netdev - Re: Re: [Fix kernel crash in cipso_v4_sock

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Date:	Tue, 31 Mar 2015 05:09:43 +0000 (GMT)
From:	Maninder Singh <maninder1.s@...sung.com>
To:	Casey Schaufler <casey@...aufler-ca.com>,
	Paul Moore <paul@...l-moore.com>,
	Maninder Singh <maninder1.s@...sung.com>
Cc:	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Vaneet Narang <v.narang@...sung.com>,
	AJEET YADAV <ajeet.y@...sung.com>
Subject: Re: Re: [Fix kernel crash in cipso_v4_sock_delattr ]

We are currently using 3.10.58 kernel and  we are facing this issue for samck enabled system.
and as we can check in other APIs like netlbl_sock_getattr and netlbl_conn_setattr have this preventive check so we added this check for netlbl_sock_delattr also.

And regarding patch re-submission, actually we have run checkpatch.pl before submission(successfull)  But when we submit the patch our editor changes tabs into space, we will resubmitt the patch ASAP.

Maninder Singh
------- Original Message -------
Sender : Casey Schaufler<casey@...aufler-ca.com>
Date : Mar 31, 2015 02:25 (GMT+09:00)
Title : Re: [Fix kernel crash in cipso_v4_sock_delattr ]

On 3/30/2015 4:32 AM, Paul Moore wrote:
> On Monday, March 30, 2015 11:09:00 AM Maninder Singh wrote:
>> Dear All,
>> we found One Kernel Crash issue in cipso_v4_sock_delattr :-
>> As Cipso supports only inet sockets so cipso_v4_sock_delattr will crash when
>> try to access any other socket type.  cipso_v4_sock_delattr access
>> sk_inet->inet_opt which may contain not NULL but invalid address. we found
>> this issue with netlink socket.(reproducible by trinity using sendto system
>> call .) 
> Hello,
>
> First, please go read the Documentation/SubmittingPatches from the kernel 
> sources; your patch needs to be resubmitted and the instructions in that file 
> will show you how to do it correctly next time.
>
> Second, this appears to only affect Smack based systems, yes?  SELinux based 
> systems should have the proper checking in place to prevent this (the checks 
> are handled in the LSM).

This looks like a problem that was fixed some time ago.
The current Smack code clearly checks for this. What kernel
version are you testing against?

> That said, it probably wouldn't hurt to add the 
> extra checking to netlbl_sock_delattr().  If you properly resubmit your patch 
> I'll ACK it.
>
> -Paul
>