WAMR application can access the whole File System at Zephyr

[banana-sun]

OS: Zephyr v3.7.1
WAMR brance: https://github.com/bytecodealliance/wasm-micro-runtime/tree/dev/zephyr_file_socket
Hardware: NUCLEO-H563ZI
Zephyr File System: lfs/test.txt
WAMR FS interaction folder: --dir=/lfs

There is a test.txt file at /lfs. Then in the WAMR application, if need to access test.txt file, it should be /test.txt instead of /lfs/test.txt. This is my understanding. I'm not sure if it's correct.

Runtime implement:

    const char * wasi_dir = "/lfs";

    /* load WASM module */
    wasm_module = wasm_runtime_load(wasm_file_buf, entry.size, error_buf, sizeof(error_buf));

    wasm_runtime_set_wasi_args_ex(wasm_module, &wasi_dir, 1, NULL, 0, NULL, 0, NULL, 0, 0, 1, 2);

    /* instantiate the module */
    wasm_module_inst =
              wasm_runtime_instantiate(wasm_module, CONFIG_APP_STACK_SIZE, CONFIG_APP_HEAP_SIZE, error_buf, sizeof(error_buf));
    wasm_application_execute_main(module_inst, app_argc, app_argv);

Application code:

#include <stdio.h>
#include <stdlib.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <dirent.h>

static int file_test(void)
{
    int     fd;
    uint8_t buf[32] = { 0 };

    fd = open("/lfs/test.txt", O_CREAT | O_RDWR);
    if (fd < 0)
    {
        printf("Error opening file [%d]\n", fd);
        printf("%s\r\n", strerror(errno));
        return fd;
    }
    printf("File opened successfully\n");

    uint32_t len = read(fd, buf, sizeof(buf));
    if (len < 0)
    {
        printf("Error reading file [%d]\n", len);
        return len;
    }
    printf("Read: %s\n", buf);

    close(fd);
    return 0;
}

It will output:

Hello world!
File opened successfully
Read: hello

But if I modify it to: fd = open("/test.txt", O_CREAT | O_RDWR);, it will output Error opening file [-1].

[banana-sun]

I tried again using the latest version of this PR(#4377), but still had this problem.