Date: Fri, 25 May 2012 10:23:53 -0700 From: Julian Elischer <julian@freebsd.org> To: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> Cc: FreeBSD Hackers <freebsd-hackers@freebsd.org>, FreeBSD-Jail <freebsd-jail@freebsd.org> Subject: Re: [jail] Allowing root privledged users to renice Message-ID: <4FBFC029.10401@freebsd.org> In-Reply-To: <8EE125C9-9FA7-495B-A6ED-CF3F7C2E8A3E@lists.zabbadoz.net> References: <1337964514.8951.2.camel@powernoodle-l7.corp.yahoo.com> <8EE125C9-9FA7-495B-A6ED-CF3F7C2E8A3E@lists.zabbadoz.net>
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On 5/25/12 10:04 AM, Bjoern A. Zeeb wrote:
> On 25. May 2012, at 16:48 , Sean Bruno wrote:
>
>> I've been toying with the idea of letting jails renice processes ... how
>> dangerous and/or stupid is this idea?
>>
>> ==== //depot/yahoo/ybsd_9/src/sys/kern/kern_jail.c#5 -
>> /home/seanbru/ybsd_9/src/sys/kern/kern_jail.c ====
>> 270a271,275
>> + int jail_allow_renice = 0;
>> + SYSCTL_INT(_security_jail, OID_AUTO, allow_renice, CTLFLAG_RW,
>> +&jail_allow_renice, 0,
>> + "Prison root can renice processes");
>>
>> 3857a3863,3865
>> + case PRIV_SCHED_SETPRIORITY:
>> + if (!jail_allow_renice)
>> + return (EPERM);
>
> I think sysctls are a bad idea given jails have per-jail flags these days.
>
> Maybe also only allow re-nicing to be nicer but not less nice?
^^^^ for sure ! start a jail with it's max priority and the
root within can allow nicer priorities only..
you can always add priority from teh master (parent) environment outside.
> /bz
>
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