1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdint.h>
#include <sys/types.h>
#include <binder/PermissionCache.h>
#include <binder/IPCThreadState.h>
#include <private/android_filesystem_config.h>
#include "Client.h"
#include "Layer.h"
#include "SurfaceFlinger.h"
namespace android {
// ---------------------------------------------------------------------------
const String16 sAccessSurfaceFlinger("android.permission.ACCESS_SURFACE_FLINGER");
// ---------------------------------------------------------------------------
Client::Client(const sp<SurfaceFlinger>& flinger)
: Client(flinger, nullptr)
{
}
Client::Client(const sp<SurfaceFlinger>& flinger, const sp<Layer>& parentLayer)
: mFlinger(flinger),
mParentLayer(parentLayer)
{
}
Client::~Client()
{
// We need to post a message to remove our remaining layers rather than
// do so directly by acquiring the SurfaceFlinger lock. If we were to
// attempt to directly call the lock it becomes effectively impossible
// to use sp<Client> while holding the SF lock as descoping it could
// then trigger a dead-lock.
const size_t count = mLayers.size();
for (size_t i=0 ; i<count ; i++) {
sp<Layer> l = mLayers.valueAt(i).promote();
if (l == nullptr) {
continue;
}
mFlinger->postMessageAsync(new LambdaMessage([flinger = mFlinger, l]() {
flinger->removeLayer(l);
}));
}
}
void Client::updateParent(const sp<Layer>& parentLayer) {
Mutex::Autolock _l(mLock);
// If we didn't ever have a parent, then we must instead be
// relying on permissions and we never need a parent.
if (mParentLayer != nullptr) {
mParentLayer = parentLayer;
}
}
sp<Layer> Client::getParentLayer(bool* outParentDied) const {
Mutex::Autolock _l(mLock);
sp<Layer> parent = mParentLayer.promote();
if (outParentDied != nullptr) {
*outParentDied = (mParentLayer != nullptr && parent == nullptr);
}
return parent;
}
status_t Client::initCheck() const {
return NO_ERROR;
}
void Client::attachLayer(const sp<IBinder>& handle, const sp<Layer>& layer)
{
Mutex::Autolock _l(mLock);
mLayers.add(handle, layer);
}
void Client::detachLayer(const Layer* layer)
{
Mutex::Autolock _l(mLock);
// we do a linear search here, because this doesn't happen often
const size_t count = mLayers.size();
for (size_t i=0 ; i<count ; i++) {
if (mLayers.valueAt(i) == layer) {
mLayers.removeItemsAt(i, 1);
break;
}
}
}
sp<Layer> Client::getLayerUser(const sp<IBinder>& handle) const
{
Mutex::Autolock _l(mLock);
sp<Layer> lbc;
wp<Layer> layer(mLayers.valueFor(handle));
if (layer != 0) {
lbc = layer.promote();
ALOGE_IF(lbc==0, "getLayerUser(name=%p) is dead", handle.get());
}
return lbc;
}
status_t Client::onTransact(
uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
{
// these must be checked
IPCThreadState* ipc = IPCThreadState::self();
const int pid = ipc->getCallingPid();
const int uid = ipc->getCallingUid();
const int self_pid = getpid();
// If we are called from another non root process without the GRAPHICS, SYSTEM, or ROOT
// uid we require the sAccessSurfaceFlinger permission.
// We grant an exception in the case that the Client has a "parent layer", as its
// effects will be scoped to that layer.
if (CC_UNLIKELY(pid != self_pid && uid != AID_GRAPHICS && uid != AID_SYSTEM && uid != 0)
&& (getParentLayer() == nullptr)) {
// we're called from a different process, do the real check
if (!PermissionCache::checkCallingPermission(sAccessSurfaceFlinger))
{
ALOGE("Permission Denial: "
"can't openGlobalTransaction pid=%d, uid<=%d", pid, uid);
return PERMISSION_DENIED;
}
}
return BnSurfaceComposerClient::onTransact(code, data, reply, flags);
}
status_t Client::createSurface(
const String8& name,
uint32_t w, uint32_t h, PixelFormat format, uint32_t flags,
const sp<IBinder>& parentHandle, int32_t windowType, int32_t ownerUid,
sp<IBinder>* handle,
sp<IGraphicBufferProducer>* gbp)
{
sp<Layer> parent = nullptr;
if (parentHandle != nullptr) {
auto layerHandle = reinterpret_cast<Layer::Handle*>(parentHandle.get());
parent = layerHandle->owner.promote();
if (parent == nullptr) {
return NAME_NOT_FOUND;
}
}
if (parent == nullptr) {
bool parentDied;
parent = getParentLayer(&parentDied);
// If we had a parent, but it died, we've lost all
// our capabilities.
if (parentDied) {
return NAME_NOT_FOUND;
}
}
return mFlinger->createLayer(name, this, w, h, format, flags, windowType,
ownerUid, handle, gbp, &parent);
}
status_t Client::destroySurface(const sp<IBinder>& handle) {
return mFlinger->onLayerRemoved(this, handle);
}
status_t Client::clearLayerFrameStats(const sp<IBinder>& handle) const {
sp<Layer> layer = getLayerUser(handle);
if (layer == nullptr) {
return NAME_NOT_FOUND;
}
layer->clearFrameStats();
return NO_ERROR;
}
status_t Client::getLayerFrameStats(const sp<IBinder>& handle, FrameStats* outStats) const {
sp<Layer> layer = getLayerUser(handle);
if (layer == nullptr) {
return NAME_NOT_FOUND;
}
layer->getFrameStats(outStats);
return NO_ERROR;
}
// ---------------------------------------------------------------------------
}; // namespace android
|