linux-kernel - Re: IPv4: sysctl table check failed [was: mmotm 2010-10-07-14-08 uploaded]

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Message-ID: <20101008163015.GB5724@hack>
Date:	Sat, 9 Oct 2010 00:30:15 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Jiri Slaby <jirislaby@...il.com>, linux-kernel@...r.kernel.org,
	mm-commits@...r.kernel.org, ML netdev <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: IPv4: sysctl table check failed [was: mmotm 2010-10-07-14-08
	uploaded]

On Thu, Oct 07, 2010 at 03:28:06PM -0700, Andrew Morton wrote:
>On Fri, 08 Oct 2010 00:22:15 +0200
>Eric Dumazet <eric.dumazet@...il.com> wrote:
>
>> Le vendredi 08 octobre 2010 __ 00:06 +0200, Jiri Slaby a __crit :
>> > On 10/07/2010 11:08 PM, akpm@...ux-foundation.org wrote:
>> > > The mm-of-the-moment snapshot 2010-10-07-14-08 has been uploaded to
>> > 
>> > Hi, I got bunch of "sysctl table check failed" below. All seem to be
>> > related to ipv4:
>> 
>> I would say, sysctl check is buggy :(
>> 
>> min/max are optional
>> 
>> [PATCH] sysctl: min/max bounds are optional
>> 
>> sysctl check complains when proc_doulongvec_minmax or
>> proc_doulongvec_ms_jiffies_minmax are used by a vector of longs (with
>> more than one element), with no min or max value specified.
>> 
>> This is unexpected, given we had a bug on this min/max handling :)
>> 
>> Reported-by: Jiri Slaby <jirislaby@...il.com>
>> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
>> ---
>>  kernel/sysctl_check.c |    9 ---------
>>  1 file changed, 9 deletions(-)
>> 
>> diff --git a/kernel/sysctl_check.c b/kernel/sysctl_check.c
>> index 04cdcf7..10b90d8 100644
>> --- a/kernel/sysctl_check.c
>> +++ b/kernel/sysctl_check.c
>> @@ -143,15 +143,6 @@ int sysctl_check_table(struct nsproxy *namespaces, struct ctl_table *table)
>>  				if (!table->maxlen)
>>  					set_fail(&fail, table, "No maxlen");
>>  			}
>> -			if ((table->proc_handler == proc_doulongvec_minmax) ||
>> -			    (table->proc_handler == proc_doulongvec_ms_jiffies_minmax)) {
>> -				if (table->maxlen > sizeof (unsigned long)) {
>> -					if (!table->extra1)
>> -						set_fail(&fail, table, "No min");
>> -					if (!table->extra2)
>> -						set_fail(&fail, table, "No max");
>> -				}
>> -			}
>>  #ifdef CONFIG_PROC_SYSCTL
>>  			if (table->procname && !table->proc_handler)
>>  				set_fail(&fail, table, "No proc_handler");
>
>That will probably fix it ;)


Yeah, it looks good for me too,

Acked-by: WANG Cong <xiyou.wangcong@...il.com>

>
>net-avoid-limits-overflow.patch is dependent on this patch.  Unless
>Eric B squeaks I'll plan on sending this patch in for 2.6.37.
>

Eirc B reminded me we should check the code in sysctl_check.c,
but I forgot. The patch from Eric D is exactly what we need here.

Thanks.

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