Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/*
 *	fs/proc/kcore.c kernel ELF core dumper
 *
 *	Modelled on fs/exec.c:aout_core_dump()
 *	Jeremy Fitzhardinge <jeremy@sw.oz.au>
 *	ELF version written by David Howells <David.Howells@nexor.co.uk>
 *	Modified and incorporated into 2.3.x by Tigran Aivazian <tigran@veritas.com>
 *	Support to dump vmalloc'd areas (ELF only), Tigran Aivazian <tigran@veritas.com>
 *	Safe accesses to vmalloc/direct-mapped discontiguous areas, Kanoj Sarcar <kanoj@sgi.com>
 */
 
#include <linux/crash_core.h>
#include <linux/mm.h>
#include <linux/proc_fs.h>
#include <linux/kcore.h>
#include <linux/user.h>
#include <linux/capability.h>
#include <linux/elf.h>
#include <linux/elfcore.h>
#include <linux/notifier.h>
#include <linux/vmalloc.h>
#include <linux/highmem.h>
#include <linux/printk.h>
#include <linux/memblock.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <asm/io.h>
#include <linux/list.h>
#include <linux/ioport.h>
#include <linux/memory.h>
#include <linux/sched/task.h>
#include <linux/security.h>
#include <asm/sections.h>
#include "internal.h"
 
#define CORE_STR "CORE"
 
#ifndef ELF_CORE_EFLAGS
#define ELF_CORE_EFLAGS	0
#endif
 
static struct proc_dir_entry *proc_root_kcore;
 
 
#ifndef kc_vaddr_to_offset
#define	kc_vaddr_to_offset(v) ((v) - PAGE_OFFSET)
#endif
#ifndef	kc_offset_to_vaddr
#define	kc_offset_to_vaddr(o) ((o) + PAGE_OFFSET)
#endif
 
static LIST_HEAD(kclist_head);
static DECLARE_RWSEM(kclist_lock);
static int kcore_need_update = 1;
 
/*
 * Returns > 0 for RAM pages, 0 for non-RAM pages, < 0 on error
 * Same as oldmem_pfn_is_ram in vmcore
 */
static int (*mem_pfn_is_ram)(unsigned long pfn);
 
int __init register_mem_pfn_is_ram(int (*fn)(unsigned long pfn))
{
<------>if (mem_pfn_is_ram)
<------><------>return -EBUSY;
<------>mem_pfn_is_ram = fn;
<------>return 0;
}
 
static int pfn_is_ram(unsigned long pfn)
{
<------>if (mem_pfn_is_ram)
<------><------>return mem_pfn_is_ram(pfn);
<------>else
<------><------>return 1;
}
 
/* This doesn't grab kclist_lock, so it should only be used at init time. */
void __init kclist_add(struct kcore_list *new, void *addr, size_t size,
<------><------>       int type)
{
<------>new->addr = (unsigned long)addr;
<------>new->size = size;
<------>new->type = type;
 
<------>list_add_tail(&new->list, &kclist_head);
}
 
static size_t get_kcore_size(int *nphdr, size_t *phdrs_len, size_t *notes_len,
<------><------><------>     size_t *data_offset)
{
<------>size_t try, size;
<------>struct kcore_list *m;
 
<------>*nphdr = 1; /* PT_NOTE */
<------>size = 0;
 
<------>list_for_each_entry(m, &kclist_head, list) {
<------><------>try = kc_vaddr_to_offset((size_t)m->addr + m->size);
<------><------>if (try > size)
<------><------><------>size = try;
<------><------>*nphdr = *nphdr + 1;
<------>}
 
<------>*phdrs_len = *nphdr * sizeof(struct elf_phdr);
<------>*notes_len = (4 * sizeof(struct elf_note) +
<------><------>      3 * ALIGN(sizeof(CORE_STR), 4) +
<------><------>      VMCOREINFO_NOTE_NAME_BYTES +
<------><------>      ALIGN(sizeof(struct elf_prstatus), 4) +
<------><------>      ALIGN(sizeof(struct elf_prpsinfo), 4) +
<------><------>      ALIGN(arch_task_struct_size, 4) +
<------><------>      ALIGN(vmcoreinfo_size, 4));
<------>*data_offset = PAGE_ALIGN(sizeof(struct elfhdr) + *phdrs_len +
<------><------><------><------>  *notes_len);
<------>return *data_offset + size;
}
 
#ifdef CONFIG_HIGHMEM
/*
 * If no highmem, we can assume [0...max_low_pfn) continuous range of memory
 * because memory hole is not as big as !HIGHMEM case.
 * (HIGHMEM is special because part of memory is _invisible_ from the kernel.)
 */
static int kcore_ram_list(struct list_head *head)
{
<------>struct kcore_list *ent;
 
<------>ent = kmalloc(sizeof(*ent), GFP_KERNEL);
<------>if (!ent)
<------><------>return -ENOMEM;
<------>ent->addr = (unsigned long)__va(0);
<------>ent->size = max_low_pfn << PAGE_SHIFT;
<------>ent->type = KCORE_RAM;
<------>list_add(&ent->list, head);
<------>return 0;
}
 
#else /* !CONFIG_HIGHMEM */
 
#ifdef CONFIG_SPARSEMEM_VMEMMAP
/* calculate vmemmap's address from given system ram pfn and register it */
static int
get_sparsemem_vmemmap_info(struct kcore_list *ent, struct list_head *head)
{
<------>unsigned long pfn = __pa(ent->addr) >> PAGE_SHIFT;
<------>unsigned long nr_pages = ent->size >> PAGE_SHIFT;
<------>unsigned long start, end;
<------>struct kcore_list *vmm, *tmp;
 
 
<------>start = ((unsigned long)pfn_to_page(pfn)) & PAGE_MASK;
<------>end = ((unsigned long)pfn_to_page(pfn + nr_pages)) - 1;
<------>end = PAGE_ALIGN(end);
<------>/* overlap check (because we have to align page */
<------>list_for_each_entry(tmp, head, list) {
<------><------>if (tmp->type != KCORE_VMEMMAP)
<------><------><------>continue;
<------><------>if (start < tmp->addr + tmp->size)
<------><------><------>if (end > tmp->addr)
<------><------><------><------>end = tmp->addr;
<------>}
<------>if (start < end) {
<------><------>vmm = kmalloc(sizeof(*vmm), GFP_KERNEL);
<------><------>if (!vmm)
<------><------><------>return 0;
<------><------>vmm->addr = start;
<------><------>vmm->size = end - start;
<------><------>vmm->type = KCORE_VMEMMAP;
<------><------>list_add_tail(&vmm->list, head);
<------>}
<------>return 1;
 
}
#else
static int
get_sparsemem_vmemmap_info(struct kcore_list *ent, struct list_head *head)
{
<------>return 1;
}
 
#endif
 
static int
kclist_add_private(unsigned long pfn, unsigned long nr_pages, void *arg)
{
<------>struct list_head *head = (struct list_head *)arg;
<------>struct kcore_list *ent;
<------>struct page *p;
 
<------>if (!pfn_valid(pfn))
<------><------>return 1;
 
<------>p = pfn_to_page(pfn);
<------>if (!memmap_valid_within(pfn, p, page_zone(p)))
<------><------>return 1;
 
<------>ent = kmalloc(sizeof(*ent), GFP_KERNEL);
<------>if (!ent)
<------><------>return -ENOMEM;
<------>ent->addr = (unsigned long)page_to_virt(p);
<------>ent->size = nr_pages << PAGE_SHIFT;
 
<------>if (!virt_addr_valid(ent->addr))
<------><------>goto free_out;
 
<------>/* cut not-mapped area. ....from ppc-32 code. */
<------>if (ULONG_MAX - ent->addr < ent->size)
<------><------>ent->size = ULONG_MAX - ent->addr;
 
<------>/*
<------> * We've already checked virt_addr_valid so we know this address
<------> * is a valid pointer, therefore we can check against it to determine
<------> * if we need to trim
<------> */
<------>if (VMALLOC_START > ent->addr) {
<------><------>if (VMALLOC_START - ent->addr < ent->size)
<------><------><------>ent->size = VMALLOC_START - ent->addr;
<------>}
 
<------>ent->type = KCORE_RAM;
<------>list_add_tail(&ent->list, head);
 
<------>if (!get_sparsemem_vmemmap_info(ent, head)) {
<------><------>list_del(&ent->list);
<------><------>goto free_out;
<------>}
 
<------>return 0;
free_out:
<------>kfree(ent);
<------>return 1;
}
 
static int kcore_ram_list(struct list_head *list)
{
<------>int nid, ret;
<------>unsigned long end_pfn;
 
<------>/* Not inialized....update now */
<------>/* find out "max pfn" */
<------>end_pfn = 0;
<------>for_each_node_state(nid, N_MEMORY) {
<------><------>unsigned long node_end;
<------><------>node_end = node_end_pfn(nid);
<------><------>if (end_pfn < node_end)
<------><------><------>end_pfn = node_end;
<------>}
<------>/* scan 0 to max_pfn */
<------>ret = walk_system_ram_range(0, end_pfn, list, kclist_add_private);
<------>if (ret)
<------><------>return -ENOMEM;
<------>return 0;
}
#endif /* CONFIG_HIGHMEM */
 
static int kcore_update_ram(void)
{
<------>LIST_HEAD(list);
<------>LIST_HEAD(garbage);
<------>int nphdr;
<------>size_t phdrs_len, notes_len, data_offset;
<------>struct kcore_list *tmp, *pos;
<------>int ret = 0;
 
<------>down_write(&kclist_lock);
<------>if (!xchg(&kcore_need_update, 0))
<------><------>goto out;
 
<------>ret = kcore_ram_list(&list);
<------>if (ret) {
<------><------>/* Couldn't get the RAM list, try again next time. */
<------><------>WRITE_ONCE(kcore_need_update, 1);
<------><------>list_splice_tail(&list, &garbage);
<------><------>goto out;
<------>}
 
<------>list_for_each_entry_safe(pos, tmp, &kclist_head, list) {
<------><------>if (pos->type == KCORE_RAM || pos->type == KCORE_VMEMMAP)
<------><------><------>list_move(&pos->list, &garbage);
<------>}
<------>list_splice_tail(&list, &kclist_head);
 
<------>proc_root_kcore->size = get_kcore_size(&nphdr, &phdrs_len, &notes_len,
<------><------><------><------><------>       &data_offset);
 
out:
<------>up_write(&kclist_lock);
<------>list_for_each_entry_safe(pos, tmp, &garbage, list) {
<------><------>list_del(&pos->list);
<------><------>kfree(pos);
<------>}
<------>return ret;
}
 
static void append_kcore_note(char *notes, size_t *i, const char *name,
<------><------><------>      unsigned int type, const void *desc,
<------><------><------>      size_t descsz)
{
<------>struct elf_note *note = (struct elf_note *)&notes[*i];
 
<------>note->n_namesz = strlen(name) + 1;
<------>note->n_descsz = descsz;
<------>note->n_type = type;
<------>*i += sizeof(*note);
<------>memcpy(&notes[*i], name, note->n_namesz);
<------>*i = ALIGN(*i + note->n_namesz, 4);
<------>memcpy(&notes[*i], desc, descsz);
<------>*i = ALIGN(*i + descsz, 4);
}
 
static ssize_t
read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos)
{
<------>char *buf = file->private_data;
<------>size_t phdrs_offset, notes_offset, data_offset;
<------>size_t phdrs_len, notes_len;
<------>struct kcore_list *m;
<------>size_t tsz;
<------>int nphdr;
<------>unsigned long start;
<------>size_t orig_buflen = buflen;
<------>int ret = 0;
 
<------>down_read(&kclist_lock);
 
<------>get_kcore_size(&nphdr, &phdrs_len, &notes_len, &data_offset);
<------>phdrs_offset = sizeof(struct elfhdr);
<------>notes_offset = phdrs_offset + phdrs_len;
 
<------>/* ELF file header. */
<------>if (buflen && *fpos < sizeof(struct elfhdr)) {
<------><------>struct elfhdr ehdr = {
<------><------><------>.e_ident = {
<------><------><------><------>[EI_MAG0] = ELFMAG0,
<------><------><------><------>[EI_MAG1] = ELFMAG1,
<------><------><------><------>[EI_MAG2] = ELFMAG2,
<------><------><------><------>[EI_MAG3] = ELFMAG3,
<------><------><------><------>[EI_CLASS] = ELF_CLASS,
<------><------><------><------>[EI_DATA] = ELF_DATA,
<------><------><------><------>[EI_VERSION] = EV_CURRENT,
<------><------><------><------>[EI_OSABI] = ELF_OSABI,
<------><------><------>},
<------><------><------>.e_type = ET_CORE,
<------><------><------>.e_machine = ELF_ARCH,
<------><------><------>.e_version = EV_CURRENT,
<------><------><------>.e_phoff = sizeof(struct elfhdr),
<------><------><------>.e_flags = ELF_CORE_EFLAGS,
<------><------><------>.e_ehsize = sizeof(struct elfhdr),
<------><------><------>.e_phentsize = sizeof(struct elf_phdr),
<------><------><------>.e_phnum = nphdr,
<------><------>};
 
<------><------>tsz = min_t(size_t, buflen, sizeof(struct elfhdr) - *fpos);
<------><------>if (copy_to_user(buffer, (char *)&ehdr + *fpos, tsz)) {
<------><------><------>ret = -EFAULT;
<------><------><------>goto out;
<------><------>}
 
<------><------>buffer += tsz;
<------><------>buflen -= tsz;
<------><------>*fpos += tsz;
<------>}
 
<------>/* ELF program headers. */
<------>if (buflen && *fpos < phdrs_offset + phdrs_len) {
<------><------>struct elf_phdr *phdrs, *phdr;
 
<------><------>phdrs = kzalloc(phdrs_len, GFP_KERNEL);
<------><------>if (!phdrs) {
<------><------><------>ret = -ENOMEM;
<------><------><------>goto out;
<------><------>}
 
<------><------>phdrs[0].p_type = PT_NOTE;
<------><------>phdrs[0].p_offset = notes_offset;
<------><------>phdrs[0].p_filesz = notes_len;
 
<------><------>phdr = &phdrs[1];
<------><------>list_for_each_entry(m, &kclist_head, list) {
<------><------><------>phdr->p_type = PT_LOAD;
<------><------><------>phdr->p_flags = PF_R | PF_W | PF_X;
<------><------><------>phdr->p_offset = kc_vaddr_to_offset(m->addr) + data_offset;
<------><------><------>if (m->type == KCORE_REMAP)
<------><------><------><------>phdr->p_vaddr = (size_t)m->vaddr;
<------><------><------>else
<------><------><------><------>phdr->p_vaddr = (size_t)m->addr;
<------><------><------>if (m->type == KCORE_RAM || m->type == KCORE_REMAP)
<------><------><------><------>phdr->p_paddr = __pa(m->addr);
<------><------><------>else if (m->type == KCORE_TEXT)
<------><------><------><------>phdr->p_paddr = __pa_symbol(m->addr);
<------><------><------>else
<------><------><------><------>phdr->p_paddr = (elf_addr_t)-1;
<------><------><------>phdr->p_filesz = phdr->p_memsz = m->size;
<------><------><------>phdr->p_align = PAGE_SIZE;
<------><------><------>phdr++;
<------><------>}
 
<------><------>tsz = min_t(size_t, buflen, phdrs_offset + phdrs_len - *fpos);
<------><------>if (copy_to_user(buffer, (char *)phdrs + *fpos - phdrs_offset,
<------><------><------><------> tsz)) {
<------><------><------>kfree(phdrs);
<------><------><------>ret = -EFAULT;
<------><------><------>goto out;
<------><------>}
<------><------>kfree(phdrs);
 
<------><------>buffer += tsz;
<------><------>buflen -= tsz;
<------><------>*fpos += tsz;
<------>}
 
<------>/* ELF note segment. */
<------>if (buflen && *fpos < notes_offset + notes_len) {
<------><------>struct elf_prstatus prstatus = {};
<------><------>struct elf_prpsinfo prpsinfo = {
<------><------><------>.pr_sname = 'R',
<------><------><------>.pr_fname = "vmlinux",
<------><------>};
<------><------>char *notes;
<------><------>size_t i = 0;
 
<------><------>strlcpy(prpsinfo.pr_psargs, saved_command_line,
<------><------><------>sizeof(prpsinfo.pr_psargs));
 
<------><------>notes = kzalloc(notes_len, GFP_KERNEL);
<------><------>if (!notes) {
<------><------><------>ret = -ENOMEM;
<------><------><------>goto out;
<------><------>}
 
<------><------>append_kcore_note(notes, &i, CORE_STR, NT_PRSTATUS, &prstatus,
<------><------><------><------>  sizeof(prstatus));
<------><------>append_kcore_note(notes, &i, CORE_STR, NT_PRPSINFO, &prpsinfo,
<------><------><------><------>  sizeof(prpsinfo));
<------><------>append_kcore_note(notes, &i, CORE_STR, NT_TASKSTRUCT, current,
<------><------><------><------>  arch_task_struct_size);
<------><------>/*
<------><------> * vmcoreinfo_size is mostly constant after init time, but it
<------><------> * can be changed by crash_save_vmcoreinfo(). Racing here with a
<------><------> * panic on another CPU before the machine goes down is insanely
<------><------> * unlikely, but it's better to not leave potential buffer
<------><------> * overflows lying around, regardless.
<------><------> */
<------><------>append_kcore_note(notes, &i, VMCOREINFO_NOTE_NAME, 0,
<------><------><------><------>  vmcoreinfo_data,
<------><------><------><------>  min(vmcoreinfo_size, notes_len - i));
 
<------><------>tsz = min_t(size_t, buflen, notes_offset + notes_len - *fpos);
<------><------>if (copy_to_user(buffer, notes + *fpos - notes_offset, tsz)) {
<------><------><------>kfree(notes);
<------><------><------>ret = -EFAULT;
<------><------><------>goto out;
<------><------>}
<------><------>kfree(notes);
 
<------><------>buffer += tsz;
<------><------>buflen -= tsz;
<------><------>*fpos += tsz;
<------>}
 
<------>/*
<------> * Check to see if our file offset matches with any of
<------> * the addresses in the elf_phdr on our list.
<------> */
<------>start = kc_offset_to_vaddr(*fpos - data_offset);
<------>if ((tsz = (PAGE_SIZE - (start & ~PAGE_MASK))) > buflen)
<------><------>tsz = buflen;
 
<------>m = NULL;
<------>while (buflen) {
<------><------>/*
<------><------> * If this is the first iteration or the address is not within
<------><------> * the previous entry, search for a matching entry.
<------><------> */
<------><------>if (!m || start < m->addr || start >= m->addr + m->size) {
<------><------><------>list_for_each_entry(m, &kclist_head, list) {
<------><------><------><------>if (start >= m->addr &&
<------><------><------><------>    start < m->addr + m->size)
<------><------><------><------><------>break;
<------><------><------>}
<------><------>}
 
<------><------>if (&m->list == &kclist_head) {
<------><------><------>if (clear_user(buffer, tsz)) {
<------><------><------><------>ret = -EFAULT;
<------><------><------><------>goto out;
<------><------><------>}
<------><------><------>m = NULL;	/* skip the list anchor */
<------><------>} else if (!pfn_is_ram(__pa(start) >> PAGE_SHIFT)) {
<------><------><------>if (clear_user(buffer, tsz)) {
<------><------><------><------>ret = -EFAULT;
<------><------><------><------>goto out;
<------><------><------>}
<------><------>} else if (m->type == KCORE_VMALLOC) {
<------><------><------>vread(buf, (char *)start, tsz);
<------><------><------>/* we have to zero-fill user buffer even if no read */
<------><------><------>if (copy_to_user(buffer, buf, tsz)) {
<------><------><------><------>ret = -EFAULT;
<------><------><------><------>goto out;
<------><------><------>}
<------><------>} else if (m->type == KCORE_USER) {
<------><------><------>/* User page is handled prior to normal kernel page: */
<------><------><------>if (copy_to_user(buffer, (char *)start, tsz)) {
<------><------><------><------>ret = -EFAULT;
<------><------><------><------>goto out;
<------><------><------>}
<------><------>} else {
<------><------><------>if (kern_addr_valid(start)) {
<------><------><------><------>/*
<------><------><------><------> * Using bounce buffer to bypass the
<------><------><------><------> * hardened user copy kernel text checks.
<------><------><------><------> */
<------><------><------><------>if (copy_from_kernel_nofault(buf, (void *)start,
<------><------><------><------><------><------>tsz)) {
<------><------><------><------><------>if (clear_user(buffer, tsz)) {
<------><------><------><------><------><------>ret = -EFAULT;
<------><------><------><------><------><------>goto out;
<------><------><------><------><------>}
<------><------><------><------>} else {
<------><------><------><------><------>if (copy_to_user(buffer, buf, tsz)) {
<------><------><------><------><------><------>ret = -EFAULT;
<------><------><------><------><------><------>goto out;
<------><------><------><------><------>}
<------><------><------><------>}
<------><------><------>} else {
<------><------><------><------>if (clear_user(buffer, tsz)) {
<------><------><------><------><------>ret = -EFAULT;
<------><------><------><------><------>goto out;
<------><------><------><------>}
<------><------><------>}
<------><------>}
<------><------>buflen -= tsz;
<------><------>*fpos += tsz;
<------><------>buffer += tsz;
<------><------>start += tsz;
<------><------>tsz = (buflen > PAGE_SIZE ? PAGE_SIZE : buflen);
<------>}
 
out:
<------>up_read(&kclist_lock);
<------>if (ret)
<------><------>return ret;
<------>return orig_buflen - buflen;
}
 
static int open_kcore(struct inode *inode, struct file *filp)
{
<------>int ret = security_locked_down(LOCKDOWN_KCORE);
 
<------>if (!capable(CAP_SYS_RAWIO))
<------><------>return -EPERM;
 
<------>if (ret)
<------><------>return ret;
 
<------>filp->private_data = kmalloc(PAGE_SIZE, GFP_KERNEL);
<------>if (!filp->private_data)
<------><------>return -ENOMEM;
 
<------>if (kcore_need_update)
<------><------>kcore_update_ram();
<------>if (i_size_read(inode) != proc_root_kcore->size) {
<------><------>inode_lock(inode);
<------><------>i_size_write(inode, proc_root_kcore->size);
<------><------>inode_unlock(inode);
<------>}
<------>return 0;
}
 
static int release_kcore(struct inode *inode, struct file *file)
{
<------>kfree(file->private_data);
<------>return 0;
}
 
static const struct proc_ops kcore_proc_ops = {
<------>.proc_read	= read_kcore,
<------>.proc_open	= open_kcore,
<------>.proc_release	= release_kcore,
<------>.proc_lseek	= default_llseek,
};
 
/* just remember that we have to update kcore */
static int __meminit kcore_callback(struct notifier_block *self,
<------><------><------><------>    unsigned long action, void *arg)
{
<------>switch (action) {
<------>case MEM_ONLINE:
<------>case MEM_OFFLINE:
<------><------>kcore_need_update = 1;
<------><------>break;
<------>}
<------>return NOTIFY_OK;
}
 
static struct notifier_block kcore_callback_nb __meminitdata = {
<------>.notifier_call = kcore_callback,
<------>.priority = 0,
};
 
static struct kcore_list kcore_vmalloc;
 
#ifdef CONFIG_ARCH_PROC_KCORE_TEXT
static struct kcore_list kcore_text;
/*
 * If defined, special segment is used for mapping kernel text instead of
 * direct-map area. We need to create special TEXT section.
 */
static void __init proc_kcore_text_init(void)
{
<------>kclist_add(&kcore_text, _text, _end - _text, KCORE_TEXT);
}
#else
static void __init proc_kcore_text_init(void)
{
}
#endif
 
#if defined(CONFIG_MODULES) && defined(MODULES_VADDR)
/*
 * MODULES_VADDR has no intersection with VMALLOC_ADDR.
 */
static struct kcore_list kcore_modules;
static void __init add_modules_range(void)
{
<------>if (MODULES_VADDR != VMALLOC_START && MODULES_END != VMALLOC_END) {
<------><------>kclist_add(&kcore_modules, (void *)MODULES_VADDR,
<------><------><------>MODULES_END - MODULES_VADDR, KCORE_VMALLOC);
<------>}
}
#else
static void __init add_modules_range(void)
{
}
#endif
 
static int __init proc_kcore_init(void)
{
<------>proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &kcore_proc_ops);
<------>if (!proc_root_kcore) {
<------><------>pr_err("couldn't create /proc/kcore\n");
<------><------>return 0; /* Always returns 0. */
<------>}
<------>/* Store text area if it's special */
<------>proc_kcore_text_init();
<------>/* Store vmalloc area */
<------>kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
<------><------>VMALLOC_END - VMALLOC_START, KCORE_VMALLOC);
<------>add_modules_range();
<------>/* Store direct-map area from physical memory map */
<------>kcore_update_ram();
<------>register_hotmemory_notifier(&kcore_callback_nb);
 
<------>return 0;
}
fs_initcall(proc_kcore_init);