зеркало из https://github.com/mozilla/gecko-dev.git
635 строки
18 KiB
C++
635 строки
18 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: sw=2 ts=8 et :
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*/
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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 "Shmem.h"
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#include "ProtocolUtils.h"
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#include "SharedMemoryBasic.h"
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#include "SharedMemorySysV.h"
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#include "nsAutoPtr.h"
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#include "mozilla/unused.h"
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namespace mozilla {
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namespace ipc {
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class ShmemCreated : public IPC::Message
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{
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private:
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typedef Shmem::id_t id_t;
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public:
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ShmemCreated(int32_t routingId,
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const id_t& aIPDLId,
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const size_t& aSize,
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const SharedMemoryBasic::Handle& aHandle) :
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IPC::Message(routingId, SHMEM_CREATED_MESSAGE_TYPE, PRIORITY_NORMAL)
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{
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IPC::WriteParam(this, aIPDLId);
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IPC::WriteParam(this, aSize);
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IPC::WriteParam(this, int32_t(SharedMemory::TYPE_BASIC)),
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IPC::WriteParam(this, aHandle);
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}
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// Instead of a single Read() function, we have ReadInfo() and
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// ReadHandle(). The reason is that the handle type is specific to
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// the shmem type. These functions should only be called in the
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// order ReadInfo(); ReadHandle();, and only once each.
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static bool
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ReadInfo(const Message* msg, void** iter,
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id_t* aIPDLId,
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size_t* aSize,
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SharedMemory::SharedMemoryType* aType)
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{
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if (!IPC::ReadParam(msg, iter, aIPDLId) ||
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!IPC::ReadParam(msg, iter, aSize) ||
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!IPC::ReadParam(msg, iter, reinterpret_cast<int32_t*>(aType)))
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return false;
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return true;
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}
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static bool
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ReadHandle(const Message* msg, void** iter,
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SharedMemoryBasic::Handle* aHandle)
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{
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if (!IPC::ReadParam(msg, iter, aHandle))
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return false;
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msg->EndRead(*iter);
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return true;
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}
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#ifdef MOZ_HAVE_SHAREDMEMORYSYSV
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ShmemCreated(int32_t routingId,
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const id_t& aIPDLId,
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const size_t& aSize,
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const SharedMemorySysV::Handle& aHandle) :
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IPC::Message(routingId, SHMEM_CREATED_MESSAGE_TYPE, PRIORITY_NORMAL)
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{
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IPC::WriteParam(this, aIPDLId);
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IPC::WriteParam(this, aSize);
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IPC::WriteParam(this, int32_t(SharedMemory::TYPE_SYSV)),
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IPC::WriteParam(this, aHandle);
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}
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static bool
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ReadHandle(const Message* msg, void** iter,
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SharedMemorySysV::Handle* aHandle)
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{
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if (!IPC::ReadParam(msg, iter, aHandle))
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return false;
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msg->EndRead(*iter);
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return true;
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}
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#endif
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void Log(const std::string& aPrefix,
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FILE* aOutf) const
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{
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fputs("(special ShmemCreated msg)", aOutf);
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}
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};
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class ShmemDestroyed : public IPC::Message
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{
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private:
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typedef Shmem::id_t id_t;
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public:
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ShmemDestroyed(int32_t routingId,
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const id_t& aIPDLId) :
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IPC::Message(routingId, SHMEM_DESTROYED_MESSAGE_TYPE, PRIORITY_NORMAL)
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{
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IPC::WriteParam(this, aIPDLId);
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}
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};
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#ifdef MOZ_HAVE_SHAREDMEMORYSYSV
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static Shmem::SharedMemory*
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CreateSegment(size_t aNBytes, SharedMemorySysV::Handle aHandle)
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{
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nsAutoPtr<SharedMemory> segment;
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if (SharedMemorySysV::IsHandleValid(aHandle)) {
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segment = new SharedMemorySysV(aHandle);
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}
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else {
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segment = new SharedMemorySysV();
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if (!segment->Create(aNBytes))
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return 0;
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}
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if (!segment->Map(aNBytes))
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return 0;
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segment->AddRef();
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return segment.forget();
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}
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#endif
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static Shmem::SharedMemory*
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CreateSegment(size_t aNBytes, SharedMemoryBasic::Handle aHandle)
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{
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nsAutoPtr<SharedMemory> segment;
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if (SharedMemoryBasic::IsHandleValid(aHandle)) {
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segment = new SharedMemoryBasic(aHandle);
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}
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else {
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segment = new SharedMemoryBasic();
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if (!segment->Create(aNBytes))
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return 0;
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}
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if (!segment->Map(aNBytes))
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return 0;
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segment->AddRef();
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return segment.forget();
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}
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static void
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DestroySegment(SharedMemory* aSegment)
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{
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// the SharedMemory dtor closes and unmaps the actual OS shmem segment
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if (aSegment)
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aSegment->Release();
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}
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#if defined(DEBUG)
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static const char sMagic[] =
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"This little piggy went to market.\n"
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"This little piggy stayed at home.\n"
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"This little piggy has roast beef,\n"
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"This little piggy had none.\n"
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"And this little piggy cried \"Wee! Wee! Wee!\" all the way home";
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struct Header {
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// Don't use size_t or bool here because their size depends on the
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// architecture.
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uint32_t mSize;
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uint32_t mUnsafe;
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char mMagic[sizeof(sMagic)];
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};
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static void
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GetSections(Shmem::SharedMemory* aSegment,
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Header** aHeader,
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char** aFrontSentinel,
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char** aData,
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char** aBackSentinel)
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{
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NS_ABORT_IF_FALSE(aSegment && aFrontSentinel && aData && aBackSentinel,
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"NULL param(s)");
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*aFrontSentinel = reinterpret_cast<char*>(aSegment->memory());
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NS_ABORT_IF_FALSE(*aFrontSentinel, "NULL memory()");
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*aHeader = reinterpret_cast<Header*>(*aFrontSentinel);
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size_t pageSize = Shmem::SharedMemory::SystemPageSize();
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*aData = *aFrontSentinel + pageSize;
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*aBackSentinel = *aFrontSentinel + aSegment->Size() - pageSize;
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}
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static Header*
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GetHeader(Shmem::SharedMemory* aSegment)
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{
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Header* header;
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char* dontcare;
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GetSections(aSegment, &header, &dontcare, &dontcare, &dontcare);
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return header;
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}
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static void
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Protect(SharedMemory* aSegment)
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{
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NS_ABORT_IF_FALSE(aSegment, "NULL segment");
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aSegment->Protect(reinterpret_cast<char*>(aSegment->memory()),
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aSegment->Size(),
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RightsNone);
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}
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static void
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Unprotect(SharedMemory* aSegment)
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{
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NS_ABORT_IF_FALSE(aSegment, "NULL segment");
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aSegment->Protect(reinterpret_cast<char*>(aSegment->memory()),
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aSegment->Size(),
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RightsRead | RightsWrite);
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}
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//
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// In debug builds, we specially allocate shmem segments. The layout
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// is as follows
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//
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// Page 0: "front sentinel"
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// size of mapping
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// magic bytes
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// Page 1 through n-1:
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// user data
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// Page n: "back sentinel"
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// [nothing]
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//
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// The mapping can be in one of the following states, wrt to the
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// current process.
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//
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// State "unmapped": all pages are mapped with no access rights.
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//
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// State "mapping": all pages are mapped with read/write access.
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//
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// State "mapped": the front and back sentinels are mapped with no
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// access rights, and all the other pages are mapped with
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// read/write access.
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//
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// When a SharedMemory segment is first allocated, it starts out in
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// the "mapping" state for the process that allocates the segment, and
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// in the "unmapped" state for the other process. The allocating
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// process will then create a Shmem, which takes the segment into the
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// "mapped" state, where it can be accessed by clients.
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//
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// When a Shmem is sent to another process in an IPDL message, the
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// segment transitions into the "unmapped" state for the sending
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// process, and into the "mapping" state for the receiving process.
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// The receiving process will then create a Shmem from the underlying
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// segment, and take the segment into the "mapped" state.
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//
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// In the "mapping" state, we use the front sentinel to verify the
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// integrity of the shmem segment. If valid, it has a size_t
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// containing the number of bytes the user allocated followed by the
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// magic bytes above.
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//
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// In the "mapped" state, the front and back sentinels have no access
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// rights. They act as guards against buffer overflows and underflows
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// in client code; if clients touch a sentinel, they die with SIGSEGV.
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//
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// The "unmapped" state is used to enforce single-owner semantics of
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// the shmem segment. If a process other than the current owner tries
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// to touch the segment, it dies with SIGSEGV.
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//
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Shmem::Shmem(IHadBetterBeIPDLCodeCallingThis_OtherwiseIAmADoodyhead,
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SharedMemory* aSegment, id_t aId) :
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mSegment(aSegment),
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mData(0),
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mSize(0)
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{
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NS_ABORT_IF_FALSE(mSegment, "NULL segment");
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NS_ABORT_IF_FALSE(aId != 0, "invalid ID");
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Unprotect(mSegment);
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Header* header;
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char* frontSentinel;
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char* data;
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char* backSentinel;
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GetSections(aSegment, &header, &frontSentinel, &data, &backSentinel);
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// do a quick validity check to avoid weird-looking crashes in libc
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char check = *frontSentinel;
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(void)check;
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NS_ABORT_IF_FALSE(!strncmp(header->mMagic, sMagic, sizeof(sMagic)),
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"invalid segment");
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mSize = static_cast<size_t>(header->mSize);
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size_t pageSize = SharedMemory::SystemPageSize();
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// transition into the "mapped" state by protecting the front and
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// back sentinels (which guard against buffer under/overflows)
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mSegment->Protect(frontSentinel, pageSize, RightsNone);
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mSegment->Protect(backSentinel, pageSize, RightsNone);
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// don't set these until we know they're valid
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mData = data;
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mId = aId;
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}
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void
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Shmem::AssertInvariants() const
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{
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NS_ABORT_IF_FALSE(mSegment, "NULL segment");
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NS_ABORT_IF_FALSE(mData, "NULL data pointer");
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NS_ABORT_IF_FALSE(mSize > 0, "invalid size");
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// if the segment isn't owned by the current process, these will
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// trigger SIGSEGV
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char checkMappingFront = *reinterpret_cast<char*>(mData);
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char checkMappingBack = *(reinterpret_cast<char*>(mData) + mSize - 1);
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// avoid "unused" warnings for these variables:
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unused << checkMappingFront;
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unused << checkMappingBack;
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}
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void
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Shmem::RevokeRights(IHadBetterBeIPDLCodeCallingThis_OtherwiseIAmADoodyhead)
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{
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AssertInvariants();
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size_t pageSize = SharedMemory::SystemPageSize();
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Header* header = GetHeader(mSegment);
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// Open this up for reading temporarily
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mSegment->Protect(reinterpret_cast<char*>(header), pageSize, RightsRead);
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if (!header->mUnsafe) {
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Protect(mSegment);
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} else {
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mSegment->Protect(reinterpret_cast<char*>(header), pageSize, RightsNone);
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}
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}
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// static
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Shmem::SharedMemory*
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Shmem::Alloc(IHadBetterBeIPDLCodeCallingThis_OtherwiseIAmADoodyhead,
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size_t aNBytes,
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SharedMemoryType aType,
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bool aUnsafe,
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bool aProtect)
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{
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NS_ASSERTION(aNBytes <= UINT32_MAX, "Will truncate shmem segment size!");
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NS_ABORT_IF_FALSE(!aProtect || !aUnsafe, "protect => !unsafe");
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size_t pageSize = SharedMemory::SystemPageSize();
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SharedMemory* segment = nullptr;
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// |2*pageSize| is for the front and back sentinel
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size_t segmentSize = SharedMemory::PageAlignedSize(aNBytes + 2*pageSize);
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if (aType == SharedMemory::TYPE_BASIC)
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segment = CreateSegment(segmentSize, SharedMemoryBasic::NULLHandle());
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#ifdef MOZ_HAVE_SHAREDMEMORYSYSV
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else if (aType == SharedMemory::TYPE_SYSV)
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segment = CreateSegment(segmentSize, SharedMemorySysV::NULLHandle());
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#endif
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else
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NS_RUNTIMEABORT("unknown shmem type");
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if (!segment)
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return 0;
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Header* header;
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char *frontSentinel;
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char *data;
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char *backSentinel;
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GetSections(segment, &header, &frontSentinel, &data, &backSentinel);
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// initialize the segment with Shmem-internal information
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// NB: this can't be a static assert because technically pageSize
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// isn't known at compile time, event though in practice it's always
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// going to be 4KiB
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NS_ABORT_IF_FALSE(sizeof(Header) <= pageSize,
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"Shmem::Header has gotten too big");
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memcpy(header->mMagic, sMagic, sizeof(sMagic));
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header->mSize = static_cast<uint32_t>(aNBytes);
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header->mUnsafe = aUnsafe;
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if (aProtect)
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Protect(segment);
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return segment;
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}
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// static
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Shmem::SharedMemory*
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Shmem::OpenExisting(IHadBetterBeIPDLCodeCallingThis_OtherwiseIAmADoodyhead,
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const IPC::Message& aDescriptor,
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id_t* aId,
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bool aProtect)
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{
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if (SHMEM_CREATED_MESSAGE_TYPE != aDescriptor.type())
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NS_RUNTIMEABORT("expected 'shmem created' message");
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void* iter = 0;
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SharedMemory::SharedMemoryType type;
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size_t size;
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if (!ShmemCreated::ReadInfo(&aDescriptor, &iter, aId, &size, &type))
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return 0;
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SharedMemory* segment = 0;
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size_t pageSize = SharedMemory::SystemPageSize();
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// |2*pageSize| is for the front and back sentinels
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size_t segmentSize = SharedMemory::PageAlignedSize(size + 2*pageSize);
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if (SharedMemory::TYPE_BASIC == type) {
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SharedMemoryBasic::Handle handle;
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if (!ShmemCreated::ReadHandle(&aDescriptor, &iter, &handle))
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return 0;
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if (!SharedMemoryBasic::IsHandleValid(handle))
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NS_RUNTIMEABORT("trying to open invalid handle");
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segment = CreateSegment(segmentSize, handle);
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}
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#ifdef MOZ_HAVE_SHAREDMEMORYSYSV
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else if (SharedMemory::TYPE_SYSV == type) {
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SharedMemorySysV::Handle handle;
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if (!ShmemCreated::ReadHandle(&aDescriptor, &iter, &handle))
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return 0;
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if (!SharedMemorySysV::IsHandleValid(handle))
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NS_RUNTIMEABORT("trying to open invalid handle");
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segment = CreateSegment(segmentSize, handle);
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}
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#endif
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else {
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NS_RUNTIMEABORT("unknown shmem type");
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}
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if (!segment)
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return 0;
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// The caller of this function may not know whether the segment is
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// unsafe or not
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Header* header = GetHeader(segment);
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if (!header->mUnsafe && aProtect)
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Protect(segment);
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return segment;
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}
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// static
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void
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Shmem::Dealloc(IHadBetterBeIPDLCodeCallingThis_OtherwiseIAmADoodyhead,
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SharedMemory* aSegment)
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{
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if (!aSegment)
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return;
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size_t pageSize = SharedMemory::SystemPageSize();
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Header* header;
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char *frontSentinel;
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char *data;
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char *backSentinel;
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GetSections(aSegment, &header, &frontSentinel, &data, &backSentinel);
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aSegment->Protect(frontSentinel, pageSize, RightsWrite | RightsRead);
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memset(header->mMagic, 0, sizeof(sMagic));
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header->mSize = 0;
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header->mUnsafe = false; // make it "safe" so as to catch errors
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DestroySegment(aSegment);
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}
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#else // !defined(DEBUG)
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// static
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Shmem::SharedMemory*
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Shmem::Alloc(IHadBetterBeIPDLCodeCallingThis_OtherwiseIAmADoodyhead,
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size_t aNBytes,
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SharedMemoryType aType,
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bool /*unused*/,
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bool /*unused*/)
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{
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SharedMemory *segment = nullptr;
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if (aType == SharedMemory::TYPE_BASIC)
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segment = CreateSegment(SharedMemory::PageAlignedSize(aNBytes + sizeof(uint32_t)),
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SharedMemoryBasic::NULLHandle());
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#ifdef MOZ_HAVE_SHAREDMEMORYSYSV
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else if (aType == SharedMemory::TYPE_SYSV)
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segment = CreateSegment(SharedMemory::PageAlignedSize(aNBytes + sizeof(uint32_t)),
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SharedMemorySysV::NULLHandle());
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#endif
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else
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// Unhandled!!
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NS_ABORT();
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if (!segment)
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return 0;
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*PtrToSize(segment) = static_cast<uint32_t>(aNBytes);
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return segment;
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}
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// static
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Shmem::SharedMemory*
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Shmem::OpenExisting(IHadBetterBeIPDLCodeCallingThis_OtherwiseIAmADoodyhead,
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const IPC::Message& aDescriptor,
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id_t* aId,
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bool /*unused*/)
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{
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if (SHMEM_CREATED_MESSAGE_TYPE != aDescriptor.type())
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NS_RUNTIMEABORT("expected 'shmem created' message");
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SharedMemory::SharedMemoryType type;
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void* iter = 0;
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size_t size;
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if (!ShmemCreated::ReadInfo(&aDescriptor, &iter, aId, &size, &type))
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return 0;
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SharedMemory* segment = 0;
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size_t segmentSize = SharedMemory::PageAlignedSize(size + sizeof(uint32_t));
|
|
|
|
if (SharedMemory::TYPE_BASIC == type) {
|
|
SharedMemoryBasic::Handle handle;
|
|
if (!ShmemCreated::ReadHandle(&aDescriptor, &iter, &handle))
|
|
return 0;
|
|
|
|
if (!SharedMemoryBasic::IsHandleValid(handle))
|
|
NS_RUNTIMEABORT("trying to open invalid handle");
|
|
|
|
segment = CreateSegment(segmentSize, handle);
|
|
}
|
|
#ifdef MOZ_HAVE_SHAREDMEMORYSYSV
|
|
else if (SharedMemory::TYPE_SYSV == type) {
|
|
SharedMemorySysV::Handle handle;
|
|
if (!ShmemCreated::ReadHandle(&aDescriptor, &iter, &handle))
|
|
return 0;
|
|
|
|
if (!SharedMemorySysV::IsHandleValid(handle))
|
|
NS_RUNTIMEABORT("trying to open invalid handle");
|
|
segment = CreateSegment(segmentSize, handle);
|
|
}
|
|
#endif
|
|
else {
|
|
NS_RUNTIMEABORT("unknown shmem type");
|
|
}
|
|
|
|
if (!segment)
|
|
return 0;
|
|
|
|
// this is the only validity check done OPT builds
|
|
if (size != static_cast<size_t>(*PtrToSize(segment)))
|
|
NS_RUNTIMEABORT("Alloc() segment size disagrees with OpenExisting()'s");
|
|
|
|
return segment;
|
|
}
|
|
|
|
// static
|
|
void
|
|
Shmem::Dealloc(IHadBetterBeIPDLCodeCallingThis_OtherwiseIAmADoodyhead,
|
|
SharedMemory* aSegment)
|
|
{
|
|
DestroySegment(aSegment);
|
|
}
|
|
|
|
#endif // if defined(DEBUG)
|
|
|
|
int
|
|
Shmem::GetSysVID() const
|
|
{
|
|
#ifdef MOZ_HAVE_SHAREDMEMORYSYSV
|
|
AssertInvariants();
|
|
|
|
if (mSegment->Type() != SharedMemory::TYPE_SYSV)
|
|
NS_RUNTIMEABORT("Can't call GetSysVID() on a non-SysV Shmem!");
|
|
|
|
SharedMemorySysV* seg = static_cast<SharedMemorySysV*>(mSegment);
|
|
return seg->GetHandle();
|
|
#else
|
|
NS_RUNTIMEABORT("Can't call GetSysVID() with no support for SysV shared memory!");
|
|
return -1; // not reached
|
|
#endif
|
|
}
|
|
|
|
IPC::Message*
|
|
Shmem::ShareTo(IHadBetterBeIPDLCodeCallingThis_OtherwiseIAmADoodyhead,
|
|
base::ProcessHandle aProcess,
|
|
int32_t routingId)
|
|
{
|
|
AssertInvariants();
|
|
|
|
if (SharedMemory::TYPE_BASIC == mSegment->Type()) {
|
|
SharedMemoryBasic* seg = static_cast<SharedMemoryBasic*>(mSegment);
|
|
SharedMemoryBasic::Handle handle;
|
|
if (!seg->ShareToProcess(aProcess, &handle))
|
|
return 0;
|
|
|
|
return new ShmemCreated(routingId, mId, mSize, handle);
|
|
}
|
|
#ifdef MOZ_HAVE_SHAREDMEMORYSYSV
|
|
else if (SharedMemory::TYPE_SYSV == mSegment->Type()) {
|
|
SharedMemorySysV* seg = static_cast<SharedMemorySysV*>(mSegment);
|
|
return new ShmemCreated(routingId, mId, mSize, seg->GetHandle());
|
|
}
|
|
#endif
|
|
else {
|
|
NS_RUNTIMEABORT("unknown shmem type (here?!)");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
IPC::Message*
|
|
Shmem::UnshareFrom(IHadBetterBeIPDLCodeCallingThis_OtherwiseIAmADoodyhead,
|
|
base::ProcessHandle aProcess,
|
|
int32_t routingId)
|
|
{
|
|
AssertInvariants();
|
|
return new ShmemDestroyed(routingId, mId);
|
|
}
|
|
|
|
} // namespace ipc
|
|
} // namespace mozilla
|