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Date: Thu, 12 May 2022 01:42:26 -0700 From: Saeed Mahameed <saeedm@...dia.com> To: Jakub Kicinski <kuba@...nel.org> Cc: Kees Cook <keescook@...omium.org>, Leon Romanovsky <leon@...nel.org>, Eric Dumazet <edumazet@...gle.com>, "David S. Miller" <davem@...emloft.net>, Paolo Abeni <pabeni@...hat.com>, Coco Li <lixiaoyan@...gle.com>, Tariq Toukan <tariqt@...dia.com>, netdev@...r.kernel.org, linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org Subject: Re: [PATCH] fortify: Provide a memcpy trap door for sharp corners On 11 May 09:24, Jakub Kicinski wrote: >On Tue, 10 May 2022 19:53:01 -0700 Kees Cook wrote: >> As we continue to narrow the scope of what the FORTIFY memcpy() will >> accept and build alternative APIs that give the compiler appropriate >> visibility into more complex memcpy scenarios, there is a need for >> "unfortified" memcpy use in rare cases where combinations of compiler >> behaviors, source code layout, etc, result in cases where the stricter >> memcpy checks need to be bypassed until appropriate solutions can be >> developed (i.e. fix compiler bugs, code refactoring, new API, etc). The >> intention is for this to be used only if there's no other reasonable >> solution, for its use to include a justification that can be used >> to assess future solutions, and for it to be temporary. >> >> Example usage included, based on analysis and discussion from: >> https://lore.kernel.org/netdev/CANn89iLS_2cshtuXPyNUGDPaic=sJiYfvTb_wNLgWrZRyBxZ_g@mail.gmail.com > >Saeed, ack for taking this in directly? Or do you prefer to take this >plus Eric's last BIG TCP patch via your tree? Please take both, I asked Eric a question on the BIG TCP patch, but I won't block the series. Thanks!
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