netdev - Re: [stable] [PATCH] ipv6: track device renames in snmp6

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 for Android: free password hash cracker in your pocket

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

Date:	Fri, 27 Apr 2007 11:17:57 -0700
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Greg KH <greg@...ah.com>
Cc:	???????????? <yoshfuji@...ux-ipv6.org>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	stable@...nel.org
Subject: Re: [stable] [PATCH] ipv6: track device renames in snmp6

That patch I sent was against 2.6.21, but both 2.6.20 and 2.6.21 have
the problem.  Here is a version for 2.6.20.
=============================================

When network device's are renamed, the IPV6 snmp6 code
gets confused. It doesn't track name changes so it will OOPS
when network device's are removed.

The fix is trivial, just unregister/re-register in notify handler.

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


---
 net/ipv6/addrconf.c |    6 ++++--
 net/ipv6/proc.c     |    1 +
 2 files changed, 5 insertions(+), 2 deletions(-)

--- linux-2.6.20.y.orig/net/ipv6/addrconf.c	2007-04-27 11:14:51.000000000 -0700
+++ linux-2.6.20.y/net/ipv6/addrconf.c	2007-04-27 11:16:26.000000000 -0700
@@ -2338,8 +2338,9 @@ static int addrconf_notify(struct notifi
 		break;
 
 	case NETDEV_CHANGENAME:
-#ifdef CONFIG_SYSCTL
 		if (idev) {
+			snmp6_unregister_dev(idev);
+#ifdef CONFIG_SYSCTL
 			addrconf_sysctl_unregister(&idev->cnf);
 			neigh_sysctl_unregister(idev->nd_parms);
 			neigh_sysctl_register(dev, idev->nd_parms,
@@ -2347,8 +2348,9 @@ static int addrconf_notify(struct notifi
 					      &ndisc_ifinfo_sysctl_change,
 					      NULL);
 			addrconf_sysctl_register(idev, &idev->cnf);
-		}
 #endif
+			snmp6_register_dev(idev);
+		}
 		break;
 	};
 
--- linux-2.6.20.y.orig/net/ipv6/proc.c	2007-02-23 15:34:07.000000000 -0800
+++ linux-2.6.20.y/net/ipv6/proc.c	2007-04-27 11:16:26.000000000 -0700
@@ -237,6 +237,7 @@ int snmp6_unregister_dev(struct inet6_de
 		return -EINVAL;
 	remove_proc_entry(idev->stats.proc_dir_entry->name,
 			  proc_net_devsnmp6);
+	idev->stats.proc_dir_entry = NULL;
 	return 0;
 }
 
-
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