Messages in this thread | | | Subject | Re: [PATCH STABLE 4.9] x86, mm, gup: prevent get_page() race with munmap in paravirt guest | From | Vlastimil Babka <> | Date | Mon, 23 Sep 2019 10:48:04 +0200 |
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On 9/19/19 8:26 PM, Ben Hutchings wrote: > 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?
Yeah, I'll take a look, thanks for reminding.
> Ben. >
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