> +static void seq_print_vma_name(struct seq_file *m, struct vm_area_struct *vma)
> +{
> + const char __user *name = vma_get_anon_name(vma);
> + struct mm_struct *mm = vma->vm_mm;
> +
> + unsigned long page_start_vaddr;
> + unsigned long page_offset;
> + unsigned long num_pages;
> + unsigned long max_len = NAME_MAX;
> + int i;
> +
> + page_start_vaddr = (unsigned long)name & PAGE_MASK;
> + page_offset = (unsigned long)name - page_start_vaddr;
> + num_pages = DIV_ROUND_UP(page_offset + max_len, PAGE_SIZE);
> +
> + seq_puts(m, "[anon:");
> +
> + for (i = 0; i < num_pages; i++) {
> + int len;
> + int write_len;
> + const char *kaddr;
> + long pages_pinned;
> + struct page *page;
> +
> + pages_pinned = get_user_pages(current, mm, page_start_vaddr,
> + 1, 0, 0, &page, NULL);
> + if (pages_pinned < 1) {
> + seq_puts(m, "<fault>]");
> + return;
> + }
> +
> + kaddr = (const char *)kmap(page);
> + len = min(max_len, PAGE_SIZE - page_offset);
You can't show the name if the name is placed in end of page.
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