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author | John Fastabend <john.r.fastabend@intel.com> | 2012-01-28 03:32:17 (GMT) |
---|---|---|
committer | Jeff Kirsher <jeffrey.t.kirsher@intel.com> | 2012-02-09 09:27:47 (GMT) |
commit | 9cc00b51a3cbb3b933065a55eaa9bfc306411b7a (patch) | |
tree | 5dc0dec3837ed23e0f2f0d070ebbf98d4243cdc0 | |
parent | 5facb8e0c4dc1c8c47b71fd7f376defe16185733 (diff) | |
download | linux-9cc00b51a3cbb3b933065a55eaa9bfc306411b7a.tar.xz |
ixgbe: ethtool: stats user buffer overrun
If the number of tx/rx queues changes the ethtool ioctl
ETHTOOL_GSTATS may overrun the userspace buffer. This
occurs because the general practice in user space to
query stats is to issue a ETHTOOL_GSSET cmd to learn the
buffer size needed, allocate the buffer, then call
ETHTOOL_GSTIRNGS and ETHTOOL_GSTATS. If the number of
real_num_queues is changed or flow control attributes
are changed after ETHTOOL_GSSET but before the
ETHTOOL_GSTRINGS/ETHTOOL_GSTATS a user space buffer
overrun occurs.
To fix the overrun always return the max buffer size
needed from get_sset_count() then return all strings
and stats from get_strings()/get_ethtool_stats().
This _will_ change the output from the ioctl() call
which could break applications and script parsing in
theory. I believe these changes should not break existing
tools because the only changes will be more {tx|rx}_queues
and the {tx|rx}_pb_* stats will always be returned.
Existing scripts already need to handle changing number
of queues because this occurs today depending on system
and current features. The {tx|rx}_pb_* stats are at the
end of the output and should be handled by scripts today
regardless.
Finally get_ethtool_stats and get_strings are free-form
outputs tools parsing these outputs should be defensive
anyways. In the end these updates are better then
having a tool segfault because of a buffer overrun.
Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
-rw-r--r-- | drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c | 88 |
1 files changed, 51 insertions, 37 deletions
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c index 1f31a04..a629754 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c @@ -120,19 +120,23 @@ static const struct ixgbe_stats ixgbe_gstrings_stats[] = { #endif /* IXGBE_FCOE */ }; -#define IXGBE_QUEUE_STATS_LEN \ - ((((struct ixgbe_adapter *)netdev_priv(netdev))->num_tx_queues + \ - ((struct ixgbe_adapter *)netdev_priv(netdev))->num_rx_queues) * \ +/* ixgbe allocates num_tx_queues and num_rx_queues symmetrically so + * we set the num_rx_queues to evaluate to num_tx_queues. This is + * used because we do not have a good way to get the max number of + * rx queues with CONFIG_RPS disabled. + */ +#define IXGBE_NUM_RX_QUEUES netdev->num_tx_queues + +#define IXGBE_QUEUE_STATS_LEN ( \ + (netdev->num_tx_queues + IXGBE_NUM_RX_QUEUES) * \ (sizeof(struct ixgbe_queue_stats) / sizeof(u64))) #define IXGBE_GLOBAL_STATS_LEN ARRAY_SIZE(ixgbe_gstrings_stats) #define IXGBE_PB_STATS_LEN ( \ - (((struct ixgbe_adapter *)netdev_priv(netdev))->flags & \ - IXGBE_FLAG_DCB_ENABLED) ? \ - (sizeof(((struct ixgbe_adapter *)0)->stats.pxonrxc) + \ - sizeof(((struct ixgbe_adapter *)0)->stats.pxontxc) + \ - sizeof(((struct ixgbe_adapter *)0)->stats.pxoffrxc) + \ - sizeof(((struct ixgbe_adapter *)0)->stats.pxofftxc)) \ - / sizeof(u64) : 0) + (sizeof(((struct ixgbe_adapter *)0)->stats.pxonrxc) + \ + sizeof(((struct ixgbe_adapter *)0)->stats.pxontxc) + \ + sizeof(((struct ixgbe_adapter *)0)->stats.pxoffrxc) + \ + sizeof(((struct ixgbe_adapter *)0)->stats.pxofftxc)) \ + / sizeof(u64)) #define IXGBE_STATS_LEN (IXGBE_GLOBAL_STATS_LEN + \ IXGBE_PB_STATS_LEN + \ IXGBE_QUEUE_STATS_LEN) @@ -1078,8 +1082,15 @@ static void ixgbe_get_ethtool_stats(struct net_device *netdev, data[i] = (ixgbe_gstrings_stats[i].sizeof_stat == sizeof(u64)) ? *(u64 *)p : *(u32 *)p; } - for (j = 0; j < adapter->num_tx_queues; j++) { + for (j = 0; j < IXGBE_NUM_RX_QUEUES; j++) { ring = adapter->tx_ring[j]; + if (!ring) { + data[i] = 0; + data[i+1] = 0; + i += 2; + continue; + } + do { start = u64_stats_fetch_begin_bh(&ring->syncp); data[i] = ring->stats.packets; @@ -1087,8 +1098,15 @@ static void ixgbe_get_ethtool_stats(struct net_device *netdev, } while (u64_stats_fetch_retry_bh(&ring->syncp, start)); i += 2; } - for (j = 0; j < adapter->num_rx_queues; j++) { + for (j = 0; j < IXGBE_NUM_RX_QUEUES; j++) { ring = adapter->rx_ring[j]; + if (!ring) { + data[i] = 0; + data[i+1] = 0; + i += 2; + continue; + } + do { start = u64_stats_fetch_begin_bh(&ring->syncp); data[i] = ring->stats.packets; @@ -1096,22 +1114,20 @@ static void ixgbe_get_ethtool_stats(struct net_device *netdev, } while (u64_stats_fetch_retry_bh(&ring->syncp, start)); i += 2; } - if (adapter->flags & IXGBE_FLAG_DCB_ENABLED) { - for (j = 0; j < MAX_TX_PACKET_BUFFERS; j++) { - data[i++] = adapter->stats.pxontxc[j]; - data[i++] = adapter->stats.pxofftxc[j]; - } - for (j = 0; j < MAX_RX_PACKET_BUFFERS; j++) { - data[i++] = adapter->stats.pxonrxc[j]; - data[i++] = adapter->stats.pxoffrxc[j]; - } + + for (j = 0; j < IXGBE_MAX_PACKET_BUFFERS; j++) { + data[i++] = adapter->stats.pxontxc[j]; + data[i++] = adapter->stats.pxofftxc[j]; + } + for (j = 0; j < IXGBE_MAX_PACKET_BUFFERS; j++) { + data[i++] = adapter->stats.pxonrxc[j]; + data[i++] = adapter->stats.pxoffrxc[j]; } } static void ixgbe_get_strings(struct net_device *netdev, u32 stringset, u8 *data) { - struct ixgbe_adapter *adapter = netdev_priv(netdev); char *p = (char *)data; int i; @@ -1126,31 +1142,29 @@ static void ixgbe_get_strings(struct net_device *netdev, u32 stringset, ETH_GSTRING_LEN); p += ETH_GSTRING_LEN; } - for (i = 0; i < adapter->num_tx_queues; i++) { + for (i = 0; i < netdev->num_tx_queues; i++) { sprintf(p, "tx_queue_%u_packets", i); p += ETH_GSTRING_LEN; sprintf(p, "tx_queue_%u_bytes", i); p += ETH_GSTRING_LEN; } - for (i = 0; i < adapter->num_rx_queues; i++) { + for (i = 0; i < IXGBE_NUM_RX_QUEUES; i++) { sprintf(p, "rx_queue_%u_packets", i); p += ETH_GSTRING_LEN; sprintf(p, "rx_queue_%u_bytes", i); p += ETH_GSTRING_LEN; } - if (adapter->flags & IXGBE_FLAG_DCB_ENABLED) { - for (i = 0; i < MAX_TX_PACKET_BUFFERS; i++) { - sprintf(p, "tx_pb_%u_pxon", i); - p += ETH_GSTRING_LEN; - sprintf(p, "tx_pb_%u_pxoff", i); - p += ETH_GSTRING_LEN; - } - for (i = 0; i < MAX_RX_PACKET_BUFFERS; i++) { - sprintf(p, "rx_pb_%u_pxon", i); - p += ETH_GSTRING_LEN; - sprintf(p, "rx_pb_%u_pxoff", i); - p += ETH_GSTRING_LEN; - } + for (i = 0; i < IXGBE_MAX_PACKET_BUFFERS; i++) { + sprintf(p, "tx_pb_%u_pxon", i); + p += ETH_GSTRING_LEN; + sprintf(p, "tx_pb_%u_pxoff", i); + p += ETH_GSTRING_LEN; + } + for (i = 0; i < IXGBE_MAX_PACKET_BUFFERS; i++) { + sprintf(p, "rx_pb_%u_pxon", i); + p += ETH_GSTRING_LEN; + sprintf(p, "rx_pb_%u_pxoff", i); + p += ETH_GSTRING_LEN; } /* BUG_ON(p - data != IXGBE_STATS_LEN * ETH_GSTRING_LEN); */ break; |