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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2011-06-06 22:42:06 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-06-06 22:42:06 -0700 |
| commit | 13fcb7bd322164c67926ffe272846d4860196dc6 (patch) | |
| tree | aa7727f84e4ce2a2b1cf758e03d176c62354f44b /net/packet/af_packet.c | |
| parent | 79b3891587741dfac72cdfead1f2764b56a567b0 (diff) | |
| download | lwn-13fcb7bd322164c67926ffe272846d4860196dc6.tar.gz lwn-13fcb7bd322164c67926ffe272846d4860196dc6.zip | |
af_packet: prevent information leak
In 2.6.27, commit 393e52e33c6c2 (packet: deliver VLAN TCI to userspace)
added a small information leak.
Add padding field and make sure its zeroed before copy to user.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
CC: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/packet/af_packet.c')
| -rw-r--r-- | net/packet/af_packet.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index ba248d93399a..c0c3cda19712 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -804,6 +804,7 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, } else { h.h2->tp_vlan_tci = 0; } + h.h2->tp_padding = 0; hdrlen = sizeof(*h.h2); break; default: @@ -1736,6 +1737,7 @@ static int packet_recvmsg(struct kiocb *iocb, struct socket *sock, } else { aux.tp_vlan_tci = 0; } + aux.tp_padding = 0; put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux); } |