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Home > Forums > Programmers > Languages > C++: Microsoft Forum

Shared Memory and ACLs

thread207-1583831
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xwb (Programmer)
19 Dec 09 3:57
I have a client process that uses shared memory created by a service.  The problem is that the service is created as "Local User" so the clients are unable to access the shared memory.  Even with adding a "Global\" prefix, I can't access the memory.  I'm creating the shared memory as

CODE

      mHandle = CreateFileMapping (
         (HANDLE) 0xFFFFFFFF,           // Use system buffering
         (LPSECURITY_ATTRIBUTES) 0,
         PAGE_READWRITE,                // Protection
         0,                             // filesize high dword
         mFileSize,                      // filesize low dword
         name);                         // Name
What it boils down to is I have to fill in the LPSECURITY_ATTRIBUTES for the "Everyone" user.  I've been playing with all sorts of combinations for the last 3 hours and getting nowhere.  This is the basic framework I'm using

CODE

      SECURITY_DESCRIPTOR* sd = new SECURITY_DESCRIPTOR();
      InitializeSecurityDescriptor (sd, SECURITY_DESCRIPTOR_REVISION);
      // Have tried all sorts of permutations on the contents of sd

      SECURITY_ATTRIBUTES* sa = new SECURITY_ATTRIBUTES;
      sa->nLength = sizeof (*sa);
      sa->bInheritHandle = FALSE;
      sa->lpSecurityDescriptor = sd;
      std::string name = "Global\\";
      name += (in_name == 0? SMBaseName: in_name);
      mHandle = CreateFileMapping (
         (HANDLE) 0xFFFFFFFF,           // Use system buffering
         sa,
         PAGE_READWRITE,           // Protection
         0,                             // filesize high dword
         mFileSize,                     // filesize low dword
         name.c_str());                 // Name
Any simple examples on what to put into sd to represent the "Everyone" user would be great.
xwb (Programmer)
26 Dec 09 5:36
Found the answer in http://msdn.microsoft.com/en-us/library/aa446595(VS.85).aspx
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