netdev - Bridge vlan malfunctions for vid greater than 63

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:	Tue, 20 Aug 2013 17:07:40 +0900
From:	Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
To:	"David S. Miller" <davem@...emloft.net>,
	Vlad Yasevich <vyasevic@...hat.com>, netdev@...r.kernel.org
Cc:	Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
Subject: Bridge vlan malfunctions for vid greater than 63

Hello.

Bridge vlan behaves unexpectedly for certain vids.
These are examples on Fedora 19 x86_64:
- "bridge vlan show" command cannot retrieve vids greater than 63,
  even if patch 3e805ad (using ifinfomsg instead of rtgenmsg) is
  applied.
- When we delete a vid, if no configured vid less than 64 remains,
  vlan_info will be freed prematurely, which could delete other
  configured vids.
- Parmanent fdb entries could not be deleted even if corresponding vid
  is deleted.

I'm afraid that some bitmap functions are given the number of elements
in a bitmap array (BR_VLAN_BITMAP_LEN), which is less than the bit
length.

Example:
static int br_fill_ifinfo(struct sk_buff *skb,
...
		if (!pv || bitmap_empty(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN))

As BR_VLAN_BITMAP_LEN is "BITS_TO_LONGS(VLAN_N_VID)", I tested after
changing BR_VLAN_BITMAP_LEN to VLAN_N_VID, and confirmed that this
resolves that malfunctions.

The following mail contains the patch described above.
Please comment if I misunderstood something.

Thanks,
Toshiaki Makita

--
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