vma.c (002c6ca75289a4ac4f6738213dd2d258704886e4) vma.c (8032bf1233a74627ce69b803608e650f3f35971c)
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Set up the VMAs to tell the VM about the vDSO.
4 * Copyright 2007 Andi Kleen, SUSE Labs.
5 */
6
7/*
8 * Copyright (c) 2017 Oracle and/or its affiliates. All rights reserved.

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349struct linux_binprm;
350
351/* Shuffle the vdso up a bit, randomly. */
352static unsigned long vdso_addr(unsigned long start, unsigned int len)
353{
354 unsigned int offset;
355
356 /* This loses some more bits than a modulo, but is cheaper */
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Set up the VMAs to tell the VM about the vDSO.
4 * Copyright 2007 Andi Kleen, SUSE Labs.
5 */
6
7/*
8 * Copyright (c) 2017 Oracle and/or its affiliates. All rights reserved.

--- 340 unchanged lines hidden (view full) ---

349struct linux_binprm;
350
351/* Shuffle the vdso up a bit, randomly. */
352static unsigned long vdso_addr(unsigned long start, unsigned int len)
353{
354 unsigned int offset;
355
356 /* This loses some more bits than a modulo, but is cheaper */
357 offset = prandom_u32_max(PTRS_PER_PTE);
357 offset = get_random_u32_below(PTRS_PER_PTE);
358 return start + (offset << PAGE_SHIFT);
359}
360
361static int map_vdso(const struct vdso_image *image,
362 struct vm_special_mapping *vdso_mapping)
363{
364 struct mm_struct *mm = current->mm;
365 struct vm_area_struct *vma;

--- 92 unchanged lines hidden --- 		358 return start + (offset << PAGE_SHIFT);
359}
360
361static int map_vdso(const struct vdso_image *image,
362 struct vm_special_mapping *vdso_mapping)
363{
364 struct mm_struct *mm = current->mm;
365 struct vm_area_struct *vma;

--- 92 unchanged lines hidden ---