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- LIB: Windows 9X doesn't like it when you specify a security descriptor, so 

special case Win9X so that it'll pass a NULL to CreateFileMapping.
    
    lib/
        shmem.C

svn path=/trunk/boinc/; revision=15152
This commit is contained in:
Rom Walton 2008-05-08 20:10:20 +00:00
parent a0be700d20
commit fd5d31ff71
2 changed files with 104 additions and 80 deletions
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9
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@ -3716,3 +3716,12 @@ David May 8 2008
edf_sim.C
sched_array.C
sched_config.C,h
Rom May 8 2008
- LIB: Windows 9X doesn't like it when you specify a security descriptor, so
special case Win9X so that it'll pass a NULL to CreateFileMapping.
lib/
shmem.C

175
lib/shmem.C
View File

@ -80,84 +80,97 @@ HANDLE create_shmem(LPCTSTR seg_name, int size, void** pp, bool disable_mapview)
EXPLICIT_ACCESS ea;
SID_IDENTIFIER_AUTHORITY SIDAuthWorld = SECURITY_WORLD_SID_AUTHORITY;
SECURITY_ATTRIBUTES sa;
OSVERSIONINFO osvi;
char global_seg_name[256];
// Create a well-known SID for the Everyone group.
if(!AllocateAndInitializeSid(&SIDAuthWorld, 1,
SECURITY_WORLD_RID,
0, 0, 0, 0, 0, 0, 0,
&pEveryoneSID))
{
fprintf(stderr, "AllocateAndInitializeSid Error %u\n", GetLastError());
goto Cleanup;
}
// Win9X doesn't like any reference to a security descriptor. So if we
// detect that we are running on the Win9X platform pass a NULL value
// for it.
osvi.dwOSVersionInfoSize = sizeof(osvi);
GetVersionEx(&osvi);
if (osvi.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS) {
// Initialize an EXPLICIT_ACCESS structure for an ACE.
// The ACE will allow Everyone all access to the shared memory object.
ZeroMemory(&ea, sizeof(EXPLICIT_ACCESS));
ea.grfAccessPermissions = FILE_MAP_ALL_ACCESS;
ea.grfAccessMode = SET_ACCESS;
ea.grfInheritance= NO_INHERITANCE;
ea.Trustee.TrusteeForm = TRUSTEE_IS_SID;
ea.Trustee.TrusteeType = TRUSTEE_IS_WELL_KNOWN_GROUP;
ea.Trustee.ptstrName = (LPTSTR) pEveryoneSID;
// Create a new ACL that contains the new ACEs.
dwRes = SetEntriesInAcl(1, &ea, NULL, &pACL);
if (ERROR_SUCCESS != dwRes)
{
fprintf(stderr, "SetEntriesInAcl Error %u\n", GetLastError());
goto Cleanup;
}
// Initialize a security descriptor.
pSD = (PSECURITY_DESCRIPTOR) LocalAlloc(LPTR, SECURITY_DESCRIPTOR_MIN_LENGTH);
if (NULL == pSD)
{
fprintf(stderr, "LocalAlloc Error %u\n", GetLastError());
goto Cleanup;
}
if (!InitializeSecurityDescriptor(pSD, SECURITY_DESCRIPTOR_REVISION))
{
fprintf(stderr, "InitializeSecurityDescriptor Error %u\n", GetLastError());
goto Cleanup;
}
// Add the ACL to the security descriptor.
if (!SetSecurityDescriptorDacl(pSD,
TRUE, // bDaclPresent flag
pACL,
FALSE)) // not a default DACL
{
fprintf(stderr, "SetSecurityDescriptorDacl Error %u\n", GetLastError());
goto Cleanup;
}
// Initialize a security attributes structure.
sa.nLength = sizeof (SECURITY_ATTRIBUTES);
sa.lpSecurityDescriptor = pSD;
sa.bInheritHandle = FALSE;
// Use the security attributes to set the security descriptor
// when you create a shared file mapping.
// The 'Global' prefix must be included in the shared memory
// name if the shared memory segment is going to cross
// terminal server session boundries.
//
sprintf(global_seg_name, "Global\\%s", seg_name);
// Try using 'Global' so that it can cross terminal server sessions
//
hMap = CreateFileMapping(INVALID_HANDLE_VALUE, &sa, PAGE_READWRITE, 0, size, global_seg_name);
dwError = GetLastError();
if (!hMap && (ERROR_ACCESS_DENIED == dwError)) {
// Couldn't use the 'Global' tag, so just attempt to use the original
// name.
//
hMap = CreateFileMapping(INVALID_HANDLE_VALUE, &sa, PAGE_READWRITE, 0, size, seg_name);
hMap = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, size, seg_name);
dwError = GetLastError();
} else {
// Create a well-known SID for the Everyone group.
if(!AllocateAndInitializeSid(&SIDAuthWorld, 1,
SECURITY_WORLD_RID,
0, 0, 0, 0, 0, 0, 0,
&pEveryoneSID))
{
fprintf(stderr, "AllocateAndInitializeSid Error %u\n", GetLastError());
goto Cleanup;
}
// Initialize an EXPLICIT_ACCESS structure for an ACE.
// The ACE will allow Everyone all access to the shared memory object.
ZeroMemory(&ea, sizeof(EXPLICIT_ACCESS));
ea.grfAccessPermissions = FILE_MAP_ALL_ACCESS;
ea.grfAccessMode = SET_ACCESS;
ea.grfInheritance= NO_INHERITANCE;
ea.Trustee.TrusteeForm = TRUSTEE_IS_SID;
ea.Trustee.TrusteeType = TRUSTEE_IS_WELL_KNOWN_GROUP;
ea.Trustee.ptstrName = (LPTSTR) pEveryoneSID;
// Create a new ACL that contains the new ACEs.
dwRes = SetEntriesInAcl(1, &ea, NULL, &pACL);
if (ERROR_SUCCESS != dwRes)
{
fprintf(stderr, "SetEntriesInAcl Error %u\n", GetLastError());
goto Cleanup;
}
// Initialize a security descriptor.
pSD = (PSECURITY_DESCRIPTOR) LocalAlloc(LPTR, SECURITY_DESCRIPTOR_MIN_LENGTH);
if (NULL == pSD)
{
fprintf(stderr, "LocalAlloc Error %u\n", GetLastError());
goto Cleanup;
}
if (!InitializeSecurityDescriptor(pSD, SECURITY_DESCRIPTOR_REVISION))
{
fprintf(stderr, "InitializeSecurityDescriptor Error %u\n", GetLastError());
goto Cleanup;
}
// Add the ACL to the security descriptor.
if (!SetSecurityDescriptorDacl(pSD,
TRUE, // bDaclPresent flag
pACL,
FALSE)) // not a default DACL
{
fprintf(stderr, "SetSecurityDescriptorDacl Error %u\n", GetLastError());
goto Cleanup;
}
// Initialize a security attributes structure.
sa.nLength = sizeof (SECURITY_ATTRIBUTES);
sa.lpSecurityDescriptor = pSD;
sa.bInheritHandle = FALSE;
// Use the security attributes to set the security descriptor
// when you create a shared file mapping.
// The 'Global' prefix must be included in the shared memory
// name if the shared memory segment is going to cross
// terminal server session boundries.
//
sprintf(global_seg_name, "Global\\%s", seg_name);
// Try using 'Global' so that it can cross terminal server sessions
//
hMap = CreateFileMapping(INVALID_HANDLE_VALUE, &sa, PAGE_READWRITE, 0, size, global_seg_name);
dwError = GetLastError();
if (!hMap && (ERROR_ACCESS_DENIED == dwError)) {
// Couldn't use the 'Global' tag, so just attempt to use the original
// name.
//
hMap = CreateFileMapping(INVALID_HANDLE_VALUE, &sa, PAGE_READWRITE, 0, size, seg_name);
dwError = GetLastError();
}
}
if (disable_mapview && (NULL != hMap) && (ERROR_ALREADY_EXISTS == dwError)) {
@ -171,12 +184,14 @@ HANDLE create_shmem(LPCTSTR seg_name, int size, void** pp, bool disable_mapview)
Cleanup:
if (pEveryoneSID)
FreeSid(pEveryoneSID);
if (pACL)
LocalFree(pACL);
if (pSD)
LocalFree(pSD);
if (osvi.dwPlatformId != VER_PLATFORM_WIN32_WINDOWS) {
if (pEveryoneSID)
FreeSid(pEveryoneSID);
if (pACL)
LocalFree(pACL);
if (pSD)
LocalFree(pSD);
}
return hMap;
}