[PATCH net] ibmvnic: Don't reference skb after sending to VIOS

[PATCH net] ibmvnic: Don't reference skb after sending to VIOS

[Nick Child]

Previously, after successfully flushing the xmit buffer to VIOS,
the tx_bytes stat was incremented by the length of the skb.

It is invalid to access the skb memory after sending the buffer to
the VIOS because, at any point after sending, the VIOS can trigger
an interrupt to free this memory. A race between reading skb->len
and freeing the skb is possible (especially during LPM) and will
result in use-after-free:
 ==================================================================
 BUG: KASAN: slab-use-after-free in ibmvnic_xmit+0x75c/0x1808 [ibmvnic]
 Read of size 4 at addr c00000024eb48a70 by task hxecom/14495
 <...>
 Call Trace:
 [c000000118f66cf0] [c0000000018cba6c] dump_stack_lvl+0x84/0xe8 (unreliable)
 [c000000118f66d20] [c0000000006f0080] print_report+0x1a8/0x7f0
 [c000000118f66df0] [c0000000006f08f0] kasan_report+0x128/0x1f8
 [c000000118f66f00] [c0000000006f2868] __asan_load4+0xac/0xe0
 [c000000118f66f20] [c0080000046eac84] ibmvnic_xmit+0x75c/0x1808 [ibmvnic]
 [c000000118f67340] [c0000000014be168] dev_hard_start_xmit+0x150/0x358
 <...>
 Freed by task 0:
 kasan_save_stack+0x34/0x68
 kasan_save_track+0x2c/0x50
 kasan_save_free_info+0x64/0x108
 __kasan_mempool_poison_object+0x148/0x2d4
 napi_skb_cache_put+0x5c/0x194
 net_tx_action+0x154/0x5b8
 handle_softirqs+0x20c/0x60c
 do_softirq_own_stack+0x6c/0x88
 <...>
 The buggy address belongs to the object at c00000024eb48a00 which
  belongs to the cache skbuff_head_cache of size 224
==================================================================

Fixes: 032c5e82847a ("Driver for IBM System i/p VNIC protocol")
Signed-off-by: Nick Child <nnac123@linux.ibm.com>
---
 drivers/net/ethernet/ibm/ibmvnic.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index e95ae0d39948..0676fc547b6f 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -2408,6 +2408,7 @@ static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
 	dma_addr_t data_dma_addr;
 	struct netdev_queue *txq;
 	unsigned long lpar_rc;
+	unsigned int skblen;
 	union sub_crq tx_crq;
 	unsigned int offset;
 	bool use_scrq_send_direct = false;
@@ -2522,6 +2523,7 @@ static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
 	tx_buff->skb = skb;
 	tx_buff->index = bufidx;
 	tx_buff->pool_index = queue_num;
+	skblen = skb->len;
 
 	memset(&tx_crq, 0, sizeof(tx_crq));
 	tx_crq.v1.first = IBMVNIC_CRQ_CMD;
@@ -2614,7 +2616,7 @@ static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
 		netif_stop_subqueue(netdev, queue_num);
 	}
 
-	tx_bytes += skb->len;
+	tx_bytes += skblen;
 	txq_trans_cond_update(txq);
 	ret = NETDEV_TX_OK;
 	goto out;
-- 
2.48.0

Re: [PATCH net] ibmvnic: Don't reference skb after sending to VIOS

[Simon Horman]

On Fri, Feb 14, 2025 at 09:52:33AM -0600, Nick Child wrote:
> Previously, after successfully flushing the xmit buffer to VIOS,
> the tx_bytes stat was incremented by the length of the skb.
> 
> It is invalid to access the skb memory after sending the buffer to
> the VIOS because, at any point after sending, the VIOS can trigger
> an interrupt to free this memory. A race between reading skb->len
> and freeing the skb is possible (especially during LPM) and will
> result in use-after-free:
>  ==================================================================
>  BUG: KASAN: slab-use-after-free in ibmvnic_xmit+0x75c/0x1808 [ibmvnic]
>  Read of size 4 at addr c00000024eb48a70 by task hxecom/14495
>  <...>
>  Call Trace:
>  [c000000118f66cf0] [c0000000018cba6c] dump_stack_lvl+0x84/0xe8 (unreliable)
>  [c000000118f66d20] [c0000000006f0080] print_report+0x1a8/0x7f0
>  [c000000118f66df0] [c0000000006f08f0] kasan_report+0x128/0x1f8
>  [c000000118f66f00] [c0000000006f2868] __asan_load4+0xac/0xe0
>  [c000000118f66f20] [c0080000046eac84] ibmvnic_xmit+0x75c/0x1808 [ibmvnic]
>  [c000000118f67340] [c0000000014be168] dev_hard_start_xmit+0x150/0x358
>  <...>
>  Freed by task 0:
>  kasan_save_stack+0x34/0x68
>  kasan_save_track+0x2c/0x50
>  kasan_save_free_info+0x64/0x108
>  __kasan_mempool_poison_object+0x148/0x2d4
>  napi_skb_cache_put+0x5c/0x194
>  net_tx_action+0x154/0x5b8
>  handle_softirqs+0x20c/0x60c
>  do_softirq_own_stack+0x6c/0x88
>  <...>
>  The buggy address belongs to the object at c00000024eb48a00 which
>   belongs to the cache skbuff_head_cache of size 224
> ==================================================================
> 
> Fixes: 032c5e82847a ("Driver for IBM System i/p VNIC protocol")
> Signed-off-by: Nick Child <nnac123@linux.ibm.com>

Reviewed-by: Simon Horman <horms@kernel.org>

Re: [PATCH net] ibmvnic: Don't reference skb after sending to VIOS

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Fri, 14 Feb 2025 09:52:33 -0600 you wrote:
> Previously, after successfully flushing the xmit buffer to VIOS,
> the tx_bytes stat was incremented by the length of the skb.
> 
> It is invalid to access the skb memory after sending the buffer to
> the VIOS because, at any point after sending, the VIOS can trigger
> an interrupt to free this memory. A race between reading skb->len
> and freeing the skb is possible (especially during LPM) and will
> result in use-after-free:
>  ==================================================================
>  BUG: KASAN: slab-use-after-free in ibmvnic_xmit+0x75c/0x1808 [ibmvnic]
>  Read of size 4 at addr c00000024eb48a70 by task hxecom/14495
>  <...>
>  Call Trace:
>  [c000000118f66cf0] [c0000000018cba6c] dump_stack_lvl+0x84/0xe8 (unreliable)
>  [c000000118f66d20] [c0000000006f0080] print_report+0x1a8/0x7f0
>  [c000000118f66df0] [c0000000006f08f0] kasan_report+0x128/0x1f8
>  [c000000118f66f00] [c0000000006f2868] __asan_load4+0xac/0xe0
>  [c000000118f66f20] [c0080000046eac84] ibmvnic_xmit+0x75c/0x1808 [ibmvnic]
>  [c000000118f67340] [c0000000014be168] dev_hard_start_xmit+0x150/0x358
>  <...>
>  Freed by task 0:
>  kasan_save_stack+0x34/0x68
>  kasan_save_track+0x2c/0x50
>  kasan_save_free_info+0x64/0x108
>  __kasan_mempool_poison_object+0x148/0x2d4
>  napi_skb_cache_put+0x5c/0x194
>  net_tx_action+0x154/0x5b8
>  handle_softirqs+0x20c/0x60c
>  do_softirq_own_stack+0x6c/0x88
>  <...>
>  The buggy address belongs to the object at c00000024eb48a00 which
>   belongs to the cache skbuff_head_cache of size 224
> ==================================================================
> 
> [...]

Here is the summary with links:
  - [net] ibmvnic: Don't reference skb after sending to VIOS
    https://git.kernel.org/netdev/net/c/bdf5d13aa05e

You are awesome, thank you!
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