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Diffstat (limited to '')
| -rw-r--r-- | xpcom/build/PoisonIOInterposerWin.cpp | 508 |
1 files changed, 508 insertions, 0 deletions
diff --git a/xpcom/build/PoisonIOInterposerWin.cpp b/xpcom/build/PoisonIOInterposerWin.cpp new file mode 100644 index 0000000000..0d78e073ca --- /dev/null +++ b/xpcom/build/PoisonIOInterposerWin.cpp @@ -0,0 +1,508 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "PoisonIOInterposer.h" + +#include <algorithm> +#include <stdio.h> +#include <vector> + +#include <io.h> +#include <windows.h> +#include <winternl.h> + +#include "mozilla/Assertions.h" +#include "mozilla/ClearOnShutdown.h" +#include "mozilla/FileUtilsWin.h" +#include "mozilla/IOInterposer.h" +#include "mozilla/Mutex.h" +#include "mozilla/NativeNt.h" +#include "mozilla/SmallArrayLRUCache.h" +#include "mozilla/TimeStamp.h" +#include "mozilla/UniquePtr.h" +#include "nsTArray.h" +#include "nsWindowsDllInterceptor.h" + +#ifdef MOZ_REPLACE_MALLOC +# include "replace_malloc_bridge.h" +#endif + +namespace { + +// Keep track of poisoned state. Notice that there is no reason to lock access +// to this variable as it's only changed in InitPoisonIOInterposer and +// ClearPoisonIOInterposer which may only be called on the main-thread when no +// other threads are running. +static bool sIOPoisoned = false; + +/************************ Internal NT API Declarations ************************/ + +/* + * Function pointer declaration for internal NT routine to create/open files. + * For documentation on the NtCreateFile routine, see MSDN. + */ +typedef NTSTATUS(NTAPI* NtCreateFileFn)( + PHANDLE aFileHandle, ACCESS_MASK aDesiredAccess, + POBJECT_ATTRIBUTES aObjectAttributes, PIO_STATUS_BLOCK aIoStatusBlock, + PLARGE_INTEGER aAllocationSize, ULONG aFileAttributes, ULONG aShareAccess, + ULONG aCreateDisposition, ULONG aCreateOptions, PVOID aEaBuffer, + ULONG aEaLength); + +/** + * Function pointer declaration for internal NT routine to read data from file. + * For documentation on the NtReadFile routine, see ZwReadFile on MSDN. + */ +typedef NTSTATUS(NTAPI* NtReadFileFn)(HANDLE aFileHandle, HANDLE aEvent, + PIO_APC_ROUTINE aApc, PVOID aApcCtx, + PIO_STATUS_BLOCK aIoStatus, PVOID aBuffer, + ULONG aLength, PLARGE_INTEGER aOffset, + PULONG aKey); + +/** + * Function pointer declaration for internal NT routine to read data from file. + * No documentation exists, see wine sources for details. + */ +typedef NTSTATUS(NTAPI* NtReadFileScatterFn)( + HANDLE aFileHandle, HANDLE aEvent, PIO_APC_ROUTINE aApc, PVOID aApcCtx, + PIO_STATUS_BLOCK aIoStatus, FILE_SEGMENT_ELEMENT* aSegments, ULONG aLength, + PLARGE_INTEGER aOffset, PULONG aKey); + +/** + * Function pointer declaration for internal NT routine to write data to file. + * For documentation on the NtWriteFile routine, see ZwWriteFile on MSDN. + */ +typedef NTSTATUS(NTAPI* NtWriteFileFn)(HANDLE aFileHandle, HANDLE aEvent, + PIO_APC_ROUTINE aApc, PVOID aApcCtx, + PIO_STATUS_BLOCK aIoStatus, + PVOID aBuffer, ULONG aLength, + PLARGE_INTEGER aOffset, PULONG aKey); + +/** + * Function pointer declaration for internal NT routine to write data to file. + * No documentation exists, see wine sources for details. + */ +typedef NTSTATUS(NTAPI* NtWriteFileGatherFn)( + HANDLE aFileHandle, HANDLE aEvent, PIO_APC_ROUTINE aApc, PVOID aApcCtx, + PIO_STATUS_BLOCK aIoStatus, FILE_SEGMENT_ELEMENT* aSegments, ULONG aLength, + PLARGE_INTEGER aOffset, PULONG aKey); + +/** + * Function pointer declaration for internal NT routine to flush to disk. + * For documentation on the NtFlushBuffersFile routine, see ZwFlushBuffersFile + * on MSDN. + */ +typedef NTSTATUS(NTAPI* NtFlushBuffersFileFn)(HANDLE aFileHandle, + PIO_STATUS_BLOCK aIoStatusBlock); + +typedef struct _FILE_NETWORK_OPEN_INFORMATION* PFILE_NETWORK_OPEN_INFORMATION; +/** + * Function pointer delaration for internal NT routine to query file attributes. + * (equivalent to stat) + */ +typedef NTSTATUS(NTAPI* NtQueryFullAttributesFileFn)( + POBJECT_ATTRIBUTES aObjectAttributes, + PFILE_NETWORK_OPEN_INFORMATION aFileInformation); + +/*************************** Auxiliary Declarations ***************************/ + +// Cache of filenames associated with handles. +// `static` to be shared between all calls to `Filename()`. +// This assumes handles are not reused, at least within a windows of 32 +// handles. +// Profiling showed that during startup, around half of `Filename()` calls are +// resolved with the first entry (best case), and 32 entries cover >95% of +// cases, reducing the average `Filename()` cost by 5-10x. +using HandleToFilenameCache = mozilla::SmallArrayLRUCache<HANDLE, nsString, 32>; +static mozilla::UniquePtr<HandleToFilenameCache> sHandleToFilenameCache; + +/** + * RAII class for timing the duration of an I/O call and reporting the result + * to the mozilla::IOInterposeObserver API. + */ +class WinIOAutoObservation : public mozilla::IOInterposeObserver::Observation { + public: + WinIOAutoObservation(mozilla::IOInterposeObserver::Operation aOp, + HANDLE aFileHandle, const LARGE_INTEGER* aOffset) + : mozilla::IOInterposeObserver::Observation( + aOp, sReference, + !mozilla::IsDebugFile(reinterpret_cast<intptr_t>(aFileHandle))), + mFileHandle(aFileHandle), + mFileHandleType(GetFileType(aFileHandle)), + mHasQueriedFilename(false) { + if (mShouldReport) { + mOffset.QuadPart = aOffset ? aOffset->QuadPart : 0; + } + } + + WinIOAutoObservation(mozilla::IOInterposeObserver::Operation aOp, + nsAString& aFilename) + : mozilla::IOInterposeObserver::Observation(aOp, sReference), + mFileHandle(nullptr), + mFileHandleType(FILE_TYPE_UNKNOWN), + mHasQueriedFilename(false) { + if (mShouldReport) { + nsAutoString dosPath; + if (mozilla::NtPathToDosPath(aFilename, dosPath)) { + mFilename = dosPath; + } else { + // If we can't get a dosPath, what we have is better than nothing. + mFilename = aFilename; + } + mHasQueriedFilename = true; + mOffset.QuadPart = 0; + } + } + + void SetHandle(HANDLE aFileHandle) { + mFileHandle = aFileHandle; + if (aFileHandle) { + // Note: `GetFileType()` is fast enough that we don't need to cache it. + mFileHandleType = GetFileType(aFileHandle); + + if (mHasQueriedFilename) { + // `mHasQueriedFilename` indicates we already have a filename, add it to + // the cache with the now-known handle. + sHandleToFilenameCache->Add(aFileHandle, mFilename); + } + } + } + + const char* FileType() const override; + + void Filename(nsAString& aFilename) override; + + ~WinIOAutoObservation() { Report(); } + + private: + HANDLE mFileHandle; + DWORD mFileHandleType; + LARGE_INTEGER mOffset; + bool mHasQueriedFilename; + nsString mFilename; + static const char* sReference; +}; + +const char* WinIOAutoObservation::sReference = "PoisonIOInterposer"; + +// Get filename for this observation +void WinIOAutoObservation::Filename(nsAString& aFilename) { + // If mHasQueriedFilename is true, then filename is already stored in + // mFilename + if (mHasQueriedFilename) { + aFilename = mFilename; + return; + } + + if (mFileHandle) { + mFilename = sHandleToFilenameCache->FetchOrAdd(mFileHandle, [&]() { + nsString filename; + if (!mozilla::HandleToFilename(mFileHandle, mOffset, filename)) { + // HandleToFilename could fail (return false) but still have added + // something to `filename`, so it should be cleared in this case. + filename.Truncate(); + } + return filename; + }); + } + mHasQueriedFilename = true; + + aFilename = mFilename; +} + +const char* WinIOAutoObservation::FileType() const { + if (mFileHandle) { + switch (mFileHandleType) { + case FILE_TYPE_CHAR: + return "Char"; + case FILE_TYPE_DISK: + return "File"; + case FILE_TYPE_PIPE: + return "Pipe"; + case FILE_TYPE_REMOTE: + return "Remote"; + case FILE_TYPE_UNKNOWN: + default: + break; + } + } + // Fallback to base class default implementation. + return mozilla::IOInterposeObserver::Observation::FileType(); +} + +/*************************** IO Interposing Methods ***************************/ + +// Function pointers to original functions +static mozilla::WindowsDllInterceptor::FuncHookType<NtCreateFileFn> + gOriginalNtCreateFile; +static mozilla::WindowsDllInterceptor::FuncHookType<NtReadFileFn> + gOriginalNtReadFile; +static mozilla::WindowsDllInterceptor::FuncHookType<NtReadFileScatterFn> + gOriginalNtReadFileScatter; +static mozilla::WindowsDllInterceptor::FuncHookType<NtWriteFileFn> + gOriginalNtWriteFile; +static mozilla::WindowsDllInterceptor::FuncHookType<NtWriteFileGatherFn> + gOriginalNtWriteFileGather; +static mozilla::WindowsDllInterceptor::FuncHookType<NtFlushBuffersFileFn> + gOriginalNtFlushBuffersFile; +static mozilla::WindowsDllInterceptor::FuncHookType<NtQueryFullAttributesFileFn> + gOriginalNtQueryFullAttributesFile; + +static NTSTATUS NTAPI InterposedNtCreateFile( + PHANDLE aFileHandle, ACCESS_MASK aDesiredAccess, + POBJECT_ATTRIBUTES aObjectAttributes, PIO_STATUS_BLOCK aIoStatusBlock, + PLARGE_INTEGER aAllocationSize, ULONG aFileAttributes, ULONG aShareAccess, + ULONG aCreateDisposition, ULONG aCreateOptions, PVOID aEaBuffer, + ULONG aEaLength) { + // Something is badly wrong if this function is undefined + MOZ_ASSERT(gOriginalNtCreateFile); + + if (!mozilla::nt::RtlGetThreadLocalStoragePointer()) { + return gOriginalNtCreateFile( + aFileHandle, aDesiredAccess, aObjectAttributes, aIoStatusBlock, + aAllocationSize, aFileAttributes, aShareAccess, aCreateDisposition, + aCreateOptions, aEaBuffer, aEaLength); + } + + // Report IO + const wchar_t* buf = + aObjectAttributes ? aObjectAttributes->ObjectName->Buffer : L""; + uint32_t len = aObjectAttributes + ? aObjectAttributes->ObjectName->Length / sizeof(WCHAR) + : 0; + nsDependentSubstring filename(buf, len); + WinIOAutoObservation timer(mozilla::IOInterposeObserver::OpCreateOrOpen, + filename); + + // Execute original function + NTSTATUS status = gOriginalNtCreateFile( + aFileHandle, aDesiredAccess, aObjectAttributes, aIoStatusBlock, + aAllocationSize, aFileAttributes, aShareAccess, aCreateDisposition, + aCreateOptions, aEaBuffer, aEaLength); + if (NT_SUCCESS(status) && aFileHandle) { + timer.SetHandle(*aFileHandle); + } + return status; +} + +static NTSTATUS NTAPI InterposedNtReadFile(HANDLE aFileHandle, HANDLE aEvent, + PIO_APC_ROUTINE aApc, PVOID aApcCtx, + PIO_STATUS_BLOCK aIoStatus, + PVOID aBuffer, ULONG aLength, + PLARGE_INTEGER aOffset, + PULONG aKey) { + // Something is badly wrong if this function is undefined + MOZ_ASSERT(gOriginalNtReadFile); + + if (!mozilla::nt::RtlGetThreadLocalStoragePointer()) { + return gOriginalNtReadFile(aFileHandle, aEvent, aApc, aApcCtx, aIoStatus, + aBuffer, aLength, aOffset, aKey); + } + + // Report IO + WinIOAutoObservation timer(mozilla::IOInterposeObserver::OpRead, aFileHandle, + aOffset); + + // Execute original function + return gOriginalNtReadFile(aFileHandle, aEvent, aApc, aApcCtx, aIoStatus, + aBuffer, aLength, aOffset, aKey); +} + +static NTSTATUS NTAPI InterposedNtReadFileScatter( + HANDLE aFileHandle, HANDLE aEvent, PIO_APC_ROUTINE aApc, PVOID aApcCtx, + PIO_STATUS_BLOCK aIoStatus, FILE_SEGMENT_ELEMENT* aSegments, ULONG aLength, + PLARGE_INTEGER aOffset, PULONG aKey) { + // Something is badly wrong if this function is undefined + MOZ_ASSERT(gOriginalNtReadFileScatter); + + if (!mozilla::nt::RtlGetThreadLocalStoragePointer()) { + return gOriginalNtReadFileScatter(aFileHandle, aEvent, aApc, aApcCtx, + aIoStatus, aSegments, aLength, aOffset, + aKey); + } + + // Report IO + WinIOAutoObservation timer(mozilla::IOInterposeObserver::OpRead, aFileHandle, + aOffset); + + // Execute original function + return gOriginalNtReadFileScatter(aFileHandle, aEvent, aApc, aApcCtx, + aIoStatus, aSegments, aLength, aOffset, + aKey); +} + +// Interposed NtWriteFile function +static NTSTATUS NTAPI InterposedNtWriteFile(HANDLE aFileHandle, HANDLE aEvent, + PIO_APC_ROUTINE aApc, PVOID aApcCtx, + PIO_STATUS_BLOCK aIoStatus, + PVOID aBuffer, ULONG aLength, + PLARGE_INTEGER aOffset, + PULONG aKey) { + // Something is badly wrong if this function is undefined + MOZ_ASSERT(gOriginalNtWriteFile); + + if (!mozilla::nt::RtlGetThreadLocalStoragePointer()) { + return gOriginalNtWriteFile(aFileHandle, aEvent, aApc, aApcCtx, aIoStatus, + aBuffer, aLength, aOffset, aKey); + } + + // Report IO + WinIOAutoObservation timer(mozilla::IOInterposeObserver::OpWrite, aFileHandle, + aOffset); + + // Execute original function + return gOriginalNtWriteFile(aFileHandle, aEvent, aApc, aApcCtx, aIoStatus, + aBuffer, aLength, aOffset, aKey); +} + +// Interposed NtWriteFileGather function +static NTSTATUS NTAPI InterposedNtWriteFileGather( + HANDLE aFileHandle, HANDLE aEvent, PIO_APC_ROUTINE aApc, PVOID aApcCtx, + PIO_STATUS_BLOCK aIoStatus, FILE_SEGMENT_ELEMENT* aSegments, ULONG aLength, + PLARGE_INTEGER aOffset, PULONG aKey) { + // Something is badly wrong if this function is undefined + MOZ_ASSERT(gOriginalNtWriteFileGather); + + if (!mozilla::nt::RtlGetThreadLocalStoragePointer()) { + return gOriginalNtWriteFileGather(aFileHandle, aEvent, aApc, aApcCtx, + aIoStatus, aSegments, aLength, aOffset, + aKey); + } + + // Report IO + WinIOAutoObservation timer(mozilla::IOInterposeObserver::OpWrite, aFileHandle, + aOffset); + + // Execute original function + return gOriginalNtWriteFileGather(aFileHandle, aEvent, aApc, aApcCtx, + aIoStatus, aSegments, aLength, aOffset, + aKey); +} + +static NTSTATUS NTAPI InterposedNtFlushBuffersFile( + HANDLE aFileHandle, PIO_STATUS_BLOCK aIoStatusBlock) { + // Something is badly wrong if this function is undefined + MOZ_ASSERT(gOriginalNtFlushBuffersFile); + + if (!mozilla::nt::RtlGetThreadLocalStoragePointer()) { + return gOriginalNtFlushBuffersFile(aFileHandle, aIoStatusBlock); + } + + // Report IO + WinIOAutoObservation timer(mozilla::IOInterposeObserver::OpFSync, aFileHandle, + nullptr); + + // Execute original function + return gOriginalNtFlushBuffersFile(aFileHandle, aIoStatusBlock); +} + +static NTSTATUS NTAPI InterposedNtQueryFullAttributesFile( + POBJECT_ATTRIBUTES aObjectAttributes, + PFILE_NETWORK_OPEN_INFORMATION aFileInformation) { + // Something is badly wrong if this function is undefined + MOZ_ASSERT(gOriginalNtQueryFullAttributesFile); + + if (!mozilla::nt::RtlGetThreadLocalStoragePointer()) { + return gOriginalNtQueryFullAttributesFile(aObjectAttributes, + aFileInformation); + } + + // Report IO + const wchar_t* buf = + aObjectAttributes ? aObjectAttributes->ObjectName->Buffer : L""; + uint32_t len = aObjectAttributes + ? aObjectAttributes->ObjectName->Length / sizeof(WCHAR) + : 0; + nsDependentSubstring filename(buf, len); + WinIOAutoObservation timer(mozilla::IOInterposeObserver::OpStat, filename); + + // Execute original function + return gOriginalNtQueryFullAttributesFile(aObjectAttributes, + aFileInformation); +} + +} // namespace + +/******************************** IO Poisoning ********************************/ + +// Windows DLL interceptor +static mozilla::WindowsDllInterceptor sNtDllInterceptor; + +namespace mozilla { + +void InitPoisonIOInterposer() { + // Currently we hook the functions not early enough to precede third-party + // injections. Until we implement a compatible way e.g. applying a hook + // in the parent process (bug 1646804), we skip interposing functions under + // the known condition(s). + + // Bug 1679741: Kingsoft Internet Security calls NtReadFile in their thread + // simultaneously when we're applying a hook on NtReadFile. + if (::GetModuleHandleW(L"kwsui64.dll")) { + return; + } + + // Don't poison twice... as this function may only be invoked on the main + // thread when no other threads are running, it safe to allow multiple calls + // to InitPoisonIOInterposer() without complaining (ie. failing assertions). + if (sIOPoisoned) { + return; + } + sIOPoisoned = true; + + MOZ_RELEASE_ASSERT(!sHandleToFilenameCache); + sHandleToFilenameCache = mozilla::MakeUnique<HandleToFilenameCache>(); + mozilla::RunOnShutdown([]() { + // The interposer may still be active after the final shutdown phase + // (especially since ClearPoisonIOInterposer() is never called, see bug + // 1647107), so we cannot just reset the pointer. Instead we put the cache + // in shutdown mode, to clear its memory and stop caching operations. + sHandleToFilenameCache->Shutdown(); + }); + + // Stdout and Stderr are OK. + MozillaRegisterDebugFD(1); + if (::GetStdHandle(STD_OUTPUT_HANDLE) != ::GetStdHandle(STD_ERROR_HANDLE)) { + MozillaRegisterDebugFD(2); + } + +#ifdef MOZ_REPLACE_MALLOC + // The contract with InitDebugFd is that the given registry can be used + // at any moment, so the instance needs to persist longer than the scope + // of this functions. + static DebugFdRegistry registry; + ReplaceMalloc::InitDebugFd(registry); +#endif + + // Initialize dll interceptor and add hooks + sNtDllInterceptor.Init("ntdll.dll"); + gOriginalNtCreateFile.Set(sNtDllInterceptor, "NtCreateFile", + &InterposedNtCreateFile); + gOriginalNtReadFile.Set(sNtDllInterceptor, "NtReadFile", + &InterposedNtReadFile); + gOriginalNtReadFileScatter.Set(sNtDllInterceptor, "NtReadFileScatter", + &InterposedNtReadFileScatter); + gOriginalNtWriteFile.Set(sNtDllInterceptor, "NtWriteFile", + &InterposedNtWriteFile); + gOriginalNtWriteFileGather.Set(sNtDllInterceptor, "NtWriteFileGather", + &InterposedNtWriteFileGather); + gOriginalNtFlushBuffersFile.Set(sNtDllInterceptor, "NtFlushBuffersFile", + &InterposedNtFlushBuffersFile); + gOriginalNtQueryFullAttributesFile.Set(sNtDllInterceptor, + "NtQueryFullAttributesFile", + &InterposedNtQueryFullAttributesFile); +} + +void ClearPoisonIOInterposer() { + MOZ_ASSERT(false, "Never called! See bug 1647107"); + if (sIOPoisoned) { + // Destroy the DLL interceptor + sIOPoisoned = false; + sNtDllInterceptor.Clear(); + sHandleToFilenameCache->Clear(); + } +} + +} // namespace mozilla |