/* * Copyright (C) 2011 Richard Weinberger <richrd@nod.at> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/mm.h> #include <asm/elf.h> static struct vm_area_struct gate_vma; static int __init gate_vma_init(void) { if (!FIXADDR_USER_START) return 0; vma_init(&gate_vma, NULL); gate_vma.vm_start = FIXADDR_USER_START; gate_vma.vm_end = FIXADDR_USER_END; gate_vma.vm_flags = VM_READ | VM_MAYREAD | VM_EXEC | VM_MAYEXEC; gate_vma.vm_page_prot = __P101; return 0; } __initcall(gate_vma_init); struct vm_area_struct *get_gate_vma(struct mm_struct *mm) { return FIXADDR_USER_START ? &gate_vma : NULL; } int in_gate_area_no_mm(unsigned long addr) { if (!FIXADDR_USER_START) return 0; if ((addr >= FIXADDR_USER_START) && (addr < FIXADDR_USER_END)) return 1; return 0; } int in_gate_area(struct mm_struct *mm, unsigned long addr) { struct vm_area_struct *vma = get_gate_vma(mm); if (!vma) return 0; return (addr >= vma->vm_start) && (addr < vma->vm_end); }