Messages in this thread | | | Subject | Re: [PATCH STABLE 4.9] x86, mm, gup: prevent get_page() race with munmap in paravirt guest | From | Ben Hutchings <> | Date | Thu, 19 Sep 2019 19:26:41 +0100 |
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On Mon, 2019-08-19 at 18:58 +0100, Vlastimil Babka wrote: [...] > Hi, I'm sending this stable-only patch for consideration because it's probably > unrealistic to backport the 4.13 switch to generic GUP. I can look at 4.4 and > 3.16 if accepted. The RCU page table freeing could be also considered.
I would be interested in backports for 3.16 and 4.4.
> Note the patch also includes page refcount protection. I found out that > 8fde12ca79af ("mm: prevent get_user_pages() from overflowing page refcount") > backport to 4.9 missed the arch-specific gup implementations: > https://lore.kernel.org/lkml/6650323f-dbc9-f069-000b-f6b0f941a065@suse.cz/ [...]
I suppose that still needs to be addressed for 4.9, right?
Ben.
-- Ben Hutchings Quantity is no substitute for quality, but it's the only one we've got.
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