linux-kernel - Re: [PATCH v5 3/6] mm/memfd: add MFD_NOEXEC_SEAL and MFD

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Message-ID: <Y49oIR6/ULTqlcwL@kroah.com>
Date:   Tue, 6 Dec 2022 17:04:49 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     jeffxu@...omium.org
Cc:     skhan@...uxfoundation.org, keescook@...omium.org,
        akpm@...ux-foundation.org, dmitry.torokhov@...il.com,
        dverkamp@...omium.org, hughd@...gle.com, jeffxu@...gle.com,
        jorgelo@...omium.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-mm@...ck.org,
        jannh@...gle.com, linux-hardening@...r.kernel.org,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v5 3/6] mm/memfd: add MFD_NOEXEC_SEAL and MFD_EXEC

On Tue, Dec 06, 2022 at 03:23:55PM +0000, jeffxu@...omium.org wrote:
> --- a/kernel/pid_namespace.c
> +++ b/kernel/pid_namespace.c
> @@ -110,6 +110,11 @@ static struct pid_namespace *create_pid_namespace(struct user_namespace *user_ns
>  	ns->ucounts = ucounts;
>  	ns->pid_allocated = PIDNS_ADDING;
>  
> +#if defined(CONFIG_SYSCTL) && defined(CONFIG_MEMFD_CREATE)
> +	ns->memfd_noexec_scope =
> +		task_active_pid_ns(current)->memfd_noexec_scope;
> +#endif

.c files should never have #if in them.  Can't you put this in a .h file
properly so that this does not get really messy over time?



> +
>  	return ns;
>  
>  out_free_idr:
> @@ -255,6 +260,45 @@ void zap_pid_ns_processes(struct pid_namespace *pid_ns)
>  	return;
>  }
>  
> +#if defined(CONFIG_SYSCTL) && defined(CONFIG_MEMFD_CREATE)

Same here.

thanks,

greg k-h