linux-kernel - Re: [PATCH 1/1][v2] Add reboot_pid

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Message-Id: <201112041558.pB4Fw1tn002287@xs8.xs4all.nl>
Date:	Sun, 4 Dec 2011 16:58:01 +0100
From:	"Miquel van Smoorenburg" <mikevs@...all.net>
To:	daniel.lezcano@...e.fr
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1][v2] Add reboot_pid_ns to handle the reboot syscall

In article <xs4all.1322956280-13831-2-git-send-email-daniel.lezcano@...e.fr> you write:
>This patch propose to store the reboot value in the 16 upper bits of the
>exit code from the processes belonging to a pid namespace which has
>rebooted. When the reboot syscall is called and we are not in the initial
>pid namespace, we kill the pid namespace.

Should there be a way to find out if the reboot systemcall is
containerized or not (other than comparing kernel versions once
this is mainlined) ?

For example, a tool like lxc-start might want to disable CAP_SYS_REBOOT
if the reboot system call is not containerized.

Perhaps a LINUX_REBOOT_CMD_ISCONTAINER (or ISVIRTUAL, whatever,
bikeshed away) should be added that simply returns 0 if sys_reboot
is containerized. It would return -EINVAL as it does today if it's not.

Thoughts ?

Mike.
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