supressing runtime security checks in C++

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Guest

How can I supress runtime security checks in a mixed-mode C++ assembly?

SuppressUnmanagedCodeSecurityAttribute apparently only works for P/Invoke
and COM interop.

I've got a somewhat chatty interface and can clearly see these checks being
made using PerfMon. In this context I can't reduce the chattiness...

Ideas?

Nick Hodapp
 
Not sure what counter you are looking at, but IJW should not perform a
stackwalk as the target function is already part of a managed assembly.
In contrast COM and PInvoke interop always calls to an unmanaged assembly,
so here you see security stackwalks unless you suppress them.

Willy.
 
Willy said:
Not sure what counter you are looking at, but IJW should not perform a
stackwalk as the target function is already part of a managed
assembly. In contrast COM and PInvoke interop always calls to an
unmanaged assembly, so here you see security stackwalks unless you
suppress them.
Click to expand...

Normally you have an managed c++ assembly only for this reason, that you
either want to call Win32-APIs directly or want to make COM.

And here is the question: How to avoid Runtime-Security cheks in this
transition from managed C++ to the unmanaged world.


--
Greetings
Jochen

My blog about Win32 and .NET
http://blog.kalmbachnet.de/
 
Jochen Kalmbach said:
Normally you have an managed c++ assembly only for this reason, that you
either want to call Win32-APIs directly or want to make COM.

And here is the question: How to avoid Runtime-Security cheks in this
transition from managed C++ to the unmanaged world.
Click to expand...
Consider following sample, here I'm calling into unmanaged code
(_Fillbuffer) and this function calls StringCbCopyW (a safestring function
from safestr.lib).
So there a two transitions from managed to unmanaged code using the IJW
thunk - NOT a PInvoke thunk.
When running this and watching the perfmon counter "CLR security stackwalks"
I see this remain at 0.

//
#include <strsafe.h> // used by safe string functions (strsafe.lib)
#pragma unmanaged
void _FillBuffer(int i)
{
wchar_t *buff = new wchar_t[ 200 ];
// copy some text using safe string functions
StringCbCopyW( ch, 200, L"This text is safely copied to buff");
}
#pragma managed
void main()
System::Console::ReadLine(); // pause to select perfom counters
{
for (int i = 0; i < 10 ; i++)
{
_FillBuffer(i);
}
}

Willy.
 
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