Messages in this thread | | | From | Andrey Konovalov <> | Date | Wed, 2 May 2018 19:25:17 +0200 | Subject | Re: [PATCH 4/6] mm, arm64: untag user addresses in mm/gup.c |
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On Wed, May 2, 2018 at 5:36 PM, Kirill A. Shutemov <kirill.shutemov@linux.intel.com> wrote: > On Wed, May 02, 2018 at 02:38:42PM +0000, Andrey Konovalov wrote: >> > Does having a tagged address here makes any difference? I couldn't hit a >> > failure with my simple tests (LD_PRELOAD a library that randomly adds >> > tags to pointers returned by malloc). >> >> I think you're right, follow_page_mask is only called from >> __get_user_pages, which already untagged the address. I'll remove >> untagging here. > > It also called from follow_page(). Have you covered all its callers?
Oh, missed that, will take a look.
Thinking about that, would it make sense to add untagging to find_vma (and others) instead of trying to cover all find_vma callers?
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