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Date: Sun, 15 Sep 2024 20:19:10 +0200
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Subject: Re: readdir() returns inaccessible name if file was created with
 invalid UTF-8
To: cygwin AT cygwin DOT com
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From: Thomas Wolff via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Thomas Wolff <towo AT towo DOT net>
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Errors-To: cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com
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Am 15.09.2024 um 20:15 schrieb Thomas Wolff via Cygwin:
> Am 15.09.2024 um 19:47 schrieb Christian Franke via Cygwin:
>> If a file name contains an invalid (truncated) UTF-8 sequence, open()
>> does not refuse to create the file. Later readdir() returns a
>> different name which could not be used to access the file.
>>
>> Testcase with U+1F321 (Thermometer):
>>
>> $ uname -r
>> 3.5.4-1.x86_64
>>
>> $ printf $'\U0001F321' | od -A none -t x1
>>  f0 9f 8c a1
>>
>> $ touch 'file1-'$'\xf0\x9f\x8c\xa1''.ext'
>>
>> $ touch 'file2-'$'\xf0\x9f\x8c''.ext'
>>
>> $ touch 'file3-'$'\xf0\x9f\x8c'
>>
>> $ ls -1
>> ls: cannot access 'file2-.?ext': No such file or directory
>> ls: cannot access 'file3-': No such file or directory
>> 'file1-'$'\360\237\214\241''.ext'
>> file2-.?ext
>> file3-
> I don't reproduce this.
> While the file name gets mangled, all resulting file names are valid and
> listed:
> In file2 the sequence is turned into U+17B3 but exchanged with the dot.
> In file3 the same sequence is just dropped.
> $ ls -1|cat
> file1-🌡.ext
> file2-.ឳext
> file3-
>
> However, ls file2* fails, as does ls *.
On the other hand, ls file3- fails too, so some mapping error occurs
internally.
Also, the files cannot be deleted from cygwin (need to use cmd).

>
>>
>>
>> Name mapping according to "fhandler_disk_file::readdir" strace lines:
>>
>> "file1-\xF0\x9F\x8C\xA1.ext" -(open)-> L"file1-\xD83C\xDF21.ext"
>> -(readdir)->
>> "file1-\xF0\x9F\x8C\xA1.ext"
>>
>> "file2-\xF0\x9f\x8C.ext" -(open)-> L"file2-\xD83C\xF02Eext" -(readdir)->
>> "file2-.\xE1\x9E\xB3ext"
>>
>> "file3-\xF0\x9F\x8C" -(open)-> L"file3-\xD83C\xF000" -(readdir)->
>> "file3-"
>>
>> Issue found because 'stress-ng --filename ...' could not cleanup its
>> temp directory.
>>
>
>


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