| Date | Sun, 05 Feb 2012 23:11:10 +0100 | From | Willy Tarreau <> | Subject | [PATCH 81/91] af_packet: prevent information leak |
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2.6.27-longterm review patch. If anyone has any objections, please let us know.
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[ Upstream commit 13fcb7bd322164c67926ffe272846d4860196dc6 ]
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> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> --- include/linux/if_packet.h | 2 ++ net/packet/af_packet.c | 2 ++ 2 files changed, 4 insertions(+), 0 deletions(-)
Index: longterm-2.6.27/include/linux/if_packet.h =================================================================== --- longterm-2.6.27.orig/include/linux/if_packet.h 2012-02-05 22:34:32.515915059 +0100 +++ longterm-2.6.27/include/linux/if_packet.h 2012-02-05 22:34:46.429914864 +0100 @@ -61,6 +61,7 @@ __u16 tp_mac; __u16 tp_net; __u16 tp_vlan_tci; + __u16 tp_padding; }; struct tpacket_hdr @@ -93,6 +94,7 @@ __u32 tp_sec; __u32 tp_nsec; __u16 tp_vlan_tci; + __u16 tp_padding; }; #define TPACKET2_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket2_hdr)) + sizeof(struct sockaddr_ll)) Index: longterm-2.6.27/net/packet/af_packet.c =================================================================== --- longterm-2.6.27.orig/net/packet/af_packet.c 2012-02-05 22:34:32.520914890 +0100 +++ longterm-2.6.27/net/packet/af_packet.c 2012-02-05 22:34:46.438916430 +0100 @@ -708,6 +708,7 @@ h.h2->tp_sec = ts.tv_sec; h.h2->tp_nsec = ts.tv_nsec; h.h2->tp_vlan_tci = skb->vlan_tci; + h.h2->tp_padding = 0; hdrlen = sizeof(*h.h2); break; default: @@ -1181,6 +1182,7 @@ aux.tp_net = skb_network_offset(skb); aux.tp_vlan_tci = skb->vlan_tci; + aux.tp_padding = 0; put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux); }
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