lkml.org 
[lkml]   [2019]   [Sep]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH STABLE 4.9] x86, mm, gup: prevent get_page() race with munmap in paravirt guest
From
Date
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.
>

\
 
 \ /
  Last update: 2019-09-23 10:48    [W:0.048 / U:0.984 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site