为了了解Linux内核,我编写了一个模块,它用我的自定义(custom_sys_open)函数覆盖系统调用sys_open。我的custom_file_open代码:-
#define CUSTOM_CHECK_FILE "/home/xxxx/Programming/kernel_module/custom.txt"
asmlinkage long custom_file_open(const char __user *fileName, int flags, umode_t mode)
{
long retVal = 0;
int len = strlen(
我当时正在阅读Linux开发,并试图理解fork()情况下的进程地址空间语义。当我在Kernel v2.6的上下文中阅读时,以及在新版本中,任何子版本或父版本都可能先运行,但我对以下内容感到困惑:
Back in do_fork(), if copy_process() returns successfully, the new child is woken up
and run. Deliberately, the kernel runs the child process first. In the common case of the
child simply calling exec(
我知道如何在现代Linux内核中劫持系统调用,足以为它们设计简单的替代程序。我用来劫持系统调用的代码通常如下所示:
static unsigned long *sys_call_table = (unsigned long*)<address of system call table>;
…
int make_rw(unsigned long address) {
unsigned int level;
pte_t *pte = lookup_address(address, &level);
if (pte->pte &~ _PAGE
Java不安全类允许您为对象分配内存,如下所示,但使用此方法,如何释放完成时分配的内存,因为它没有提供内存地址.
Field f = Unsafe.class.getDeclaredField("theUnsafe"); //Internal reference
f.setAccessible(true);
Unsafe unsafe = (Unsafe) f.get(null);
//This creates an instance of player class without any initialization
Player p