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Date: Wed, 26 Jan 2022 13:28:54 -0800 From: Saeed Mahameed <saeedm@...dia.com> To: Kees Cook <keescook@...omium.org> Cc: Leon Romanovsky <leon@...nel.org>, "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org, linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org Subject: Re: [PATCH RESEND] net/mlx5e: Use struct_group() for memcpy() region On 24 Jan 09:22, Kees Cook wrote: >In preparation for FORTIFY_SOURCE performing compile-time and run-time >field bounds checking for memcpy(), memmove(), and memset(), avoid >intentionally writing across neighboring fields. > >Use struct_group() in struct vlan_ethhdr around members h_dest and >h_source, so they can be referenced together. This will allow memcpy() >and sizeof() to more easily reason about sizes, improve readability, >and avoid future warnings about writing beyond the end of h_dest. > >"pahole" shows no size nor member offset changes to struct vlan_ethhdr. >"objdump -d" shows no object code changes. > >Cc: Saeed Mahameed <saeedm@...dia.com> >Cc: Leon Romanovsky <leon@...nel.org> >Cc: "David S. Miller" <davem@...emloft.net> >Cc: Jakub Kicinski <kuba@...nel.org> >Cc: netdev@...r.kernel.org >Cc: linux-rdma@...r.kernel.org >Signed-off-by: Kees Cook <keescook@...omium.org> >--- >Since this results in no binary differences, I will carry this in my tree >unless someone else wants to pick it up. It's one of the last remaining >clean-ups needed for the next step in memcpy() hardening. >--- applied to net-next-mlx5 Thanks, Saeed.
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