fix: 增强对LOS_ArchCopyToUser接口的安全防护

Close: #I61CLY

Signed-off-by: zhangdengyu <zhangdengyu2@huawei.com>
Change-Id: I0faf8e5849c24b108f290e483124f3edaf70ef50

kernel/base/vm/shm.c

@@ -604,7 +604,7 @@ INT32 ShmCtl(INT32 shmid, INT32 cmd, struct shmid_ds *buf)
 {
     struct shmIDSource *seg = NULL;
     INT32 ret = 0;
-    struct shm_info shmInfo;
+    struct shm_info shmInfo = { 0 };
     struct ipc_perm shm_perm;
 
     cmd = ((UINT32)cmd & ~IPC_64);