Fixes #1889

LibreHardwareMonitorLib/Hardware/Mutexes.cs

@@ -1,4 +1,6 @@
 using System;
+using System.Security.AccessControl;
+using System.Security.Principal;
 using System.Threading;
 
 namespace LibreHardwareMonitor.Hardware;
@@ -24,7 +26,15 @@ internal static class Mutexes
         {
             try
             {
-                return new Mutex(false, name);
+                var worldRule = new MutexAccessRule(new SecurityIdentifier(WellKnownSidType.WorldSid, null), MutexRights.FullControl, AccessControlType.Allow);
+                var mutexSecurity = new MutexSecurity();
+                mutexSecurity.AddAccessRule(worldRule);
+
+#if NETFRAMEWORK
+                return new Mutex(false, name, out _, mutexSecurity);
+#else
+                return MutexAcl.Create(false, name, out _, mutexSecurity);
+#endif
             }
             catch (UnauthorizedAccessException)
             {

LibreHardwareMonitorLib/LibreHardwareMonitorLib.csproj

@@ -50,6 +50,7 @@
     <PackageReference Include="HidSharp" Version="2.6.2" />
     <PackageReference Include="RAMSPDToolkit-NDD" Version="1.3.2" />
     <PackageReference Include="System.Management" Version="9.0.9" />
+    <PackageReference Include="System.Threading.AccessControl" Version="9.0.9" />
   </ItemGroup>
   <ItemGroup>
     <None Include="Resources\packageicon.png" PackagePath="">

LibreHardwareMonitorLib/PawnIo/RyzenSmu.cs

@@ -13,6 +13,7 @@ public class RyzenSmu
             throw new TimeoutException("Timeout waiting for PCI bus mutex");
 
         uint version;
+
         try
         {
             long[] outArray = _pawnIO.Execute("ioctl_get_smu_version", [], 1);
@@ -34,8 +35,18 @@ public class RyzenSmu
 
     public long[] ReadPmTable(int size)
     {
-        long[] outArray = _pawnIO.Execute("ioctl_read_pm_table", [], size);
-        return outArray;
+        if (!Mutexes.WaitPciBus(5000))
+            throw new TimeoutException("Timeout waiting for PCI bus mutex");
+
+        try
+        {
+            long[] outArray = _pawnIO.Execute("ioctl_read_pm_table", [], size);
+            return outArray;
+        }
+        finally
+        {
+            Mutexes.ReleasePciBus();
+        }
     }
 
     public void UpdatePmTable()