linux-kernel - Re: [PATCH] smack: SMACK_MAGIC to include/uapi/linux/magic.h

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Date:	Thu, 08 Nov 2012 09:40:05 -0800
From:	Casey Schaufler <casey@...aufler-ca.com>
To:	Eric Paris <eparis@...isplace.org>
CC:	Jarkko Sakkinen <jarkko.sakkinen@....fi>,
	James Morris <james.l.morris@...cle.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	LSM List <linux-security-module@...r.kernel.org>,
	Casey Schaufler <casey@...aufler-ca.com>
Subject: Re: [PATCH] smack: SMACK_MAGIC to include/uapi/linux/magic.h

On 11/8/2012 7:04 AM, Eric Paris wrote:
> Then it only works by accident that magic.h is included by some random
> path in smackfs.c.  You really should be including it in smack.h (or
> each .c file individually, up to casey)

I should think it should go in smack.h

> On Thu, Nov 8, 2012 at 5:43 AM, Jarkko Sakkinen <jarkko.sakkinen@....fi> wrote:
>> On Tue, Nov 6, 2012 at 11:59 PM, Casey Schaufler <casey@...aufler-ca.com> wrote:
>>> On 11/6/2012 12:17 AM, Jarkko Sakkinen wrote:
>>>> SMACK_MAGIC moved to a proper place for easy user space access
>>>> (i.e. libsmack).
>>>>
>>>> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@....fi>
>>>> ---
>>>>  include/uapi/linux/magic.h |    1 +
>>>>  security/smack/smack.h     |    5 -----
>>>>  2 files changed, 1 insertion(+), 5 deletions(-)
>>> Will security/smack/smack_lsm.c and security/smack/smackfs.c
>>> compile after this change?
>> Sorry I haven't replied earlier. Anyway, I made a sanity check.
>>
>> I retried build from clean. Works. I also checked that vmlinux contains
>> SMACK symbols. It does.
>>
>>>> diff --git a/include/uapi/linux/magic.h b/include/uapi/linux/magic.h
>>>> index e15192c..12735ad 100644
>>>> --- a/include/uapi/linux/magic.h
>>>> +++ b/include/uapi/linux/magic.h
>>>> @@ -11,6 +11,7 @@
>>>>  #define DEBUGFS_MAGIC          0x64626720
>>>>  #define SECURITYFS_MAGIC     0x73636673
>>>>  #define SELINUX_MAGIC                0xf97cff8c
>>>> +#define SMACK_MAGIC          0x43415d53      /* "SMAC" */
>>>>  #define RAMFS_MAGIC          0x858458f6      /* some random number */
>>>>  #define TMPFS_MAGIC          0x01021994
>>>>  #define HUGETLBFS_MAGIC      0x958458f6      /* some random number */
>>>> diff --git a/security/smack/smack.h b/security/smack/smack.h
>>>> index 99b3612..8ad3095 100644
>>>> --- a/security/smack/smack.h
>>>> +++ b/security/smack/smack.h
>>>> @@ -149,11 +149,6 @@ struct smack_known {
>>>>  #define SMACK_CIPSO_SOCKET   1
>>>>
>>>>  /*
>>>> - * smackfs magic number
>>>> - */
>>>> -#define SMACK_MAGIC  0x43415d53 /* "SMAC" */
>>>> -
>>>> -/*
>>>>   * CIPSO defaults.
>>>>   */
>>>>  #define SMACK_CIPSO_DOI_DEFAULT              3       /* Historical */
>> /Jarkko
>> --
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