netdev - Re: [PATCH] bonding:fix speed unknown,lacp bonding failed

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, 05 Jul 2013 01:40:42 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	wangyufen@...wei.com
Cc:	netdev@...r.kernel.org, lizefan@...wei.com,
	zhangdianfang@...wei.com
Subject: Re: [PATCH] bonding:fix speed unknown,lacp bonding failed

From: Wangyufen <wangyufen@...wei.com>
Date: Fri, 5 Jul 2013 14:32:59 +0800

> @@ -2301,8 +2301,11 @@ static int bond_miimon_inspect(struct bonding *bond)

>  		switch (slave->link) {
>  		case BOND_LINK_UP:
> -			if (link_state)
> +			if (link_state) {
> +				if (slave->speed == SPEED_UNKNOWN)
> +					bond_update_speed_duplex(slave);
>  				continue;

bond_miimon_inspect() does not hold the RTNL mutex, and it is required
that the RTNL mutex is held when bond_update_speed_duplex() is called.

If you ran this new code, you should be hitting the assertion at the
beginning of __ethtool_get_settings() which reads:

	ASSERT_RTNL();

In fact, if you look at bond_miimon_inspect()'s caller it goes:

		if (!rtnl_trylock()) {

right after calling bond_miimon_inspect().
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html