I have used the System service form CreateFileMapping opened a Gobal memory control can read can write,
Under the administrator permissions can be normal Open and read, but in the process of other users (not administrator) can't read, return insufficient permissions (5) ERROR_ACCESS_DEINED,

 
DWORD dwSize=256; 
HANDLE hMap=CreateFileMapping (/* */INVALID_HANDLE_VALUE hFile, NULL, PAGE_READWRITE | SEC_COMMIT, 0, 1024 * 1024, L Global \ \ "" Test"); 
Int RST=GetLastError (); 
If (hMap!=NULL & amp; & RST==ERROR_ALREADY_EXISTS) 
{
The CloseHandle (hMap); 
HMap=NULL; 
} 
Char * pszText=NULL; 
PszText=(CHAR *) MapViewOfFile (hMap FILE_MAP_ALL_ACCESS, 0, 0, 1024 * 1024); 
While (1) 
{

Sleep (3000); 
} 
UnmapViewOfFile (LPCVOID pszText); 
The CloseHandle (hMap); 
return 0; 

Then

 HANDLE hMap=OpenFileMapping (FILE_MAP_ALL_ACCESS, TRUE, L Global \ \ "" Test"); 
If (hMap==NULL) 
{
Lstrcpy (Result, L "0"); 
} 
Char * pszText=NULL; 
PszText=(CHAR *) MapViewOfFile (hMap FILE_MAP_ALL_ACCESS, 0, 0, 1024 * 1024); 

Can't read, GetlastError returns 5

CodePudding user response:

Ah a
PSECURITY_DESCRIPTOR pSec=(PSECURITY_DESCRIPTOR) LocalAlloc (LMEM_FIXED SECURITY_DESCRIPTOR_MIN_LENGTH);
if(! PSec)
{
Return GetLastError ();
}
if(! InitializeSecurityDescriptor (pSec, SECURITY_DESCRIPTOR_REVISION))
{
LocalFree (pSec);
Return GetLastError ();
}
if(! SetSecurityDescriptorDacl (pSec, TRUE, NULL, TRUE))
{
LocalFree (pSec);
Return GetLastError ();
}
SECURITY_ATTRIBUTES attr;
Attr. BInheritHandle=FALSE;
Attr. The lpSecurityDescriptor=pSec;
Attr. NLength=sizeof (SECURITY_ATTRIBUTES);