Re: [PATCH net v2] net: skmsg: preserve sg.copy across SG transforms

[patchwork-bot+netdevbpf]

Hello:

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

On Wed, 10 Jun 2026 06:21:36 +0000 you wrote:
> The sk_msg sg.copy bitmap is part of the scatterlist entry ownership
> state. A set bit tells sk_msg_compute_data_pointers() not to expose the
> entry through writable BPF ctx->data. This protects entries backed by
> pages that are not private to the sk_msg, such as splice-backed file
> page-cache pages.
> 
> Several sk_msg transform paths move, copy, split, or compact
> msg->sg.data[] entries without moving the matching sg.copy bit. This can
> make an externally backed entry arrive at a new slot with a clear copy
> bit. A later SK_MSG verdict can then expose sg_virt(sge) as writable
> ctx->data and BPF stores can modify the original page cache.
> 
> [...]

Here is the summary with links:
  - [net,v2] net: skmsg: preserve sg.copy across SG transforms
    https://git.kernel.org/netdev/net/c/406e8a651a7b

You are awesome, thank you!
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