netdev - Re: [PATCH v2 net] bonding: prevent out of bound accesses

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Message-ID: <57753027.7040006@cumulusnetworks.com>
Date:	Thu, 30 Jun 2016 16:43:51 +0200
From:	Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:	Eric Dumazet <eric.dumazet@...il.com>,
	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>,
	Mahesh Bandewar <maheshb@...gle.com>,
	Nikolay Aleksandrov <nikolay@...hat.com>,
	Ding Tianhong <dingtianhong@...wei.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Jay Vosburgh <j.vosburgh@...il.com>,
	Veaceslav Falico <vfalico@...il.com>,
	Andy Gospodarek <gospo@...ulusnetworks.com>
Subject: Re: [PATCH v2 net] bonding: prevent out of bound accesses

On 30/06/16 16:13, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@...gle.com>
> 
> ether_addr_equal_64bits() requires some care about its arguments,
> namely that 8 bytes might be read, even if last 2 byte values are not
> used.
> 
> KASan detected a violation with null_mac_addr and lacpdu_mcast_addr
> in bond_3ad.c
> 
> Same problem with mac_bcast[] and mac_v6_allmcast[] in bond_alb.c :
> Although the 8-byte alignment was there, KASan would detect out
> of bound accesses.
> 
> Fixes: 815117adaf5b ("bonding: use ether_addr_equal_unaligned for bond addr compare")
> Fixes: bb54e58929f3 ("bonding: Verify RX LACPDU has proper dest mac-addr")
> Fixes: 885a136c52a8 ("bonding: use compare_ether_addr_64bits() in ALB")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: Dmitry Vyukov <dvyukov@...gle.com>
> ---
>  drivers/net/bonding/bond_3ad.c |   11 +++++++----
>  drivers/net/bonding/bond_alb.c |    7 ++-----
>  include/net/bonding.h          |    7 ++++++-
>  3 files changed, 15 insertions(+), 10 deletions(-)
> 

+CC bonding maintainers

For v2,
Acked-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>