lkml.org 
[lkml]   [2012]   [Aug]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH] Forbid invocation of kexec_load() outside initial PID namespace
From
On Fri, Aug 3, 2012 at 12:53 PM, Daniel P. Berrange <berrange@redhat.com> wrote:
> From: "Daniel P. Berrange" <berrange@redhat.com>
>
> The following commit
>
> commit cf3f89214ef6a33fad60856bc5ffd7bb2fc4709b
> Author: Daniel Lezcano <daniel.lezcano@free.fr>
> Date: Wed Mar 28 14:42:51 2012 -0700
>
> pidns: add reboot_pid_ns() to handle the reboot syscall
>
> introduced custom handling of the reboot() syscall when invoked
> from a non-initial PID namespace. The intent was that a process
> in a container can be allowed to keep CAP_SYS_BOOT and execute
> reboot() to shutdown/reboot just their private container, rather
> than the host.
>
> Unfortunately the kexec_load() syscall also relies on the
> CAP_SYS_BOOT capability. So by allowing a container to keep
> this capability to safely invoke reboot(), they mistakenly
> also gain the ability to use kexec_load(). The solution is
> to make kexec_load() return -EPERM if invoked from a PID
> namespace that is not the initial namespace
>
> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
> Cc: Serge Hallyn <serge.hallyn@canonical.com>
> Cc: Daniel Lezcano <daniel.lezcano@free.fr>
> Cc: Michael Kerrisk <mtk.manpages@gmail.com>
> Cc: "Eric W. Biederman" <ebiederm@xmission.com>
> Cc: Tejun Heo <tj@kernel.org>
> Cc: Oleg Nesterov <oleg@redhat.com>

Why is this commit not marked for -stable?

--
Thanks,
//richard


\
 
 \ /
  Last update: 2012-08-03 14:01    [W:0.203 / U:0.040 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site