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CPP: Make FunctionWithWrappers toCause work on builtins. #139

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Sep 4, 2018
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CPP: Make FunctionWithWrappers toCause work on builtins. #139

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7 changes: 6 additions & 1 deletion cpp/ql/src/semmle/code/cpp/security/FunctionWithWrappers.qll
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Original file line number Diff line number Diff line change
Expand Up @@ -3,9 +3,14 @@ import PrintfLike
private import TaintTracking

private
bindingset[index]
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Using bindingset makes the function inline, which can make it harder to predict how it'll be optimised in future contexts. Do these unnamed parameters at least have a Parameter object? Then you should be able to add exists(func.getParameter(index)) after the or and remove the bindingset annotation.

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I tried that and I didn't get the same results (and the test fails). I believe getParameter had no results.

Because this predicate is private, any non-local performance effects due to inlining should be localized to within this library.

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👍

string toCause(Function func, int index)
{
result = func.getQualifiedName() + "(" + func.getParameter(index).getName() + ")"
result = func.getQualifiedName() + "(" + func.getParameter(index).getName() + ")" or
(
not exists(func.getParameter(index).getName()) and
result = func.getQualifiedName() + "(arg " + index + ")"
)
}

/**
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