增加了回调处理，如果放行控制传输数据，可以查看到返回的数据
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kylin_bg
parent
7ce2f1d575
commit
3e4d3d9640
178
libusbMod.c
178
libusbMod.c
@ -1,145 +1,139 @@
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/kprobes.h>
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#include <linux/sched.h> // for current->comm, current->pid
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#include <linux/uaccess.h> // for copy_from_user, copy_to_user (如果需要访问用户空间内存)
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#include <linux/usb.h> // 包含 USB 核心数据结构，如 struct urb
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#include <linux/sched.h>
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#include <linux/uaccess.h>
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#include <linux/usb.h>
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#include <linux/slab.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Leo");
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MODULE_DESCRIPTION("Hook usb_submit_urb ioctl on arm64"); // 这里的注释可能不完全准确，usb_submit_urb不是ioctl，是内核函数
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MODULE_DESCRIPTION("Hook usb_submit_urb() on ARM64 and replace callback");
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static struct kprobe kp;
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// 针对 ARM64 (AArch64) 架构，函数参数通常在 x0, x1, x2... 寄存器中。
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// pt_regs 中的 regs 数组索引通常对应这些寄存器。
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// 对于 AArch64，x0 是 regs[0]，x1 是 regs[1]，以此类推。
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// usb_submit_urb 函数原型通常是：int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
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// 所以第一个参数 struct urb *urb 应该在 x0 寄存器中，对应 regs[0]。
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// 自定义回调上下文，保存原始回调和上下文
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struct urb_context {
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usb_complete_t original_complete;
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void *original_context;
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};
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// 包装回调函数
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static void callback_wrapper(struct urb *urb)
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{
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struct urb_context *ctx = urb->context;
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pr_info("[usbFilter] [callback_wrapper] URB 完成: endpoint=0x%x, status=%d, actual_length=%d\n",
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usb_pipeendpoint(urb->pipe),
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urb->status,
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urb->actual_length);
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if (urb->transfer_buffer && urb->actual_length > 0) {
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char hex[3 * 32 + 1] = {0};
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int i, len = min(32, urb->actual_length);
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unsigned char *data = (unsigned char *)urb->transfer_buffer;
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for (i = 0; i < len; ++i) {
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snprintf(hex + i * 3, sizeof(hex) - i * 3, "%02X ", data[i]);
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}
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pr_info("[usbFilter] [callback_wrapper] 返回数据(hex): %s\n", hex);
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}
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if (ctx && ctx->original_complete) {
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urb->context = ctx->original_context;
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ctx->original_complete(urb);
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}
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kfree(ctx); // 释放上下文
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}
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static int handler_pre(struct kprobe *p, struct pt_regs *regs)
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{
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// !!! 核心修改点：在 ARM64 上，函数第一个参数通常在 x0 (regs[0]) !!!
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struct urb *urb_kern = (struct urb *)regs->regs[0];
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// 严谨的空指针检查
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if (!urb_kern) {
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pr_err("[usbFilter] handler_pre: urb_kern is NULL. Skipping.\n");
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return 0; // KPROBE_OK, 让原始函数继续执行，避免崩溃
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}
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if (!urb_kern)
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return 0;
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// 打印进程信息、PID
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pr_info("[usbFilter] 进程: %s, pid: %d\n",
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current->comm, current->pid);
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pr_info("[usbFilter] 提交 URB 的进程: %s (pid: %d)\n", current->comm, current->pid);
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// 获取并打印 URB 的详细信息
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pr_info("[usbFilter] URB详情: 地址=%p, pipe=0x%08x, 状态=%d, 传输标志=0x%08x\n",
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urb_kern,
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urb_kern->pipe,
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urb_kern->status,
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urb_kern->transfer_flags);
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pr_info("[usbFilter] URB: %p, pipe=0x%x, flags=0x%x\n",
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urb_kern, urb_kern->pipe, urb_kern->transfer_flags);
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// 打印 pipe 的解析信息
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pr_info("[usbFilter] Pipe解析: 设备地址=%d, 端点号=%d, 方向=%s, 类型=%s\n",
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usb_pipedevice(urb_kern->pipe),
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usb_pipeendpoint(urb_kern->pipe),
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usb_pipein(urb_kern->pipe) ? "IN(设备到主机)" : "OUT(主机到设备)",
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usb_pipetype(urb_kern->pipe) == PIPE_CONTROL ? "控制传输" :
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usb_pipetype(urb_kern->pipe) == PIPE_ISOCHRONOUS ? "等时传输" :
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usb_pipetype(urb_kern->pipe) == PIPE_BULK ? "批量传输" :
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usb_pipetype(urb_kern->pipe) == PIPE_INTERRUPT ? "中断传输" : "未知");
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// 端点信息
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if (urb_kern->ep) {
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pr_info("[usbFilter] 端点信息: 地址=0x%02x, 属性=0x%02x, 最大包大小=%d, 间隔=%d\n",
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urb_kern->ep->desc.bEndpointAddress,
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urb_kern->ep->desc.bmAttributes,
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urb_kern->ep->desc.wMaxPacketSize,
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urb_kern->ep->desc.bInterval);
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} else {
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pr_info("[usbFilter] 端点信息: urb_kern->ep 为 NULL\n");
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}
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// 打印设备信息（如果可用）
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if (urb_kern->dev) {
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pr_info("[usbFilter] USB设备: VID=0x%04x, PID=0x%04x\n",
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urb_kern->dev->descriptor.idVendor,
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urb_kern->dev->descriptor.idProduct);
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;
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}
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// 传输缓冲区信息
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pr_info("[usbFilter] 传输缓冲区: buffer=%p, length=%d, actual_length=%d\n",
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urb_kern->transfer_buffer,
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urb_kern->transfer_buffer_length,
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urb_kern->actual_length);
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// 打印传输方向与类型
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pr_info("[usbFilter] pipe: 端点=%d, 方向=%s, 类型=%s\n",
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usb_pipeendpoint(urb_kern->pipe),
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usb_pipein(urb_kern->pipe) ? "IN" : "OUT",
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usb_pipetype(urb_kern->pipe) == PIPE_CONTROL ? "CONTROL" :
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usb_pipetype(urb_kern->pipe) == PIPE_ISOCHRONOUS ? "ISO" :
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usb_pipetype(urb_kern->pipe) == PIPE_BULK ? "BULK" :
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usb_pipetype(urb_kern->pipe) == PIPE_INTERRUPT ? "INTERRUPT" : "UNKNOWN");
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// 如果是等时传输，打印相关信息
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if (usb_pipetype(urb_kern->pipe) == PIPE_ISOCHRONOUS) {
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pr_info("[usbFilter] 等时传输: number_of_packets=%d, start_frame=%d, error_count=%d\n",
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urb_kern->number_of_packets,
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urb_kern->start_frame,
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urb_kern->error_count);
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}
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// 如果是控制传输，打印setup包
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if (usb_pipetype(urb_kern->pipe) == PIPE_CONTROL && urb_kern->setup_packet) {
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struct usb_ctrlrequest *setup = (struct usb_ctrlrequest *)urb_kern->setup_packet;
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pr_info("[usbFilter] 控制传输Setup包: bRequestType=0x%02x, bRequest=0x%02x, wValue=0x%04x, wIndex=0x%04x, wLength=%u\n",
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setup->bRequestType, setup->bRequest,
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le16_to_cpu(setup->wValue), le16_to_cpu(setup->wIndex),
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le16_to_cpu(setup->wLength));
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}
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// 传输数据内容打印
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// 打印前 32 字节传输数据
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if (urb_kern->transfer_buffer && urb_kern->transfer_buffer_length > 0) {
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unsigned char data[32] = {0}; // 增加到32字节
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unsigned int to_copy = min((unsigned int)32, urb_kern->transfer_buffer_length);
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unsigned char data[32] = {0};
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unsigned int to_copy = min(32U, (unsigned int)urb_kern->transfer_buffer_length);
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memcpy(data, urb_kern->transfer_buffer, to_copy);
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// 尝试从用户空间拷贝
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if (copy_from_user(data, urb_kern->transfer_buffer, to_copy) != 0) { // 0 表示成功
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memcpy(data, urb_kern->transfer_buffer, to_copy);
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}
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char hex[3 * 32 + 1] = {0}; // 修改为适应32字节的大小
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char hex[3 * 32 + 1] = {0};
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int i;
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for (i = 0; i < to_copy; ++i) {
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// 确保 snprintf 不会溢出 hex 缓冲区
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snprintf(hex + i * 3, sizeof(hex) - (i * 3), "%02X ", data[i]);
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snprintf(hex + i * 3, sizeof(hex) - i * 3, "%02X ", data[i]);
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}
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pr_info("[usbFilter] 数据内容(hex, %u字节): %s\n", to_copy, hex);
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pr_info("[usbFilter] 数据内容(hex): %s\n", hex);
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}
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if(urb_kern->dev->descriptor.idVendor == 0x1a86 && urb_kern->dev->descriptor.idProduct == 0x55de) {
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pr_info("[usbFilter] 发现目标设备，阻断提交URB\n");
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regs->regs[0] = 0; // 设置 x0 寄存器（返回值）为 0 (成功)
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return 1;
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// 是否为目标设备
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if (urb_kern->dev &&
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urb_kern->dev->descriptor.idVendor == 0x1a86 &&
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urb_kern->dev->descriptor.idProduct == 0x55de) {
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pr_info("[usbFilter] 命中目标设备，替换 URB 回调\n");
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struct urb_context *ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC);
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if (!ctx) {
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pr_err("[usbFilter] 分配回调上下文失败\n");
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return 0;
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}
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ctx->original_complete = urb_kern->complete;
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ctx->original_context = urb_kern->context;
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urb_kern->complete = callback_wrapper;
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urb_kern->context = ctx;
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// 可以选择返回 0，让 URB 正常提交；也可以选择模拟成功阻断：
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// regs->regs[0] = 0;
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// return 1;
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}
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return 0;
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}
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static int __init usb_hook_init(void)
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{
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// usb_submit_urb 是一个导出的符号，Kprobe 可以 Hook
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kp.symbol_name = "usb_submit_urb";
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kp.pre_handler = handler_pre;
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if (register_kprobe(&kp) < 0) {
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pr_err("[usbFilter] register_kprobe failed\n");
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pr_err("[usbFilter] 无法注册 kprobe\n");
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return -1;
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}
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pr_info("[usbFilter] kprobe registered for %s at %p\n", kp.symbol_name, kp.addr);
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pr_info("[usbFilter] 成功 hook usb_submit_urb()\n");
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return 0;
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}
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static void __exit usb_hook_exit(void)
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{
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unregister_kprobe(&kp);
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pr_info("[usbFilter] kprobe unregistered\n");
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pr_info("[usbFilter] 已卸载 usb_submit_urb hook\n");
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}
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module_init(usb_hook_init);
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module_exit(usb_hook_exit);
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module_exit(usb_hook_exit);
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