"Michael Kerrisk (man-pages)" <mtk.manpages@xxxxxxxxx> writes:
> Li,
>
> Regarding your commit 923c7538236564c46ee80c253a416705321f13e3 , I
> plan to apply the following patch to the reboot(2) manual page. Does
> it look okay to you?
You have documented the behavior as of 3.4.
The change in 3.9 is to allow that same behavior in a pid_namespace
created with a user namespace. Aka in 3.9 the permission
check changed from capable(CAP_SYS_BOOT) to ns_capable(pid_ns->user_ns, CAP_SYS_BOOT);
Eric
> Thanks,
>
> Michael
>
> diff --git a/man2/reboot.2 b/man2/reboot.2
> index 8347870..1c17b85 100644
> --- a/man2/reboot.2
> +++ b/man2/reboot.2
> @@ -24,7 +24,7 @@
> .\" Modified, 27 May 2004, Michael Kerrisk <mtk.manpages@xxxxxxxxx>
> .\" Added notes on capability requirements
> .\"
> -.TH REBOOT 2 2010-10-31 "Linux" "Linux Programmer's Manual"
> +.TH REBOOT 2 2013-03-12 "Linux" "Linux Programmer's Manual"
> .SH NAME
> reboot \- reboot or enable/disable Ctrl-Alt-Del
> .SH SYNOPSIS
> @@ -147,6 +147,26 @@ For the i386 architecture, the additional
> argument does not do
> anything at present (2.1.122), but the type of reboot can be
> determined by kernel command-line arguments ("reboot=...") to be
> either warm or cold, and either hard or through the BIOS.
> +.SS Behavior inside PID namespaces
> +.\" commit commit 923c7538236564c46ee80c253a416705321f13e3
> +Since Linux 3.9, when
^^^ 3.4
> +.BR reboot ()
> +is called from a PID namespace (see
> +.BR pid_namespaces (7))
> +other than the initial PID namespace,
> +the effect of the call is to send a signal to the namespace "init" process.
> +.BR LINUX_REBOOT_CMD_RESTART
> +and
> +.BR LINUX_REBOOT_CMD_RESTART2
> +cause a
> +.BR SIGHUP
> +signal to be sent.
> +.BR LINUX_REBOOT_CMD_POWER_OFF
> +and
> +.BR LINUX_REBOOT_CMD_HALT
> +cause a
> +.B SIGINT
> +signal to be sent.
> .SH RETURN VALUE
> For the values of
> .I cmd
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