linux-kernel - Re: [PATCH v14 3/6] LSM: Explicit individual LSM associations

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Date:	Mon, 29 Jul 2013 18:48:21 -0700
From:	Casey Schaufler <casey@...aufler-ca.com>
To:	Kees Cook <keescook@...omium.org>
CC:	LKLM <linux-kernel@...r.kernel.org>,
	LSM <linux-security-module@...r.kernel.org>,
	SE Linux <selinux@...ho.nsa.gov>,
	James Morris <jmorris@...ei.org>,
	John Johansen <john.johansen@...onical.com>,
	Eric Paris <eparis@...hat.com>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	Casey Schaufler <casey@...aufler-ca.com>
Subject: Re: [PATCH v14 3/6] LSM: Explicit individual LSM associations

On 7/29/2013 1:51 PM, Kees Cook wrote:
> On Thu, Jul 25, 2013 at 11:32 AM, Casey Schaufler
> <casey@...aufler-ca.com> wrote:
>> Subject: [PATCH v14 3/6] LSM: Explicit individual LSM associations
>> [...]
>> Introduce feature specific security operation vectors
>> for NetLabel, XFRM, secmark and presentation in the
>> traditional /proc/.../attr interfaces. This allows
>> proper handling of secids.
>> [...]
>> --- a/include/linux/lsm.h
>> +++ b/include/linux/lsm.h
>> @@ -164,9 +164,18 @@ static inline void lsm_init_secid(struct secids *secid, u32 lsecid, int order)
>>  {
>>         memset(secid, 0, sizeof(*secid));
>>
>> -       if (lsecid != 0)
>> +       if (lsecid == 0)
>> +               return;
>> +       /*
>> +        * An order of -1 means set it for all LSMs.
>> +        */
>> +       if (order < 0) {
>> +               secid->si_lsm[0] = lsecid;
>> +               secid->si_count++;
>> +       } else {
>> +               secid->si_lsm[order] = lsecid;
>>                 secid->si_count = 1;
>> -       secid->si_lsm[order] = lsecid;
>> +       }
>>  }
>>
>>  static inline int lsm_zero_secid(struct secids *secid)
>> @@ -178,39 +187,64 @@ static inline int lsm_zero_secid(struct secids *secid)
>>
>>  #ifdef CONFIG_SECURITY
>>
>> +extern struct security_operations *present_ops;
>>  static inline struct security_operations *lsm_present_ops(void)
>>  {
>> -       return security_ops;
>> +       return present_ops;
>>  }
>>
>>  static inline int lsm_present_order(void)
>>  {
>> -       return 0;
>> +       return present_ops->order;
>>  }
>>
>> +#ifdef CONFIG_NETLABEL
>> +extern struct security_operations *netlbl_ops;
>> +
>>  static inline struct security_operations *lsm_netlbl_ops(void)
>>  {
>> -       return security_ops;
>> +       return netlbl_ops;
>>  }
>>
>>  static inline int lsm_netlbl_order(void)
>>  {
>> -       return 0;
>> +       return netlbl_ops->order;
>>  }
>> +#endif /* CONFIG_NETLABEL */
>> +
>> +#ifdef CONFIG_SECURITY_NETWORK_XFRM
>> +extern struct security_operations *xfrm_ops;
>>
>>  static inline struct security_operations *lsm_xfrm_ops(void)
>>  {
>> -       return security_ops;
>> +       return xfrm_ops;
>>  }
>>
>>  static inline int lsm_xfrm_order(void)
>>  {
>> -       return 0;
>> +       return xfrm_ops->order;
>>  }
>> +#endif /* CONFIG_SECURITY_NETWORK_XFRM */
>> +
>> +#ifdef CONFIG_NETWORK_SECMARK
>> +extern struct security_operations *secmark_ops;
>>
>>  static inline struct security_operations *lsm_secmark_ops(void)
>>  {
>> -       return security_ops;
>> +       return secmark_ops;
>> +}
>> +
>> +static inline int lsm_secmark_order(void)
>> +{
>> +       return secmark_ops->order;
>> +}
>> +#endif /* CONFIG_NETWORK_SECMARK */
>> +
>> +#else /* CONFIG_SECURITY */
>> +
>> +static inline int lsm_xfrm_order(void)
>> +{
>> +       return 0;
>>  }
>>
>>  static inline int lsm_secmark_order(void)
>> @@ -218,6 +252,11 @@ static inline int lsm_secmark_order(void)
>>         return 0;
>>  }
>>
>> +static inline struct security_operations *lsm_secmark_ops(void)
>> +{
>> +       return NULL;
>> +}
>> +
>>  #endif /* CONFIG_SECURITY */
>>
>>  #endif /* ! _LINUX_LSM_H */
> Something went wrong here with the #ifdef/#else stuff here. I built
> without CONFIG_SECURITY_NETWORK_XFRM and it fails, missing
> lsm_xfrm_order().
>
> If I added an #else to the CONFIG_SECURITY_NETWORK_XFRM check and made
> lsm_xfrm_order() return 0 there too, it built fine.

Yup, I missed that configuration iteration at the end.
I've incorporated a fix.

>
> -Kees
>

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