1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * Copyright (C) 2011 Richard Weinberger <richrd@nod.at>
 
 
 
 
 4 */
 5
 6#include <linux/mm.h>
 7#include <asm/elf.h>
 
 8
 9static struct vm_area_struct gate_vma;
10
11static int __init gate_vma_init(void)
12{
13	if (!FIXADDR_USER_START)
14		return 0;
15
16	vma_init(&gate_vma, NULL);
17	gate_vma.vm_start = FIXADDR_USER_START;
18	gate_vma.vm_end = FIXADDR_USER_END;
19	vm_flags_init(&gate_vma, VM_READ | VM_MAYREAD | VM_EXEC | VM_MAYEXEC);
20	gate_vma.vm_page_prot = PAGE_READONLY;
21
22	return 0;
23}
24__initcall(gate_vma_init);
25
26struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
27{
28	return FIXADDR_USER_START ? &gate_vma : NULL;
29}
30
31int in_gate_area_no_mm(unsigned long addr)
32{
33	if (!FIXADDR_USER_START)
34		return 0;
35
36	if ((addr >= FIXADDR_USER_START) && (addr < FIXADDR_USER_END))
37		return 1;
38
39	return 0;
40}
41
42int in_gate_area(struct mm_struct *mm, unsigned long addr)
43{
44	struct vm_area_struct *vma = get_gate_vma(mm);
45
46	if (!vma)
47		return 0;
48
49	return (addr >= vma->vm_start) && (addr < vma->vm_end);
50}

 
 1/*
 2 * Copyright (C) 2011 Richard Weinberger <richrd@nod.at>
 3 *
 4 * This program is free software; you can redistribute it and/or modify
 5 * it under the terms of the GNU General Public License version 2 as
 6 * published by the Free Software Foundation.
 7 */
 8
 9#include <linux/mm.h>
10#include <asm/page.h>
11#include <asm/mman.h>
12
13static struct vm_area_struct gate_vma;
14
15static int __init gate_vma_init(void)
16{
17	if (!FIXADDR_USER_START)
18		return 0;
19
20	gate_vma.vm_mm = NULL;
21	gate_vma.vm_start = FIXADDR_USER_START;
22	gate_vma.vm_end = FIXADDR_USER_END;
23	gate_vma.vm_flags = VM_READ | VM_MAYREAD | VM_EXEC | VM_MAYEXEC;
24	gate_vma.vm_page_prot = __P101;
25
26	return 0;
27}
28__initcall(gate_vma_init);
29
30struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
31{
32	return FIXADDR_USER_START ? &gate_vma : NULL;
33}
34
35int in_gate_area_no_mm(unsigned long addr)
36{
37	if (!FIXADDR_USER_START)
38		return 0;
39
40	if ((addr >= FIXADDR_USER_START) && (addr < FIXADDR_USER_END))
41		return 1;
42
43	return 0;
44}
45
46int in_gate_area(struct mm_struct *mm, unsigned long addr)
47{
48	struct vm_area_struct *vma = get_gate_vma(mm);
49
50	if (!vma)
51		return 0;
52
53	return (addr >= vma->vm_start) && (addr < vma->vm_end);
54}