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    Subject[PATCH 3.4 13/32] inet: fix addr_len/msg->msg_namelen assignment in recv_error and rxpmtu functions
    Date
    3.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Hannes Frederic Sowa <hannes@stressinduktion.org>

    [ Upstream commit 85fbaa75037d0b6b786ff18658ddf0b4014ce2a4 ]

    Commit bceaa90240b6019ed73b49965eac7d167610be69 ("inet: prevent leakage
    of uninitialized memory to user in recv syscalls") conditionally updated
    addr_len if the msg_name is written to. The recv_error and rxpmtu
    functions relied on the recvmsg functions to set up addr_len before.

    As this does not happen any more we have to pass addr_len to those
    functions as well and set it to the size of the corresponding sockaddr
    length.

    This broke traceroute and such.

    Fixes: bceaa90240b6 ("inet: prevent leakage of uninitialized memory to user in recv syscalls")
    Reported-by: Brad Spengler <spender@grsecurity.net>
    Reported-by: Tom Labanowski
    Cc: mpb <mpb.mail@gmail.com>
    Cc: David S. Miller <davem@davemloft.net>
    Cc: Eric Dumazet <eric.dumazet@gmail.com>
    Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    include/net/ip.h | 2 +-
    include/net/ipv6.h | 6 ++++--
    net/ipv4/ip_sockglue.c | 3 ++-
    net/ipv4/ping.c | 2 +-
    net/ipv4/raw.c | 2 +-
    net/ipv4/udp.c | 2 +-
    net/ipv6/datagram.c | 7 +++++--
    net/ipv6/raw.c | 4 ++--
    net/ipv6/udp.c | 4 ++--
    9 files changed, 19 insertions(+), 13 deletions(-)

    --- a/include/net/ip.h
    +++ b/include/net/ip.h
    @@ -466,7 +466,7 @@ extern int compat_ip_getsockopt(struct s
    int optname, char __user *optval, int __user *optlen);
    extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *));

    -extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len);
    +extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len);
    extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
    __be16 port, u32 info, u8 *payload);
    extern void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
    --- a/include/net/ipv6.h
    +++ b/include/net/ipv6.h
    @@ -606,8 +606,10 @@ extern int compat_ipv6_getsockopt(stru
    extern int ip6_datagram_connect(struct sock *sk,
    struct sockaddr *addr, int addr_len);

    -extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
    -extern int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len);
    +extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
    + int *addr_len);
    +extern int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
    + int *addr_len);
    extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
    u32 info, u8 *payload);
    extern void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
    --- a/net/ipv4/ip_sockglue.c
    +++ b/net/ipv4/ip_sockglue.c
    @@ -367,7 +367,7 @@ void ip_local_error(struct sock *sk, int
    /*
    * Handle MSG_ERRQUEUE
    */
    -int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
    +int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
    {
    struct sock_exterr_skb *serr;
    struct sk_buff *skb, *skb2;
    @@ -404,6 +404,7 @@ int ip_recv_error(struct sock *sk, struc
    serr->addr_offset);
    sin->sin_port = serr->port;
    memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
    + *addr_len = sizeof(*sin);
    }

    memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
    --- a/net/ipv4/ping.c
    +++ b/net/ipv4/ping.c
    @@ -634,7 +634,7 @@ static int ping_recvmsg(struct kiocb *io
    goto out;

    if (flags & MSG_ERRQUEUE)
    - return ip_recv_error(sk, msg, len);
    + return ip_recv_error(sk, msg, len, addr_len);

    skb = skb_recv_datagram(sk, flags, noblock, &err);
    if (!skb)
    --- a/net/ipv4/raw.c
    +++ b/net/ipv4/raw.c
    @@ -689,7 +689,7 @@ static int raw_recvmsg(struct kiocb *ioc
    goto out;

    if (flags & MSG_ERRQUEUE) {
    - err = ip_recv_error(sk, msg, len);
    + err = ip_recv_error(sk, msg, len, addr_len);
    goto out;
    }

    --- a/net/ipv4/udp.c
    +++ b/net/ipv4/udp.c
    @@ -1175,7 +1175,7 @@ int udp_recvmsg(struct kiocb *iocb, stru
    bool slow;

    if (flags & MSG_ERRQUEUE)
    - return ip_recv_error(sk, msg, len);
    + return ip_recv_error(sk, msg, len, addr_len);

    try_again:
    skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
    --- a/net/ipv6/datagram.c
    +++ b/net/ipv6/datagram.c
    @@ -315,7 +315,7 @@ void ipv6_local_rxpmtu(struct sock *sk,
    /*
    * Handle MSG_ERRQUEUE
    */
    -int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
    +int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
    {
    struct ipv6_pinfo *np = inet6_sk(sk);
    struct sock_exterr_skb *serr;
    @@ -366,6 +366,7 @@ int ipv6_recv_error(struct sock *sk, str
    ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
    &sin->sin6_addr);
    }
    + *addr_len = sizeof(*sin);
    }

    memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
    @@ -418,7 +419,8 @@ out:
    /*
    * Handle IPV6_RECVPATHMTU
    */
    -int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len)
    +int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
    + int *addr_len)
    {
    struct ipv6_pinfo *np = inet6_sk(sk);
    struct sk_buff *skb;
    @@ -452,6 +454,7 @@ int ipv6_recv_rxpmtu(struct sock *sk, st
    sin->sin6_port = 0;
    sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
    sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
    + *addr_len = sizeof(*sin);
    }

    put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
    --- a/net/ipv6/raw.c
    +++ b/net/ipv6/raw.c
    @@ -458,10 +458,10 @@ static int rawv6_recvmsg(struct kiocb *i
    return -EOPNOTSUPP;

    if (flags & MSG_ERRQUEUE)
    - return ipv6_recv_error(sk, msg, len);
    + return ipv6_recv_error(sk, msg, len, addr_len);

    if (np->rxpmtu && np->rxopt.bits.rxpmtu)
    - return ipv6_recv_rxpmtu(sk, msg, len);
    + return ipv6_recv_rxpmtu(sk, msg, len, addr_len);

    skb = skb_recv_datagram(sk, flags, noblock, &err);
    if (!skb)
    --- a/net/ipv6/udp.c
    +++ b/net/ipv6/udp.c
    @@ -349,10 +349,10 @@ int udpv6_recvmsg(struct kiocb *iocb, st
    bool slow;

    if (flags & MSG_ERRQUEUE)
    - return ipv6_recv_error(sk, msg, len);
    + return ipv6_recv_error(sk, msg, len, addr_len);

    if (np->rxpmtu && np->rxopt.bits.rxpmtu)
    - return ipv6_recv_rxpmtu(sk, msg, len);
    + return ipv6_recv_rxpmtu(sk, msg, len, addr_len);

    try_again:
    skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),



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