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authorWei Liu <wei.liu2@citrix.com>2014-04-01 12:46:12 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-04-14 06:50:03 -0700
commit7caaadd87daa11474872b63ff4edf745c6cb8550 (patch)
tree75fd215d2aa2e56eacc3525a860762c660df9e53
parent4370f4e5d510643604b6e650d551534074e73f6a (diff)
xen-netback: disable rogue vif in kthread context
[ Upstream commit e9d8b2c2968499c1f96563e6522c56958d5a1d0d ] When netback discovers frontend is sending malformed packet it will disables the interface which serves that frontend. However disabling a network interface involving taking a mutex which cannot be done in softirq context, so we need to defer this process to kthread context. This patch does the following: 1. introduce a flag to indicate the interface is disabled. 2. check that flag in TX path, don't do any work if it's true. 3. check that flag in RX path, turn off that interface if it's true. The reason to disable it in RX path is because RX uses kthread. After this change the behavior of netback is still consistent -- it won't do any TX work for a rogue frontend, and the interface will be eventually turned off. Also change a "continue" to "break" after xenvif_fatal_tx_err, as it doesn't make sense to continue processing packets if frontend is rogue. This is a fix for XSA-90. Reported-by: Török Edwin <edwin@etorok.net> Signed-off-by: Wei Liu <wei.liu2@citrix.com> Cc: Ian Campbell <ian.campbell@citrix.com> Reviewed-by: David Vrabel <david.vrabel@citrix.com> Acked-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/net/xen-netback/common.h5
-rw-r--r--drivers/net/xen-netback/interface.c11
-rw-r--r--drivers/net/xen-netback/netback.c16
3 files changed, 30 insertions, 2 deletions
diff --git a/drivers/net/xen-netback/common.h b/drivers/net/xen-netback/common.h
index ae413a2cbee7..4bf5b334664e 100644
--- a/drivers/net/xen-netback/common.h
+++ b/drivers/net/xen-netback/common.h
@@ -113,6 +113,11 @@ struct xenvif {
domid_t domid;
unsigned int handle;
+ /* Is this interface disabled? True when backend discovers
+ * frontend is rogue.
+ */
+ bool disabled;
+
/* Use NAPI for guest TX */
struct napi_struct napi;
/* When feature-split-event-channels = 0, tx_irq = rx_irq. */
diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c
index 301cc037fda8..2e92d52c0a6d 100644
--- a/drivers/net/xen-netback/interface.c
+++ b/drivers/net/xen-netback/interface.c
@@ -62,6 +62,15 @@ static int xenvif_poll(struct napi_struct *napi, int budget)
struct xenvif *vif = container_of(napi, struct xenvif, napi);
int work_done;
+ /* This vif is rogue, we pretend we've there is nothing to do
+ * for this vif to deschedule it from NAPI. But this interface
+ * will be turned off in thread context later.
+ */
+ if (unlikely(vif->disabled)) {
+ napi_complete(napi);
+ return 0;
+ }
+
work_done = xenvif_tx_action(vif, budget);
if (work_done < budget) {
@@ -321,6 +330,8 @@ struct xenvif *xenvif_alloc(struct device *parent, domid_t domid,
vif->ip_csum = 1;
vif->dev = dev;
+ vif->disabled = false;
+
vif->credit_bytes = vif->remaining_credit = ~0UL;
vif->credit_usec = 0UL;
init_timer(&vif->credit_timeout);
diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index cd0bd95ccc14..97030c193afd 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -680,7 +680,8 @@ static void xenvif_tx_err(struct xenvif *vif,
static void xenvif_fatal_tx_err(struct xenvif *vif)
{
netdev_err(vif->dev, "fatal error; disabling device\n");
- xenvif_carrier_off(vif);
+ vif->disabled = true;
+ xenvif_kick_thread(vif);
}
static int xenvif_count_requests(struct xenvif *vif,
@@ -1151,7 +1152,7 @@ static unsigned xenvif_tx_build_gops(struct xenvif *vif, int budget)
vif->tx.sring->req_prod, vif->tx.req_cons,
XEN_NETIF_TX_RING_SIZE);
xenvif_fatal_tx_err(vif);
- continue;
+ break;
}
work_to_do = RING_HAS_UNCONSUMED_REQUESTS(&vif->tx);
@@ -1573,7 +1574,18 @@ int xenvif_kthread(void *data)
while (!kthread_should_stop()) {
wait_event_interruptible(vif->wq,
rx_work_todo(vif) ||
+ vif->disabled ||
kthread_should_stop());
+
+ /* This frontend is found to be rogue, disable it in
+ * kthread context. Currently this is only set when
+ * netback finds out frontend sends malformed packet,
+ * but we cannot disable the interface in softirq
+ * context so we defer it here.
+ */
+ if (unlikely(vif->disabled && netif_carrier_ok(vif->dev)))
+ xenvif_carrier_off(vif);
+
if (kthread_should_stop())
break;