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From: Jakub Kicinski <kuba@kernel.org>
To: Kees Cook <keescook@chromium.org>
Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org>,
	Subash Abhinov Kasiviswanathan <quic_subashab@quicinc.com>,
	Sean Tranchetti <quic_stranche@quicinc.com>,
	"David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Paolo Abeni <pabeni@redhat.com>,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-hardening@vger.kernel.org
Subject: Re: [PATCH][next] net: ethernet: rmnet: Replace zero-length array with DECLARE_FLEX_ARRAY() helper
Date: Mon, 26 Sep 2022 17:26:04 -0700	[thread overview]
Message-ID: <20220926172604.71a20b7d@kernel.org> (raw)
In-Reply-To: <202209261502.7DB9C7119@keescook>

On Mon, 26 Sep 2022 15:02:48 -0700 Kees Cook wrote:
> On Mon, Sep 26, 2022 at 04:50:03PM -0500, Gustavo A. R. Silva wrote:
> > Zero-length arrays are deprecated and we are moving towards adopting
> > C99 flexible-array members, instead. So, replace zero-length arrays
> > declarations in anonymous union with the new DECLARE_FLEX_ARRAY()
> > helper macro.
> > 
> > This helper allows for flexible-array members in unions.
> > 
> > Link: https://github.com/KSPP/linux/issues/193
> > Link: https://github.com/KSPP/linux/issues/221
> > Link: https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
> > Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>  
> 
> Reviewed-by: Kees Cook <keescook@chromium.org>

Not directly related to this patch, but I just had to look at pahole
output for sk_buff and the struct_group() stuff makes is really painful
to read :/ Offsets for the members are relative to the "group" and they
are all repeated.

Is there any chance you could fix that? Before we sprinkle more pixie
dust around, perhaps?

  reply	other threads:[~2022-09-27  0:26 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-26 21:50 [PATCH][next] net: ethernet: rmnet: Replace zero-length array with DECLARE_FLEX_ARRAY() helper Gustavo A. R. Silva
2022-09-26 22:02 ` Kees Cook
2022-09-27  0:26   ` Jakub Kicinski [this message]
2022-09-27  2:22     ` Kees Cook
2022-09-27 14:07       ` Jakub Kicinski

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