netdev - Re: [PATCH v2] bonding: fix race condition in bonding_store_slaves

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:	Thu, 29 Nov 2012 09:37:56 -0800
From:	Jay Vosburgh <fubar@...ibm.com>
To:	Nikolay Aleksandrov <nikolay@...hat.com>
cc:	netdev@...r.kernel.org, andy@...yhouse.net, davem@...emloft.net
Subject: Re: [PATCH v2] bonding: fix race condition in bonding_store_slaves_active

Nikolay Aleksandrov <nikolay@...hat.com> wrote:

> Race between bonding_store_slaves_active() and slave manipulation 
> functions. The bond_for_each_slave use in bonding_store_slaves_active()
> is not protected by any synchronization mechanism.
> NULL pointer dereference is easy to reach.
> Fixed by acquiring the bond->lock for the slave walk.
>
> v2: Make description text < 75 columns
>
>Signed-off-by: Nikolay Aleksandrov <nikolay@...hat.com>

Signed-off-by: Jay Vosburgh <fubar@...ibm.com>

>---
> drivers/net/bonding/bond_sysfs.c | 2 ++
> 1 file changed, 2 insertions(+)
>
>diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
>index ef8d2a0..ba4f95b 100644
>--- a/drivers/net/bonding/bond_sysfs.c
>+++ b/drivers/net/bonding/bond_sysfs.c
>@@ -1582,6 +1582,7 @@ static ssize_t bonding_store_slaves_active(struct device *d,
> 		goto out;
> 	}
>
>+	read_lock(&bond->lock);
> 	bond_for_each_slave(bond, slave, i) {
> 		if (!bond_is_active_slave(slave)) {
> 			if (new_value)
>@@ -1590,6 +1591,7 @@ static ssize_t bonding_store_slaves_active(struct device *d,
> 				slave->inactive = 1;
> 		}
> 	}
>+	read_unlock(&bond->lock);
> out:
> 	return ret;
> }
>-- 
>1.7.11.7
>

--
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