Issue #15803 has been reported by jeremyevans0 (Jeremy Evans).

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Bug #15803: File.realpath should always return a tainted string
https://bugs.ruby-lang.org/issues/15803

* Author: jeremyevans0 (Jeremy Evans)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.7.0dev (2019-04-28 realpath-taint a1b4816759) [x86_64-openbsd]
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
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This string can include elements that were not in either string
passed to File.realpath, even if one of the strings is an
absolute path, due to symlinks:

```ruby
Dir.mkdir('b') unless File.directory?('b')
File.write('b/a', '') unless File.file?('b/a')
File.symlink('b', 'c') unless File.symlink?('c')
path = File.realpath('c/a'.untaint, Dir.pwd.untaint)
path # "/home/testr/ruby/b/a"
path.tainted? # should be true, as 'b' comes from file system
```

---Files--------------------------------
realpath-taint.patch (1.65 KB)


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