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dotnet security : FileIOPermission throws System.ExecutionEngineException
1. Does your code apply any stack walk modifiers (Assert, PermitOnly, or Deny)? 2. If you replace the FileIOPermission demand by the unmanaged code demand (i.e.: run the latter from the same place in your code as the former), do you still get the exception? 3. Would you mind providing the full exception details, retrieved via its ToString method? [quoted text, click to view] "Andreas Håkansson" <andreas.hakansson@nospam.com> wrote in message news:eSclLYWoEHA.3464@tk2msftngp13.phx.gbl... >I can add to the equation that about 10 lines further down the code I > perform the following check > > Dim UnmanagedPerm As SecurityPermission = _ > New SecurityPermission(SecurityPermissionFlag.UnmanagedCode) > UnmanagedPerm.Demand() > > Without any problems. I have disabaled the FileIO security check pending > some feedback, thus I know that this code is executed flawless =/ > > And if it is of any help, the code I'm working on is controlled by VSS. > > //Andreas > > > "Andreas Håkansson" <andreas.hakansson@nospam.com> skrev i meddelandet > news:%23g9wlUWoEHA.3988@tk2msftngp13.phx.gbl... >> While working at a small application, and trying to be a good .net >> citizen I perform >> a check to see if the executing code has permission to work with files in >> a specific >> directory, like this >> >> Dim FilePerm As FileIOPermission = _ >> New FileIOPermission(FileIOPermissionAccess.AllAccess, >> Path.GetDirectoryName(FileName)) >> FilePerm.Demand() >> >> However, when the code hits the call to the Demand method it throws an >> ExecutionEngineException with the message >> >> "Unable to retrieve security descriptor for this frame." >> >> The application is a WinForm application and in the Main method I assign >> the >> current users principal to the current thread like this >> >> Shared Sub main() >> >> Dim WinUser As WindowsIdentity = _ >> WindowsIdentity.GetCurrent() >> Dim WinPrincipal As New WindowsPrincipal(WinUser) >> System.Threading.Thread.CurrentThread.CurrentPrincipal = >> WinPrincipal >> >> Dim main As New MainForm >> Application.Run(main) >> >> End Sub >> >> Any ideas to the reason for this? >> >> //Andreas >> > >
While working at a small application, and trying to be a good .net citizen I
perform a check to see if the executing code has permission to work with files in a specific directory, like this Dim FilePerm As FileIOPermission = _ New FileIOPermission(FileIOPermissionAccess.AllAccess, Path.GetDirectoryName(FileName)) FilePerm.Demand() However, when the code hits the call to the Demand method it throws an ExecutionEngineException with the message "Unable to retrieve security descriptor for this frame." The application is a WinForm application and in the Main method I assign the current users principal to the current thread like this Shared Sub main() Dim WinUser As WindowsIdentity = _ WindowsIdentity.GetCurrent() Dim WinPrincipal As New WindowsPrincipal(WinUser) System.Threading.Thread.CurrentThread.CurrentPrincipal = WinPrincipal Dim main As New MainForm Application.Run(main) End Sub Any ideas to the reason for this? //Andreas
I can add to the equation that about 10 lines further down the code I
perform the following check Dim UnmanagedPerm As SecurityPermission = _ New SecurityPermission(SecurityPermissionFlag.UnmanagedCode) UnmanagedPerm.Demand() Without any problems. I have disabaled the FileIO security check pending some feedback, thus I know that this code is executed flawless =/ And if it is of any help, the code I'm working on is controlled by VSS. //Andreas "Andreas Håkansson" <andreas.hakansson@nospam.com> skrev i meddelandet news:%23g9wlUWoEHA.3988@tk2msftngp13.phx.gbl... [quoted text, click to view] > While working at a small application, and trying to be a good .net citizen > I perform > a check to see if the executing code has permission to work with files in > a specific > directory, like this > > Dim FilePerm As FileIOPermission = _ > New FileIOPermission(FileIOPermissionAccess.AllAccess, > Path.GetDirectoryName(FileName)) > FilePerm.Demand() > > However, when the code hits the call to the Demand method it throws an > ExecutionEngineException with the message > > "Unable to retrieve security descriptor for this frame." > > The application is a WinForm application and in the Main method I assign > the > current users principal to the current thread like this > > Shared Sub main() > > Dim WinUser As WindowsIdentity = _ > WindowsIdentity.GetCurrent() > Dim WinPrincipal As New WindowsPrincipal(WinUser) > System.Threading.Thread.CurrentThread.CurrentPrincipal = > WinPrincipal > > Dim main As New MainForm > Application.Run(main) > > End Sub > > Any ideas to the reason for this? > > //Andreas >
Nicole,
As I was about to test (2) I found that I had left an old RevertAll() call in the code which was the source of the exception. Since all I did was call the Demand method on my permission, the RevertAll call was bound to fail. User error strikes again! =) Thanks for taking the time. "Nicole Calinoiu" <ngcalinoiu REMOVETHIS AT gmail DOT com> skrev i meddelandet news:ugaU7nWoEHA.3460@TK2MSFTNGP10.phx.gbl... [quoted text, click to view] >A few questions: > > 1. Does your code apply any stack walk modifiers (Assert, PermitOnly, or > Deny)? > 2. If you replace the FileIOPermission demand by the unmanaged code > demand (i.e.: run the latter from the same place in your code as the > former), do you still get the exception? > 3. Would you mind providing the full exception details, retrieved via its > ToString method? > > > > "Andreas Håkansson" <andreas.hakansson@nospam.com> wrote in message > news:eSclLYWoEHA.3464@tk2msftngp13.phx.gbl... >>I can add to the equation that about 10 lines further down the code I >> perform the following check >> >> Dim UnmanagedPerm As SecurityPermission = _ >> New SecurityPermission(SecurityPermissionFlag.UnmanagedCode) >> UnmanagedPerm.Demand() >> >> Without any problems. I have disabaled the FileIO security check pending >> some feedback, thus I know that this code is executed flawless =/ >> >> And if it is of any help, the code I'm working on is controlled by VSS. >> >> //Andreas >> >> >> "Andreas Håkansson" <andreas.hakansson@nospam.com> skrev i meddelandet >> news:%23g9wlUWoEHA.3988@tk2msftngp13.phx.gbl... >>> While working at a small application, and trying to be a good .net >>> citizen I perform >>> a check to see if the executing code has permission to work with files >>> in a specific >>> directory, like this >>> >>> Dim FilePerm As FileIOPermission = _ >>> New FileIOPermission(FileIOPermissionAccess.AllAccess, >>> Path.GetDirectoryName(FileName)) >>> FilePerm.Demand() >>> >>> However, when the code hits the call to the Demand method it throws an >>> ExecutionEngineException with the message >>> >>> "Unable to retrieve security descriptor for this frame." >>> >>> The application is a WinForm application and in the Main method I assign >>> the >>> current users principal to the current thread like this >>> >>> Shared Sub main() >>> >>> Dim WinUser As WindowsIdentity = _ >>> WindowsIdentity.GetCurrent() >>> Dim WinPrincipal As New WindowsPrincipal(WinUser) >>> System.Threading.Thread.CurrentThread.CurrentPrincipal = >>> WinPrincipal >>> >>> Dim main As New MainForm >>> Application.Run(main) >>> >>> End Sub >>> >>> Any ideas to the reason for this? >>> >>> //Andreas >>> >> >> > >
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