iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

mm: replace mmap with vma write lock assertions when operating on a vma

Browse Source 
Vma write lock assertion always includes mmap write lock assertion and
additional vma lock checks when per-VMA locks are enabled. Replace
weaker mmap_assert_write_locked() assertions with stronger
vma_assert_write_locked() ones when we are operating on a vma which
is expected to be locked.

Link: https://lkml.kernel.org/r/20230804152724.3090321-4-surenb@google.com
Suggested-by: Jann Horn <jannh@google.com>
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Linus Torvalds <torvalds@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Suren Baghdasaryan 2023-08-04 08:27:21 -07:00 committed by Andrew Morton
parent ce2fc5fffd
commit e727bfd5e7
2 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
mm/hugetlb.c
View File

@ -5029,7 +5029,7 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
src_vma->vm_start,
src_vma->vm_end);
mmu_notifier_invalidate_range_start(&range);
mmap_assert_write_locked(src);
vma_assert_write_locked(src_vma);
raw_write_seqcount_begin(&src->write_protect_seq);
} else {
/*

2
mm/memory.c
View File

@ -1312,7 +1312,7 @@ copy_page_range(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma)
* Use the raw variant of the seqcount_t write API to avoid
* lockdep complaining about preemptibility.
*/
mmap_assert_write_locked(src_mm);
vma_assert_write_locked(src_vma);
raw_write_seqcount_begin(&src_mm->write_protect_seq);
}