanitization, which could be a security risk.
 * @id js/untrusted-data-to-external-api
 * @kind path-problem
 * @precision low
 * @problem.severity error
 * @security-severity 7.8
 * @tags security external/cwe/cwe-20
 */

// Add the library to patch dataflow
import queries.lib.PatchDataflow

import javascript
import semmle.javascript.security.dataflow.ExternalAPIUsedWithUntrustedDataQuery
import ExternalAPIUsedWithUntrustedDataFlow::PathGraph

from
  ExternalAPIUsedWithUntrustedDataFlow::PathNode source,
  ExternalAPIUsedWithUntrustedDataFlow::PathNode sink
where ExternalAPIUsedWithUntrustedDataFlow::flowPath(source, sink)
select sink, source, sink,
  "Call to " + sink.getNode().(Sink).getApiName() + " with untrusted data from $@.", source,
  source.toString()

Example csv
test.csv:

0,29

query used to run

codeql database analyze --format=sarif-latest --external=patchInfo=test.csv --output test.sarif test-db UntrustedDataToExternalAPI.ql --threads=0 --rerun

error message:

Oops! A fatal internal error occurred. Details:
java.lang.IllegalStateException: Tried to record two values for the extensional patchInfo. Old value: {[0, 29]}. New value: {[0, 29]}
        at com.semmle.api.backend.ExtensionalValuesBase.put(ExtensionalValuesBase.java:82)
        at com.semmle.cli2.execute.ExecuteQueriesCommand.loadExtensionals(ExecuteQueriesCommand.java:395)
        at com.semmle.cli2.execute.ExecuteQueriesCommand$ExecutionIterator.startImpl(ExecuteQueriesCommand.java:235)
        at com.semmle.cli2.execute.ExecuteQueriesCommand$ExecutionIterator.start(ExecuteQueriesCommand.java:192)
        at com.semmle.cli2.execute.ExecuteQueriesCommand$ExecutionIterator.lambda$next$0(ExecuteQueriesCommand.java:187)
        at com.semmle.util.concurrent.FutureUtils.supplyCompose(FutureUtils.java:248)
        at com.semmle.util.concurrent.Paralleliser.lambda$startMoreJobs$3(Paralleliser.java:109)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.base/java.lang.Thread.run(Unknown Source)

[mbg]

Thanks for that, @jghebre! That's really useful. I can confirm that I get the same error with your minimal example. I'll pass this on to the relevant engineering team.

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