51 lines
1007 B
C
51 lines
1007 B
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2011 Richard Weinberger <richrd@nod.at>
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*/
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#include <linux/mm.h>
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#include <asm/elf.h>
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static struct vm_area_struct gate_vma;
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static int __init gate_vma_init(void)
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{
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if (!FIXADDR_USER_START)
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return 0;
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vma_init(&gate_vma, NULL);
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gate_vma.vm_start = FIXADDR_USER_START;
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gate_vma.vm_end = FIXADDR_USER_END;
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vm_flags_init(&gate_vma, VM_READ | VM_MAYREAD | VM_EXEC | VM_MAYEXEC);
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gate_vma.vm_page_prot = PAGE_READONLY;
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return 0;
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}
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__initcall(gate_vma_init);
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struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
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{
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return FIXADDR_USER_START ? &gate_vma : NULL;
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}
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int in_gate_area_no_mm(unsigned long addr)
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{
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if (!FIXADDR_USER_START)
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return 0;
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if ((addr >= FIXADDR_USER_START) && (addr < FIXADDR_USER_END))
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return 1;
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return 0;
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}
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int in_gate_area(struct mm_struct *mm, unsigned long addr)
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{
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struct vm_area_struct *vma = get_gate_vma(mm);
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if (!vma)
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return 0;
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return (addr >= vma->vm_start) && (addr < vma->vm_end);
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}
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