From 4898198378a84fc6abd34adf5d0e297f4206b006 Mon Sep 17 00:00:00 2001 From: Xiao Wang Date: Fri, 17 May 2019 07:29:37 +0200 Subject: [PATCH 3/9] net: drop too large packet early RH-Author: Xiao Wang Message-id: <1558078177-372-4-git-send-email-jasowang@redhat.com> Patchwork-id: 88015 O-Subject: [RHEL7.7 qemu-kvm-rhev PATCH 3/3] net: drop too large packet early Bugzilla: 1636780 RH-Acked-by: Thomas Huth RH-Acked-by: Jens Freimann RH-Acked-by: Maxime Coquelin RH-Acked-by: Michael S. Tsirkin Bugzilla: 1636779 We try to detect and drop too large packet (>INT_MAX) in 1592a9947036 ("net: ignore packet size greater than INT_MAX") during packet delivering. Unfortunately, this is not sufficient as we may hit another integer overflow when trying to queue such large packet in qemu_net_queue_append_iov(): - size of the allocation may overflow on 32bit - packet->size is integer which may overflow even on 64bit Fixing this by moving the check to qemu_sendv_packet_async() which is the entrance of all networking codes and reduce the limit to NET_BUFSIZE to be more conservative. This works since: - For the callers that call qemu_sendv_packet_async() directly, they only care about if zero is returned to determine whether to prevent the source from producing more packets. A callback will be triggered if peer can accept more then source could be enabled. This is usually used by high speed networking implementation like virtio-net or netmap. - For the callers that call qemu_sendv_packet() that calls qemu_sendv_packet_async() indirectly, they often ignore the return value. In this case qemu will just the drop packets if peer can't receive. Qemu will copy the packet if it was queued. So it was safe for both kinds of the callers to assume the packet was sent. Since we move the check from qemu_deliver_packet_iov() to qemu_sendv_packet_async(), it would be safer to make qemu_deliver_packet_iov() static to prevent any external user in the future. This is a revised patch of CVE-2018-17963. Cc: qemu-stable@nongnu.org Cc: Li Qiang Fixes: 1592a9947036 ("net: ignore packet size greater than INT_MAX") Reported-by: Li Qiang Reviewed-by: Li Qiang Signed-off-by: Jason Wang Reviewed-by: Thomas Huth Message-id: 20181204035347.6148-2-jasowang@redhat.com Signed-off-by: Peter Maydell (cherry picked from commit 25c01bd19d0e4b66f357618aeefda1ef7a41e21a) Signed-off-by: Miroslav Rezanina --- include/net/net.h | 6 ------ net/net.c | 28 +++++++++++++++++----------- 2 files changed, 17 insertions(+), 17 deletions(-) diff --git a/include/net/net.h b/include/net/net.h index 1f7341e..df4df25 100644 --- a/include/net/net.h +++ b/include/net/net.h @@ -170,12 +170,6 @@ void qemu_check_nic_model(NICInfo *nd, const char *model); int qemu_find_nic_model(NICInfo *nd, const char * const *models, const char *default_model); -ssize_t qemu_deliver_packet_iov(NetClientState *sender, - unsigned flags, - const struct iovec *iov, - int iovcnt, - void *opaque); - void print_net_client(Monitor *mon, NetClientState *nc); void hmp_info_network(Monitor *mon, const QDict *qdict); void net_socket_rs_init(SocketReadState *rs, diff --git a/net/net.c b/net/net.c index c991243..6e5c335 100644 --- a/net/net.c +++ b/net/net.c @@ -231,6 +231,11 @@ static void qemu_net_client_destructor(NetClientState *nc) { g_free(nc); } +static ssize_t qemu_deliver_packet_iov(NetClientState *sender, + unsigned flags, + const struct iovec *iov, + int iovcnt, + void *opaque); static void qemu_net_client_setup(NetClientState *nc, NetClientInfo *info, @@ -705,22 +710,18 @@ static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov, return ret; } -ssize_t qemu_deliver_packet_iov(NetClientState *sender, - unsigned flags, - const struct iovec *iov, - int iovcnt, - void *opaque) +static ssize_t qemu_deliver_packet_iov(NetClientState *sender, + unsigned flags, + const struct iovec *iov, + int iovcnt, + void *opaque) { NetClientState *nc = opaque; - size_t size = iov_size(iov, iovcnt); int ret; - if (size > INT_MAX) { - return size; - } if (nc->link_down) { - return size; + return iov_size(iov, iovcnt); } if (nc->receive_disabled) { @@ -745,10 +746,15 @@ ssize_t qemu_sendv_packet_async(NetClientState *sender, NetPacketSent *sent_cb) { NetQueue *queue; + size_t size = iov_size(iov, iovcnt); int ret; + if (size > NET_BUFSIZE) { + return size; + } + if (sender->link_down || !sender->peer) { - return iov_size(iov, iovcnt); + return size; } /* Let filters handle the packet first */ -- 1.8.3.1