Use Environment.IsPrivilegedProcess (#77847)

* Use Environment.IsPrivilegedProcess

* Remove using System

src/libraries/System.Diagnostics.Process/tests/ProcessTests.Unix.cs

@@ -656,7 +656,7 @@ private static string GetUserGroupIds(string username)
 
         private static string GetCurrentRealUserName()
         {
-            string realUserName = geteuid() == 0 ?
+            string realUserName = Environment.IsPrivilegedProcess ?
                 Environment.GetEnvironmentVariable("SUDO_USER") :
                 Environment.UserName;
 

src/libraries/System.Diagnostics.Tracing/tests/BasicEventSourceTest/TestEventCounter.Etw.cs

@@ -9,8 +9,7 @@ namespace BasicEventSourceTests
     public partial class TestEventCounter
     {
         // Specifies whether the process is elevated or not.
-        private static readonly Lazy<bool> s_isElevated = new Lazy<bool>(AdminHelpers.IsProcessElevated);
-        private static bool IsProcessElevated => s_isElevated.Value;
+        private static bool IsProcessElevated => Environment.IsPrivilegedProcess;
 
         [ConditionalFact(nameof(IsProcessElevated))]
         [ActiveIssue("https://github.com/dotnet/runtime/issues/25035")]

src/libraries/System.Diagnostics.Tracing/tests/BasicEventSourceTest/TestUtilities.cs

@@ -16,8 +16,7 @@ namespace BasicEventSourceTests
     internal class TestUtilities
     {
         // Specifies whether the process is elevated or not.
-        private static readonly Lazy<bool> s_isElevated = new Lazy<bool>(() => AdminHelpers.IsProcessElevated());
-        internal static bool IsProcessElevated => s_isElevated.Value;
+        internal static bool IsProcessElevated => Environment.IsPrivilegedProcess;
 
         /// <summary>
         /// Confirms that there are no EventSources running.

src/libraries/System.Diagnostics.Tracing/tests/BasicEventSourceTest/TestsManifestGeneration.Etw.cs

@@ -25,8 +25,7 @@ namespace BasicEventSourceTests
     public partial class TestsManifestGeneration
     {
         // Specifies whether the process is elevated or not.
-        private static readonly Lazy<bool> s_isElevated = new Lazy<bool>(AdminHelpers.IsProcessElevated);
-        private static bool IsProcessElevated => s_isElevated.Value;
+        private static bool IsProcessElevated => Environment.IsPrivilegedProcess;
         private static bool IsProcessElevatedAndNotWindowsNanoServerAndRemoteExecutorSupported =>
             IsProcessElevated && PlatformDetection.IsNotWindowsNanoServer && RemoteExecutor.IsSupported;
 

src/libraries/System.Diagnostics.Tracing/tests/BasicEventSourceTest/TestsWrite.Etw.cs

@@ -11,8 +11,7 @@ namespace BasicEventSourceTests
     public partial class TestsWrite
     {
         // Specifies whether the process is elevated or not.
-        private static readonly Lazy<bool> s_isElevated = new Lazy<bool>(AdminHelpers.IsProcessElevated);
-        private static bool IsProcessElevated => s_isElevated.Value;
+        private static bool IsProcessElevated => Environment.IsPrivilegedProcess;
         private static bool IsProcessElevatedAndNotWindowsNanoServer =>
             IsProcessElevated && PlatformDetection.IsNotWindowsNanoServer; // ActiveIssue: https://github.com/dotnet/runtime/issues/26197
 

src/libraries/System.Diagnostics.Tracing/tests/BasicEventSourceTest/TestsWriteEvent.Etw.cs

@@ -11,8 +11,7 @@ namespace BasicEventSourceTests
     partial class TestsWriteEvent
     {
         // Specifies whether the process is elevated or not.
-        private static readonly Lazy<bool> s_isElevated = new Lazy<bool>(AdminHelpers.IsProcessElevated);
-        private static bool IsProcessElevated => s_isElevated.Value;
+        private static bool IsProcessElevated => Environment.IsPrivilegedProcess;
         private static bool IsProcessElevatedAndNotWindowsNanoServer =>
             IsProcessElevated && PlatformDetection.IsNotWindowsNanoServer; // ActiveIssue: https://github.com/dotnet/runtime/issues/26197
 

src/libraries/System.Diagnostics.Tracing/tests/BasicEventSourceTest/TestsWriteEventToListener.Etw.cs

@@ -15,8 +15,7 @@ namespace BasicEventSourceTests
     public partial class TestsWriteEventToListener
     {
         // Specifies whether the process is elevated or not.
-        private static readonly Lazy<bool> s_isElevated = new Lazy<bool>(AdminHelpers.IsProcessElevated);
-        private static bool IsProcessElevated => s_isElevated.Value;
+        private static bool IsProcessElevated => Environment.IsPrivilegedProcess;
 
         [ConditionalFact(nameof(IsProcessElevated))]
         public void Test_WriteEvent_TransferEvents()

src/libraries/System.IO.Pipes/tests/NamedPipeTests/NamedPipeTest.CurrentUserOnly.Unix.cs

@@ -36,7 +36,7 @@ public NamedPipeTest_CurrentUserOnly_Unix(ITestOutputHelper output)
         public async Task Connection_UnderDifferentUsers_BehavesAsExpected(
             PipeOptions serverPipeOptions, PipeOptions clientPipeOptions, PipeDirection clientPipeDirection)
         {
-            bool isRoot = AdminHelpers.IsProcessElevated();
+            bool isRoot = Environment.IsPrivilegedProcess;
             if (clientPipeOptions == PipeOptions.CurrentUserOnly && isRoot)
             {
                 throw new SkipTestException("Current user is root, RemoteExecutor is unable to use a different user for CurrentUserOnly.");

src/libraries/System.IO.Pipes/tests/NamedPipeTests/NamedPipeTest.RunAsClient.Unix.cs

@@ -19,7 +19,7 @@ public class NamedPipeTest_RunAsClient
         [DllImport("libc", SetLastError = true)]
         internal static extern unsafe uint geteuid();
 
-        public static bool IsSuperUserAndRemoteExecutorSupported => geteuid() == 0 && RemoteExecutor.IsSupported;
+        public static bool IsSuperUserAndRemoteExecutorSupported => Environment.IsPrivilegedProcess && RemoteExecutor.IsSupported;
 
         [ConditionalFact(nameof(IsSuperUserAndRemoteExecutorSupported))]
         [PlatformSpecific(TestPlatforms.AnyUnix)]  // Uses P/Invokes

src/libraries/System.Net.Sockets/tests/FunctionalTests/CreateSocketTests.cs

@@ -40,7 +40,7 @@ public CreateSocket(ITestOutputHelper output)
             new object[] { SocketType.Unknown, ProtocolType.Udp },
         };
 
-        private static bool SupportsRawSockets => AdminHelpers.IsProcessElevated();
+        private static bool SupportsRawSockets => Environment.IsPrivilegedProcess;
         private static bool NotSupportsRawSockets => !SupportsRawSockets;
 
         [OuterLoop]
@@ -480,7 +480,7 @@ await Task.Run(async () =>
                         }
                     }
                 }
-            }).WaitAsync(TestSettings.PassingTestTimeout); 
+            }).WaitAsync(TestSettings.PassingTestTimeout);
         }
 
         [DllImport("libc")]

src/libraries/System.Security.Cryptography/tests/X509Certificates/X509StoreTests.Unix.cs

@@ -50,6 +50,6 @@ private void X509Store_MachineStoreLoadSkipsInvalidFiles()
             }, new RemoteInvokeOptions { StartInfo = psi }).Dispose();
         }
 
-        public static bool NotRunningAsRootAndRemoteExecutorSupported => Interop.Sys.GetEUid() != 0 && RemoteExecutor.IsSupported;
+        public static bool NotRunningAsRootAndRemoteExecutorSupported => !Environment.IsPrivilegedProcess && RemoteExecutor.IsSupported;
     }
 }

src/libraries/System.ServiceProcess.ServiceController/tests/TestServiceProvider.cs

@@ -17,19 +17,8 @@ internal sealed class TestServiceProvider
 
         private const int readTimeout = 60000;
 
-        private static readonly Lazy<bool> s_runningWithElevatedPrivileges = new Lazy<bool>(() =>
-        {
-            using WindowsIdentity currentIdentity = WindowsIdentity.GetCurrent();
-            return new WindowsPrincipal(currentIdentity).IsInRole(WindowsBuiltInRole.Administrator);
-        });
-
         private NamedPipeClientStream _client;
 
-        public static bool RunningWithElevatedPrivileges
-        {
-            get { return s_runningWithElevatedPrivileges.Value; }
-        }
-
         public NamedPipeClientStream Client
         {
             get