netdev - [PATCH net] ipv4: fix ifa_flags reuse problem in using ifconfig tool

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

Date:   Wed, 4 Sep 2019 15:37:47 +0800
From:   Su Yanjun <suyj.fnst@...fujitsu.com>
To:     <davem@...emloft.net>, <kuznet@....inr.ac.ru>,
        <yoshfuji@...ux-ipv6.org>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <suyj.fnst@...fujitsu.com>
Subject: [PATCH net] ipv4: fix ifa_flags reuse problem in using ifconfig tool

When NetworkManager has already set ipv4 address then uses
ifconfig set another ipv4 address. It will use previous ifa_flags
that will cause device route not be inserted.

As NetworkManager has already support IFA_F_NOPREFIXROUTE flag [1],
but ifconfig will reuse the ifa_flags. It's weird especially
some old scripts or program [2]  still  use ifconfig.

[1] https://gitlab.freedesktop.org/NetworkManager/NetworkManager/
commit/fec80e7473ad16979af75ed299d68103e7aa3fe9

[2] LTP or TAHI

Signed-off-by: Su Yanjun <suyj.fnst@...fujitsu.com>
---
 net/ipv4/devinet.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index a4b5bd4..56ca339 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -1159,6 +1159,7 @@ int devinet_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr)
 			inet_del_ifa(in_dev, ifap, 0);
 			ifa->ifa_broadcast = 0;
 			ifa->ifa_scope = 0;
+			ifa->ifa_flags = 0;
 		}
 
 		ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
-- 
2.7.4