Commit | Line | Data |
---|---|---|
d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
548f0a4e RW |
2 | /* |
3 | * Copyright (C) 2011 Richard Weinberger <richrd@nod.at> | |
548f0a4e RW |
4 | */ |
5 | ||
6 | #include <linux/mm.h> | |
27795673 | 7 | #include <asm/elf.h> |
548f0a4e RW |
8 | |
9 | static struct vm_area_struct gate_vma; | |
10 | ||
11 | static int __init gate_vma_init(void) | |
12 | { | |
13 | if (!FIXADDR_USER_START) | |
14 | return 0; | |
15 | ||
2c4541e2 | 16 | vma_init(&gate_vma, NULL); |
548f0a4e RW |
17 | gate_vma.vm_start = FIXADDR_USER_START; |
18 | gate_vma.vm_end = FIXADDR_USER_END; | |
1c71222e | 19 | vm_flags_init(&gate_vma, VM_READ | VM_MAYREAD | VM_EXEC | VM_MAYEXEC); |
91a8da02 | 20 | gate_vma.vm_page_prot = PAGE_READONLY; |
548f0a4e | 21 | |
548f0a4e RW |
22 | return 0; |
23 | } | |
24 | __initcall(gate_vma_init); | |
25 | ||
26 | struct vm_area_struct *get_gate_vma(struct mm_struct *mm) | |
27 | { | |
28 | return FIXADDR_USER_START ? &gate_vma : NULL; | |
29 | } | |
30 | ||
31 | int 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 | ||
42 | int 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 | } |