Messages in this thread Patch in this message | | | Date | Mon, 29 Aug 2022 21:25:10 +0000 | Subject | [RFC PATCH 07/28] kernel/fork: mark VMAs as locked before copying pages during fork | From | Suren Baghdasaryan <> |
| |
Protect VMAs from concurrent page fault handler while performing copy_page_range for VMAs having VM_WIPEONFORK flag set.
Signed-off-by: Suren Baghdasaryan <surenb@google.com> --- kernel/fork.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/kernel/fork.c b/kernel/fork.c index bfab31ecd11e..1872ad549fed 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -709,8 +709,10 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm, rb_parent = &tmp->vm_rb; mm->map_count++; - if (!(tmp->vm_flags & VM_WIPEONFORK)) + if (!(tmp->vm_flags & VM_WIPEONFORK)) { + vma_mark_locked(mpnt); retval = copy_page_range(tmp, mpnt); + } if (tmp->vm_ops && tmp->vm_ops->open) tmp->vm_ops->open(tmp); -- 2.37.2.672.g94769d06f0-goog
| |