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reactos/ntoskrnl/ps/apphelp.c
Victor Perevertkin 5c7ce4475e
[REACTOS] Cleanup INIT and some PAGE section allocations 
- Change INIT_FUNCTION and INIT_SECTION to CODE_SEG("INIT") and DATA_SEG("INIT") respectively
- Remove INIT_FUNCTION from function prototypes
- Remove alloc_text pragma calls as they are not needed anymore
2020-11-02 21:45:31 +03:00

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/*
* PROJECT: ReactOS Kernel
* LICENSE: BSD - See COPYING.ARM in the top level directory
* FILE: ntoskrnl/ps/apphelp.c
* PURPOSE: SHIM engine caching.
* This caching speeds up checks for the apphelp compatibility layer.
* PROGRAMMERS: Mark Jansen
*/
/*
Useful references:
https://github.com/mandiant/ShimCacheParser/blob/master/ShimCacheParser.py
http://technet.microsoft.com/en-us/library/dd837644(v=ws.10).aspx
http://msdn.microsoft.com/en-us/library/bb432182(v=vs.85).aspx
http://www.alex-ionescu.com/?p=43
http://recxltd.blogspot.nl/2012/04/windows-appcompat-research-notes-part-1.html
http://journeyintoir.blogspot.ch/2013/12/revealing-recentfilecachebcf-file.html
https://dl.mandiant.com/EE/library/Whitepaper_ShimCacheParser.pdf
*/
/* INCLUDES ******************************************************************/
#include <ntoskrnl.h>
#define NDEBUG
#include <debug.h>
/* GLOBALS *******************************************************************/
static BOOLEAN ApphelpCacheEnabled = FALSE;
static ERESOURCE ApphelpCacheLock;
static RTL_AVL_TABLE ApphelpShimCache;
static LIST_ENTRY ApphelpShimCacheAge;
extern ULONG InitSafeBootMode;
static UNICODE_STRING AppCompatCacheKey = RTL_CONSTANT_STRING(L"\\Registry\\MACHINE\\System\\CurrentControlSet\\Control\\Session Manager\\AppCompatCache");
static OBJECT_ATTRIBUTES AppCompatKeyAttributes = RTL_CONSTANT_OBJECT_ATTRIBUTES(&AppCompatCacheKey, OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE);
static UNICODE_STRING AppCompatCacheValue = RTL_CONSTANT_STRING(L"AppCompatCache");
#define EMPTY_SHIM_ENTRY { { 0 }, { { 0 } }, 0 }
#define MAX_SHIM_ENTRIES 0x200
#define TAG_SHIM 'MIHS'
#ifndef INVALID_HANDLE_VALUE
#define INVALID_HANDLE_VALUE (HANDLE)(-1)
#endif
#include <pshpack1.h>
typedef struct SHIM_PERSISTENT_CACHE_HEADER_52
{
ULONG Magic;
ULONG NumEntries;
} SHIM_PERSISTENT_CACHE_HEADER_52, *PSHIM_PERSISTENT_CACHE_HEADER_52;
/* The data that is present in the registry (Win2k3 version) */
typedef struct SHIM_PERSISTENT_CACHE_ENTRY_52
{
UNICODE_STRING ImageName;
LARGE_INTEGER DateTime;
LARGE_INTEGER FileSize;
} SHIM_PERSISTENT_CACHE_ENTRY_52, *PSHIM_PERSISTENT_CACHE_ENTRY_52;
#include <poppack.h>
#define CACHE_MAGIC_NT_52 0xbadc0ffe
#define CACHE_HEADER_SIZE_NT_52 0x8
#define NT52_PERSISTENT_ENTRY_SIZE32 0x18
#define NT52_PERSISTENT_ENTRY_SIZE64 0x20
//#define CACHE_MAGIC_NT_61 0xbadc0fee
//#define CACHE_HEADER_SIZE_NT_61 0x80
//#define NT61_PERSISTENT_ENTRY_SIZE32 0x20
//#define NT61_PERSISTENT_ENTRY_SIZE64 0x30
#define SHIM_CACHE_MAGIC CACHE_MAGIC_NT_52
#define SHIM_CACHE_HEADER_SIZE CACHE_HEADER_SIZE_NT_52
#ifdef _WIN64
#define SHIM_PERSISTENT_CACHE_ENTRY_SIZE NT52_PERSISTENT_ENTRY_SIZE64
#else
#define SHIM_PERSISTENT_CACHE_ENTRY_SIZE NT52_PERSISTENT_ENTRY_SIZE32
#endif
#define SHIM_PERSISTENT_CACHE_HEADER SHIM_PERSISTENT_CACHE_HEADER_52
#define PSHIM_PERSISTENT_CACHE_HEADER PSHIM_PERSISTENT_CACHE_HEADER_52
#define SHIM_PERSISTENT_CACHE_ENTRY SHIM_PERSISTENT_CACHE_ENTRY_52
#define PSHIM_PERSISTENT_CACHE_ENTRY PSHIM_PERSISTENT_CACHE_ENTRY_52
C_ASSERT(sizeof(SHIM_PERSISTENT_CACHE_ENTRY) == SHIM_PERSISTENT_CACHE_ENTRY_SIZE);
C_ASSERT(sizeof(SHIM_PERSISTENT_CACHE_HEADER) == SHIM_CACHE_HEADER_SIZE);
/* The struct we keep in memory */
typedef struct SHIM_CACHE_ENTRY
{
LIST_ENTRY List;
SHIM_PERSISTENT_CACHE_ENTRY Persistent;
ULONG CompatFlags;
} SHIM_CACHE_ENTRY, *PSHIM_CACHE_ENTRY;
/* PRIVATE FUNCTIONS *********************************************************/
PVOID
ApphelpAlloc(
_In_ ULONG ByteSize)
{
return ExAllocatePoolWithTag(PagedPool, ByteSize, TAG_SHIM);
}
VOID
ApphelpFree(
_In_ PVOID Data)
{
ExFreePoolWithTag(Data, TAG_SHIM);
}
VOID
ApphelpCacheAcquireLock(VOID)
{
KeEnterCriticalRegion();
ExAcquireResourceExclusiveLite(&ApphelpCacheLock, TRUE);
}
BOOLEAN
ApphelpCacheTryAcquireLock(VOID)
{
KeEnterCriticalRegion();
if (!ExTryToAcquireResourceExclusiveLite(&ApphelpCacheLock))
{
KeLeaveCriticalRegion();
return FALSE;
}
return TRUE;
}
VOID
ApphelpCacheReleaseLock(VOID)
{
ExReleaseResourceLite(&ApphelpCacheLock);
KeLeaveCriticalRegion();
}
VOID
ApphelpDuplicateUnicodeString(
_Out_ PUNICODE_STRING Destination,
_In_ PCUNICODE_STRING Source)
{
Destination->Length = Source->Length;
if (Destination->Length)
{
Destination->MaximumLength = Destination->Length + sizeof(WCHAR);
Destination->Buffer = ApphelpAlloc(Destination->MaximumLength);
RtlCopyMemory(Destination->Buffer, Source->Buffer, Destination->Length);
Destination->Buffer[Destination->Length / sizeof(WCHAR)] = UNICODE_NULL;
}
else
{
Destination->MaximumLength = 0;
Destination->Buffer = NULL;
}
}
VOID
ApphelpFreeUnicodeString(
_Inout_ PUNICODE_STRING String)
{
if (String->Buffer)
{
ApphelpFree(String->Buffer);
}
String->Length = 0;
String->MaximumLength = 0;
String->Buffer = NULL;
}
/* Query file info from a handle, storing it in Entry */
NTSTATUS
ApphelpCacheQueryInfo(
_In_ HANDLE ImageHandle,
_Out_ PSHIM_CACHE_ENTRY Entry)
{
IO_STATUS_BLOCK IoStatusBlock;
FILE_BASIC_INFORMATION FileBasic;
FILE_STANDARD_INFORMATION FileStandard;
NTSTATUS Status;
Status = ZwQueryInformationFile(ImageHandle,
&IoStatusBlock,
&FileBasic,
sizeof(FileBasic),
FileBasicInformation);
if (!NT_SUCCESS(Status))
{
return Status;
}
Status = ZwQueryInformationFile(ImageHandle,
&IoStatusBlock,
&FileStandard,
sizeof(FileStandard),
FileStandardInformation);
if (NT_SUCCESS(Status))
{
Entry->Persistent.DateTime = FileBasic.LastWriteTime;
Entry->Persistent.FileSize = FileStandard.EndOfFile;
}
return Status;
}
RTL_GENERIC_COMPARE_RESULTS
NTAPI
ApphelpShimCacheCompareRoutine(
_In_ struct _RTL_AVL_TABLE *Table,
_In_ PVOID FirstStruct,
_In_ PVOID SecondStruct)
{
PSHIM_CACHE_ENTRY FirstEntry = FirstStruct;
PSHIM_CACHE_ENTRY SecondEntry = SecondStruct;
LONG Result;
Result = RtlCompareUnicodeString(&FirstEntry->Persistent.ImageName,
&SecondEntry->Persistent.ImageName,
TRUE);
if (Result < 0)
{
return GenericLessThan;
}
else if (Result == 0)
{
return GenericEqual;
}
return GenericGreaterThan;
}
PVOID
NTAPI
ApphelpShimCacheAllocateRoutine(
_In_ struct _RTL_AVL_TABLE *Table,
_In_ CLONG ByteSize)
{
return ApphelpAlloc(ByteSize);
}
VOID
NTAPI
ApphelpShimCacheFreeRoutine(
_In_ struct _RTL_AVL_TABLE *Table,
_In_ PVOID Buffer)
{
ApphelpFree(Buffer);
}
NTSTATUS
ApphelpCacheParse(
_In_reads_(DataLength) PUCHAR Data,
_In_ ULONG DataLength)
{
PSHIM_PERSISTENT_CACHE_HEADER Header = (PSHIM_PERSISTENT_CACHE_HEADER)Data;
ULONG Cur;
ULONG NumEntries;
UNICODE_STRING String;
SHIM_CACHE_ENTRY Entry = EMPTY_SHIM_ENTRY;
PSHIM_CACHE_ENTRY Result;
PSHIM_PERSISTENT_CACHE_ENTRY Persistent;
if (DataLength < CACHE_HEADER_SIZE_NT_52)
{
DPRINT1("SHIMS: ApphelpCacheParse not enough data for a minimal header (0x%x)\n", DataLength);
return STATUS_INVALID_PARAMETER;
}
if (Header->Magic != SHIM_CACHE_MAGIC)
{
DPRINT1("SHIMS: ApphelpCacheParse found invalid magic (0x%x)\n", Header->Magic);
return STATUS_INVALID_PARAMETER;
}
NumEntries = Header->NumEntries;
DPRINT("SHIMS: ApphelpCacheParse walking %d entries\n", NumEntries);
for (Cur = 0; Cur < NumEntries; ++Cur)
{
Persistent = (PSHIM_PERSISTENT_CACHE_ENTRY)(Data + SHIM_CACHE_HEADER_SIZE +
(Cur * SHIM_PERSISTENT_CACHE_ENTRY_SIZE));
/* The entry in the Persistent storage is not really a UNICODE_STRING,
so we have to convert the offset into a real pointer before using it. */
String.Length = Persistent->ImageName.Length;
String.MaximumLength = Persistent->ImageName.MaximumLength;
String.Buffer = (PWCHAR)((ULONG_PTR)Persistent->ImageName.Buffer + Data);
/* Now we copy all data to a local buffer, that can be safely duplicated by RtlInsert */
Entry.Persistent = *Persistent;
ApphelpDuplicateUnicodeString(&Entry.Persistent.ImageName, &String);
Result = RtlInsertElementGenericTableAvl(&ApphelpShimCache,
&Entry,
sizeof(Entry),
NULL);
if (!Result)
{
DPRINT1("SHIMS: ApphelpCacheParse insert failed\n");
ApphelpFreeUnicodeString(&Entry.Persistent.ImageName);
return STATUS_INVALID_PARAMETER;
}
InsertTailList(&ApphelpShimCacheAge, &Result->List);
}
return STATUS_SUCCESS;
}
BOOLEAN
ApphelpCacheRead(VOID)
{
HANDLE KeyHandle;
NTSTATUS Status;
KEY_VALUE_PARTIAL_INFORMATION KeyValueObject;
PKEY_VALUE_PARTIAL_INFORMATION KeyValueInformation = &KeyValueObject;
ULONG KeyInfoSize, ResultSize;
Status = ZwOpenKey(&KeyHandle, KEY_QUERY_VALUE, &AppCompatKeyAttributes);
if (!NT_SUCCESS(Status))
{
DPRINT1("SHIMS: ApphelpCacheRead could not even open Session Manager\\AppCompatCache (0x%x)\n", Status);
return FALSE;
}
Status = ZwQueryValueKey(KeyHandle,
&AppCompatCacheValue,
KeyValuePartialInformation,
KeyValueInformation,
sizeof(KeyValueObject),
&ResultSize);
if (Status == STATUS_BUFFER_OVERFLOW)
{
KeyInfoSize = sizeof(KEY_VALUE_PARTIAL_INFORMATION) + KeyValueInformation->DataLength;
KeyValueInformation = ApphelpAlloc(KeyInfoSize);
if (KeyValueInformation != NULL)
{
Status = ZwQueryValueKey(KeyHandle,
&AppCompatCacheValue,
KeyValuePartialInformation,
KeyValueInformation,
KeyInfoSize,
&ResultSize);
}
}
if (NT_SUCCESS(Status) && KeyValueInformation->Type == REG_BINARY)
{
Status = ApphelpCacheParse(KeyValueInformation->Data,
KeyValueInformation->DataLength);
}
else
{
DPRINT1("SHIMS: ApphelpCacheRead not loaded from registry (0x%x)\n", Status);
}
if (KeyValueInformation != &KeyValueObject && KeyValueInformation != NULL)
{
ApphelpFree(KeyValueInformation);
}
ZwClose(KeyHandle);
return NT_SUCCESS(Status);
}
BOOLEAN
ApphelpCacheWrite(VOID)
{
ULONG Length = SHIM_CACHE_HEADER_SIZE;
ULONG NumEntries = 0;
PLIST_ENTRY ListEntry;
PUCHAR Buffer, BufferNamePos;
PSHIM_PERSISTENT_CACHE_HEADER Header;
PSHIM_PERSISTENT_CACHE_ENTRY WriteEntry;
HANDLE KeyHandle;
NTSTATUS Status;
/* First we have to calculate the required size. */
ApphelpCacheAcquireLock();
ListEntry = ApphelpShimCacheAge.Flink;
while (ListEntry != &ApphelpShimCacheAge)
{
PSHIM_CACHE_ENTRY Entry = CONTAINING_RECORD(ListEntry, SHIM_CACHE_ENTRY, List);
Length += SHIM_PERSISTENT_CACHE_ENTRY_SIZE;
Length += Entry->Persistent.ImageName.MaximumLength;
++NumEntries;
ListEntry = ListEntry->Flink;
}
DPRINT("SHIMS: ApphelpCacheWrite, %d Entries, total size: %d\n", NumEntries, Length);
Length = ROUND_UP(Length, sizeof(ULONGLONG));
DPRINT("SHIMS: ApphelpCacheWrite, Rounded to: %d\n", Length);
/* Now we allocate and prepare some helpers */
Buffer = ApphelpAlloc(Length);
BufferNamePos = Buffer + Length;
Header = (PSHIM_PERSISTENT_CACHE_HEADER)Buffer;
WriteEntry = (PSHIM_PERSISTENT_CACHE_ENTRY)(Buffer + SHIM_CACHE_HEADER_SIZE);
Header->Magic = SHIM_CACHE_MAGIC;
Header->NumEntries = NumEntries;
ListEntry = ApphelpShimCacheAge.Flink;
while (ListEntry != &ApphelpShimCacheAge)
{
PSHIM_CACHE_ENTRY Entry = CONTAINING_RECORD(ListEntry, SHIM_CACHE_ENTRY, List);
USHORT ImageNameLen = Entry->Persistent.ImageName.MaximumLength;
/* Copy the Persistent structure over */
*WriteEntry = Entry->Persistent;
BufferNamePos -= ImageNameLen;
/* Copy the image name over */
RtlCopyMemory(BufferNamePos, Entry->Persistent.ImageName.Buffer, ImageNameLen);
/* Fix the Persistent structure, so that Buffer is once again an offset */
WriteEntry->ImageName.Buffer = (PWCH)(BufferNamePos - Buffer);
++WriteEntry;
ListEntry = ListEntry->Flink;
}
ApphelpCacheReleaseLock();
Status = ZwOpenKey(&KeyHandle, KEY_SET_VALUE, &AppCompatKeyAttributes);
if (NT_SUCCESS(Status))
{
Status = ZwSetValueKey(KeyHandle,
&AppCompatCacheValue,
0,
REG_BINARY,
Buffer,
Length);
ZwClose(KeyHandle);
}
else
{
DPRINT1("SHIMS: ApphelpCacheWrite could not even open Session Manager\\AppCompatCache (0x%x)\n", Status);
}
ApphelpFree(Buffer);
return NT_SUCCESS(Status);
}
CODE_SEG("INIT")
NTSTATUS
NTAPI
ApphelpCacheInitialize(VOID)
{
DPRINT("SHIMS: ApphelpCacheInitialize\n");
/* If we are booting in safemode we do not want to use the apphelp cache */
if (InitSafeBootMode)
{
DPRINT1("SHIMS: Safe mode detected, disabling cache.\n");
ApphelpCacheEnabled = FALSE;
}
else
{
ExInitializeResourceLite(&ApphelpCacheLock);
RtlInitializeGenericTableAvl(&ApphelpShimCache,
ApphelpShimCacheCompareRoutine,
ApphelpShimCacheAllocateRoutine,
ApphelpShimCacheFreeRoutine,
NULL);
InitializeListHead(&ApphelpShimCacheAge);
ApphelpCacheEnabled = ApphelpCacheRead();
}
DPRINT("SHIMS: ApphelpCacheInitialize: %d\n", ApphelpCacheEnabled);
return STATUS_SUCCESS;
}
VOID
NTAPI
ApphelpCacheShutdown(VOID)
{
if (ApphelpCacheEnabled)
{
ApphelpCacheWrite();
}
}
NTSTATUS
ApphelpValidateData(
_In_opt_ PAPPHELP_CACHE_SERVICE_LOOKUP ServiceData,
_Out_ PUNICODE_STRING ImageName,
_Out_ PHANDLE ImageHandle)
{
NTSTATUS Status = STATUS_INVALID_PARAMETER;
if (ServiceData)
{
UNICODE_STRING LocalImageName;
_SEH2_TRY
{
ProbeForRead(ServiceData,
sizeof(APPHELP_CACHE_SERVICE_LOOKUP),
sizeof(ULONG));
LocalImageName = ServiceData->ImageName;
*ImageHandle = ServiceData->ImageHandle;
if (LocalImageName.Length && LocalImageName.Buffer)
{
ProbeForRead(LocalImageName.Buffer,
LocalImageName.Length * sizeof(WCHAR),
1);
ApphelpDuplicateUnicodeString(ImageName, &LocalImageName);
Status = STATUS_SUCCESS;
}
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
_SEH2_YIELD(return _SEH2_GetExceptionCode());
}
_SEH2_END;
}
if (!NT_SUCCESS(Status))
{
DPRINT1("SHIMS: ApphelpValidateData: invalid data passed\n");
}
return Status;
}
NTSTATUS
ApphelpCacheRemoveEntryNolock(
_In_ PSHIM_CACHE_ENTRY Entry)
{
if (Entry)
{
PWSTR Buffer = Entry->Persistent.ImageName.Buffer;
RemoveEntryList(&Entry->List);
if (RtlDeleteElementGenericTableAvl(&ApphelpShimCache, Entry))
{
ApphelpFree(Buffer);
}
return STATUS_SUCCESS;
}
return STATUS_NOT_FOUND;
}
NTSTATUS
ApphelpCacheLookupEntry(
_In_ PUNICODE_STRING ImageName,
_In_ HANDLE ImageHandle)
{
NTSTATUS Status = STATUS_NOT_FOUND;
SHIM_CACHE_ENTRY Lookup = EMPTY_SHIM_ENTRY;
PSHIM_CACHE_ENTRY Entry;
if (!ApphelpCacheTryAcquireLock())
{
return Status;
}
Lookup.Persistent.ImageName = *ImageName;
Entry = RtlLookupElementGenericTableAvl(&ApphelpShimCache, &Lookup);
if (Entry == NULL)
{
DPRINT("SHIMS: ApphelpCacheLookupEntry: could not find %wZ\n", ImageName);
goto Cleanup;
}
DPRINT("SHIMS: ApphelpCacheLookupEntry: found %wZ\n", ImageName);
if (ImageHandle == INVALID_HANDLE_VALUE)
{
DPRINT("SHIMS: ApphelpCacheLookupEntry: ok\n");
/* just return if we know it, do not query file info */
Status = STATUS_SUCCESS;
}
else
{
Status = ApphelpCacheQueryInfo(ImageHandle, &Lookup);
if (NT_SUCCESS(Status) &&
Lookup.Persistent.DateTime.QuadPart == Entry->Persistent.DateTime.QuadPart &&
Lookup.Persistent.FileSize.QuadPart == Entry->Persistent.FileSize.QuadPart)
{
DPRINT("SHIMS: ApphelpCacheLookupEntry: found & validated\n");
Status = STATUS_SUCCESS;
/* move it to the front to keep it alive */
RemoveEntryList(&Entry->List);
InsertHeadList(&ApphelpShimCacheAge, &Entry->List);
}
else
{
DPRINT1("SHIMS: ApphelpCacheLookupEntry: file info mismatch (%lx)\n", Status);
Status = STATUS_NOT_FOUND;
/* Could not read file info, or it did not match, drop it from the cache */
ApphelpCacheRemoveEntryNolock(Entry);
}
}
Cleanup:
ApphelpCacheReleaseLock();
return Status;
}
NTSTATUS
ApphelpCacheRemoveEntry(
_In_ PUNICODE_STRING ImageName)
{
PSHIM_CACHE_ENTRY Entry;
NTSTATUS Status;
ApphelpCacheAcquireLock();
Entry = RtlLookupElementGenericTableAvl(&ApphelpShimCache, ImageName);
Status = ApphelpCacheRemoveEntryNolock(Entry);
ApphelpCacheReleaseLock();
return Status;
}
/* Validate that we are either called from r0, or from a service-like context */
NTSTATUS
ApphelpCacheAccessCheck(VOID)
{
if (ExGetPreviousMode() != KernelMode)
{
if (!SeSinglePrivilegeCheck(SeTcbPrivilege, UserMode))
{
DPRINT1("SHIMS: ApphelpCacheAccessCheck failed\n");
return STATUS_ACCESS_DENIED;
}
}
return STATUS_SUCCESS;
}
NTSTATUS
ApphelpCacheUpdateEntry(
_In_ PUNICODE_STRING ImageName,
_In_ HANDLE ImageHandle)
{
NTSTATUS Status = STATUS_SUCCESS;
SHIM_CACHE_ENTRY Entry = EMPTY_SHIM_ENTRY;
PSHIM_CACHE_ENTRY Lookup;
PVOID NodeOrParent;
TABLE_SEARCH_RESULT SearchResult;
ApphelpCacheAcquireLock();
/* If we got a file handle, query it for info */
if (ImageHandle != INVALID_HANDLE_VALUE)
{
Status = ApphelpCacheQueryInfo(ImageHandle, &Entry);
if (!NT_SUCCESS(Status))
{
goto Cleanup;
}
}
/* Use ImageName for the lookup, don't actually duplicate it */
Entry.Persistent.ImageName = *ImageName;
Lookup = RtlLookupElementGenericTableFullAvl(&ApphelpShimCache,
&Entry,
&NodeOrParent, &SearchResult);
if (Lookup)
{
DPRINT("SHIMS: ApphelpCacheUpdateEntry: Entry already exists, reusing it\n");
/* Unlink the found item, so we can put it back at the front,
and copy the earlier obtained file info*/
RemoveEntryList(&Lookup->List);
Lookup->Persistent.DateTime = Entry.Persistent.DateTime;
Lookup->Persistent.FileSize = Entry.Persistent.FileSize;
}
else
{
DPRINT("SHIMS: ApphelpCacheUpdateEntry: Inserting new Entry\n");
/* Insert a new entry, with its own copy of the ImageName */
ApphelpDuplicateUnicodeString(&Entry.Persistent.ImageName, ImageName);
Lookup = RtlInsertElementGenericTableFullAvl(&ApphelpShimCache,
&Entry,
sizeof(Entry),
0,
NodeOrParent,
SearchResult);
if (!Lookup)
{
ApphelpFreeUnicodeString(&Entry.Persistent.ImageName);
Status = STATUS_NO_MEMORY;
}
}
if (Lookup)
{
/* Either we re-used an existing item, or we inserted a new one, keep it alive */
InsertHeadList(&ApphelpShimCacheAge, &Lookup->List);
if (RtlNumberGenericTableElementsAvl(&ApphelpShimCache) > MAX_SHIM_ENTRIES)
{
PSHIM_CACHE_ENTRY Remove;
DPRINT1("SHIMS: ApphelpCacheUpdateEntry: Cache growing too big, dropping oldest item\n");
Remove = CONTAINING_RECORD(ApphelpShimCacheAge.Blink, SHIM_CACHE_ENTRY, List);
Status = ApphelpCacheRemoveEntryNolock(Remove);
}
}
Cleanup:
ApphelpCacheReleaseLock();
return Status;
}
NTSTATUS
ApphelpCacheFlush(VOID)
{
PVOID p;
DPRINT1("SHIMS: ApphelpCacheFlush\n");
ApphelpCacheAcquireLock();
while ((p = RtlEnumerateGenericTableAvl(&ApphelpShimCache, TRUE)))
{
ApphelpCacheRemoveEntryNolock((PSHIM_CACHE_ENTRY)p);
}
ApphelpCacheReleaseLock();
return STATUS_SUCCESS;
}
NTSTATUS
ApphelpCacheDump(VOID)
{
PLIST_ENTRY ListEntry;
PSHIM_CACHE_ENTRY Entry;
DPRINT1("SHIMS: NtApphelpCacheControl( Dumping entries, newest to oldest )\n");
ApphelpCacheAcquireLock();
ListEntry = ApphelpShimCacheAge.Flink;
while (ListEntry != &ApphelpShimCacheAge)
{
Entry = CONTAINING_RECORD(ListEntry, SHIM_CACHE_ENTRY, List);
DPRINT1("Entry: %wZ\n", &Entry->Persistent.ImageName);
DPRINT1("DateTime: 0x%I64x\n", Entry->Persistent.DateTime.QuadPart);
DPRINT1("FileSize: 0x%I64x\n", Entry->Persistent.FileSize.QuadPart);
DPRINT1("Flags: 0x%x\n", Entry->CompatFlags);
ListEntry = ListEntry->Flink;
}
ApphelpCacheReleaseLock();
return STATUS_SUCCESS;
}
/* PUBLIC FUNCTIONS **********************************************************/
NTSTATUS
NTAPI
NtApphelpCacheControl(
_In_ APPHELPCACHESERVICECLASS Service,
_In_opt_ PAPPHELP_CACHE_SERVICE_LOOKUP ServiceData)
{
NTSTATUS Status = STATUS_INVALID_PARAMETER;
UNICODE_STRING ImageName = { 0 };
HANDLE Handle = INVALID_HANDLE_VALUE;
if (!ApphelpCacheEnabled)
{
DPRINT1("NtApphelpCacheControl: ApphelpCacheEnabled == 0\n");
return Status;
}
switch (Service)
{
case ApphelpCacheServiceLookup:
DPRINT("SHIMS: NtApphelpCacheControl( ApphelpCacheServiceLookup )\n");
Status = ApphelpValidateData(ServiceData, &ImageName, &Handle);
if (NT_SUCCESS(Status))
Status = ApphelpCacheLookupEntry(&ImageName, Handle);
break;
case ApphelpCacheServiceRemove:
DPRINT("SHIMS: NtApphelpCacheControl( ApphelpCacheServiceRemove )\n");
Status = ApphelpValidateData(ServiceData, &ImageName, &Handle);
if (NT_SUCCESS(Status))
Status = ApphelpCacheRemoveEntry(&ImageName);
break;
case ApphelpCacheServiceUpdate:
DPRINT("SHIMS: NtApphelpCacheControl( ApphelpCacheServiceUpdate )\n");
Status = ApphelpCacheAccessCheck();
if (NT_SUCCESS(Status))
{
Status = ApphelpValidateData(ServiceData, &ImageName, &Handle);
if (NT_SUCCESS(Status))
Status = ApphelpCacheUpdateEntry(&ImageName, Handle);
}
break;
case ApphelpCacheServiceFlush:
/* FIXME: Check for admin or system here. */
Status = ApphelpCacheFlush();
break;
case ApphelpCacheServiceDump:
Status = ApphelpCacheDump();
break;
case ApphelpDBGReadRegistry:
DPRINT1("SHIMS: NtApphelpCacheControl( ApphelpDBGReadRegistry ): flushing cache.\n");
ApphelpCacheFlush();
DPRINT1("SHIMS: NtApphelpCacheControl( ApphelpDBGReadRegistry ): reading cache.\n");
Status = ApphelpCacheRead() ? STATUS_SUCCESS : STATUS_NOT_FOUND;
break;
case ApphelpDBGWriteRegistry:
DPRINT1("SHIMS: NtApphelpCacheControl( ApphelpDBGWriteRegistry ): writing cache.\n");
Status = ApphelpCacheWrite() ? STATUS_SUCCESS : STATUS_NOT_FOUND;
break;
default:
DPRINT1("SHIMS: NtApphelpCacheControl( Invalid service requested )\n");
break;
}
if (ImageName.Buffer)
{
ApphelpFreeUnicodeString(&ImageName);
}
return Status;
}
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