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Commitcd6b4d8

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pwshBotdaxian-dbwTravisEz13
authored
[release/v7.5] Set standard handles explicitly when starting a process with-NoNewWindow (#25324)
Co-authored-by: Dongbo Wang <dongbow@microsoft.com>Co-authored-by: Travis Plunk <travis.plunk@microsoft.com>
1 parent8249040 commitcd6b4d8

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2 files changed

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-6
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2 files changed

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‎src/Microsoft.PowerShell.Commands.Management/commands/management/Process.cs

Lines changed: 38 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -1677,7 +1677,7 @@ public SwitchParameter LoadUserProfile
16771677
privateSwitchParameter_loaduserprofile=SwitchParameter.Present;
16781678

16791679
/// <summary>
1680-
/// Starts process ina new window.
1680+
/// Starts process inthe current console window.
16811681
/// </summary>
16821682
[Parameter(ParameterSetName="Default")]
16831683
[Alias("nnw")]
@@ -1965,7 +1965,9 @@ protected override void BeginProcessing()
19651965

19661966
startInfo.WindowStyle=_windowstyle;
19671967

1968-
if(_nonewwindow)
1968+
// When starting a process as another user, the 'CreateNoWindow' property value is ignored and a new window is created.
1969+
// See details at https://learn.microsoft.com/dotnet/api/system.diagnostics.processstartinfo.createnowindow?view=net-9.0#remarks
1970+
if(_nonewwindow&&_credentialisnull)
19691971
{
19701972
startInfo.CreateNoWindow=_nonewwindow;
19711973
}
@@ -2413,33 +2415,60 @@ private static byte[] ConvertEnvVarsToByteArray(StringDictionary sd)
24132415

24142416
privatevoidSetStartupInfo(ProcessStartInfostartinfo,refProcessNativeMethods.STARTUPINFOlpStartupInfo,refintcreationFlags)
24152417
{
2416-
boolhasRedirection=false;
2418+
// If we are starting a process using the current console window, we need to set its standard handles
2419+
// explicitly when they are not redirected because otherwise they won't be set and the new process will
2420+
// fail with the "invalid handle" error.
2421+
//
2422+
// However, if we are starting a process with a new console window, we should not explicitly set those
2423+
// standard handles when they are not redirected, but instead let Windows figure out the default to use
2424+
// when creating the process. Otherwise, the standard input handles of the current window and the new
2425+
// window will get weirdly tied together and cause problems.
2426+
boolhasRedirection=startinfo.CreateNoWindow
2427+
||_redirectstandardinputis notnull
2428+
||_redirectstandardoutputis notnull
2429+
||_redirectstandarderroris notnull;
2430+
24172431
// RedirectionStandardInput
24182432
if(_redirectstandardinput!=null)
24192433
{
2420-
hasRedirection=true;
24212434
startinfo.RedirectStandardInput=true;
24222435
_redirectstandardinput=ResolveFilePath(_redirectstandardinput);
24232436
lpStartupInfo.hStdInput=GetSafeFileHandleForRedirection(_redirectstandardinput,FileMode.Open);
24242437
}
2438+
elseif(startinfo.CreateNoWindow)
2439+
{
2440+
lpStartupInfo.hStdInput=newSafeFileHandle(
2441+
ProcessNativeMethods.GetStdHandle(-10),
2442+
ownsHandle:false);
2443+
}
24252444

24262445
// RedirectionStandardOutput
24272446
if(_redirectstandardoutput!=null)
24282447
{
2429-
hasRedirection=true;
24302448
startinfo.RedirectStandardOutput=true;
24312449
_redirectstandardoutput=ResolveFilePath(_redirectstandardoutput);
24322450
lpStartupInfo.hStdOutput=GetSafeFileHandleForRedirection(_redirectstandardoutput,FileMode.Create);
24332451
}
2452+
elseif(startinfo.CreateNoWindow)
2453+
{
2454+
lpStartupInfo.hStdOutput=newSafeFileHandle(
2455+
ProcessNativeMethods.GetStdHandle(-11),
2456+
ownsHandle:false);
2457+
}
24342458

24352459
// RedirectionStandardError
24362460
if(_redirectstandarderror!=null)
24372461
{
2438-
hasRedirection=true;
24392462
startinfo.RedirectStandardError=true;
24402463
_redirectstandarderror=ResolveFilePath(_redirectstandarderror);
24412464
lpStartupInfo.hStdError=GetSafeFileHandleForRedirection(_redirectstandarderror,FileMode.Create);
24422465
}
2466+
elseif(startinfo.CreateNoWindow)
2467+
{
2468+
lpStartupInfo.hStdError=newSafeFileHandle(
2469+
ProcessNativeMethods.GetStdHandle(-12),
2470+
ownsHandle:false);
2471+
}
24432472

24442473
if(hasRedirection)
24452474
{
@@ -2881,6 +2910,9 @@ internal struct JOBOBJECT_BASIC_PROCESS_ID_LIST
28812910

28822911
internalstaticclassProcessNativeMethods
28832912
{
2913+
[DllImport(PinvokeDllNames.GetStdHandleDllName,SetLastError=true)]
2914+
publicstaticexternIntPtrGetStdHandle(intwhichHandle);
2915+
28842916
[DllImport(PinvokeDllNames.CreateProcessWithLogonWDllName,CharSet=CharSet.Unicode,SetLastError=true,ExactSpelling=true)]
28852917
[return:MarshalAs(UnmanagedType.Bool)]
28862918
internalstaticexternboolCreateProcessWithLogonW(stringuserName,

‎test/powershell/Modules/Microsoft.PowerShell.Management/Start-Process.Tests.ps1

Lines changed: 14 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -241,3 +241,17 @@ Describe "Environment Tests" -Tags "Feature" {
241241
}
242242
}
243243
}
244+
245+
Describe"Bug fixes"-Tags"CI" {
246+
247+
## https://github.com/PowerShell/PowerShell/issues/24986
248+
It"Error redirection along with '-NoNewWindow' should work for Start-Process"-Skip:(!$IsWindows) {
249+
$errorFile=Join-Path-Path$TestDrive-ChildPath error.txt
250+
$out= pwsh-noprofile-c"Start-Process -Wait -NoNewWindow -RedirectStandardError$errorFile -FilePath cmd -ArgumentList '/C echo Hello'"
251+
252+
## 'Hello' should be sent to standard output; 'error.txt' file should be created but empty.
253+
$out| Should-BeExactly"Hello"
254+
Test-Path-Path$errorFile| Should-BeTrue
255+
(Get-Item$errorFile).Length| Should-Be0
256+
}
257+
}

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