| Message ID | 20170515045200.27789-1-bjorn.topel@gmail.com |
|---|---|
| State | Accepted |
| Delegated to: | Jeff Kirsher |
| Headers | show |
On Mon, 2017-05-15 at 06:52 +0200, Björn Töpel wrote: > From: Björn Töpel <bjorn.topel@intel.com> > > In f8b45b74cc62 ("i40e/i40evf: Use build_skb to build frames") > i40e_build_skb updates the page_offset field with an incorrect offset, > which can lead to data corruption. This patch updates page_offset > correctly, by properly setting truesize. > > Note that the bug only appears on architectures where PAGE_SIZE is > 8192 or larger. > > Fixes: f8b45b74cc62 ("i40e/i40evf: Use build_skb to build frames") > Signed-off-by: Björn Töpel <bjorn.topel@intel.com> Acked-by: Alexander Duyck <alexander.h.duyck@intel.com> > --- > drivers/net/ethernet/intel/i40e/i40e_txrx.c | 3 ++- > drivers/net/ethernet/intel/i40evf/i40e_txrx.c | 3 ++- > 2 files changed, 4 insertions(+), 2 deletions(-) > > diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c > index 29321a6167a6..cd894f4023b1 100644 > --- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c > +++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c > @@ -1854,7 +1854,8 @@ static struct sk_buff *i40e_build_skb(struct i40e_ring *rx_ring, > #if (PAGE_SIZE < 8192) > unsigned int truesize = i40e_rx_pg_size(rx_ring) / 2; > #else > - unsigned int truesize = SKB_DATA_ALIGN(size); > + unsigned int truesize = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) + > + SKB_DATA_ALIGN(I40E_SKB_PAD + size); > #endif > struct sk_buff *skb; > > diff --git a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c > index dfe241a12ad0..12b02e530503 100644 > --- a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c > +++ b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c > @@ -1190,7 +1190,8 @@ static struct sk_buff *i40e_build_skb(struct i40e_ring *rx_ring, > #if (PAGE_SIZE < 8192) > unsigned int truesize = i40e_rx_pg_size(rx_ring) / 2; > #else > - unsigned int truesize = SKB_DATA_ALIGN(size); > + unsigned int truesize = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) + > + SKB_DATA_ALIGN(I40E_SKB_PAD + size); > #endif > struct sk_buff *skb; >
> -----Original Message----- > From: Intel-wired-lan [mailto:intel-wired-lan-bounces@osuosl.org] On > Behalf Of Björn Töpel > Sent: Sunday, May 14, 2017 9:52 PM > To: netdev@vger.kernel.org; intel-wired-lan@lists.osuosl.org > Cc: Topel, Bjorn <bjorn.topel@intel.com> > Subject: [Intel-wired-lan] [PATCH net v2] i40e/i40evf: proper update of the > page_offset field > > From: Björn Töpel <bjorn.topel@intel.com> > > In f8b45b74cc62 ("i40e/i40evf: Use build_skb to build frames") > i40e_build_skb updates the page_offset field with an incorrect offset, which > can lead to data corruption. This patch updates page_offset correctly, by > properly setting truesize. > > Note that the bug only appears on architectures where PAGE_SIZE is > 8192 or larger. > > Fixes: f8b45b74cc62 ("i40e/i40evf: Use build_skb to build frames") > Signed-off-by: Björn Töpel <bjorn.topel@intel.com> > --- > drivers/net/ethernet/intel/i40e/i40e_txrx.c | 3 ++- > drivers/net/ethernet/intel/i40evf/i40e_txrx.c | 3 ++- > 2 files changed, 4 insertions(+), 2 deletions(-) Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c index 29321a6167a6..cd894f4023b1 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c +++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c @@ -1854,7 +1854,8 @@ static struct sk_buff *i40e_build_skb(struct i40e_ring *rx_ring, #if (PAGE_SIZE < 8192) unsigned int truesize = i40e_rx_pg_size(rx_ring) / 2; #else - unsigned int truesize = SKB_DATA_ALIGN(size); + unsigned int truesize = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) + + SKB_DATA_ALIGN(I40E_SKB_PAD + size); #endif struct sk_buff *skb; diff --git a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c index dfe241a12ad0..12b02e530503 100644 --- a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c +++ b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c @@ -1190,7 +1190,8 @@ static struct sk_buff *i40e_build_skb(struct i40e_ring *rx_ring, #if (PAGE_SIZE < 8192) unsigned int truesize = i40e_rx_pg_size(rx_ring) / 2; #else - unsigned int truesize = SKB_DATA_ALIGN(size); + unsigned int truesize = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) + + SKB_DATA_ALIGN(I40E_SKB_PAD + size); #endif struct sk_buff *skb;