Re: [PATCH net] net: guard timestamp cmsgs to real error queue skbs

[patchwork-bot+netdevbpf@kernel.org]

Hello:

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

On Sat,  6 Jun 2026 19:18:19 -0700 you wrote:
> skb_is_err_queue() treats PACKET_OUTGOING as the sole marker for an skb
> from sk_error_queue. That assumption is not true for AF_PACKET sockets:
> outgoing packet taps are also delivered to packet sockets with
> skb->pkt_type == PACKET_OUTGOING, but their skb->cb is owned by AF_PACKET
> instead of struct sock_exterr_skb.
> 
> If such an skb is received with timestamping enabled, the generic
> timestamp cmsg path can read AF_PACKET control-buffer state as
> sock_exterr_skb::opt_stats. With SO_RXQ_OVFL enabled, the packet drop
> counter overlaps opt_stats. An odd drop count makes the path emit
> SCM_TIMESTAMPING_OPT_STATS with skb->len and skb->data. For non-linear
> skbs this copies past the linear head and can trigger hardened usercopy or
> disclose adjacent heap contents.
> 
> [...]

Here is the summary with links:
  - [net] net: guard timestamp cmsgs to real error queue skbs
    https://git.kernel.org/netdev/net/c/1ee90b77b727

You are awesome, thank you!
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