Description: syscall SysExecve 执行漏洞修复

IssueNo: https://gitee.com/openharmony/kernel_liteos_a/issues/IALXZ5
Feature Or Bugfix: Bugfix
Binary Source: No
Signed-off-by: hw_llm <liu.limin@huawei.com>

syscall/fs_syscall.c

@@ -641,6 +641,9 @@ OUT:
 #ifdef LOSCFG_KERNEL_DYNLOAD
 int SysExecve(const char *fileName, char *const *argv, char *const *envp)
 {
+    if (!LOS_IsUserAddress((vaddr_t)(UINTPTR)fileName)) {
+        return -EFAULT;
+    }
     return LOS_DoExecveFile(fileName, argv, envp);
 }
 #endif