linux-kernel - Re: [PATCH] kernel/groups.c: consider about NULL for 'group

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Date:	Wed, 25 Sep 2013 08:49:31 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Tejun Heo <tj@...nel.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Michael Kerrisk <mtk.manpages@...il.com>
Subject: Re: [PATCH] kernel/groups.c: consider about NULL for 'group_info'
 in all related extern functions

On 09/24/2013 08:04 PM, Tejun Heo wrote:
> On Tue, Sep 24, 2013 at 12:27:36PM +0800, Chen Gang wrote:
>> For real world, /sbin/init will call setgroups, so user space 'help'
>> kernel itself to protect this issue, but I think, we don't only depend
>> on the user space help checking.
>>
>> The proof is below:
>>
>>   [root@...enlinux tmp]# grep setgroups /sbin/*
>>   Binary file /sbin/init matches
>>   Binary file /sbin/rpc.statd matches
>>   Binary file /sbin/rsyslogd matches
>>   Binary file /sbin/runuser matches
>>
>> From reading kernel source code, kernel itself does not intend to set
>> 'group_info', it is triggered by user space or another kernel mode
>> sub-systems.
> 
> Can you please demonstrate such failure?  You can tell kernel to
> execute a given binary instead of init with "init=" param.
> 

OK, I will/should try, today (although I have to spend my additional
time resource on it. :-( ).

Hmm... in fact, in my opinion, interface (especially content system
call) need make itself consistency, although at present, it can not
cause issue.

> Thanks.
> 

Thanks.
-- 
Chen Gang
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