netdev - [PATCH] bridge: sysfs locking fix.

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:	Tue, 14 Aug 2007 14:50:52 +0100
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Lennert Buytenhek <buytenh@...tstofly.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	bridge@...ux-foundation.org
Subject: [PATCH] bridge: sysfs locking fix.

Forget earlier patch, it is wrong...

The stp change code generates "sleeping function called from invalid context"
because rtnl_lock() called with BH disabled. This fixes it by not acquiring then
dropping the bridge lock.

Signed-off-by: Stephen Hemminger <shemminger@...ux-foundation.org>

--- a/net/bridge/br_sysfs_br.c	2007-08-06 09:26:48.000000000 +0100
+++ b/net/bridge/br_sysfs_br.c	2007-08-14 14:29:52.000000000 +0100
@@ -147,20 +147,26 @@ static ssize_t show_stp_state(struct dev
 	return sprintf(buf, "%d\n", br->stp_enabled);
 }
 
-static void set_stp_state(struct net_bridge *br, unsigned long val)
-{
-	rtnl_lock();
-	spin_unlock_bh(&br->lock);
-	br_stp_set_enabled(br, val);
-	spin_lock_bh(&br->lock);
-	rtnl_unlock();
-}
 
 static ssize_t store_stp_state(struct device *d,
 			       struct device_attribute *attr, const char *buf,
 			       size_t len)
 {
-	return store_bridge_parm(d, buf, len, set_stp_state);
+	struct net_bridge *br = to_bridge(d);
+	char *endp;
+	unsigned long val;
+
+	if (!capable(CAP_NET_ADMIN))
+		return -EPERM;
+
+	val = simple_strtoul(buf, &endp, 0);
+	if (endp == buf)
+		return -EINVAL;
+
+	rtnl_lock();
+	br_stp_set_enabled(br, val);
+	rtnl_unlock();
+
 }
 static DEVICE_ATTR(stp_state, S_IRUGO | S_IWUSR, show_stp_state,
 		   store_stp_state);
-
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