linux-kernel - Re: [RFC PATCH v2 2/2] module: When modifying a module's text ignore modules which are going away too

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Message-ID: <874m359uv2.fsf@rustcorp.com.au>
Date:   Fri, 18 Nov 2016 16:45:29 +1030
From:   Rusty Russell <rusty@...tcorp.com.au>
To:     Aaron Tomlin <atomlin@...hat.com>, linux-kernel@...r.kernel.org
Cc:     rostedt@...dmis.org, "Jessica Yu" <jeyu@...hat.com>
Subject: Re: [RFC PATCH v2 2/2] module: When modifying a module's text ignore modules which are going away too

Aaron Tomlin <atomlin@...hat.com> writes:
> By default, during the access permission modification of a module's core
> and init pages, we only ignore modules that are malformed. Albeit for a
> module which is going away, it does not make sense to change its text to
> RO since the module should be RW, before deallocation.
>
> This patch makes set_all_modules_text_ro() skip modules which are going
> away too.
>
> Signed-off-by: Aaron Tomlin <atomlin@...hat.com>

Acked-by: Rusty Russell <rusty@...tcorp.com.au>

Thanks!
Rusty.

> ---
>  kernel/module.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/kernel/module.c b/kernel/module.c
> index ff93ab8..2a383df 100644
> --- a/kernel/module.c
> +++ b/kernel/module.c
> @@ -1969,7 +1969,8 @@ void set_all_modules_text_ro(void)
>  
>  	mutex_lock(&module_mutex);
>  	list_for_each_entry_rcu(mod, &modules, list) {
> -		if (mod->state == MODULE_STATE_UNFORMED)
> +		if (mod->state == MODULE_STATE_UNFORMED ||
> +			mod->state == MODULE_STATE_GOING)
>  			continue;
>  
>  		frob_text(&mod->core_layout, set_memory_ro);
> -- 
> 2.5.5