Prior to Linux 2.6.35, net devices outside the initial net namespace
did not have sysfs directories. Attempting to add attributes to
them will trigger a BUG().
Reported-and-tested-by: Russell Stuart <russell-deb...@stuart.id.au>
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
This applies to 2.6.32 *only*. It has not been applied upstream since
the limitation no longer exists.
Dave, please ack or nak this for stable.
Ben.
drivers/net/tun.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 4fdfa2a..0f77aca 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1006,7 +1006,8 @@ static int tun_set_iff(struct net *net, struct file
*file, struct ifreq *ifr)
if (err < 0)
goto err_free_sk;
- if (device_create_file(&tun->dev->dev, &dev_attr_tun_flags) ||
+ if (!net_eq(dev_net(tun->dev), &init_net) ||
+ device_create_file(&tun->dev->dev, &dev_attr_tun_flags) ||
device_create_file(&tun->dev->dev, &dev_attr_owner) ||
device_create_file(&tun->dev->dev, &dev_attr_group))
printk(KERN_ERR "Failed to create tun sysfs files\n");
--
1.7.1
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