linux-kernel - Re: [PATCH v1 4/8] LSM: Maintain a table of LSM attribute data

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Message-ID: <e3949b66-26fe-807e-a626-79ca78396e8a@schaufler-ca.com>
Date:   Wed, 26 Oct 2022 17:38:21 -0700
From:   Casey Schaufler <casey@...aufler-ca.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     casey.schaufler@...el.com, paul@...l-moore.com,
        linux-security-module@...r.kernel.org, jmorris@...ei.org,
        keescook@...omium.org, john.johansen@...onical.com,
        penguin-kernel@...ove.sakura.ne.jp, stephen.smalley.work@...il.com,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        mic@...ikod.net, casey@...aufler-ca.com
Subject: Re: [PATCH v1 4/8] LSM: Maintain a table of LSM attribute data

On 10/25/2022 11:00 PM, Greg KH wrote:
> On Tue, Oct 25, 2022 at 11:45:15AM -0700, Casey Schaufler wrote:
>> As LSMs are registered add their lsm_id pointers to a table.
>> This will be used later for attribute reporting.
>>
>> Signed-off-by: Casey Schaufler <casey@...aufler-ca.com>
>> ---
>>  include/linux/security.h | 17 +++++++++++++++++
>>  security/security.c      | 18 ++++++++++++++++++
>>  2 files changed, 35 insertions(+)
>>
>> diff --git a/include/linux/security.h b/include/linux/security.h
>> index ca1b7109c0db..e1678594d983 100644
>> --- a/include/linux/security.h
>> +++ b/include/linux/security.h
>> @@ -138,6 +138,23 @@ enum lockdown_reason {
>>  
>>  extern const char *const lockdown_reasons[LOCKDOWN_CONFIDENTIALITY_MAX+1];
>>  
>> +#define LSMID_ENTRIES ( \
>> +	1 + /* capabilities */ \
> No #define for capabilities?

Nope. There isn't one. CONFIG_SECURITY takes care of it.

>> +	(IS_ENABLED(CONFIG_SECURITY_SELINUX) ? 1 : 0) + \
>> +	(IS_ENABLED(CONFIG_SECURITY_SMACK) ? 1 : 0) + \
>> +	(IS_ENABLED(CONFIG_SECURITY_TOMOYO) ? 1 : 0) + \
>> +	(IS_ENABLED(CONFIG_SECURITY_IMA) ? 1 : 0) + \
>> +	(IS_ENABLED(CONFIG_SECURITY_APPARMOR) ? 1 : 0) + \
>> +	(IS_ENABLED(CONFIG_SECURITY_YAMA) ? 1 : 0) + \
>> +	(IS_ENABLED(CONFIG_SECURITY_LOADPIN) ? 1 : 0) + \
>> +	(IS_ENABLED(CONFIG_SECURITY_SAFESETID) ? 1 : 0) + \
>> +	(IS_ENABLED(CONFIG_SECURITY_LOCKDOWN) ? 1 : 0) + \
>> +	(IS_ENABLED(CONFIG_BPF_LSM) ? 1 : 0) + \
>> +	(IS_ENABLED(CONFIG_SECURITY_LANDLOCK) ? 1 : 0))
>> +
>> +extern int lsm_id;
> u64?

u32. I doubt we'll get more than 32K security modules.

>
> thanks,
>
> greg k-h