vma.c (40b88644dd92d99e572063893c2a247598c238d6) vma.c (df2a7df9a9aa32c3df227de346693e6e802c8591)
1// SPDX-License-Identifier: GPL-2.0-or-later
2
3/*
4 * VMA-specific functions.
5 */
6
7#include "vma_internal.h"
8#include "vma.h"

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707 /*
708 * Make sure that map_count on return from munmap() will
709 * not exceed its limit; but let map_count go just above
710 * its limit temporarily, to help free resources as expected.
711 */
712 if (end < vma->vm_end && mm->map_count >= sysctl_max_map_count)
713 goto map_count_exceeded;
714
1// SPDX-License-Identifier: GPL-2.0-or-later
2
3/*
4 * VMA-specific functions.
5 */
6
7#include "vma_internal.h"
8#include "vma.h"

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707 /*
708 * Make sure that map_count on return from munmap() will
709 * not exceed its limit; but let map_count go just above
710 * its limit temporarily, to help free resources as expected.
711 */
712 if (end < vma->vm_end && mm->map_count >= sysctl_max_map_count)
713 goto map_count_exceeded;
714
715 /* Don't bother splitting the VMA if we can't unmap it anyway */
716 if (!can_modify_vma(vma)) {
717 error = -EPERM;
718 goto start_split_failed;
719 }
720
715 error = __split_vma(vmi, vma, start, 1);
716 if (error)
717 goto start_split_failed;
718 }
719
720 /*
721 * Detach a range of VMAs from the mm. Using next as a temp variable as
722 * it is always overwritten.
723 */
724 next = vma;
725 do {
721 error = __split_vma(vmi, vma, start, 1);
722 if (error)
723 goto start_split_failed;
724 }
725
726 /*
727 * Detach a range of VMAs from the mm. Using next as a temp variable as
728 * it is always overwritten.
729 */
730 next = vma;
731 do {
732 if (!can_modify_vma(next)) {
733 error = -EPERM;
734 goto modify_vma_failed;
735 }
736
726 /* Does it split the end? */
727 if (next->vm_end > end) {
728 error = __split_vma(vmi, next, end, 0);
729 if (error)
730 goto end_split_failed;
731 }
732 vma_start_write(next);
733 mas_set(&mas_detach, count);

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810 remove_mt(mm, &mas_detach);
811 validate_mm(mm);
812 if (unlock)
813 mmap_read_unlock(mm);
814
815 __mt_destroy(&mt_detach);
816 return 0;
817
737 /* Does it split the end? */
738 if (next->vm_end > end) {
739 error = __split_vma(vmi, next, end, 0);
740 if (error)
741 goto end_split_failed;
742 }
743 vma_start_write(next);
744 mas_set(&mas_detach, count);

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821 remove_mt(mm, &mas_detach);
822 validate_mm(mm);
823 if (unlock)
824 mmap_read_unlock(mm);
825
826 __mt_destroy(&mt_detach);
827 return 0;
828
829modify_vma_failed:
818clear_tree_failed:
819userfaultfd_error:
820munmap_gather_failed:
821end_split_failed:
822 mas_set(&mas_detach, 0);
823 mas_for_each(&mas_detach, next, end)
824 vma_mark_detached(next, false);
825

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855
856 if ((offset_in_page(start)) || start > TASK_SIZE || len > TASK_SIZE-start)
857 return -EINVAL;
858
859 end = start + PAGE_ALIGN(len);
860 if (end == start)
861 return -EINVAL;
862
830clear_tree_failed:
831userfaultfd_error:
832munmap_gather_failed:
833end_split_failed:
834 mas_set(&mas_detach, 0);
835 mas_for_each(&mas_detach, next, end)
836 vma_mark_detached(next, false);
837

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867
868 if ((offset_in_page(start)) || start > TASK_SIZE || len > TASK_SIZE-start)
869 return -EINVAL;
870
871 end = start + PAGE_ALIGN(len);
872 if (end == start)
873 return -EINVAL;
874
863 /*
864 * Check if memory is sealed, prevent unmapping a sealed VMA.
865 * can_modify_mm assumes we have acquired the lock on MM.
866 */
867 if (unlikely(!can_modify_mm(mm, start, end)))
868 return -EPERM;
869
870 /* Find the first overlapping VMA */
871 vma = vma_find(vmi, end);
872 if (!vma) {
873 if (unlock)
874 mmap_write_unlock(mm);
875 return 0;
876 }
877

--- 885 unchanged lines hidden --- 		875 /* Find the first overlapping VMA */
876 vma = vma_find(vmi, end);
877 if (!vma) {
878 if (unlock)
879 mmap_write_unlock(mm);
880 return 0;
881 }
882

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