linux-kernel - Re: [PATCH v1 7/8] LSM: Create lsm_module

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Date:   Wed, 26 Oct 2022 08:02:01 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Casey Schaufler <casey@...aufler-ca.com>
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
Subject: Re: [PATCH v1 7/8] LSM: Create lsm_module_list system call

On Tue, Oct 25, 2022 at 11:45:18AM -0700, Casey Schaufler wrote:
> Create a system call to report the list of Linux Security Modules
> that are active on the system. The list is provided as an array
> of LSM ID numbers.
> 
> The calling application can use this list determine what LSM
> specific actions it might take. That might include chosing an
> output format, determining required privilege or bypassing
> security module specific behavior.
> 
> Signed-off-by: Casey Schaufler <casey@...aufler-ca.com>
> ---
>  include/linux/syscalls.h |  1 +
>  kernel/sys_ni.c          |  1 +
>  security/lsm_syscalls.c  | 38 ++++++++++++++++++++++++++++++++++++++
>  3 files changed, 40 insertions(+)
> 
> diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
> index 2d9033e9e5a0..02bb82142e24 100644
> --- a/include/linux/syscalls.h
> +++ b/include/linux/syscalls.h
> @@ -1058,6 +1058,7 @@ asmlinkage long sys_set_mempolicy_home_node(unsigned long start, unsigned long l
>  					    unsigned long home_node,
>  					    unsigned long flags);
>  asmlinkage long sys_lsm_self_attr(struct lsm_ctx *ctx, size_t *size, int flags);
> +asmlinkage long sys_lsm_module_list(unsigned int *ids, size_t *size, int flags);

Instead of "unsigned int", how about "u64" to make it portable
properly?

thanks,

greg k-h