forked from mirrors/gecko-dev
fee87c9b39
We hook several file APIs to record I/O performance data. Since TLS is not allocated in ntdll's loader worker thread, however, if someone does a file operation, we hit read AV because `WinIOAutoObservation` uses `nsString` and a thread local variable. Currently we can see this crash happens only when a DLL rule of AppLocker is defined, but theoretically this can happen when any module loaded in a worker thread does file operation in its entrypoint. The proposed fix is to skip `WinIOAutoObservation` if TLS is not available. Differential Revision: https://phabricator.services.mozilla.com/D113032
496 lines
19 KiB
C++
496 lines
19 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "PoisonIOInterposer.h"
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#include <algorithm>
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#include <stdio.h>
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#include <vector>
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#include <io.h>
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#include <windows.h>
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#include <winternl.h>
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#include "mozilla/Assertions.h"
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#include "mozilla/ClearOnShutdown.h"
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#include "mozilla/FileUtilsWin.h"
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#include "mozilla/IOInterposer.h"
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#include "mozilla/Mutex.h"
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#include "mozilla/NativeNt.h"
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#include "mozilla/SmallArrayLRUCache.h"
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#include "mozilla/TimeStamp.h"
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#include "mozilla/UniquePtr.h"
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#include "nsTArray.h"
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#include "nsWindowsDllInterceptor.h"
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#include "plstr.h"
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#ifdef MOZ_REPLACE_MALLOC
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# include "replace_malloc_bridge.h"
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#endif
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namespace {
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// Keep track of poisoned state. Notice that there is no reason to lock access
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// to this variable as it's only changed in InitPoisonIOInterposer and
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// ClearPoisonIOInterposer which may only be called on the main-thread when no
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// other threads are running.
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static bool sIOPoisoned = false;
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/************************ Internal NT API Declarations ************************/
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/*
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* Function pointer declaration for internal NT routine to create/open files.
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* For documentation on the NtCreateFile routine, see MSDN.
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*/
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typedef NTSTATUS(NTAPI* NtCreateFileFn)(
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PHANDLE aFileHandle, ACCESS_MASK aDesiredAccess,
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POBJECT_ATTRIBUTES aObjectAttributes, PIO_STATUS_BLOCK aIoStatusBlock,
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PLARGE_INTEGER aAllocationSize, ULONG aFileAttributes, ULONG aShareAccess,
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ULONG aCreateDisposition, ULONG aCreateOptions, PVOID aEaBuffer,
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ULONG aEaLength);
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/**
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* Function pointer declaration for internal NT routine to read data from file.
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* For documentation on the NtReadFile routine, see ZwReadFile on MSDN.
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*/
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typedef NTSTATUS(NTAPI* NtReadFileFn)(HANDLE aFileHandle, HANDLE aEvent,
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PIO_APC_ROUTINE aApc, PVOID aApcCtx,
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PIO_STATUS_BLOCK aIoStatus, PVOID aBuffer,
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ULONG aLength, PLARGE_INTEGER aOffset,
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PULONG aKey);
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/**
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* Function pointer declaration for internal NT routine to read data from file.
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* No documentation exists, see wine sources for details.
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*/
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typedef NTSTATUS(NTAPI* NtReadFileScatterFn)(
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HANDLE aFileHandle, HANDLE aEvent, PIO_APC_ROUTINE aApc, PVOID aApcCtx,
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PIO_STATUS_BLOCK aIoStatus, FILE_SEGMENT_ELEMENT* aSegments, ULONG aLength,
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PLARGE_INTEGER aOffset, PULONG aKey);
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/**
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* Function pointer declaration for internal NT routine to write data to file.
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* For documentation on the NtWriteFile routine, see ZwWriteFile on MSDN.
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*/
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typedef NTSTATUS(NTAPI* NtWriteFileFn)(HANDLE aFileHandle, HANDLE aEvent,
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PIO_APC_ROUTINE aApc, PVOID aApcCtx,
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PIO_STATUS_BLOCK aIoStatus,
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PVOID aBuffer, ULONG aLength,
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PLARGE_INTEGER aOffset, PULONG aKey);
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/**
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* Function pointer declaration for internal NT routine to write data to file.
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* No documentation exists, see wine sources for details.
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*/
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typedef NTSTATUS(NTAPI* NtWriteFileGatherFn)(
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HANDLE aFileHandle, HANDLE aEvent, PIO_APC_ROUTINE aApc, PVOID aApcCtx,
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PIO_STATUS_BLOCK aIoStatus, FILE_SEGMENT_ELEMENT* aSegments, ULONG aLength,
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PLARGE_INTEGER aOffset, PULONG aKey);
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/**
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* Function pointer declaration for internal NT routine to flush to disk.
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* For documentation on the NtFlushBuffersFile routine, see ZwFlushBuffersFile
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* on MSDN.
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*/
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typedef NTSTATUS(NTAPI* NtFlushBuffersFileFn)(HANDLE aFileHandle,
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PIO_STATUS_BLOCK aIoStatusBlock);
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typedef struct _FILE_NETWORK_OPEN_INFORMATION* PFILE_NETWORK_OPEN_INFORMATION;
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/**
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* Function pointer delaration for internal NT routine to query file attributes.
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* (equivalent to stat)
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*/
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typedef NTSTATUS(NTAPI* NtQueryFullAttributesFileFn)(
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POBJECT_ATTRIBUTES aObjectAttributes,
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PFILE_NETWORK_OPEN_INFORMATION aFileInformation);
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/*************************** Auxiliary Declarations ***************************/
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// Cache of filenames associated with handles.
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// `static` to be shared between all calls to `Filename()`.
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// This assumes handles are not reused, at least within a windows of 32
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// handles.
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// Profiling showed that during startup, around half of `Filename()` calls are
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// resolved with the first entry (best case), and 32 entries cover >95% of
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// cases, reducing the average `Filename()` cost by 5-10x.
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using HandleToFilenameCache = mozilla::SmallArrayLRUCache<HANDLE, nsString, 32>;
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static mozilla::UniquePtr<HandleToFilenameCache> sHandleToFilenameCache;
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/**
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* RAII class for timing the duration of an I/O call and reporting the result
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* to the mozilla::IOInterposeObserver API.
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*/
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class WinIOAutoObservation : public mozilla::IOInterposeObserver::Observation {
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public:
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WinIOAutoObservation(mozilla::IOInterposeObserver::Operation aOp,
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HANDLE aFileHandle, const LARGE_INTEGER* aOffset)
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: mozilla::IOInterposeObserver::Observation(
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aOp, sReference,
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!mozilla::IsDebugFile(reinterpret_cast<intptr_t>(aFileHandle))),
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mFileHandle(aFileHandle),
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mFileHandleType(GetFileType(aFileHandle)),
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mHasQueriedFilename(false) {
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if (mShouldReport) {
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mOffset.QuadPart = aOffset ? aOffset->QuadPart : 0;
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}
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}
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WinIOAutoObservation(mozilla::IOInterposeObserver::Operation aOp,
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nsAString& aFilename)
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: mozilla::IOInterposeObserver::Observation(aOp, sReference),
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mFileHandle(nullptr),
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mFileHandleType(FILE_TYPE_UNKNOWN),
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mHasQueriedFilename(false) {
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if (mShouldReport) {
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nsAutoString dosPath;
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if (mozilla::NtPathToDosPath(aFilename, dosPath)) {
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mFilename = dosPath;
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} else {
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// If we can't get a dosPath, what we have is better than nothing.
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mFilename = aFilename;
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}
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mHasQueriedFilename = true;
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mOffset.QuadPart = 0;
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}
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}
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void SetHandle(HANDLE aFileHandle) {
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mFileHandle = aFileHandle;
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if (aFileHandle) {
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// Note: `GetFileType()` is fast enough that we don't need to cache it.
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mFileHandleType = GetFileType(aFileHandle);
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if (mHasQueriedFilename) {
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// `mHasQueriedFilename` indicates we already have a filename, add it to
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// the cache with the now-known handle.
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sHandleToFilenameCache->Add(aFileHandle, mFilename);
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}
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}
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}
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const char* FileType() const override;
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void Filename(nsAString& aFilename) override;
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~WinIOAutoObservation() { Report(); }
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private:
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HANDLE mFileHandle;
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DWORD mFileHandleType;
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LARGE_INTEGER mOffset;
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bool mHasQueriedFilename;
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nsString mFilename;
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static const char* sReference;
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};
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const char* WinIOAutoObservation::sReference = "PoisonIOInterposer";
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// Get filename for this observation
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void WinIOAutoObservation::Filename(nsAString& aFilename) {
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// If mHasQueriedFilename is true, then filename is already stored in
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// mFilename
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if (mHasQueriedFilename) {
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aFilename = mFilename;
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return;
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}
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if (mFileHandle) {
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mFilename = sHandleToFilenameCache->FetchOrAdd(mFileHandle, [&]() {
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nsString filename;
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if (!mozilla::HandleToFilename(mFileHandle, mOffset, filename)) {
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// HandleToFilename could fail (return false) but still have added
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// something to `filename`, so it should be cleared in this case.
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filename.Truncate();
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}
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return filename;
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});
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}
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mHasQueriedFilename = true;
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aFilename = mFilename;
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}
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const char* WinIOAutoObservation::FileType() const {
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if (mFileHandle) {
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switch (mFileHandleType) {
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case FILE_TYPE_CHAR:
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return "Char";
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case FILE_TYPE_DISK:
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return "File";
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case FILE_TYPE_PIPE:
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return "Pipe";
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case FILE_TYPE_REMOTE:
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return "Remote";
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case FILE_TYPE_UNKNOWN:
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default:
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break;
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}
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}
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// Fallback to base class default implementation.
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return mozilla::IOInterposeObserver::Observation::FileType();
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}
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/*************************** IO Interposing Methods ***************************/
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// Function pointers to original functions
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static mozilla::WindowsDllInterceptor::FuncHookType<NtCreateFileFn>
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gOriginalNtCreateFile;
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static mozilla::WindowsDllInterceptor::FuncHookType<NtReadFileFn>
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gOriginalNtReadFile;
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static mozilla::WindowsDllInterceptor::FuncHookType<NtReadFileScatterFn>
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gOriginalNtReadFileScatter;
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static mozilla::WindowsDllInterceptor::FuncHookType<NtWriteFileFn>
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gOriginalNtWriteFile;
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static mozilla::WindowsDllInterceptor::FuncHookType<NtWriteFileGatherFn>
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gOriginalNtWriteFileGather;
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static mozilla::WindowsDllInterceptor::FuncHookType<NtFlushBuffersFileFn>
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gOriginalNtFlushBuffersFile;
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static mozilla::WindowsDllInterceptor::FuncHookType<NtQueryFullAttributesFileFn>
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gOriginalNtQueryFullAttributesFile;
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static NTSTATUS NTAPI InterposedNtCreateFile(
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PHANDLE aFileHandle, ACCESS_MASK aDesiredAccess,
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POBJECT_ATTRIBUTES aObjectAttributes, PIO_STATUS_BLOCK aIoStatusBlock,
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PLARGE_INTEGER aAllocationSize, ULONG aFileAttributes, ULONG aShareAccess,
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ULONG aCreateDisposition, ULONG aCreateOptions, PVOID aEaBuffer,
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ULONG aEaLength) {
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// Something is badly wrong if this function is undefined
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MOZ_ASSERT(gOriginalNtCreateFile);
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if (!mozilla::nt::RtlGetThreadLocalStoragePointer()) {
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return gOriginalNtCreateFile(
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aFileHandle, aDesiredAccess, aObjectAttributes, aIoStatusBlock,
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aAllocationSize, aFileAttributes, aShareAccess, aCreateDisposition,
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aCreateOptions, aEaBuffer, aEaLength);
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}
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// Report IO
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const wchar_t* buf =
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aObjectAttributes ? aObjectAttributes->ObjectName->Buffer : L"";
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uint32_t len = aObjectAttributes
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? aObjectAttributes->ObjectName->Length / sizeof(WCHAR)
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: 0;
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nsDependentSubstring filename(buf, len);
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WinIOAutoObservation timer(mozilla::IOInterposeObserver::OpCreateOrOpen,
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filename);
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// Execute original function
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NTSTATUS status = gOriginalNtCreateFile(
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aFileHandle, aDesiredAccess, aObjectAttributes, aIoStatusBlock,
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aAllocationSize, aFileAttributes, aShareAccess, aCreateDisposition,
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aCreateOptions, aEaBuffer, aEaLength);
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if (NT_SUCCESS(status) && aFileHandle) {
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timer.SetHandle(*aFileHandle);
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}
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return status;
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}
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static NTSTATUS NTAPI InterposedNtReadFile(HANDLE aFileHandle, HANDLE aEvent,
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PIO_APC_ROUTINE aApc, PVOID aApcCtx,
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PIO_STATUS_BLOCK aIoStatus,
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PVOID aBuffer, ULONG aLength,
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PLARGE_INTEGER aOffset,
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PULONG aKey) {
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// Something is badly wrong if this function is undefined
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MOZ_ASSERT(gOriginalNtReadFile);
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if (!mozilla::nt::RtlGetThreadLocalStoragePointer()) {
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return gOriginalNtReadFile(aFileHandle, aEvent, aApc, aApcCtx, aIoStatus,
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aBuffer, aLength, aOffset, aKey);
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}
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// Report IO
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WinIOAutoObservation timer(mozilla::IOInterposeObserver::OpRead, aFileHandle,
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aOffset);
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// Execute original function
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return gOriginalNtReadFile(aFileHandle, aEvent, aApc, aApcCtx, aIoStatus,
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aBuffer, aLength, aOffset, aKey);
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}
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static NTSTATUS NTAPI InterposedNtReadFileScatter(
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HANDLE aFileHandle, HANDLE aEvent, PIO_APC_ROUTINE aApc, PVOID aApcCtx,
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PIO_STATUS_BLOCK aIoStatus, FILE_SEGMENT_ELEMENT* aSegments, ULONG aLength,
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PLARGE_INTEGER aOffset, PULONG aKey) {
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// Something is badly wrong if this function is undefined
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MOZ_ASSERT(gOriginalNtReadFileScatter);
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if (!mozilla::nt::RtlGetThreadLocalStoragePointer()) {
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return gOriginalNtReadFileScatter(aFileHandle, aEvent, aApc, aApcCtx,
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aIoStatus, aSegments, aLength, aOffset,
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aKey);
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}
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// Report IO
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WinIOAutoObservation timer(mozilla::IOInterposeObserver::OpRead, aFileHandle,
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aOffset);
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// Execute original function
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return gOriginalNtReadFileScatter(aFileHandle, aEvent, aApc, aApcCtx,
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aIoStatus, aSegments, aLength, aOffset,
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aKey);
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}
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// Interposed NtWriteFile function
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static NTSTATUS NTAPI InterposedNtWriteFile(HANDLE aFileHandle, HANDLE aEvent,
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PIO_APC_ROUTINE aApc, PVOID aApcCtx,
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PIO_STATUS_BLOCK aIoStatus,
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PVOID aBuffer, ULONG aLength,
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PLARGE_INTEGER aOffset,
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PULONG aKey) {
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// Something is badly wrong if this function is undefined
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MOZ_ASSERT(gOriginalNtWriteFile);
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if (!mozilla::nt::RtlGetThreadLocalStoragePointer()) {
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return gOriginalNtWriteFile(aFileHandle, aEvent, aApc, aApcCtx, aIoStatus,
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aBuffer, aLength, aOffset, aKey);
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}
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// Report IO
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WinIOAutoObservation timer(mozilla::IOInterposeObserver::OpWrite, aFileHandle,
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aOffset);
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// Execute original function
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return gOriginalNtWriteFile(aFileHandle, aEvent, aApc, aApcCtx, aIoStatus,
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aBuffer, aLength, aOffset, aKey);
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}
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// Interposed NtWriteFileGather function
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static NTSTATUS NTAPI InterposedNtWriteFileGather(
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HANDLE aFileHandle, HANDLE aEvent, PIO_APC_ROUTINE aApc, PVOID aApcCtx,
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PIO_STATUS_BLOCK aIoStatus, FILE_SEGMENT_ELEMENT* aSegments, ULONG aLength,
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PLARGE_INTEGER aOffset, PULONG aKey) {
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// Something is badly wrong if this function is undefined
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MOZ_ASSERT(gOriginalNtWriteFileGather);
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if (!mozilla::nt::RtlGetThreadLocalStoragePointer()) {
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return gOriginalNtWriteFileGather(aFileHandle, aEvent, aApc, aApcCtx,
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aIoStatus, aSegments, aLength, aOffset,
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aKey);
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}
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// Report IO
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WinIOAutoObservation timer(mozilla::IOInterposeObserver::OpWrite, aFileHandle,
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aOffset);
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// Execute original function
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return gOriginalNtWriteFileGather(aFileHandle, aEvent, aApc, aApcCtx,
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aIoStatus, aSegments, aLength, aOffset,
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aKey);
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}
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static NTSTATUS NTAPI InterposedNtFlushBuffersFile(
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HANDLE aFileHandle, PIO_STATUS_BLOCK aIoStatusBlock) {
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// Something is badly wrong if this function is undefined
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MOZ_ASSERT(gOriginalNtFlushBuffersFile);
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if (!mozilla::nt::RtlGetThreadLocalStoragePointer()) {
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return gOriginalNtFlushBuffersFile(aFileHandle, aIoStatusBlock);
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}
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// Report IO
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WinIOAutoObservation timer(mozilla::IOInterposeObserver::OpFSync, aFileHandle,
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nullptr);
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// Execute original function
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return gOriginalNtFlushBuffersFile(aFileHandle, aIoStatusBlock);
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}
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static NTSTATUS NTAPI InterposedNtQueryFullAttributesFile(
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POBJECT_ATTRIBUTES aObjectAttributes,
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PFILE_NETWORK_OPEN_INFORMATION aFileInformation) {
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// Something is badly wrong if this function is undefined
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MOZ_ASSERT(gOriginalNtQueryFullAttributesFile);
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if (!mozilla::nt::RtlGetThreadLocalStoragePointer()) {
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return gOriginalNtQueryFullAttributesFile(aObjectAttributes,
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aFileInformation);
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}
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// Report IO
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const wchar_t* buf =
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aObjectAttributes ? aObjectAttributes->ObjectName->Buffer : L"";
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uint32_t len = aObjectAttributes
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? aObjectAttributes->ObjectName->Length / sizeof(WCHAR)
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: 0;
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nsDependentSubstring filename(buf, len);
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WinIOAutoObservation timer(mozilla::IOInterposeObserver::OpStat, filename);
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// Execute original function
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return gOriginalNtQueryFullAttributesFile(aObjectAttributes,
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aFileInformation);
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}
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} // namespace
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/******************************** IO Poisoning ********************************/
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// Windows DLL interceptor
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static mozilla::WindowsDllInterceptor sNtDllInterceptor;
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namespace mozilla {
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void InitPoisonIOInterposer() {
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// Don't poison twice... as this function may only be invoked on the main
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// thread when no other threads are running, it safe to allow multiple calls
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// to InitPoisonIOInterposer() without complaining (ie. failing assertions).
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if (sIOPoisoned) {
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return;
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}
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sIOPoisoned = true;
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MOZ_RELEASE_ASSERT(!sHandleToFilenameCache);
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sHandleToFilenameCache = mozilla::MakeUnique<HandleToFilenameCache>();
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mozilla::RunOnShutdown([]() {
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// The interposer may still be active after the final shutdown phase
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// (especially since ClearPoisonIOInterposer() is never called, see bug
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// 1647107), so we cannot just reset the pointer. Instead we put the cache
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// in shutdown mode, to clear its memory and stop caching operations.
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sHandleToFilenameCache->Shutdown();
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});
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// Stdout and Stderr are OK.
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MozillaRegisterDebugFD(1);
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MozillaRegisterDebugFD(2);
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#ifdef MOZ_REPLACE_MALLOC
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// The contract with InitDebugFd is that the given registry can be used
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// at any moment, so the instance needs to persist longer than the scope
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// of this functions.
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static DebugFdRegistry registry;
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ReplaceMalloc::InitDebugFd(registry);
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#endif
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// Initialize dll interceptor and add hooks
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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
|