[jira] [Commented] (ARROW-16202) [C++][Parquet] WipeOutDecryptionKeys doesn't securely wipe out keys

["Antoine Pitrou (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-16202?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17522371#comment-17522371 ] 

Antoine Pitrou commented on ARROW-16202:
----------------------------------------

cc @mayaa [~itamarst]

> [C++][Parquet] WipeOutDecryptionKeys doesn't securely wipe out keys
> -------------------------------------------------------------------
>
>                 Key: ARROW-16202
>                 URL: https://issues.apache.org/jira/browse/ARROW-16202
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++, Parquet
>    Affects Versions: 7.0.0
>            Reporter: Antoine Pitrou
>            Priority: Critical
>             Fix For: 8.0.0
>
>
> {{InternalFileDecryptor::WipeOutDecryptionKeys()}} merely call {{std::string::clear}} to dispose of the decryption key contents, but that method is not guaranteed to clear memory (it probably doesn't, actually).
> We should probably devise a portable wrapper function for the various OS-specific memory clearing utilities.



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