lkml.org 
[lkml]   [2011]   [Nov]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [RFC][PATCH 0/3] fork: Add the ability to create tasks with given pids
Date
Hello Tejun,

On Tuesday 22 November 2011 15:33:26, Tejun Heo wrote:
> Hello,
>
> On Tue, Nov 22, 2011 at 12:04:38PM +0000, Pedro Alves wrote:
> > This whole userspace C/R stuff and being able to set the child's pid has potential
> > of being very useful for GDB too, allowing a much better reimplementation of its
> > old checkpointing feature [*], and allowing for a faster reverse debugging
> > implementation, by being able to do faster rewinding -- restore snapshot and replay
> > instructions up to N (by single stepping or running to breakpoint), rather than
> > manually undoing the effects of each instruction, one by one.
> >
> > IOW, root only would be a shame from GDB's perspective.
>
> Would CAP_CHECKPOINT be a shame too?

I think CAP_CHECKPOINT (or something through some LSM) would be
definitely better.

> I'm reluctant about priviledge
> through fd inheritance mostly because of its unusualness. I don't
> think priv management is a good problem space for small creative
> solutions. We're much better off with mundane mechanisms which people
> are already familiar with and is easy to account for.

fd inheritance wouldn't work for gdb; a user spawned gdb
wouldn't inherit an open fd to kernel.ns_last_pid from anywhere.

--
Pedro Alves


\
 
 \ /
  Last update: 2011-11-23 17:23    [W:0.064 / U:0.428 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site