linux-kernel - Re: [PATCH v3 5/5] firmware: fix fw cache to avoid usermode helper on suspend

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

Date:   Fri, 2 Sep 2016 20:13:06 +0200
From:   "Luis R. Rodriguez" <mcgrof@...nel.org>
To:     Daniel Wagner <wagi@...om.org>
Cc:     mcgrof@...nel.org, ming.lei@...onical.com,
        akpm@...ux-foundation.org, gregkh@...uxfoundation.org,
        daniel.wagner@...-carit.de, mmarek@...e.com,
        linux-kernel@...r.kernel.org, markivx@...eaurora.org,
        stephen.boyd@...aro.org, zohar@...ux.vnet.ibm.com,
        broonie@...nel.org, tiwai@...e.de, johannes@...solutions.net,
        chunkeey@...glemail.com, hauke@...ke-m.de,
        jwboyer@...oraproject.org, dmitry.torokhov@...il.com,
        dwmw2@...radead.org, jslaby@...e.com,
        torvalds@...ux-foundation.org, luto@...capital.net,
        fengguang.wu@...el.com, rpurdie@...ys.net,
        j.anaszewski@...sung.com, Abhay_Salunke@...l.com,
        Julia.Lawall@...6.fr, Gilles.Muller@...6.fr, nicolas.palix@...g.fr,
        teg@...m.no, dhowells@...hat.com, bjorn.andersson@...aro.org,
        arend.vanspriel@...adcom.com, kvalo@...eaurora.org
Subject: Re: [PATCH v3 5/5] firmware: fix fw cache to avoid usermode helper
 on suspend

On Wed, Aug 31, 2016 at 09:03:53AM +0200, Daniel Wagner wrote:
> Hi Luis,
> 
> On 08/24/2016 02:45 AM, mcgrof@...nel.org wrote:
> >diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
> >index 22d1760a4278..dca4f9cbf4db 100644
> >--- a/drivers/base/firmware_class.c
> >+++ b/drivers/base/firmware_class.c
> >@@ -1412,7 +1412,7 @@ static int cache_firmware(const char *fw_name)
> >
> > 	pr_debug("%s: %s\n", __func__, fw_name);
> >
> >-	ret = request_firmware(&fw, fw_name, NULL);
> >+	ret = request_firmware_direct(&fw, fw_name, NULL);
> > 	if (!ret)
> > 		kfree(fw);
> >
> >
> 
> While you are at it you should kill this here as well:
> 
> @@ -1622,7 +1637,6 @@ static void __device_uncache_fw_images(void)
>  static void device_cache_fw_images(void)
>  {
>  	struct firmware_cache *fwc = &fw_cache;
> -	int old_timeout;
>  	DEFINE_WAIT(wait);
> 
>  	pr_debug("%s\n", __func__);
> @@ -1630,17 +1644,6 @@ static void device_cache_fw_images(void)
>  	/* cancel uncache work */
>  	cancel_delayed_work_sync(&fwc->work);
> 
> -	/*
> -	 * use small loading timeout for caching devices' firmware
> -	 * because all these firmware images have been loaded
> -	 * successfully at lease once, also system is ready for
> -	 * completing firmware loading now. The maximum size of
> -	 * firmware in current distributions is about 2M bytes,
> -	 * so 10 secs should be enough.
> -	 */
> -	old_timeout = loading_timeout;
> -	loading_timeout = 10;
> -
>  	mutex_lock(&fw_lock);
>  	fwc->state = FW_LOADER_START_CACHE;
>  	dpm_for_each_dev(NULL, dev_cache_fw_image);
> @@ -1648,8 +1651,6 @@ static void device_cache_fw_images(void)
> 
>  	/* wait for completion of caching firmware for all devices */
>  	async_synchronize_full_domain(&fw_cache_domain);
> -
> -	loading_timeout = old_timeout;

You're right, thanks!

  Luis