[ 
https://issues.apache.org/jira/browse/SPARK-15165?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Davies Liu resolved SPARK-15165.
--------------------------------
    Resolution: Fixed

> Codegen can break because toCommentSafeString is not actually safe
> ------------------------------------------------------------------
>
>                 Key: SPARK-15165
>                 URL: https://issues.apache.org/jira/browse/SPARK-15165
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 1.5.2, 1.6.1, 2.0.0
>            Reporter: Kousuke Saruta
>            Assignee: Kousuke Saruta
>            Priority: Blocker
>             Fix For: 2.0.0
>
>
> toCommentSafeString method replaces "\u" with "\ \u" to avoid codegen 
> breaking.
> But if the even number of "\" is put before "u", like "\ \u", in the string 
> literal in the query, codegen can break.
> Following code causes compilation error.
> {code}
> val df = Seq(...).toDF
> df.select("'\\\\\\\\u002A/'").show
> {code}
> The reason of the compilation error is because "\\\\\\\\u002A/" is translated 
> into "*/" (the end of comment). 
> Due to this unsafety, arbitrary code can be injected like as follows.
> {code}
> val df = Seq(...).toDF
> // Inject "System.exit(1)"
> df.select("'\\\\\\\\u002A/{System.exit(1);}/*'").show
> {code}



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org
For additional commands, e-mail: issues-h...@spark.apache.org

Reply via email to