Trying it out – viewing kernel segment details

For clarity, we will show only relevant parts of the source code in this section. Do clone and use the complete code from this book's GitHub repository. Also, recall the procmap utility mentioned earlier; it has a kernel component, an LKM, which indeed does a similar job to this one – making kernel-level information available to user space. With it being more sophisticated, we won't delve into its code here; seeing the code of the following demo kernel module show_kernel_seg is more than sufficient here:

// ch7/show_kernel_seg/kernel_seg.c
[...]
static void show_kernelseg_info(void)
{
    pr_info("\nSome Kernel Details [by decreasing address]\n"
    "+-------------------------------------------------------------+\n");
#ifdef CONFIG_ARM
  /* On ARM, the definition of VECTORS_BASE turns up only in kernels >= 4.11 */
#if LINUX_VERSION_CODE > KERNEL_VERSION(4, 11, 0)
    pr_info("|vector table...