cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mem_32.c (994B)

      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	gate_vma.vm_flags = VM_READ | VM_MAYREAD | VM_EXEC | VM_MAYEXEC;
     20	gate_vma.vm_page_prot = __P101;
     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}