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374 lines
13 KiB
374 lines
13 KiB
/*++
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Copyright (c) Microsoft Corporation
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Module Name:
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sxsstorage.c
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Abstract:
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User-mode side by side storage map default resolution support.
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Private functions that support the default probing/finding
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where assemblies are stored.
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Author:
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Michael J. Grier (mgrier) 6/30/2000
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Revision History:
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--*/
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#if defined(__cplusplus)
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extern "C" {
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#endif
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#pragma warning(disable:4201) // nameless struct/union
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#include "nt.h"
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#include "ntrtl.h"
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#include "nturtl.h"
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#include "string.h"
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#include "ctype.h"
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#include "sxstypes.h"
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#include "ntdllp.h"
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VOID
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NTAPI
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RtlpAssemblyStorageMapResolutionDefaultCallback(
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ULONG Reason,
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PASSEMBLY_STORAGE_MAP_RESOLUTION_CALLBACK_DATA Data,
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PVOID Context
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)
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{
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NTSTATUS Status;
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NTSTATUS *StatusOut = (NTSTATUS *) Context;
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switch (Reason) {
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case ASSEMBLY_STORAGE_MAP_RESOLUTION_CALLBACK_REASON_RESOLUTION_BEGINNING: {
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static const WCHAR NameStringBuffer[] = L"\\Registry\\Machine\\Software\\Microsoft\\Windows\\CurrentVersion\\SideBySide\\AssemblyStorageRoots";
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static const UNICODE_STRING NameString = { sizeof(NameStringBuffer) - sizeof(WCHAR), sizeof(NameStringBuffer), (PWSTR) NameStringBuffer };
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OBJECT_ATTRIBUTES Obja;
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HANDLE KeyHandle = NULL;
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InitializeObjectAttributes(
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&Obja,
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(PUNICODE_STRING) &NameString,
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OBJ_CASE_INSENSITIVE,
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NULL,
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NULL);
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Status = NtOpenKey(&KeyHandle, KEY_ENUMERATE_SUB_KEYS, &Obja);
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if (!NT_SUCCESS(Status)) {
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// If the key is not found, we handle the system assembly installation area and privatized
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// assemblies differently anyways, so let things continue. We'll just stop when we
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// try to use the registry stuff.
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if ((Status != STATUS_OBJECT_NAME_NOT_FOUND) &&
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(Status != STATUS_TOO_LATE)) {
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DbgPrintEx(
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DPFLTR_SXS_ID,
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DPFLTR_ERROR_LEVEL,
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"SXS: Unable to open registry key %wZ Status = 0x%08lx\n", &NameString, Status);
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Data->ResolutionBeginning.CancelResolution = TRUE;
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if (StatusOut != NULL)
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*StatusOut = Status;
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break;
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}
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RTL_SOFT_ASSERT(KeyHandle == NULL);
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}
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Data->ResolutionBeginning.ResolutionContext = (PVOID) KeyHandle;
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Data->ResolutionBeginning.RootCount = ((SIZE_T) -1);
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break;
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}
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case ASSEMBLY_STORAGE_MAP_RESOLUTION_CALLBACK_REASON_GET_ROOT: {
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DbgPrintEx(
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DPFLTR_SXS_ID,
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DPFLTR_TRACE_LEVEL,
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"SXS: Getting assembly storage root #%Iu\n", Data->GetRoot.RootIndex);
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if (Data->GetRoot.RootIndex == 0) {
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// privatized assembly
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static const WCHAR DllRedirectionLocal[] = L".Local\\";
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USHORT cbFullImageNameLength;
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LPWSTR pFullImageName = NULL;
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SIZE_T TotalLength;
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PVOID Cursor = NULL;
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// get ImageName and Lenght from PEB
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cbFullImageNameLength = NtCurrentPeb()->ProcessParameters->ImagePathName.Length; // w/o trailing NULL
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TotalLength = cbFullImageNameLength + sizeof(DllRedirectionLocal); // containing a trailing NULL
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if (TotalLength > UNICODE_STRING_MAX_BYTES) {
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Data->GetRoot.CancelResolution = TRUE;
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if (StatusOut != NULL)
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*StatusOut = STATUS_NAME_TOO_LONG;
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break;
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}
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if ( TotalLength > Data->GetRoot.Root.MaximumLength) {
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Data->GetRoot.CancelResolution = TRUE;
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if (StatusOut != NULL)
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*StatusOut = STATUS_BUFFER_TOO_SMALL;
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break;
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}
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// point to ImageName
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pFullImageName = (PWSTR)NtCurrentPeb()->ProcessParameters->ImagePathName.Buffer;
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if (!(NtCurrentPeb()->ProcessParameters->Flags & RTL_USER_PROC_PARAMS_NORMALIZED))
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pFullImageName = (PWSTR)((PCHAR)pFullImageName + (ULONG_PTR)(NtCurrentPeb()->ProcessParameters));
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Cursor = Data->GetRoot.Root.Buffer;
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RtlCopyMemory(Cursor, pFullImageName, cbFullImageNameLength);
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Cursor = (PVOID) (((ULONG_PTR) Cursor) + cbFullImageNameLength);
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RtlCopyMemory(Cursor, DllRedirectionLocal, sizeof(DllRedirectionLocal));//with a trailing "/" and NULL
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Data->GetRoot.Root.Length = (USHORT)TotalLength - sizeof(WCHAR);
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if ( ! RtlDoesFileExists_U(Data->GetRoot.Root.Buffer)) // no bother to return a wrong path
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Data->GetRoot.Root.Length = 0 ;
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} else if (Data->GetRoot.RootIndex == 1) {
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static const UNICODE_STRING WinSxS = RTL_CONSTANT_STRING(L"\\WinSxS\\");
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UNICODE_STRING SystemRoot;
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RtlInitUnicodeString(&SystemRoot, USER_SHARED_DATA->NtSystemRoot);
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Data->GetRoot.Root.Length = 0;
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if ((SystemRoot.Length + WinSxS.Length) > Data->GetRoot.Root.MaximumLength) {
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Data->GetRoot.CancelResolution = TRUE;
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if (StatusOut != NULL)
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*StatusOut = STATUS_BUFFER_TOO_SMALL;
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break;
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}
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RtlCopyMemory(Data->GetRoot.Root.Buffer, SystemRoot.Buffer, SystemRoot.Length);
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RtlCopyMemory(((PUCHAR)Data->GetRoot.Root.Buffer) + SystemRoot.Length, WinSxS.Buffer, WinSxS.Length);
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Data->GetRoot.Root.Length = SystemRoot.Length + WinSxS.Length;
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} else if (Data->GetRoot.RootIndex <= MAXULONG) {
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// Return the appropriate root
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struct {
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KEY_BASIC_INFORMATION kbi;
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WCHAR KeyNameBuffer[DOS_MAX_PATH_LENGTH]; // arbitrary biggish size
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} KeyData;
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HANDLE KeyHandle = (HANDLE) Data->GetRoot.ResolutionContext;
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ULONG ResultLength = 0;
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ULONG SubKeyIndex = (ULONG) (Data->GetRoot.RootIndex - 2); // minus two because we use index 0 for privatized assembly probing and 1 for %SystemRoot%\winsxs
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UNICODE_STRING SubKeyName;
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// If the registry key could not be opened in the first place, we're done.
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if (KeyHandle == NULL) {
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Data->GetRoot.NoMoreEntries = TRUE;
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break;
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}
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Status = NtEnumerateKey(
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KeyHandle,
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SubKeyIndex,
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KeyBasicInformation,
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&KeyData,
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sizeof(KeyData),
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&ResultLength);
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if (!NT_SUCCESS(Status)) {
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// If this is the end of the subkeys, tell our caller to stop the iterations.
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if (Status == STATUS_NO_MORE_ENTRIES) {
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Data->GetRoot.NoMoreEntries = TRUE;
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break;
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}
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DbgPrintEx(
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DPFLTR_SXS_ID,
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DPFLTR_ERROR_LEVEL,
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"SXS: Unable to enumerate assembly storage subkey #%lu Status = 0x%08lx\n", SubKeyIndex, Status);
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// Otherwise, cancel the searching and propogate the error status.
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Data->GetRoot.CancelResolution = TRUE;
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if (StatusOut != NULL)
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*StatusOut = Status;
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break;
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}
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if (KeyData.kbi.NameLength > UNICODE_STRING_MAX_BYTES) {
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Data->GetRoot.CancelResolution = TRUE;
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if (StatusOut != NULL)
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*StatusOut = STATUS_NAME_TOO_LONG;
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break;
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}
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SubKeyName.Length = (USHORT) KeyData.kbi.NameLength;
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SubKeyName.MaximumLength = SubKeyName.Length;
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SubKeyName.Buffer = KeyData.kbi.Name;
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Status = RtlpGetAssemblyStorageMapRootLocation(
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KeyHandle,
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&SubKeyName,
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&Data->GetRoot.Root);
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if (!NT_SUCCESS(Status)) {
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DbgPrintEx(
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DPFLTR_SXS_ID,
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DPFLTR_ERROR_LEVEL,
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"SXS: Attempt to get storage location from subkey %wZ failed; Status = 0x%08lx\n", &SubKeyName, Status);
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Data->GetRoot.CancelResolution = TRUE;
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if (StatusOut != NULL)
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*StatusOut = Status;
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break;
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}
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} else {
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Data->GetRoot.NoMoreEntries = TRUE;
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break;
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}
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break;
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}
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case ASSEMBLY_STORAGE_MAP_RESOLUTION_CALLBACK_REASON_RESOLUTION_SUCCESSFUL:
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// nothing to do...
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break;
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case ASSEMBLY_STORAGE_MAP_RESOLUTION_CALLBACK_REASON_RESOLUTION_ENDING: {
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// close the registry key, if it was opened.
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if (Data->ResolutionEnding.ResolutionContext != NULL) {
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RTL_SOFT_VERIFY(NT_SUCCESS(NtClose((HANDLE) Data->ResolutionEnding.ResolutionContext)));
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}
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break;
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}
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}
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}
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NTSTATUS
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RtlpGetAssemblyStorageMapRootLocation(
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HANDLE KeyHandle,
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PCUNICODE_STRING SubKeyName,
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PUNICODE_STRING Root
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)
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{
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NTSTATUS Status = STATUS_SUCCESS;
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OBJECT_ATTRIBUTES Obja;
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HANDLE SubKeyHandle = NULL;
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ULONG ResultLength = 0;
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struct {
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KEY_VALUE_PARTIAL_INFORMATION kvpi;
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WCHAR Buffer[DOS_MAX_PATH_LENGTH];
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} ValueData;
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static const WCHAR ValueNameBuffer[] = L"Location";
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static const UNICODE_STRING ValueName = { sizeof(ValueNameBuffer) - sizeof(WCHAR), sizeof(ValueNameBuffer), (PWSTR) ValueNameBuffer };
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ASSERT(KeyHandle != NULL);
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ASSERT(SubKeyName != NULL);
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ASSERT(Root != NULL);
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if ((KeyHandle == NULL) ||
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(SubKeyName == NULL) ||
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(Root == NULL)) {
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Status = STATUS_INVALID_PARAMETER;
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goto Exit;
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}
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InitializeObjectAttributes(
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&Obja,
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(PUNICODE_STRING) &SubKeyName,
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OBJ_CASE_INSENSITIVE,
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KeyHandle,
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NULL);
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Status = NtOpenKey(&SubKeyHandle, KEY_QUERY_VALUE, &Obja);
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if (!NT_SUCCESS(Status)) {
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DbgPrintEx(
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DPFLTR_SXS_ID,
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DPFLTR_ERROR_LEVEL,
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"SXS: Unable to open storage root subkey %wZ; Status = 0x%08lx\n", &SubKeyName, Status);
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goto Exit;
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}
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Status = NtQueryValueKey(
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SubKeyHandle,
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(PUNICODE_STRING) &ValueName,
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KeyValuePartialInformation,
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&ValueData,
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sizeof(ValueData),
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&ResultLength);
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if (!NT_SUCCESS(Status)) {
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DbgPrintEx(
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DPFLTR_SXS_ID,
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DPFLTR_ERROR_LEVEL,
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"SXS: Unabel to query location from storage root subkey %wZ; Status = 0x%08lx\n", &SubKeyName, Status);
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goto Exit;
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}
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if (ValueData.kvpi.Type != REG_SZ) {
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DbgPrintEx(
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DPFLTR_SXS_ID,
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DPFLTR_ERROR_LEVEL,
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"SXS: Assembly storage root location value type is not REG_SZ\n");
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Status = STATUS_OBJECT_PATH_NOT_FOUND;
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goto Exit;
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}
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if ((ValueData.kvpi.DataLength % 2) != 0) {
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// Hmmm... a unicode string with an odd size??
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DbgPrintEx(
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DPFLTR_SXS_ID,
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DPFLTR_ERROR_LEVEL,
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"SXS: Assembly storage root location value has non-even size\n");
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Status = STATUS_OBJECT_PATH_NOT_FOUND;
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goto Exit;
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}
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if (ValueData.kvpi.DataLength > Root->MaximumLength) {
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// The buffer isn't big enough. Let's allocate one that is.
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if (ValueData.kvpi.DataLength > UNICODE_STRING_MAX_BYTES) {
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DbgPrintEx(
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DPFLTR_SXS_ID,
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DPFLTR_ERROR_LEVEL,
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"SXS: Assembly storage root location for %wZ does not fit in a UNICODE STRING\n", &SubKeyName);
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Status = STATUS_NAME_TOO_LONG;
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goto Exit;
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}
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Root->MaximumLength = (USHORT) ValueData.kvpi.DataLength;
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Root->Buffer = (PWSTR)(RtlAllocateStringRoutine)(Root->MaximumLength);
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if (Root->Buffer == NULL) {
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Status = STATUS_NO_MEMORY;
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goto Exit;
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}
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}
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RtlCopyMemory(
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Root->Buffer,
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ValueData.kvpi.Data,
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ValueData.kvpi.DataLength);
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// We checked the length earlier; either it was less than or equal to a value that's
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// already stored in a USHORT or we explicitly compared against UNICODE_STRING_MAX_BYTES.
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Root->Length = (USHORT) ValueData.kvpi.DataLength;
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Status = STATUS_SUCCESS;
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Exit:
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if (SubKeyHandle != NULL) {
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RTL_SOFT_VERIFY(NT_SUCCESS(NtClose(SubKeyHandle)));
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}
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return Status;
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}
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#if defined(__cplusplus)
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} /* extern "C" */
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#endif
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