Summary: UploadWizard allows some kinds of resource exhaustion
           Product: MediaWiki extensions
           Version: any
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: UploadWizard

It is possible to mount an attack on the server by using UploadStash to:

- upload zillions of small files (# of files per directory)
- upload many very large files (disk usage)

Expiry can't happen in less than a few hours since it may actually take that
amount of time to upload some large videos.

Not easy to do this just by examining the file system, since temp files are
hashed up in directories, and aren't associated with a user or IP.

Simple solution:

- simple crontabs on the server to clean up temp files with a reasonable time
frame like anything older than 3 days

- guard methods on the UploadStash object to cycle out a user's old objects
when they have more than 100 abandoned temp files, or more than 100 total MB

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