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# HG changeset patch
# User Bob Owen <bobowencode@gmail.com>
# Date 1632737723 -3600
# Mon Sep 27 11:15:23 2021 +0100
# Node ID 096696bc1648dbacdfab881c4ed8fe770ebe58b1
# Parent 254b1fc8768f67d208af199135276abae9aabc0c
This adds a new cross call using the chromium shared memory IPC to proxy use of
the Uniscribe line breaker, because it cannot be used in the content process
with win32k lockdown enabled.
If the text being processed is too long to fit into the IPC params then it is
processed in chunks.
This change implements an INPTR_TYPE in the sandbox, which appears to have
been removed at some point.
It also fixes a bug in OpcodeFactory::MakeOpAction, so that a null param is
passed and we can use an empty parameter set.
New files are in chromium-shim as these are most likely to require changes and
this means we will not have to update the main chromium patch.
diff --git a/sandbox/win/src/crosscall_client.h b/sandbox/win/src/crosscall_client.h
--- a/sandbox/win/src/crosscall_client.h
+++ b/sandbox/win/src/crosscall_client.h
@@ -39,20 +39,16 @@
// interpretation of the answer is private to client and server.
//
// The return value is ALL_OK if the IPC was delivered to the server, other
// return codes indicate that the IPC transport failed to deliver it.
namespace sandbox {
enum class IpcTag;
-// this is the assumed channel size. This can be overridden in a given
-// IPC implementation.
-const uint32_t kIPCChannelSize = 1024;
-
// The copy helper uses templates to deduce the appropriate copy function to
// copy the input parameters in the buffer that is going to be send across the
// IPC. These template facility can be made more sophisticated as need arises.
// The default copy helper. It catches the general case where no other
// specialized template matches better. We set the type to UINT32_TYPE, so this
// only works with objects whose size is 32 bits.
template <typename T>
@@ -207,16 +203,42 @@ class CopyHelper<const wchar_t[n]> : pub
// parameters.
class InOutCountedBuffer : public CountedBuffer {
public:
InOutCountedBuffer(void* buffer, uint32_t size)
: CountedBuffer(buffer, size) {}
};
// This copy helper template specialization catches the cases where the
+// parameter is a an input buffer.
+template <>
+class CopyHelper<CountedBuffer> {
+ public:
+ CopyHelper(const CountedBuffer t) : t_(t) {}
+
+ // Returns the pointer to the start of the string.
+ const void* GetStart() const { return t_.Buffer(); }
+
+ // Update not required so just return true;
+ bool Update(void* buffer) { return true; }
+
+ // Returns the size of the string in bytes. We define a nullptr string to
+ // be of zero length.
+ uint32_t GetSize() const { return t_.Size(); }
+
+ // Returns true if the current type is used as an In or InOut parameter.
+ bool IsInOut() { return false; }
+
+ ArgType GetType() { return INPTR_TYPE; }
+
+ private:
+ const CountedBuffer t_;
+};
+
+// This copy helper template specialization catches the cases where the
// parameter is a an input/output buffer.
template <>
class CopyHelper<InOutCountedBuffer> {
public:
CopyHelper(const InOutCountedBuffer t) : t_(t) {}
// Returns the pointer to the start of the string.
const void* GetStart() const { return t_.Buffer(); }
diff --git a/sandbox/win/src/crosscall_params.h b/sandbox/win/src/crosscall_params.h
--- a/sandbox/win/src/crosscall_params.h
+++ b/sandbox/win/src/crosscall_params.h
@@ -41,16 +41,20 @@
// them are not supported.
//
// Another limitation of CrossCall is that the return value and output
// parameters can only be uint32_t integers. Returning complex structures or
// strings is not supported.
namespace sandbox {
+// this is the assumed channel size. This can be overridden in a given
+// IPC implementation.
+const uint32_t kIPCChannelSize = 1024;
+
// This is the list of all imported symbols from ntdll.dll.
SANDBOX_INTERCEPT NtExports g_nt;
namespace {
// Increases |value| until there is no need for padding given an int64_t
// alignment. Returns the increased value.
inline uint32_t Align(uint32_t value) {
@@ -216,16 +220,21 @@ class ActualCallParams : public CrossCal
// Testing-only constructor. Allows setting the |number_params| to a
// wrong value.
ActualCallParams(IpcTag tag, uint32_t number_params)
: CrossCallParams(tag, number_params) {
param_info_[0].offset_ =
static_cast<uint32_t>(parameters_ - reinterpret_cast<char*>(this));
}
+ static constexpr size_t MaxParamsSize() {
+ return sizeof(
+ ActualCallParams<NUMBER_PARAMS, kIPCChannelSize>::parameters_);
+ }
+
// Testing-only method. Allows setting the apparent size to a wrong value.
// returns the previous size.
uint32_t OverrideSize(uint32_t new_size) {
uint32_t previous_size = param_info_[NUMBER_PARAMS].offset_;
param_info_[NUMBER_PARAMS].offset_ = new_size;
return previous_size;
}
diff --git a/sandbox/win/src/crosscall_server.cc b/sandbox/win/src/crosscall_server.cc
--- a/sandbox/win/src/crosscall_server.cc
+++ b/sandbox/win/src/crosscall_server.cc
@@ -301,17 +301,17 @@ bool CrossCallParamsEx::GetParameterStr(
bool CrossCallParamsEx::GetParameterPtr(uint32_t index,
uint32_t expected_size,
void** pointer) {
uint32_t size = 0;
ArgType type;
void* start = GetRawParameter(index, &size, &type);
- if ((size != expected_size) || (INOUTPTR_TYPE != type))
+ if ((size != expected_size) || (INOUTPTR_TYPE != type && INPTR_TYPE != type))
return false;
if (!start)
return false;
*pointer = start;
return true;
}
diff --git a/sandbox/win/src/ipc_args.cc b/sandbox/win/src/ipc_args.cc
--- a/sandbox/win/src/ipc_args.cc
+++ b/sandbox/win/src/ipc_args.cc
@@ -15,16 +15,17 @@ namespace sandbox {
void ReleaseArgs(const IPCParams* ipc_params, void* args[kMaxIpcParams]) {
for (size_t i = 0; i < kMaxIpcParams; i++) {
switch (ipc_params->args[i]) {
case WCHAR_TYPE: {
delete reinterpret_cast<std::wstring*>(args[i]);
args[i] = nullptr;
break;
}
+ case INPTR_TYPE:
case INOUTPTR_TYPE: {
delete reinterpret_cast<CountedBuffer*>(args[i]);
args[i] = nullptr;
break;
}
default:
break;
}
@@ -69,16 +70,17 @@ bool GetArgs(CrossCallParamsEx* params,
void* data;
if (!params->GetParameterVoidPtr(i, &data)) {
ReleaseArgs(ipc_params, args);
return false;
}
args[i] = data;
break;
}
+ case INPTR_TYPE:
case INOUTPTR_TYPE: {
if (!args[i]) {
ReleaseArgs(ipc_params, args);
return false;
}
CountedBuffer* buffer = new CountedBuffer(args[i], size);
args[i] = buffer;
break;
diff --git a/sandbox/win/src/ipc_tags.h b/sandbox/win/src/ipc_tags.h
--- a/sandbox/win/src/ipc_tags.h
+++ b/sandbox/win/src/ipc_tags.h
@@ -41,16 +41,17 @@ enum class IpcTag {
GDI_GETCERTIFICATESIZE,
GDI_DESTROYOPMPROTECTEDOUTPUT,
GDI_CONFIGUREOPMPROTECTEDOUTPUT,
GDI_GETOPMINFORMATION,
GDI_GETOPMRANDOMNUMBER,
GDI_GETSUGGESTEDOPMPROTECTEDOUTPUTARRAYSIZE,
GDI_SETOPMSIGNINGKEYANDSEQUENCENUMBERS,
NTCREATESECTION,
+ GETCOMPLEXLINEBREAKS,
LAST
};
constexpr size_t kMaxServiceCount = 64;
constexpr size_t kMaxIpcTag = static_cast<size_t>(IpcTag::LAST);
static_assert(kMaxIpcTag <= kMaxServiceCount, "kMaxServiceCount is too low");
} // namespace sandbox
diff --git a/sandbox/win/src/policy_engine_opcodes.cc b/sandbox/win/src/policy_engine_opcodes.cc
--- a/sandbox/win/src/policy_engine_opcodes.cc
+++ b/sandbox/win/src/policy_engine_opcodes.cc
@@ -78,17 +78,17 @@ EvalResult OpcodeEval<OP_ALWAYS_TRUE>(Po
}
//////////////////////////////////////////////////////////////////////////////
// Opcode OpAction:
// Does not require input parameter.
// Argument 0 contains the actual action to return.
PolicyOpcode* OpcodeFactory::MakeOpAction(EvalResult action, uint32_t options) {
- PolicyOpcode* opcode = MakeBase(OP_ACTION, options, 0);
+ PolicyOpcode* opcode = MakeBase(OP_ACTION, options, -1);
if (!opcode)
return nullptr;
opcode->SetArgument(0, action);
return opcode;
}
template <>
EvalResult OpcodeEval<OP_ACTION>(PolicyOpcode* opcode,
diff --git a/sandbox/win/src/policy_params.h b/sandbox/win/src/policy_params.h
--- a/sandbox/win/src/policy_params.h
+++ b/sandbox/win/src/policy_params.h
@@ -56,11 +56,15 @@ POLPARAMS_BEGIN(OpenKey)
POLPARAMS_END(OpenKey)
// Policy parameter for name-based policies.
POLPARAMS_BEGIN(HandleTarget)
POLPARAM(NAME)
POLPARAM(TARGET)
POLPARAMS_END(HandleTarget)
+// Policy parameters where no parameter based checks are done.
+POLPARAMS_BEGIN(EmptyParams)
+POLPARAMS_END(EmptyParams)
+
} // namespace sandbox
#endif // SANDBOX_SRC_POLICY_PARAMS_H__
diff --git a/sandbox/win/src/sandbox.h b/sandbox/win/src/sandbox.h
--- a/sandbox/win/src/sandbox.h
+++ b/sandbox/win/src/sandbox.h
@@ -154,16 +154,19 @@ class TargetServices {
// fails the current process could be terminated immediately.
virtual void LowerToken() = 0;
// Returns the ProcessState object. Through that object it's possible to have
// information about the current state of the process, such as whether
// LowerToken has been called or not.
virtual ProcessState* GetState() = 0;
+ virtual ResultCode GetComplexLineBreaks(const WCHAR* text, uint32_t length,
+ uint8_t* break_before) = 0;
+
protected:
~TargetServices() {}
};
class PolicyInfo {
public:
// Returns a JSON representation of the policy snapshot.
// This pointer has the same lifetime as this PolicyInfo object.
diff --git a/sandbox/win/src/sandbox_policy.h b/sandbox/win/src/sandbox_policy.h
--- a/sandbox/win/src/sandbox_policy.h
+++ b/sandbox/win/src/sandbox_policy.h
@@ -27,17 +27,18 @@ class TargetPolicy {
// process_thread_dispatcher.cc for more details.
enum SubSystem {
SUBSYS_FILES, // Creation and opening of files and pipes.
SUBSYS_NAMED_PIPES, // Creation of named pipes.
SUBSYS_PROCESS, // Creation of child processes.
SUBSYS_REGISTRY, // Creation and opening of registry keys.
SUBSYS_SYNC, // Creation of named sync objects.
SUBSYS_WIN32K_LOCKDOWN, // Win32K Lockdown related policy.
- SUBSYS_SIGNED_BINARY // Signed binary policy.
+ SUBSYS_SIGNED_BINARY, // Signed binary policy.
+ SUBSYS_LINE_BREAK // Complex line break policy.
};
// Allowable semantics when a rule is matched.
enum Semantics {
FILES_ALLOW_ANY, // Allows open or create for any kind of access that
// the file system supports.
FILES_ALLOW_READONLY, // Allows open or create with read access only.
FILES_ALLOW_QUERY, // Allows access to query the attributes of a file.
@@ -60,17 +61,18 @@ class TargetPolicy {
REG_ALLOW_READONLY, // Allows readonly access to a registry key.
REG_ALLOW_ANY, // Allows read and write access to a registry key.
FAKE_USER_GDI_INIT, // Fakes user32 and gdi32 initialization. This can
// be used to allow the DLLs to load and initialize
// even if the process cannot access that subsystem.
IMPLEMENT_OPM_APIS, // Implements FAKE_USER_GDI_INIT and also exposes
// IPC calls to handle Output Protection Manager
// APIs.
- SIGNED_ALLOW_LOAD // Allows loading the module when CIG is enabled.
+ SIGNED_ALLOW_LOAD, // Allows loading the module when CIG is enabled.
+ LINE_BREAK_ALLOW // Allow complex line break brokering.
};
// Increments the reference count of this object. The reference count must
// be incremented if this interface is given to another component.
virtual void AddRef() = 0;
// Decrements the reference count of this object. When the reference count
// is zero the object is automatically destroyed.
diff --git a/sandbox/win/src/sandbox_policy_base.cc b/sandbox/win/src/sandbox_policy_base.cc
--- a/sandbox/win/src/sandbox_policy_base.cc
+++ b/sandbox/win/src/sandbox_policy_base.cc
@@ -15,16 +15,17 @@
#include "base/stl_util.h"
#include "base/strings/stringprintf.h"
#include "base/win/win_util.h"
#include "base/win/windows_version.h"
#include "sandbox/win/src/acl.h"
#include "sandbox/win/src/filesystem_policy.h"
#include "sandbox/win/src/interception.h"
#include "sandbox/win/src/job.h"
+#include "sandbox/win/src/line_break_policy.h"
#include "sandbox/win/src/named_pipe_policy.h"
#include "sandbox/win/src/policy_broker.h"
#include "sandbox/win/src/policy_engine_processor.h"
#include "sandbox/win/src/policy_low_level.h"
#include "sandbox/win/src/process_mitigations.h"
#include "sandbox/win/src/process_mitigations_win32k_policy.h"
#include "sandbox/win/src/process_thread_policy.h"
#include "sandbox/win/src/registry_policy.h"
@@ -809,16 +810,23 @@ ResultCode PolicyBase::AddRuleInternal(S
"policy rules.";
if (!SignedPolicy::GenerateRules(pattern, semantics, policy_maker_)) {
NOTREACHED();
return SBOX_ERROR_BAD_PARAMS;
}
}
break;
}
+ case SUBSYS_LINE_BREAK: {
+ if (!LineBreakPolicy::GenerateRules(pattern, semantics, policy_maker_)) {
+ NOTREACHED();
+ return SBOX_ERROR_BAD_PARAMS;
+ }
+ break;
+ }
default: { return SBOX_ERROR_UNSUPPORTED; }
}
return SBOX_ALL_OK;
}
} // namespace sandbox
diff --git a/sandbox/win/src/target_services.cc b/sandbox/win/src/target_services.cc
--- a/sandbox/win/src/target_services.cc
+++ b/sandbox/win/src/target_services.cc
@@ -9,16 +9,17 @@
#include <process.h>
#include <stdint.h>
#include "base/win/windows_version.h"
#include "sandbox/win/src/crosscall_client.h"
#include "sandbox/win/src/handle_closer_agent.h"
#include "sandbox/win/src/heap_helper.h"
+#include "sandbox/win/src/line_break_interception.h"
#include "sandbox/win/src/ipc_tags.h"
#include "sandbox/win/src/process_mitigations.h"
#include "sandbox/win/src/restricted_token_utils.h"
#include "sandbox/win/src/sandbox.h"
#include "sandbox/win/src/sandbox_nt_util.h"
#include "sandbox/win/src/sandbox_types.h"
#include "sandbox/win/src/sharedmem_ipc_client.h"
@@ -240,9 +241,15 @@ void ProcessState::SetRevertedToSelf() {
if (process_state_ < ProcessStateInternal::REVERTED_TO_SELF)
process_state_ = ProcessStateInternal::REVERTED_TO_SELF;
}
void ProcessState::SetCsrssConnected(bool csrss_connected) {
csrss_connected_ = csrss_connected;
}
+ResultCode TargetServicesBase::GetComplexLineBreaks(const WCHAR* text,
+ uint32_t length,
+ uint8_t* break_before) {
+ return sandbox::GetComplexLineBreaksProxy(text, length, break_before);
+}
+
} // namespace sandbox
diff --git a/sandbox/win/src/target_services.h b/sandbox/win/src/target_services.h
--- a/sandbox/win/src/target_services.h
+++ b/sandbox/win/src/target_services.h
@@ -40,16 +40,18 @@ class TargetServicesBase : public Target
class TargetServicesBase : public TargetServices {
public:
TargetServicesBase();
// Public interface of TargetServices.
ResultCode Init() override;
void LowerToken() override;
ProcessState* GetState() override;
+ ResultCode GetComplexLineBreaks(const WCHAR* text, uint32_t length,
+ uint8_t* break_before) final;
// Factory method.
static TargetServicesBase* GetInstance();
// Sends a simple IPC Message that has a well-known answer. Returns true
// if the IPC was successful and false otherwise. There are 2 versions of
// this test: 1 and 2. The first one send a simple message while the
// second one send a message with an in/out param.
diff --git a/sandbox/win/src/top_level_dispatcher.cc b/sandbox/win/src/top_level_dispatcher.cc
--- a/sandbox/win/src/top_level_dispatcher.cc
+++ b/sandbox/win/src/top_level_dispatcher.cc
@@ -8,16 +8,17 @@
#include <string.h>
#include "base/logging.h"
#include "sandbox/win/src/crosscall_server.h"
#include "sandbox/win/src/filesystem_dispatcher.h"
#include "sandbox/win/src/interception.h"
#include "sandbox/win/src/internal_types.h"
#include "sandbox/win/src/ipc_tags.h"
+#include "sandbox/win/src/line_break_dispatcher.h"
#include "sandbox/win/src/named_pipe_dispatcher.h"
#include "sandbox/win/src/process_mitigations_win32k_dispatcher.h"
#include "sandbox/win/src/process_thread_dispatcher.h"
#include "sandbox/win/src/registry_dispatcher.h"
#include "sandbox/win/src/sandbox_policy_base.h"
#include "sandbox/win/src/signed_dispatcher.h"
#include "sandbox/win/src/sync_dispatcher.h"
@@ -90,16 +91,20 @@ TopLevelDispatcher::TopLevelDispatcher(P
IpcTag::GDI_GETSUGGESTEDOPMPROTECTEDOUTPUTARRAYSIZE)] = dispatcher;
ipc_targets_[static_cast<size_t>(
IpcTag::GDI_SETOPMSIGNINGKEYANDSEQUENCENUMBERS)] = dispatcher;
process_mitigations_win32k_dispatcher_.reset(dispatcher);
dispatcher = new SignedDispatcher(policy_);
ipc_targets_[static_cast<size_t>(IpcTag::NTCREATESECTION)] = dispatcher;
signed_dispatcher_.reset(dispatcher);
+
+ dispatcher = new LineBreakDispatcher(policy_);
+ ipc_targets_[static_cast<size_t>(IpcTag::GETCOMPLEXLINEBREAKS)] = dispatcher;
+ line_break_dispatcher_.reset(dispatcher);
}
TopLevelDispatcher::~TopLevelDispatcher() {}
// When an IPC is ready in any of the targets we get called. We manage an array
// of IPC dispatchers which are keyed on the IPC tag so we normally delegate
// to the appropriate dispatcher unless we can handle the IPC call ourselves.
Dispatcher* TopLevelDispatcher::OnMessageReady(IPCParams* ipc,
diff --git a/sandbox/win/src/top_level_dispatcher.h b/sandbox/win/src/top_level_dispatcher.h
--- a/sandbox/win/src/top_level_dispatcher.h
+++ b/sandbox/win/src/top_level_dispatcher.h
@@ -38,16 +38,17 @@ class TopLevelDispatcher : public Dispat
std::unique_ptr<Dispatcher> filesystem_dispatcher_;
std::unique_ptr<Dispatcher> named_pipe_dispatcher_;
std::unique_ptr<Dispatcher> thread_process_dispatcher_;
std::unique_ptr<Dispatcher> sync_dispatcher_;
std::unique_ptr<Dispatcher> registry_dispatcher_;
std::unique_ptr<Dispatcher> handle_dispatcher_;
std::unique_ptr<Dispatcher> process_mitigations_win32k_dispatcher_;
std::unique_ptr<Dispatcher> signed_dispatcher_;
+ std::unique_ptr<Dispatcher> line_break_dispatcher_;
Dispatcher* ipc_targets_[kMaxIpcTag];
DISALLOW_COPY_AND_ASSIGN(TopLevelDispatcher);
};
} // namespace sandbox
#endif // SANDBOX_SRC_TOP_LEVEL_DISPATCHER_H__