linux-kernel - Re: [PATCH] kernel: auditfilter: looping issue, memory leak if has 2 or more AUDIT

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Date:	Wed, 10 Apr 2013 18:28:18 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Al Viro <viro@...iv.linux.org.uk>, eparis@...hat.com
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kernel: auditfilter: looping issue, memory leak if has
 2 or more AUDIT_FILTERKEYs


  also for function audit_list:
    when call audit_make_reply fails (will return NULL).
    we need free all its related variables instead of only kfree rull.
      (such as call autit_free_rule)

  please help check, thanks.

  :-)

gchen.

On 2013年04月10日 18:18, Chen Gang wrote:
> 
> 
> in another function: audit_data_to_entry:
> 
>   a. has the same issue for case AUDIT_WATCH.
> 
>   b. has an new issue for AUDIT_DIR:
>        after AUDIT_DIR succeed, it will set rule->tree.
>        next, the other case fail, then will call audit_free_rule.
>        but audit_free_rule will not free rule->tree.
> 
> 
>   I find them only by reading code, not test them.
>   and I also do not know about the related features.
>   so please help check my 2 opinions whether are correct.
> 
> 
>   welcome any suggestion or completions.
> 
>   thanks.
> 
>   :-)
> 
> 
> gchen.
> 
> 
> On 2013年04月10日 17:52, Chen Gang wrote:
>>
>>   in the 'fcount' looping,
>>     if 'new->fields[*].type" has 2 or more AUDIT_FILTERKEYs
>>     need judge new->filterkey whether has value, or memory leak.
>>
>> Signed-off-by: Chen Gang <gang.chen@...anux.com>
>> ---
>>  kernel/auditfilter.c |    2 ++
>>  1 files changed, 2 insertions(+), 0 deletions(-)
>>
>> diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
>> index f9fc54b..936ac79 100644
>> --- a/kernel/auditfilter.c
>> +++ b/kernel/auditfilter.c
>> @@ -859,6 +859,8 @@ struct audit_entry *audit_dupe_rule(struct audit_krule *old)
>>  						       &old->fields[i]);
>>  			break;
>>  		case AUDIT_FILTERKEY:
>> +			if (new->filterkey)
>> +				break;
>>  			fk = kstrdup(old->filterkey, GFP_KERNEL);
>>  			if (unlikely(!fk))
>>  				err = -ENOMEM;
>>
> 
> 


-- 
Chen Gang

Asianux Corporation
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