projects / mirror_ubuntu-eoan-kernel.git / blame
| 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; | |
| 19 | gate_vma.vm_flags = VM_READ | VM_MAYREAD | VM_EXEC | VM_MAYEXEC; | |
| 20 | gate_vma.vm_page_prot = __P101; | |
| 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 | } |