1 /*
2 * Copyright (c) 2021-2022 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include "appspawn_server.h"
17
18 #include <stdlib.h>
19 #include <errno.h>
20 #include <sys/stat.h>
21 #include <unistd.h>
22 #include <signal.h>
23 #undef _GNU_SOURCE
24 #define _GNU_SOURCE
25 #include <sched.h>
26 #include <time.h>
27 #ifdef SECURITY_COMPONENT_ENABLE
28 #include "sec_comp_enhance_kit_c.h"
29 #endif
30
31 #define DEFAULT_UMASK 0002
32 #define SANDBOX_STACK_SIZE (1024 * 1024 * 8)
33
DiffTime(struct timespec * startTime)34 long long DiffTime(struct timespec *startTime)
35 {
36 struct timespec tmEnd = {0};
37 clock_gettime(CLOCK_REALTIME, &tmEnd);
38 long long diff = (long long)((tmEnd.tv_sec - startTime->tv_sec) * 1000000); // 1000000 1000ms
39 if (tmEnd.tv_nsec > startTime->tv_nsec) {
40 diff += (tmEnd.tv_nsec - startTime->tv_nsec) / 1000; // 1000 ms
41 } else {
42 diff -= (startTime->tv_nsec - tmEnd.tv_nsec) / 1000; // 1000 ms
43 }
44 return diff;
45 }
46
NotifyResToParent(struct AppSpawnContent_ * content,AppSpawnClient * client,int result)47 static void NotifyResToParent(struct AppSpawnContent_ *content, AppSpawnClient *client, int result)
48 {
49 if (content->notifyResToParent != NULL) {
50 content->notifyResToParent(content, client, result);
51 }
52 }
53
ProcessExit(int code)54 static void ProcessExit(int code)
55 {
56 APPSPAWN_LOGI("App exit code: %{public}d", code);
57 #ifdef OHOS_LITE
58 _exit(0x7f); // 0x7f user exit
59 #else
60 #ifndef APPSPAWN_TEST
61 quick_exit(0);
62 #endif
63 #endif
64 }
65
66 #ifdef APPSPAWN_HELPER
67 __attribute__((visibility("default")))
68 _Noreturn
exit(int code)69 void exit(int code)
70 {
71 char *checkExit = getenv(APPSPAWN_CHECK_EXIT);
72 if (checkExit && atoi(checkExit) == getpid()) {
73 APPSPAWN_LOGF("Unexpected call: exit(%{public}d)", code);
74 abort();
75 }
76 // hook `exit` to `ProcessExit` to ensure app exit in a clean way
77 ProcessExit(code);
78 // should not come here
79 abort();
80 }
81 #endif
82
DoStartApp(struct AppSpawnContent_ * content,AppSpawnClient * client,char * longProcName,uint32_t longProcNameLen)83 int DoStartApp(struct AppSpawnContent_ *content, AppSpawnClient *client, char *longProcName, uint32_t longProcNameLen)
84 {
85 int32_t ret = 0;
86 APPSPAWN_LOGV("DoStartApp id %{public}d longProcNameLen %{public}u", client->id, longProcNameLen);
87 if (content->handleInternetPermission != NULL) {
88 content->handleInternetPermission(client);
89 }
90
91 if (content->setAppSandbox) {
92 ret = content->setAppSandbox(content, client);
93 APPSPAWN_CHECK(ret == 0, NotifyResToParent(content, client, ret);
94 return ret, "Failed to set app sandbox");
95 }
96
97 (void)umask(DEFAULT_UMASK);
98 if (content->setKeepCapabilities) {
99 ret = content->setKeepCapabilities(content, client);
100 APPSPAWN_CHECK(ret == 0, NotifyResToParent(content, client, ret);
101 return ret, "Failed to set KeepCapabilities");
102 }
103
104 if (content->setProcessName) {
105 ret = content->setProcessName(content, client, longProcName, longProcNameLen);
106 APPSPAWN_CHECK(ret == 0, NotifyResToParent(content, client, ret);
107 return ret, "Failed to set setProcessName");
108 }
109
110 if (content->setXpmRegion) {
111 ret = content->setXpmRegion(content);
112 APPSPAWN_CHECK(ret == 0, NotifyResToParent(content, client, ret);
113 return ret, "Failed to set setXpmRegion");
114 }
115
116 if (content->setUidGid) {
117 ret = content->setUidGid(content, client);
118 APPSPAWN_CHECK(ret == 0, NotifyResToParent(content, client, ret);
119 return ret, "Failed to setUidGid");
120 }
121
122 if (content->setFileDescriptors) {
123 ret = content->setFileDescriptors(content, client);
124 APPSPAWN_CHECK(ret == 0, NotifyResToParent(content, client, ret);
125 return ret, "Failed to setFileDescriptors");
126 }
127
128 if (content->setCapabilities) {
129 ret = content->setCapabilities(content, client);
130 APPSPAWN_CHECK(ret == 0, NotifyResToParent(content, client, ret);
131 return ret, "Failed to setCapabilities");
132 }
133
134 if (content->waitForDebugger) {
135 ret = content->waitForDebugger(client);
136 APPSPAWN_CHECK(ret == 0, NotifyResToParent(content, client, ret);
137 return ret, "Failed to waitForDebugger");
138 }
139
140 #ifdef SECURITY_COMPONENT_ENABLE
141 InitSecCompClientEnhance();
142 #endif
143
144 // notify success to father process and start app process
145 NotifyResToParent(content, client, 0);
146 return 0;
147 }
148
AppSpawnChild(void * arg)149 static int AppSpawnChild(void *arg)
150 {
151 APPSPAWN_CHECK(arg != NULL, return -1, "Invalid arg for appspawn child");
152 AppSandboxArg *sandbox = (AppSandboxArg *)arg;
153 struct AppSpawnContent_ *content = sandbox->content;
154 AppSpawnClient *client = sandbox->client;
155 int ret = -1;
156
157 #ifdef OHOS_DEBUG
158 struct timespec tmStart = {0};
159 clock_gettime(CLOCK_REALTIME, &tmStart);
160 #endif
161 // close socket id and signal for child
162 if (content->clearEnvironment != NULL) {
163 content->clearEnvironment(content, client);
164 }
165
166 if (content->setAppAccessToken != NULL) {
167 ret = content->setAppAccessToken(content, client);
168 if (ret != 0) {
169 APPSPAWN_LOGE("AppSpawnChild, set app token id failed");
170 return -1;
171 }
172 }
173
174 if ((content->getWrapBundleNameValue != NULL && content->getWrapBundleNameValue(content, client) == 0) ||
175 ((client->flags & APP_COLD_START) != 0)) {
176 // cold start fail, to start normal
177 if (content->coldStartApp != NULL && content->coldStartApp(content, client) == 0) {
178 return 0;
179 }
180 }
181 ret = DoStartApp(content, client, content->longProcName, content->longProcNameLen);
182 if (content->initDebugParams != NULL) {
183 content->initDebugParams(content, client);
184 }
185 #ifdef OHOS_DEBUG
186 long long diff = DiffTime(&tmStart);
187 APPSPAWN_LOGI("App timeused %{public}d %lld ns.", getpid(), diff);
188 #endif
189 if (ret == 0 && content->runChildProcessor != NULL) {
190 content->runChildProcessor(content, client);
191 }
192 return 0;
193 }
194
CloneAppSpawn(void * arg)195 static int CloneAppSpawn(void *arg)
196 {
197 int ret = AppSpawnChild(arg);
198 ProcessExit(ret);
199 return ret;
200 }
201
202 #ifndef APPSPAWN_TEST
AppSpawnFork(int (* childFunc)(void * arg),void * args)203 pid_t AppSpawnFork(int (*childFunc)(void *arg), void *args)
204 {
205 pid_t pid = fork();
206 if (pid == 0) {
207 ProcessExit(childFunc(args));
208 }
209 return pid;
210 }
211 #endif
212
AppSpawnProcessMsg(AppSandboxArg * sandbox,pid_t * childPid)213 int AppSpawnProcessMsg(AppSandboxArg *sandbox, pid_t *childPid)
214 {
215 APPSPAWN_CHECK(sandbox != NULL && sandbox->content != NULL, return -1, "Invalid content for appspawn");
216 APPSPAWN_CHECK(sandbox->client != NULL && childPid != NULL, return -1, "Invalid client for appspawn");
217 APPSPAWN_LOGI("AppSpawnProcessMsg id %{public}d 0x%{public}x", sandbox->client->id, sandbox->client->flags);
218
219 #ifndef OHOS_LITE
220 AppSpawnClient *client = sandbox->client;
221 if (client->cloneFlags & CLONE_NEWPID) {
222 APPSPAWN_CHECK(client->cloneFlags & CLONE_NEWNS, return -1, "clone flags error");
223 char *childStack = (char *)malloc(SANDBOX_STACK_SIZE);
224 APPSPAWN_CHECK(childStack != NULL, return -1, "malloc failed");
225 pid_t pid = clone(CloneAppSpawn,
226 childStack + SANDBOX_STACK_SIZE, client->cloneFlags | SIGCHLD, (void *)sandbox);
227 if (pid > 0) {
228 free(childStack);
229 *childPid = pid;
230 return 0;
231 }
232 client->cloneFlags &= ~CLONE_NEWPID;
233 free(childStack);
234 }
235 #endif
236 *childPid = AppSpawnFork(AppSpawnChild, (void *)sandbox);
237 APPSPAWN_CHECK(*childPid >= 0, return -errno, "fork child process error: %{public}d", -errno);
238 return 0;
239 }
240
241