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ASF subversion and git services commented on LOG4J2-2650: --------------------------------------------------------- Commit e50c485380f23fb4c84173757c1808952b257d8b in logging-log4j2's branch refs/heads/master from Ralph Goers [ https://gitbox.apache.org/repos/asf?p=logging-log4j2.git;h=e50c485 ] LOG4J2-2650 - Support emulating a MAC address when using ipv6 > ArrayIndexOutOfBoundsException in the initialization of UuidUtil > ---------------------------------------------------------------- > > Key: LOG4J2-2650 > URL: https://issues.apache.org/jira/browse/LOG4J2-2650 > Project: Log4j 2 > Issue Type: Bug > Components: Core > Affects Versions: 2.12.0 > Environment: os : Mac OS > java: 1.8 (jdk1.8.0_172.jdk) > none network interfaces connected > Reporter: Mattia Bertorello > Priority: Major > Time Spent: 1h > Remaining Estimate: 0h > > Hi, > I found a problem in the UuidUtil initialization. > The code that generate the exception > {code:java} > private static Logger log = LogManager.getLogger(MyClass.class); > {code} > This code return a ip address of localhost and when the stack is IPv4 return > 4 bytes but when the default stack is IPv6 it's going to return 16 bytes. > > [NetUtils.java#L108|https://github.com/apache/logging-log4j2/blob/da539329d528d979f4dd385a6ebb639793ef37bd/log4j-core/src/main/java/org/apache/logging/log4j/core/util/NetUtils.java#L108] > {code:java} > if (mac == null || mac.length == 0) { > mac = localHost.getAddress(); > } > {code} > This is the part that generate the ArrayIndexOutOfBoundsException > > [UuidUtil.java#L81|https://github.com/apache/logging-log4j2/blob/da539329d528d979f4dd385a6ebb639793ef37bd/log4j-core/src/main/java/org/apache/logging/log4j/core/util/UuidUtil.java#L81] > {code:java} > System.arraycopy(mac, index, node, index + 2, length);{code} > These 16 bytes will generate a wrong destination index that exceed the length > of the node array. > {noformat} > mac = {byte[16]@3217} > length = 6 > index = 10 > node = {byte[8]@3222} > {noformat} > This is the complete exception > {code} > java.lang.ExceptionInInitializerError at > org.apache.logging.log4j.core.util.WatchManager.<init>(WatchManager.java:53) > at > org.apache.logging.log4j.core.config.AbstractConfiguration.<init>(AbstractConfiguration.java:135) > at > org.apache.logging.log4j.core.config.NullConfiguration.<init>(NullConfiguration.java:32) > at > org.apache.logging.log4j.core.LoggerContext.<clinit>(LoggerContext.java:79) > at > org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.createContext(ClassLoaderContextSelector.java:171) > at > org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.locateContext(ClassLoaderContextSelector.java:145) > at > org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.getContext(ClassLoaderContextSelector.java:70) > at > org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.getContext(ClassLoaderContextSelector.java:57) > at > org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:148) > at > org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:45) > at org.apache.logging.log4j.LogManager.getContext(LogManager.java:194) at > org.apache.logging.log4j.LogManager.getLogger(LogManager.java:581) at > cc.arduino.contributions.packages.ContributionInstaller.<clinit>(ContributionInstaller.java:66) > at processing.app.Base.<init>(Base.java:291) at > processing.app.Base.main(Base.java:150) Caused by: > java.lang.ArrayIndexOutOfBoundsException at java.lang.System.arraycopy(Native > Method) at > org.apache.logging.log4j.core.util.UuidUtil.<clinit>(UuidUtil.java:81) ... 15 > more > {code} > To reproduce the exception you need > * disconnect every network interface > * verify that java will use the IPv6 stack -Djava.net.preferIPv4Stack=false > -Djava.net.preferIPv6Addresses=true > * Initialize a log of log4j > I suggest different solution: > - Remove > [NetUtils.java#L108|https://github.com/apache/logging-log4j2/blob/da539329d528d979f4dd385a6ebb639793ef37bd/log4j-core/src/main/java/org/apache/logging/log4j/core/util/NetUtils.java#L108] > and return always null (when the other code fail to init the mac variable ) > because in general the method is called getMacAddress but in that particular > case will return and IP address > - Mange the IPv6 case in the static part of the class UuidUtil > [UuidUtil.java#L81|https://github.com/apache/logging-log4j2/blob/da539329d528d979f4dd385a6ebb639793ef37bd/log4j-core/src/main/java/org/apache/logging/log4j/core/util/UuidUtil.java#L81] -- This message was sent by Atlassian JIRA (v7.6.14#76016)