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The code places no upper bounds on the memory space required to execute the program. Consequently, the program can easily exhaust the available heap space in two ways. First, an attacker can supply arbitrarily many lines in the file, causing the vector to grow until memory is exhausted. Second, an attacker can simply supply an arbitrarily long line, causing the {{readLine()}} method to exhaust memory. According to the Java API documentation \[[API 2006|AA. Bibliography#APIReferences#API 06]\], the {{BufferedReader.readLine()}} method |
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In a server-class machine using a parallel garbage collector, the default initial and maximum heap sizes are as follows for Java SE 6 \[[Sun 2006|AA. Bibliography#SunReferences#Sun 06]\]: |
- initial heap size: larger of 1/64 of the machine's physical memory or some reasonable minimum.
- maximum heap size: smaller of 1/4 of the physical memory or 1GB.
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The {{OutOfMemoryError}} can be avoided by ensuring the absence of infinite loops, memory leaks, and unnecessary object retention. When memory requirements are known ahead of time, the heap size can be tailored to fit the requirements using the following runtime parameters \[[Java 2006|AA. Bibliography#JavaReferences#Java 06]\]: |
java -Xms<initial heap size> -Xmx<maximum heap size>
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CWE-400. Uncontrolled resource consumption ("resource exhaustion") | ||||
| CWE-770. Allocation of resources without limits or throttling |
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<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="550875d965907c8b-fc355c1a-487649a6-8446a016-d57f9d465104c0d9b2fc97a6"><ac:plain-text-body><![CDATA[ | [[API 2006 | AA. Bibliography#API References#API 06]] | Class | ]]></ac:plain-text-body></ac:structured-macro> | |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="b240bf9a4e56c26a-4572df15-4780461c-a826a909-25d93108c79fa51d31626038"><ac:plain-text-body><![CDATA[ | [[Java 2006 | AA. Bibliography#Java References#Java 06]] | [java – The Java application launcher | http://java.sun.com/javase/6/docs/technotes/tools/windows/java.html], Syntax for increasing the heap size | ]]></ac:plain-text-body></ac:structured-macro> |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="12f3a4d5ad5c377d-1ac7fbd6-43454f93-b2aca470-394a11f4df6959e515f3f353"><ac:plain-text-body><![CDATA[ | [[SDN 2008 | AA. Bibliography#SDN References#SDN 08]] | [Serialization FAQ | http://java.sun.com/javase/technologies/core/basic/serializationFAQ.jsp] | ]]></ac:plain-text-body></ac:structured-macro> |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="ab2e82c8083d4ff8-3664312a-4d3b46d8-a1209b73-0c176abbf639335993346969"><ac:plain-text-body><![CDATA[ | [[Sun 2003 | AA. Bibliography#Sun References#Sun 03]] | Chapter 5, Tuning the Java Runtime System, [Tuning the Java Heap | http://docs.sun.com/source/817-2180-10/pt_chap5.html#wp57027] | ]]></ac:plain-text-body></ac:structured-macro> |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="5690bb1cb9afcaea-3698a324-446c40d0-a428b1a3-16003077700981478eee6def"><ac:plain-text-body><![CDATA[ | [[Sun 2006 | AA. Bibliography#Sun References#Sun 06]] | [Garbage Collection Ergonomics | http://java.sun.com/javase/6/docs/technotes/guides/vm/gc-ergonomics.html ], Default values for the Initial and Maximum Heap Size | ]]></ac:plain-text-body></ac:structured-macro> |
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