From: patchwork-bot+netdevbpf@kernel.org
To: Kees Cook <kees@kernel.org>
Cc: kuba@kernel.org, andrew+netdev@lunn.ch, davem@davemloft.net,
edumazet@google.com, pabeni@redhat.com, horms@kernel.org,
gustavoars@kernel.org, qingfang.deng@linux.dev, jiri@resnulli.us,
spender@grsecurity.net, pageexec@gmail.com, morbo@google.com,
justinstitt@google.com, netdev@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org, linux-hardening@vger.kernel.org,
yeswanth@linux.ibm.com, stable@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH net-next net] netdev: Hide the netdev_priv() origin from GCC in netdev_from_priv()
Date: Tue, 20 Oct 2026 19:30:05 +0000 [thread overview]
Message-ID: <179252460578.172302.12338872662372096525.git-patchwork-notify@kernel.org> (raw)
In-Reply-To: <20261015165959.i.798-kees@kernel.org>
Hello:
This patch was applied to netdev/net-next.git (main)
by Jakub Kicinski <kuba@kernel.org>:
On Thu, 15 Oct 2026 10:00:03 -0700 you wrote:
> GCC 15.1 and later can compute an object size of 0 for a pointer that
> container_of() derives from a pointer into a __counted_by flexible array
> member[1]; Clang gets it right. netdev_from_priv() does this with struct
> net_device's "priv" array, so when GCC can see that its argument came
> from netdev_priv(), FORTIFY_SOURCE sees a zero-sized net_device. Since
> commit 9027497a25e3c ("team: use netdev_from_priv()"), adding a port of
> another type to a team device can then fail the memcpy() to
> "dev->broadcast" in team_setup_by_port(), which GCC sees through after
> inlining team_port_add() into team_add_slave():
>
> [...]
Here is the summary with links:
- [net-next,net] netdev: Hide the netdev_priv() origin from GCC in netdev_from_priv()
https://git.kernel.org/netdev/net-next/c/56f8d919739b
You are awesome, thank you!
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prev parent reply other threads:[~2026-10-20 19:30 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-15 17:00 [PATCH net-next net] netdev: Hide the netdev_priv() origin from GCC in netdev_from_priv() Kees Cook
2026-10-15 17:07 ` Kees Cook
2026-10-15 17:34 ` Jakub Kicinski
2026-10-15 17:58 ` Kees Cook
2026-10-16 15:19 ` Qingfang Deng
2026-10-20 19:30 ` patchwork-bot+netdevbpf [this message]
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