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Add billion laughs attack to test suite #197

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Mar 19, 2018
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Add billion laughs attack to test suite #197

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36 changes: 36 additions & 0 deletions jvm/src/test/scala/scala/xml/BillionLaughsAttackTest.scala
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package scala.xml

import org.junit.Test

class BillionLaughsAttackTest {

/**
* org.xml.sax.SAXParseException: JAXP00010001: The parser has
* encountered more than "64000" entity expansions in this document;
* this is the limit imposed by the JDK.
*/
@Test(expected=classOf[org.xml.sax.SAXParseException])
def lolzTest: Unit = {
XML.loadString(lolz)
}

// Copied from https://msdn.microsoft.com/en-us/magazine/ee335713.aspx
val lolz =
"""<?xml version="1.0"?>
|<!DOCTYPE lolz [
| <!ENTITY lol "lol">
| <!ELEMENT lolz (#PCDATA)>
| <!ENTITY lol1 "&lol;&lol;&lol;&lol;&lol;&lol;&lol;&lol;&lol;&lol;">
| <!ENTITY lol2 "&lol1;&lol1;&lol1;&lol1;&lol1;&lol1;&lol1;&lol1;&lol1;&lol1;">
| <!ENTITY lol3 "&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;">
| <!ENTITY lol4 "&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;">
| <!ENTITY lol5 "&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;">
| <!ENTITY lol6 "&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;">
| <!ENTITY lol7 "&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;">
| <!ENTITY lol8 "&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;">
| <!ENTITY lol9 "&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;">
|]>
|<lolz>&lol9;</lolz>
|""".stripMargin

}