diff options
| author | Willem de Bruijn <willemb@google.com> | 2015-01-15 13:18:40 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-02-26 17:50:10 -0800 |
| commit | ada98740b7198b58cd7882c49dfbd4d3047b911e (patch) | |
| tree | 8f66f4d0bbe3ff328f2509ff91594b72a4ff48be /net | |
| parent | a74f1d1204a5c892466b52ac68ee6443c1e459d7 (diff) | |
| download | lwn-ada98740b7198b58cd7882c49dfbd4d3047b911e.tar.gz lwn-ada98740b7198b58cd7882c49dfbd4d3047b911e.zip | |
ip: zero sockaddr returned on error queue
[ Upstream commit f812116b174e59a350acc8e4856213a166a91222 ]
The sockaddr is returned in IP(V6)_RECVERR as part of errhdr. That
structure is defined and allocated on the stack as
struct {
struct sock_extended_err ee;
struct sockaddr_in(6) offender;
} errhdr;
The second part is only initialized for certain SO_EE_ORIGIN values.
Always initialize it completely.
An MTU exceeded error on a SOCK_RAW/IPPROTO_RAW is one example that
would return uninitialized bytes.
Signed-off-by: Willem de Bruijn <willemb@google.com>
----
Also verified that there is no padding between errhdr.ee and
errhdr.offender that could leak additional kernel data.
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/ip_sockglue.c | 8 | ||||
| -rw-r--r-- | net/ipv6/datagram.c | 10 |
2 files changed, 5 insertions, 13 deletions
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c index 580dd96666e0..135045e0e125 100644 --- a/net/ipv4/ip_sockglue.c +++ b/net/ipv4/ip_sockglue.c @@ -426,15 +426,11 @@ int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); sin = &errhdr.offender; - sin->sin_family = AF_UNSPEC; + memset(sin, 0, sizeof(*sin)); if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) { - struct inet_sock *inet = inet_sk(sk); - sin->sin_family = AF_INET; sin->sin_addr.s_addr = ip_hdr(skb)->saddr; - sin->sin_port = 0; - memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); - if (inet->cmsg_flags) + if (inet_sk(sk)->cmsg_flags) ip_cmsg_recv(msg, skb); } diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c index c3bf2d2e519e..841cfa2c4600 100644 --- a/net/ipv6/datagram.c +++ b/net/ipv6/datagram.c @@ -382,11 +382,10 @@ int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); sin = &errhdr.offender; - sin->sin6_family = AF_UNSPEC; + memset(sin, 0, sizeof(*sin)); + if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) { sin->sin6_family = AF_INET6; - sin->sin6_flowinfo = 0; - sin->sin6_port = 0; if (np->rxopt.all) ip6_datagram_recv_common_ctl(sk, msg, skb); if (skb->protocol == htons(ETH_P_IPV6)) { @@ -397,12 +396,9 @@ int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) ipv6_iface_scope_id(&sin->sin6_addr, IP6CB(skb)->iif); } else { - struct inet_sock *inet = inet_sk(sk); - ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, &sin->sin6_addr); - sin->sin6_scope_id = 0; - if (inet->cmsg_flags) + if (inet_sk(sk)->cmsg_flags) ip_cmsg_recv(msg, skb); } } |