[lkml]   [2017]   [Dec]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [patch 05/16] mm: Allow special mappings with user access cleared
On Wed, Dec 13, 2017 at 10:08 AM, Linus Torvalds
<> wrote:
> On Wed, Dec 13, 2017 at 7:54 AM, Peter Zijlstra <> wrote:
>> Which is why get_user_pages() _should_ enforce this.
>> What use are protection keys if you can trivially circumvent them?
> No, we will *not* worry about protection keys in get_user_pages().

Hmm. If I goof some pointer and pass that bogus pointer to read(2),
and I'm using pkey to protect my mmapped database, I think i'd rather
that read(2) fail. Sure, pkey is trivially circumventable using
wrpkru or mprotect, but those are obvious dangerous functions.

 \ /
  Last update: 2017-12-13 19:32    [W:0.111 / U:2.064 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site