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50 lines
994 B
50 lines
994 B
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2011 Richard Weinberger <[email protected]> |
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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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gate_vma.vm_flags = VM_READ | VM_MAYREAD | VM_EXEC | VM_MAYEXEC; |
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gate_vma.vm_page_prot = __P101; |
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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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