linux-kernel - Re: [PATCH] avc: remove unnecessary pointer reassignment

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Message-ID: <CAHC9VhRwTvimSHLToG9mkk5jiM7N3CJCR6pR2Sa_mJsHcDwtog@mail.gmail.com>
Date:	Wed, 4 Mar 2015 13:07:27 -0500
From:	Paul Moore <paul@...l-moore.com>
To:	Stephen Smalley <sds@...ho.nsa.gov>
Cc:	Jeff Vander Stoep <jeffv@...gle.com>, jvanderstoep@...il.com,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	James Morris <james.l.morris@...cle.com>,
	selinux@...ho.nsa.gov, Eric Paris <eparis@...isplace.org>
Subject: Re: [PATCH] avc: remove unnecessary pointer reassignment

On Fri, Feb 27, 2015 at 8:15 AM, Stephen Smalley <sds@...ho.nsa.gov> wrote:
> On 02/26/2015 04:54 PM, Jeff Vander Stoep wrote:
>> Commit f01e1af445fa ("selinux: don't pass in NULL avd to avc_has_perm_noaudit")
>> made this pointer reassignment unnecessary. Avd should continue to reference
>> the stack-based copy.
>>
>> Signed-off-by: Jeff Vander Stoep <jeffv@...gle.com>
>
> Acked-by:  Stephen Smalley <sds@...ho.nsa.gov>


Thanks everyone for the patch and the review.  I'll merge this next
week into selinux#next.

>> ---
>>  security/selinux/avc.c | 6 ++----
>>  1 file changed, 2 insertions(+), 4 deletions(-)
>>
>> diff --git a/security/selinux/avc.c b/security/selinux/avc.c
>> index afcc0ae..3c17dda 100644
>> --- a/security/selinux/avc.c
>> +++ b/security/selinux/avc.c
>> @@ -724,12 +724,10 @@ inline int avc_has_perm_noaudit(u32 ssid, u32 tsid,
>>       rcu_read_lock();
>>
>>       node = avc_lookup(ssid, tsid, tclass);
>> -     if (unlikely(!node)) {
>> +     if (unlikely(!node))
>>               node = avc_compute_av(ssid, tsid, tclass, avd);
>> -     } else {
>> +     else
>>               memcpy(avd, &node->ae.avd, sizeof(*avd));
>> -             avd = &node->ae.avd;
>> -     }
>>
>>       denied = requested & ~(avd->allowed);
>>       if (unlikely(denied))
>>
>



-- 
paul moore
www.paul-moore.com
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