lkml.org 
[lkml]   [2020]   [Aug]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH RESEND] fs: Move @f_count to different cacheline with @f_mode
On 2020-08-26, Shaokun Zhang <zhangshaokun@hisilicon.com> wrote:
> 在 2020/8/22 0:02, Will Deacon 写道:
> > - This thing is tagged with __randomize_layout, so it doesn't help anybody
> > using that crazy plugin
>
> This patch isolated the @f_count with @f_mode absolutely and we don't care the
> base address of the structure, or I may miss something what you said.

__randomize_layout randomises the order of fields in a structure on each
kernel rebuild (to make attacks against sensitive kernel structures
theoretically harder because the offset of a field is per-build). It is
separate to ASLR or other base-related randomisation. However it depends
on having CONFIG_GCC_PLUGIN_RANDSTRUCT=y and I believe (at least for
distribution kernels) this isn't a widely-used configuration.

--
Aleksa Sarai
Senior Software Engineer (Containers)
SUSE Linux GmbH
<https://www.cyphar.com/>
[unhandled content-type:application/pgp-signature]
\
 
 \ /
  Last update: 2020-08-26 10:25    [W:0.053 / U:0.228 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site