chakra-core/ChakraCore

Assertion failure in JavascriptArray.cpp

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#6,770 opened on Dec 24, 2021

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Description

the following poc cause a assertion failure in "debug" build on ubuntu.

function opt(){
	const v2 = [-1000000000.0];
	v2.length = 4294967295;
	const v3 = v2.copyWithin();
	return v3;
}


for(let i=0;i<0x200;i++){
	opt(false);
}

Contributor guide

Research direction
Analyze the copyWithin implementation in JavascriptArray.cpp to understand the assertion failure when length is set to 4294967295.
Tech stack
javascriptcpp
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
C++JavaScript engine internals
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30