linux-kernel - Re: [PATCH 2/2] module: wait when loading a module which is currently initializing.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Mon, 17 Sep 2012 14:37:23 -0300
From:	Lucas De Marchi <lucas.demarchi@...fusion.mobi>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Jon Masters <jonathan@...masters.org>,
	linux-modules <linux-modules@...r.kernel.org>,
	Lucas De Marchi <lucas.de.marchi@...il.com>
Subject: Re: [PATCH 2/2] module: wait when loading a module which is currently initializing.

On Mon, Sep 17, 2012 at 1:36 AM, Rusty Russell <rusty@...tcorp.com.au> wrote:
> Lucas De Marchi <lucas.demarchi@...fusion.mobi> writes:
>>> -       if (find_module(mod->name)) {
>>> +       if ((old = find_module(mod->name)) != NULL) {
>>> +               if (old->state == MODULE_STATE_COMING) {
>>> +                       /* Wait in case it fails to load. */
>>> +                       mutex_unlock(&module_mutex);
>>> +                       err = wait_event_interruptible(module_wq,
>>> +                                              finished_loading(mod->name));
>>> +                       if (err)
>>> +                               goto free_arch_cleanup;
>>> +                       goto again;
>>
>> I wonder if we should indeed retry in case the module failed to load
>> or if we should just skip straight to returning the error code. We
>> don't have the return code for the failed load, but maybe we can
>> fabricate one here.
>>
>> Thoughts?
>
> Could have different cmdline parameters, or other randomness like
> out-of-memory.  I think this is safest.

makes sense. Ack.

Lucas De Marchi
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/