[lkml]   [2020]   [Feb]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] x86/pkeys: Manually set X86_FEATURE_OSPKE to preserve existing changes

On 2/27/2020 10:01 AM, Borislav Petkov wrote:
> On Wed, Feb 26, 2020 at 04:16:13PM -0800, Jacob Keller wrote:
>> I tested this and it resolves my report! Thanks for a timely fix.
> Adding your Tested-by.

Yep, thanks.

>> I agree with the analysis. Perhaps it would make sense in the long term
>> to find a solution where get_cpu_cap can remember what was cleared for
>> each CPU and restore those? It already does this using the global
>> variables...
> get_cpu_cap() remembers if you use setup_force_cpu_cap() but I agree
> that that whole feature bit handling is a bit, hm, "strange". It had its
> raisins.

Right. Nothing quite equivalent to that for per-CPU changes though.

> FWIW, we had started cleaning those up but then the security nightmares
> happened so on the backburner it went...
> Thx.

Completely understandable. Especially since changes here are tricky to
get right, this being a case in point.


 \ /
  Last update: 2020-02-27 19:20    [W:0.052 / U:1.480 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site