netdev - Re: [PATCH] net: tipc: fix possible infoleak in tipc_mon

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Date:   Tue, 28 Jun 2022 16:21:17 +0800
From:   Hangyu Hua <hbh25y@...il.com>
To:     Tung Quang Nguyen <tung.q.nguyen@...tech.com.au>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "tipc-discussion@...ts.sourceforge.net" 
        <tipc-discussion@...ts.sourceforge.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jmaloy@...hat.com" <jmaloy@...hat.com>,
        "ying.xue@...driver.com" <ying.xue@...driver.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>
Subject: Re: [PATCH] net: tipc: fix possible infoleak in tipc_mon_rcv()

On 2022/6/28 11:35, Tung Quang Nguyen wrote:
>> -----Original Message-----
>> From: Hangyu Hua <hbh25y@...il.com>
>> Sent: Tuesday, June 28, 2022 9:59 AM
>> To: jmaloy@...hat.com; ying.xue@...driver.com; davem@...emloft.net; edumazet@...gle.com; kuba@...nel.org;
>> pabeni@...hat.com
>> Cc: netdev@...r.kernel.org; tipc-discussion@...ts.sourceforge.net; linux-kernel@...r.kernel.org; Hangyu Hua <hbh25y@...il.com>
>> Subject: [PATCH] net: tipc: fix possible infoleak in tipc_mon_rcv()
>> 
>> dom_bef is use to cache current domain record only if current domain
>> exists. But when current domain does not exist, dom_bef will still be used
>> in mon_identify_lost_members. This may lead to an information leak.
>> 
>> Fix this by adding a memset before using dom_bef.
>> 
>> Fixes: 35c55c9877f8 ("tipc: add neighbor monitoring framework")
>> Signed-off-by: Hangyu Hua <hbh25y@...il.com <mailto:hbh25y@...il.com>>
>> ---
>>  net/tipc/monitor.c | 1 +
>>  1 file changed, 1 insertion(+)
>> 
>> diff --git a/net/tipc/monitor.c b/net/tipc/monitor.c
>> index 2f4d23238a7e..67084e5aa15c 100644
>> --- a/net/tipc/monitor.c
>> +++ b/net/tipc/monitor.c
>> @@ -534,6 +534,7 @@ void tipc_mon_rcv(struct net *net, void *data, u16 dlen, u32 addr,
>>        state->peer_gen = new_gen;
>> 
>>        /* Cache current domain record for later use */
>> +     memset(&dom_bef, 0, sizeof(dom_bef));
>>        dom_bef.member_cnt = 0;
> Please remove /dom_bef.member_cnt = 0;/ if memset() is used instead.

I get it. I will send a v2.

Thanks,
Hangyu

>>        dom = peer->domain;
>>        if (dom)
>> --
>> 2.25.1