[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Message-ID: <20220204193827.019e7791@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date: Fri, 4 Feb 2022 19:38:27 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Ariel Elior <aelior@...vell.com>,
Sudarsana Kalluru <skalluru@...vell.com>,
Manish Chopra <manishc@...vell.com>,
"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] bnx2x: Replace one-element array with
flexible-array member
On Fri, 4 Feb 2022 17:21:44 -0600 Gustavo A. R. Silva wrote:
> There is a regular need in the kernel to provide a way to declare having
> a dynamically sized set of trailing elements in a structure. Kernel code
> should always use “flexible array members”[1] for these cases. The older
> style of one-element or zero-length arrays should no longer be used[2].
>
> This helps with the ongoing efforts to globally enable -Warray-bounds
> and get us closer to being able to tighten the FORTIFY_SOURCE routines
> on memcpy().
>
> This issue was found with the help of Coccinelle and audited and fixed,
> manually.
>
> [1] https://en.wikipedia.org/wiki/Flexible_array_member
> [2] https://www.kernel.org/doc/html/v5.16/process/deprecated.html#zero-length-and-one-element-arrays
>
> Link: https://github.com/KSPP/linux/issues/79
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
Would be useful to include the analysis confirming the change is safe
in this case, beyond the boiler plate commit message.
Reviewed-by: Jakub Kicinski <kuba@...nel.org>
Powered by blists - more mailing lists