Fix liboat_hook.so inaccessible in some device (#190)

User has reported `dex2oat` failure with SELinux log:

```
W dex2oat64: type=1400 audit(0.0:922): avc: denied { read } for path="/data/adb/modules/zygisk_lsposed/bin/liboat_hook64.so" dev="dm-58" ino=91204 scontext=u:r:dex2oat:s0 tcontext=u:object_r:adb_data_file:s0 tclass=file permissive=0
```

Hence, we now set the SELinux context of `liboat_hook.so` in Dex2OatService.

Moreover, by the pull-request #194, we have to move `putenv` out of the if block by testing.
Indeed, if we call `putenv` inside the if block, then it is no longer valid out of the block.

Author: JingMatrix

daemon/src/main/java/org/lsposed/lspd/service/Dex2OatService.java

@@ -50,6 +50,8 @@ public class Dex2OatService implements Runnable {
     private static final String TAG = "LSPosedDex2Oat";
     private static final String WRAPPER32 = "bin/dex2oat32";
     private static final String WRAPPER64 = "bin/dex2oat64";
+    private static final String HOOKER32 = "bin/liboat_hook32.so";
+    private static final String HOOKER64 = "bin/liboat_hook64.so";
 
     private final String[] dex2oatArray = new String[6];
     private final FileDescriptor[] fdArray = new FileDescriptor[6];
@@ -186,6 +188,8 @@ public void run() {
             SELinux.setFileContext(WRAPPER64, xposed_file);
             setSockCreateContext("u:r:installd:s0");
         }
+        SELinux.setFileContext(HOOKER32, xposed_file);
+        SELinux.setFileContext(HOOKER64, xposed_file);
         try (var server = new LocalServerSocket(sockPath)) {
             setSockCreateContext(null);
             while (true) {

dex2oat/src/main/cpp/dex2oat.c

@@ -117,6 +117,9 @@ int main(int argc, char **argv) {
     read_int(sock_fd);
     close(sock_fd);
 
+    if (hooker_fd == -1) {
+        PLOGE("failed to read liboat_hook.so");
+    }
     LOGD("sock: %s %d", sock.sun_path + 1, stock_fd);
 
     const char *new_argv[argc + 2];
@@ -136,6 +139,7 @@ int main(int argc, char **argv) {
     char env_str[STRING_BUFFER];
     snprintf(env_str, STRING_BUFFER, "LD_PRELOAD=/proc/%d/fd/%d", getpid(), hooker_fd);
     putenv(env_str);
+    LOGD("Set env %s", env_str);
 
     fexecve(stock_fd, (char **)new_argv, environ);