[lkml]   [2017]   [Dec]   [12]   [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 Tue, Dec 12, 2017 at 9:32 AM, Thomas Gleixner <> wrote:
> From: Peter Zijstra <>
> In order to create VMAs that are not accessible to userspace create a new
> VM_NOUSER flag. This can be used in conjunction with
> install_special_mapping() to inject 'kernel' data into the userspace map.
> Similar to how arch_vm_get_page_prot() allows adding _PAGE_flags to
> pgprot_t, introduce arch_vm_get_page_prot_excl() which masks
> _PAGE_flags from pgprot_t and use this to implement VM_NOUSER for x86.

How does this interact with get_user_pages(), etc?

 \ /
  Last update: 2017-12-12 19:01    [W:0.203 / U:3.508 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site