我想真正了解ERROR_USER_MAPPED_FILE
何时发生。所以我写了一些片段。重现错误。但它没有用。请帮我修改我的代码
流程1:
HANDLE hFile = CreateFile("C:\\test\\full.exe", GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
if (hFile == INVALID_HANDLE_VALUE)
return GetLastError();
HANDLE hMapFile = CreateFileMapping(hFile, NULL, PAGE_READWRITE, 0, 0, NULL);
if (hMapFile == INVALID_HANDLE_VALUE)
return GetLastError();
mapHandles.push_back(hMapFile);
viewHandles.push_back(MapViewOfFile(hMapFile, FILE_MAP_ALL_ACCESS, 0, 0, 0));
我正在暂停该过程,并且在此过程中我还没有关闭任何地图和文件句柄的视图,以便当其他进程尝试打开该文件时。我以为错误1224会被抛出。
流程2:
HANDLE hFile = CreateFile("C:\\test\\full.exe", GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
if (hFile == INVALID_HANDLE_VALUE)
cout << "Error Code : " << GetLastError() << endl;
char buffer[1025];
DWORD bytesRead;
if (!ReadFile(hFile, buffer, 1024, &bytesRead, 0))
cout << "Error Code : " << GetLastError() << endl;
CreateFile
和ReadFile
在流程2中成功。
实际上我正在尝试单独处理此错误1224。这意味着当文件因错误32而失败时我想做点什么。如果文件因错误1224而失败,我想做点什么。
现在我必须测试那些案例。为了测试这些场景,我应该重现错误1224。
答案 0 :(得分:4)
我想真正了解
ERROR_USER_MAPPED_FILE
何时发生
如果真的理解,请提供一些额外信息。
首先从内核返回此错误。所以它最初是NTSTATUS
错误代码,而不是由RtlNtStatusToDosError
转换为win32错误。用于反向翻译的api不存在 - 因为它不是唯一的,但可能自己编写代码,从而创建反向翻译映射。两个NTSTATUS
代码已转换为ERROR_USER_MAPPED_FILE
:STATUS_USER_MAPPED_FILE
和STATUS_PURGE_FAILED
:
if (
RtlNtStatusToDosError(STATUS_USER_MAPPED_FILE) != ERROR_USER_MAPPED_FILE
||
RtlNtStatusToDosError(STATUS_PURGE_FAILED) != ERROR_USER_MAPPED_FILE
)
{
__debugbreak();
}
完全理解返回此代码时需要查看文件系统源代码。我们有fastfat
例子。如果搜索STATUS_USER_MAPPED_FILE
- 我们可以发现此代码从4位返回:
FatSupersedeOrOverwriteFile
- 当我们尝试通话时
FILE_OVERWRITE_IF
FILE_SUPERSEDE
或CreateOption
ZwCreateFile
CREATE_ALWAYS
或当我们使用SE_MANAGE_VOLUME_PRIVILEGE
CreateFile
时
FatSetEndOfFileInfo
- 当我们致电ZwSetInformationFile
时
使用FileEndOfFileInformation
或SetEndOfFile
功能FatSetValidDataLengthInfo
- 我们打电话的时候
ZwSetInformationFile
FileValidDataLengthInformation
或SetFileValidData
功能(我们需要if (!MmCanFileBeTruncated()) return STATUS_USER_MAPPED_FILE;
用于此)FatSetAllocationInfo
- 当我们使用ZwSetInformationFile
时
FileAllocationInformation
(没有win32 api shell)你可以在这里注意到常见的模式:
void test()
{
// for simplicity, i have access to this location as admin
STATIC_OBJECT_ATTRIBUTES(oa, "\\systemroot\\temp\\.tmp");
HANDLE hFile, hSection, hFile2;
IO_STATUS_BLOCK iosb;
LARGE_INTEGER AllocationSize = { PAGE_SIZE };
NTSTATUS status;
if (0 <= NtCreateFile(&hFile, FILE_GENERIC_WRITE|FILE_GENERIC_READ, &oa, &iosb, &AllocationSize, 0,
FILE_SHARE_VALID_FLAGS, FILE_OPEN_IF, FILE_SYNCHRONOUS_IO_NONALERT, 0, 0))
{
status = NtCreateSection(&hSection, SECTION_MAP_READ|SECTION_MAP_WRITE, 0, &AllocationSize, PAGE_READWRITE, SEC_COMMIT, hFile);
if (0 <= status)
{
PVOID BaseAddress = 0;
SIZE_T ViewSize = 0;
status = ZwMapViewOfSection(hSection, NtCurrentProcess(), &BaseAddress, 0, 0, 0, &ViewSize, ViewUnmap, 0, PAGE_READONLY);
NtClose(hSection);
if (0 <= status)
{
LARGE_INTEGER Eof = {};
// SetEndOfFile win32 api
status = ZwSetInformationFile(hFile, &iosb, &Eof, sizeof(Eof), FileEndOfFileInformation);
if (status != STATUS_USER_MAPPED_FILE) __debugbreak();
// no win32 api
status = ZwSetInformationFile(hFile, &iosb, &Eof, sizeof(Eof), FileAllocationInformation);
if (status != STATUS_USER_MAPPED_FILE) __debugbreak();
// SetFileValidData win32 api
// we need have SE_MANAGE_VOLUME_NAME privilege, otherwise STATUS_PRIVILEGE_NOT_HELD
status = ZwSetInformationFile(hFile, &iosb, &Eof, sizeof(Eof), FileValidDataLengthInformation);
switch (status)
{
case STATUS_USER_MAPPED_FILE:
case STATUS_PRIVILEGE_NOT_HELD:
break;
default: __debugbreak();
}
//CreateFileW(L"\\\\?\\c:\\windows\\temp\\.tmp", FILE_GENERIC_READ|FILE_GENERIC_WRITE, FILE_SHARE_VALID_FLAGS, 0, CREATE_ALWAYS, 0, 0);
status = NtCreateFile(&hFile2, FILE_GENERIC_WRITE|FILE_GENERIC_READ, &oa, &iosb, 0, 0,
FILE_SHARE_VALID_FLAGS, FILE_OVERWRITE_IF, FILE_SYNCHRONOUS_IO_NONALERT, 0, 0);
if (status != STATUS_USER_MAPPED_FILE) __debugbreak();
status = NtCreateFile(&hFile2, FILE_GENERIC_WRITE|FILE_GENERIC_READ, &oa, &iosb, 0, 0,
FILE_SHARE_VALID_FLAGS, FILE_SUPERSEDE, FILE_SYNCHRONOUS_IO_NONALERT, 0, 0);
if (status != STATUS_USER_MAPPED_FILE) __debugbreak();
ZwUnmapViewOfSection(NtCurrentProcess(), BaseAddress);
}
}
NtClose(hFile);
}
}
关于重现此错误的演示代码 - 您需要两个进程?!?单一过程中的单一例程 - 绰绰有余。
STATUS_PURGE_FAILED
关于WriteFile
- 当我们调用let parent = document.querySelector('.ms-list-addnew');
// get all child nodes -- including text nodes
let childNodes = parent.childNodes;
// reduce array to contain only text nodes
let textNodes = Array.from(childNodes).filter(node => node.nodeType === Node.TEXT_NODE);
for (let node of textNodes) {
node.nodeValue = node.nodeValue.replace('või selle loendi', '');
}
时,可以返回看起来像here
- 但我无法在测试中重现它。但是很少发生这种错误 - "STATUS_PURGE_FAILED" error when you perform VM replications by using SCVMM in Windows Server 2012 R2
答案 1 :(得分:1)
ERROR_USER_MAPPED_FILE
或错误1224。
HANDLE hFile = CreateFile("C:\\test\\full.exe", GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
if (hFile == INVALID_HANDLE_VALUE)
return GetLastError();
HANDLE hMapFile = CreateFileMapping(hFile, NULL, PAGE_READWRITE, 0, 0, NULL);
if (hMapFile == INVALID_HANDLE_VALUE)
return GetLastError();
mapHandles.push_back(hMapFile);
viewHandles.push_back(MapViewOfFile(hMapFile, FILE_MAP_ALL_ACCESS, 0, 0, 0));
HANDLE hFile = CreateFile("C:\\test\\full.exe", GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
if (hFile == INVALID_HANDLE_VALUE)
{
if(GetLastError() == 1224)
// File has been mapped by other process
else
// some other issue
}
在进程#2中,CREATE_ALWAYS
尝试覆盖已映射的文件。所以它最终会抛出错误1224.