Try to fix permission issues under linux

Author: mutouyun

src/libipc/platform/posix/shm_posix.cpp

@@ -68,7 +68,9 @@ id_t acquire(char const * name, std::size_t size, unsigned mode) {
         flag |= O_CREAT;
         break;
     }
-    int fd = ::shm_open(op_name.c_str(), flag, 0);
+    int fd = ::shm_open(op_name.c_str(), flag, S_IRUSR | S_IWUSR | 
+                                               S_IRGRP | S_IWGRP | 
+                                               S_IROTH | S_IWOTH);
     if (fd == -1) {
         ipc::error("fail shm_open[%d]: %s\n", errno, op_name.c_str());
         return nullptr;