[PATCH net v3] e1000: add dummy allocator to fix race condition between mtu change and netpoll

[PATCH net v3] e1000: add dummy allocator to fix race condition between mtu change and netpoll

[Sabrina Dubroca]

There is a race condition between e1000_change_mtu's cleanups and
netpoll, when we change the MTU across jumbo size:

Changing MTU frees all the rx buffers:
    e1000_change_mtu -> e1000_down -> e1000_clean_all_rx_rings ->
        e1000_clean_rx_ring

Then, close to the end of e1000_change_mtu:
    pr_info -> ... -> netpoll_poll_dev -> e1000_clean ->
        e1000_clean_rx_irq -> e1000_alloc_rx_buffers -> e1000_alloc_frag

And when we come back to do the rest of the MTU change:
    e1000_up -> e1000_configure -> e1000_configure_rx ->
        e1000_alloc_jumbo_rx_buffers

alloc_jumbo finds the buffers already != NULL, since data (shared with
page in e1000_rx_buffer->rxbuf) has been re-alloc'd, but it's garbage,
or at least not what is expected when in jumbo state.

This results in an unusable adapter (packets don't get through), and a
NULL pointer dereference on the next call to e1000_clean_rx_ring
(other mtu change, link down, shutdown):

BUG: unable to handle kernel NULL pointer dereference at           (null)
IP: [<ffffffff81194d6e>] put_compound_page+0x7e/0x330

    [...]

Call Trace:
 [<ffffffff81195445>] put_page+0x55/0x60
 [<ffffffff815d9f44>] e1000_clean_rx_ring+0x134/0x200
 [<ffffffff815da055>] e1000_clean_all_rx_rings+0x45/0x60
 [<ffffffff815df5e0>] e1000_down+0x1c0/0x1d0
 [<ffffffff811e2260>] ? deactivate_slab+0x7f0/0x840
 [<ffffffff815e21bc>] e1000_change_mtu+0xdc/0x170
 [<ffffffff81647050>] dev_set_mtu+0xa0/0x140
 [<ffffffff81664218>] do_setlink+0x218/0xac0
 [<ffffffff814459e9>] ? nla_parse+0xb9/0x120
 [<ffffffff816652d0>] rtnl_newlink+0x6d0/0x890
 [<ffffffff8104f000>] ? kvm_clock_read+0x20/0x40
 [<ffffffff810a2068>] ? sched_clock_cpu+0xa8/0x100
 [<ffffffff81663802>] rtnetlink_rcv_msg+0x92/0x260

By setting the allocator to a dummy version, netpoll can't mess up our
rx buffers.  The allocator is set back to a sane value in
e1000_configure_rx.

Fixes: edbbb3ca1077 ("e1000: implement jumbo receive with partial descriptors")
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>

---

v2: Eric Dumazet suggested to remove the forward declaration of
       e1000_alloc_dummy_rx_buffers
v3: cleanup whitespace from v1

 drivers/net/ethernet/intel/e1000/e1000_main.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/e1000/e1000_main.c b/drivers/net/ethernet/intel/e1000/e1000_main.c
index 7f997d36948f..a71c446631d1 100644
--- a/drivers/net/ethernet/intel/e1000/e1000_main.c
+++ b/drivers/net/ethernet/intel/e1000/e1000_main.c
@@ -144,6 +144,11 @@ static bool e1000_clean_rx_irq(struct e1000_adapter *adapter,
 static bool e1000_clean_jumbo_rx_irq(struct e1000_adapter *adapter,
 				     struct e1000_rx_ring *rx_ring,
 				     int *work_done, int work_to_do);
+static void e1000_alloc_dummy_rx_buffers(struct e1000_adapter *adapter,
+					 struct e1000_rx_ring *rx_ring,
+					 int cleaned_count)
+{
+}
 static void e1000_alloc_rx_buffers(struct e1000_adapter *adapter,
 				   struct e1000_rx_ring *rx_ring,
 				   int cleaned_count);
@@ -3552,8 +3557,11 @@ static int e1000_change_mtu(struct net_device *netdev, int new_mtu)
 		msleep(1);
 	/* e1000_down has a dependency on max_frame_size */
 	hw->max_frame_size = max_frame;
-	if (netif_running(netdev))
+	if (netif_running(netdev)) {
+		/* prevent buffers from being reallocated */
+		adapter->alloc_rx_buf = e1000_alloc_dummy_rx_buffers;
 		e1000_down(adapter);
+	}
 
 	/* NOTE: netdev_alloc_skb reserves 16 bytes, and typically NET_IP_ALIGN
 	 * means we reserve 2 more, this pushes us to allocate from the next
-- 
2.3.0

Re: [PATCH net v3] e1000: add dummy allocator to fix race condition between mtu change and netpoll

[Jeff Kirsher]

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On Wed, 2015-02-25 at 12:26 +0100, Sabrina Dubroca wrote:
> There is a race condition between e1000_change_mtu's cleanups and
> netpoll, when we change the MTU across jumbo size:
> 
> Changing MTU frees all the rx buffers:
>     e1000_change_mtu -> e1000_down -> e1000_clean_all_rx_rings ->
>         e1000_clean_rx_ring
> 
> Then, close to the end of e1000_change_mtu:
>     pr_info -> ... -> netpoll_poll_dev -> e1000_clean ->
>         e1000_clean_rx_irq -> e1000_alloc_rx_buffers ->
> e1000_alloc_frag
> 
> And when we come back to do the rest of the MTU change:
>     e1000_up -> e1000_configure -> e1000_configure_rx ->
>         e1000_alloc_jumbo_rx_buffers
> 
> alloc_jumbo finds the buffers already != NULL, since data (shared with
> page in e1000_rx_buffer->rxbuf) has been re-alloc'd, but it's garbage,
> or at least not what is expected when in jumbo state.
> 
> This results in an unusable adapter (packets don't get through), and a
> NULL pointer dereference on the next call to e1000_clean_rx_ring
> (other mtu change, link down, shutdown):
> 
> BUG: unable to handle kernel NULL pointer dereference at
> (null)
> IP: [<ffffffff81194d6e>] put_compound_page+0x7e/0x330
> 
>     [...]
> 
> Call Trace:
>  [<ffffffff81195445>] put_page+0x55/0x60
>  [<ffffffff815d9f44>] e1000_clean_rx_ring+0x134/0x200
>  [<ffffffff815da055>] e1000_clean_all_rx_rings+0x45/0x60
>  [<ffffffff815df5e0>] e1000_down+0x1c0/0x1d0
>  [<ffffffff811e2260>] ? deactivate_slab+0x7f0/0x840
>  [<ffffffff815e21bc>] e1000_change_mtu+0xdc/0x170
>  [<ffffffff81647050>] dev_set_mtu+0xa0/0x140
>  [<ffffffff81664218>] do_setlink+0x218/0xac0
>  [<ffffffff814459e9>] ? nla_parse+0xb9/0x120
>  [<ffffffff816652d0>] rtnl_newlink+0x6d0/0x890
>  [<ffffffff8104f000>] ? kvm_clock_read+0x20/0x40
>  [<ffffffff810a2068>] ? sched_clock_cpu+0xa8/0x100
>  [<ffffffff81663802>] rtnetlink_rcv_msg+0x92/0x260
> 
> By setting the allocator to a dummy version, netpoll can't mess up our
> rx buffers.  The allocator is set back to a sane value in
> e1000_configure_rx.
> 
> Fixes: edbbb3ca1077 ("e1000: implement jumbo receive with partial
> descriptors")
> Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
> 
> ---
> 
> v2: Eric Dumazet suggested to remove the forward declaration of
>        e1000_alloc_dummy_rx_buffers
> v3: cleanup whitespace from v1
> 
>  drivers/net/ethernet/intel/e1000/e1000_main.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)

I have update the patch in my queue, to this latest version.  Thanks

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