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Always mark the string returned by File.realpath as tainted

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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
```

[Bug #15803]
This commit is contained in:
Jeremy Evans 2019-04-27 10:05:26 -07:00 • committed by Nobuyoshi Nakada
parent d47cd75b4f
commit a15f7dd1fb
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2 changed files with 2 additions and 2 deletions
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2
file.c
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@ -4270,7 +4270,7 @@ rb_check_realpath_internal(VALUE basedir, VALUE path, enum rb_realpath_mode mode
}
}
OBJ_INFECT(resolved, unresolved_path);
rb_obj_taint(resolved);
RB_GC_GUARD(unresolved_path);
RB_GC_GUARD(curdir);
return resolved;

2
test/ruby/test_file.rb
View file

@ -298,7 +298,7 @@ class TestFile < Test::Unit::TestCase
assert_predicate(File.realpath(base, dir), :tainted?)
base.untaint
dir.untaint
assert_not_predicate(File.realpath(base, dir), :tainted?)
assert_predicate(File.realpath(base, dir), :tainted?)
assert_predicate(Dir.chdir(dir) {File.realpath(base)}, :tainted?)
}
end