linux-kernel - Re: [PATCH net v4] tcp: devmem: don't write truncated dmabuf CMSGs to userspace

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Message-Id: 
 <174054003999.219541.1372303468063333953.git-patchwork-notify@kernel.org>
Date: Wed, 26 Feb 2025 03:20:39 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Stanislav Fomichev <sdf@...ichev.me>
Cc: netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
 kuba@...nel.org, pabeni@...hat.com, linux-kernel@...r.kernel.org,
 kuniyu@...zon.com, willemb@...gle.com, horms@...nel.org,
 ncardwell@...gle.com, dsahern@...nel.org, kaiyuanz@...gle.com,
 asml.silence@...il.com, almasrymina@...gle.com
Subject: Re: [PATCH net v4] tcp: devmem: don't write truncated dmabuf CMSGs to
 userspace

Hello:

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

On Mon, 24 Feb 2025 09:44:01 -0800 you wrote:
> Currently, we report -ETOOSMALL (err) only on the first iteration
> (!sent). When we get put_cmsg error after a bunch of successful
> put_cmsg calls, we don't signal the error at all. This might be
> confusing on the userspace side which will see truncated CMSGs
> but no MSG_CTRUNC signal.
> 
> Consider the following case:
> - sizeof(struct cmsghdr) = 16
> - sizeof(struct dmabuf_cmsg) = 24
> - total cmsg size (CMSG_LEN) = 40 (16+24)
> 
> [...]

Here is the summary with links:
  - [net,v4] tcp: devmem: don't write truncated dmabuf CMSGs to userspace
    https://git.kernel.org/netdev/net/c/18912c520674

You are awesome, thank you!
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