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[NTDLL] Add policy kill-switch for manifest based automatic shimming

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CORE-16631
This commit is contained in:
Mark Jansen 2020-01-24 20:06:11 +01:00
parent ea35843c30
commit 8381e29467
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GPG key ID: B39240EE84BEAE8B
1 changed files with 40 additions and 0 deletions
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40
dll/ntdll/ldr/ldrinit.c
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@ -1537,6 +1537,40 @@ LdrpValidateImageForMp(IN PLDR_DATA_TABLE_ENTRY LdrDataTableEntry)
UNIMPLEMENTED;
}
BOOLEAN
NTAPI
LdrpDisableProcessCompatGuidDetection(VOID)
{
UNICODE_STRING PolicyKey = RTL_CONSTANT_STRING(L"\\Registry\\MACHINE\\Software\\Policies\\Microsoft\\Windows\\AppCompat");
UNICODE_STRING DisableDetection = RTL_CONSTANT_STRING(L"DisableCompatGuidDetection");
OBJECT_ATTRIBUTES PolicyKeyAttributes = RTL_CONSTANT_OBJECT_ATTRIBUTES(&PolicyKey, OBJ_CASE_INSENSITIVE);
KEY_VALUE_PARTIAL_INFORMATION KeyInfo;
ULONG ResultLength;
NTSTATUS Status;
HANDLE KeyHandle;
Status = NtOpenKey(&KeyHandle, KEY_QUERY_VALUE, &PolicyKeyAttributes);
if (NT_SUCCESS(Status))
{
Status = NtQueryValueKey(KeyHandle,
&DisableDetection,
KeyValuePartialInformation,
&KeyInfo,
sizeof(KeyInfo),
&ResultLength);
NtClose(KeyHandle);
if ((NT_SUCCESS(Status)) &&
(KeyInfo.Type == REG_DWORD) &&
(KeyInfo.DataLength == sizeof(ULONG)) &&
(KeyInfo.Data[0] == TRUE))
{
return TRUE;
}
}
return FALSE;
}
VOID
NTAPI
LdrpInitializeProcessCompat(PVOID pProcessActctx, PVOID* pOldShimData)
@ -1610,6 +1644,12 @@ LdrpInitializeProcessCompat(PVOID pProcessActctx, PVOID* pOldShimData)
if (ContextCompatInfo->Elements[n].Type == ACTCX_COMPATIBILITY_ELEMENT_TYPE_OS &&
RtlCompareMemory(&ContextCompatInfo->Elements[n].Id, KnownCompatGuids[cur].Guid, sizeof(GUID)) == sizeof(GUID))
{
if (LdrpDisableProcessCompatGuidDetection())
{
DPRINT1("LdrpInitializeProcessCompat: Not applying automatic fix for winver 0x%x due to policy\n", KnownCompatGuids[cur].Version);
return;
}
/* If this process did not need shim data before, allocate and store it */
if (pShimData == NULL)
{