netdev - Bug handling devices with weird names

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:	Thu, 8 Jul 2010 19:08:07 +0200
From:	Martín Ferrari <martin.ferrari@...il.com>
To:	netdev <netdev@...r.kernel.org>
Cc:	Mathieu Lacage <mathieu.lacage@...hia.inria.fr>
Subject: Bug handling devices with weird names

According to dev_valid_name (net/core/dev.c), a valid device name is
one that doesn't include spaces, slashes, and is not "." or "..". But
if I create a device called "foo:", some operations fail:

# ip link add name foo: type dummy
# ip link list foo:
155: foo:: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN ioctl(SIOCGIFXQLEN)
failed: No such device

    link/ether 92:7f:4d:0d:8f:57 brd ff:ff:ff:ff:ff:ff

Strace reveals that the problem occurs when executing an ioctl:

ioctl(4, SIOCGIFTXQLEN, {ifr_name="foo:", ???}) = -1 ENODEV (No such device)

ifconfig gets completely lost, of course:

$ /sbin/ifconfig foo:
foo:: error fetching interface information: Device not found

ioctl(5, SIOCGIFFLAGS, {ifr_name="foo:", ???}) = -1 ENODEV (No such device)


So, is this fixable or iproute should stop using the ioctl interface?
(dunno if netlink provides everything already)

-- 
Martín Ferrari
--
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