From: Kees Cook <keescook@chromium.org>
To: Casey Schaufler <casey@schaufler-ca.com>
Cc: paul@paul-moore.com, linux-security-module@vger.kernel.org,
jmorris@namei.org, john.johansen@canonical.com,
penguin-kernel@i-love.sakura.ne.jp,
stephen.smalley.work@gmail.com, linux-kernel@vger.kernel.org,
linux-api@vger.kernel.org, mic@digikod.net
Subject: Re: [PATCH v9 02/11] LSM: Maintain a table of LSM attribute data
Date: Fri, 21 Apr 2023 12:20:22 -0700 [thread overview]
Message-ID: <6442e1f7.620a0220.b44ce.7a42@mx.google.com> (raw)
In-Reply-To: <20230421174259.2458-3-casey@schaufler-ca.com>
On Fri, Apr 21, 2023 at 10:42:50AM -0700, Casey Schaufler wrote:
> As LSMs are registered add their lsm_id pointers to a table.
> This will be used later for attribute reporting.
>
> Determine the number of possible security modules based on
> their respective CONFIG options. This allows the number to be
> known at build time. This allows data structures and tables
> to use the constant.
>
> Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Nit below...
> [...]
> @@ -513,6 +531,15 @@ void __init security_add_hooks(struct security_hook_list *hooks, int count,
> {
> int i;
>
> + if (lsm_active_cnt >= LSM_COUNT)
> + panic("%s Too many LSMs registered.\n", __func__);
> + /*
> + * A security module may call security_add_hooks() more
> + * than once. Landlock is one such case.
> + */
> + if (lsm_active_cnt == 0 || lsm_idlist[lsm_active_cnt - 1] != lsmid)
> + lsm_idlist[lsm_active_cnt++] = lsmid;
> +
I find this logic hard to parse. I think this might be better, since
lsm_idlist will be entirely initialized to LSM_UNDEF, yes?
/*
* A security module may call security_add_hooks() more
* than once during initialization, and LSM initialization
* is serialized. Landlock is one such case.
*/
if (lsm_idlist[lsm_active_cnt] != lsmid)
lsm_idlist[lsm_active_cnt++] = lsmid;
--
Kees Cook
next prev parent reply other threads:[~2023-04-21 19:20 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20230421174259.2458-1-casey.ref@schaufler-ca.com>
2023-04-21 17:42 ` [PATCH v9 00/11] LSM: Three basic syscalls Casey Schaufler
2023-04-21 17:42 ` [PATCH v9 01/11] LSM: Identify modules by more than name Casey Schaufler
2023-04-21 19:14 ` Kees Cook
2023-04-21 17:42 ` [PATCH v9 02/11] LSM: Maintain a table of LSM attribute data Casey Schaufler
2023-04-21 19:20 ` Kees Cook [this message]
2023-04-27 15:31 ` Casey Schaufler
2023-04-23 8:04 ` kernel test robot
2023-04-21 17:42 ` [PATCH v9 03/11] proc: Use lsmids instead of lsm names for attrs Casey Schaufler
2023-04-21 19:21 ` Kees Cook
2023-04-21 17:42 ` [PATCH v9 04/11] LSM: syscalls for current process attributes Casey Schaufler
2023-04-21 19:36 ` Kees Cook
2023-04-26 1:12 ` Casey Schaufler
2023-04-22 13:12 ` kernel test robot
2023-04-22 16:59 ` kernel test robot
2023-04-21 17:42 ` [PATCH v9 05/11] LSM: Create lsm_list_modules system call Casey Schaufler
2023-04-21 19:38 ` Kees Cook
2023-04-21 17:42 ` [PATCH v9 06/11] LSM: wireup Linux Security Module syscalls Casey Schaufler
2023-04-21 19:38 ` Kees Cook
2023-04-21 17:42 ` [PATCH v9 07/11] LSM: Helpers for attribute names and filling an lsm_ctx Casey Schaufler
2023-04-21 19:46 ` Kees Cook
2023-04-21 17:42 ` [PATCH v9 08/11] Smack: implement setselfattr and getselfattr hooks Casey Schaufler
2023-04-21 19:49 ` Kees Cook
2023-04-21 17:42 ` [PATCH v9 09/11] AppArmor: Add selfattr hooks Casey Schaufler
2023-04-21 19:54 ` Kees Cook
2023-04-22 1:23 ` kernel test robot
2023-04-22 14:55 ` kernel test robot
2023-04-21 17:42 ` [PATCH v9 10/11] SELinux: " Casey Schaufler
2023-04-21 19:57 ` Kees Cook
2023-04-21 17:42 ` [PATCH v9 11/11] LSM: selftests for Linux Security Module syscalls Casey Schaufler
2023-04-21 20:01 ` Kees Cook
2023-04-27 16:00 ` Casey Schaufler
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