[英]How i get absolute path in kernel space from file descriptor
我試圖掛鈎unlinkat.my掛鈎功能。
但我只得到文件名而不是絕對路徑。所以我想要絕對路徑來比較字符串。當我嘗試rm -r而不是我只得到文件名如果我得到絕對路徑然后它的工作。所以請告訴我如何獲得絕對路徑。
我的代碼是
long mw_sys_unlink(int dfd, const char *filename ,int flag)
{
long ret;
if( strstr(filename,"/tmp/a/"))
{
printk(KERN_INFO "file %s has not been deleted by kernel module\n", filename);
return -1;
}
else
{
ret = orig_sys_unlink(dfd ,filename,flag);
printk(KERN_INFO "file %s has been deleted", filename);
return ret;
}
}
請嘗試以下方法:
char *tmp = (char*)__get_free_page(GFP_TEMPORARY);
file *file = fget(dfd);
if (!file) {
goto out
}
char *path = d_path(&file->f_path, tmp, PAGE_SIZE);
if (IS_ERR(path)) {
printk("error: %d\n", (int)path);
goto out;
}
printk("path: %s\n", path);
out:
free_page((unsigned long)tmp);
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