Description
Description
When trying to enumerate the C drive of the Windows host in WSL 2, the enumeration aborts with an UnauthorizedAccessException as soon as it hits certain entries, for example DumpStack.log.tmp, hiberfil.sys, pagefile.sys or swapfile.sys.
Reproduction Steps
namespace WslFileSystemException;
static class Program
{
static void Main(string[] args)
{
var dir = new DirectoryInfo(args.SingleOrDefault("/mnt/c"));
// Simple reproduction
Console.WriteLine($"Trying to list {dir.FullName}");
foreach (var info in dir.EnumerateFileSystemInfos())
Console.WriteLine(info.Name);
}
}
Expected behavior
The directory is listed, returning an Entry object for each entry in the file system.
Actual behavior
Unhandled exception. System.UnauthorizedAccessException: Access to the path '/mnt/c/DumpStack.log.tmp' is denied.
---> System.IO.IOException: Permission denied
--- End of inner exception stack trace ---
at System.IO.FileStatus.ThrowOnCacheInitializationError(ReadOnlySpan`1 path)
at System.IO.FileSystemInfo.Create(String fullPath, String fileName, Boolean asDirectory, FileStatus& fileStatus)
at System.IO.Enumeration.FileSystemEnumerator`1.MoveNext()
at WslFileSystemException.Program.Main(String[] args) in /mnt/d/WorkingCopies/playgrounds/SinglePlaygrounds/WslFileSystemException/Program.cs:line 11
Regression?
No response
Known Workarounds
Wrap the enumeration in your own code, catching the exception in the MoveNext()-Method, and resume iteration. (Relying on this behavior might be a violation of the iterator protocol, but it seems to work for now. The "forbidden" entries are skipped, but the rest of the drive contents show up.)
using var enumerator = dir.EnumerateFileSystemInfos().GetEnumerator();
while (true)
{
try
{
if (!enumerator.MoveNext())
break;
Console.WriteLine(enumerator.Current.Name);
}
catch (UnauthorizedAccessException ex)
{
Console.WriteLine($"Caught {ex.Message}, trying to resume...");
}
}
[...]
OneDriveTemp
Caught Access to the path '/mnt/c/pagefile.sys' is denied., trying to resume...
PerfLogs
Program Files
Program Files (x86)
ProgramData
Programme
Recovery
Caught Access to the path '/mnt/c/swapfile.sys' is denied., trying to resume...
System Volume Information
[...]
Configuration
WSL-Version: 2.3.26.0
Kernelversion: 5.15.167.4-1
WSLg-Version: 1.0.65
MSRDC-Version: 1.2.5620
Direct3D-Version: 1.611.1-81528511
DXCore-Version: 10.0.26100.1-240331-1435.ge-release
Windows-Version: 10.0.19045.5371
/proc/version: Linux version 5.15.167.4-microsoft-standard-WSL2 (root@f9c826d3017f) (gcc (GCC) 11.2.0, GNU ld (GNU Binutils) 2.37) #1 SMP Tue Nov 5 00:21:55 UTC 2024
Ubuntu 22.04.5 LTS
Dotnet 9.0.102 (but also reproducible with .NET 8)
Other information
The 'ls' command in Linux also has problems showing the entries, but at least it doesn't fail completely. The entries in question show up as:
-????????? ? ? ? ? ? DumpStack.log.tmp
-????????? ? ? ? ? ? hiberfil.sys
-????????? ? ? ? ? ? pagefile.sys
-????????? ? ? ? ? ? swapfile.sys