[lkml]   [2016]   [Jul]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH 2/2] proc: Add /proc/<pid>/timerslack_ns interface
On Thu, Jul 14, 2016 at 5:48 AM, Serge E. Hallyn <> wrote:
> Quoting Kees Cook (
>> I think the original CAP_SYS_NICE should be fine. A malicious
>> CAP_SYS_NICE process can do plenty of insane things, I don't feel like
>> the timer slack adds to any realistic risks.
> Can someone give a detailed explanation of what you could do with
> the new timerslack feature and compare it to what you can do with
> sys_nice?

Looking at the man page for CAP_SYS_NICE, it looks like such a task
can set a task as SCHED_FIFO, so they could fork some spinning
processes and set them all SCHED_FIFO 99, in effect delaying all other
tasks for an infinite amount of time.

So one might argue setting large timerslack vlaues isn't that
different risk wise?


 \ /
  Last update: 2016-07-14 19:01    [W:0.071 / U:0.732 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site