linux-hardening - Re: [PATCH] net/ncsi: Silence runtime memcpy() false positive warning

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Message-ID: <abd1a8e98d8b6d19520ae41d164ee905a40b3c42.camel@redhat.com>
Date:   Tue, 06 Dec 2022 11:36:54 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     Kees Cook <keescook@...omium.org>,
        Samuel Mendoza-Jonas <sam@...dozajonas.com>
Cc:     Joel Stanley <joel@....id.au>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] net/ncsi: Silence runtime memcpy() false positive
 warning

Hello,

On Fri, 2022-12-02 at 13:24 -0800, Kees Cook wrote:
> The memcpy() in ncsi_cmd_handler_oem deserializes nca->data into a
> flexible array structure that overlapping with non-flex-array members
> (mfr_id) intentionally. Since the mem_to_flex() API is not finished,
> temporarily silence this warning, since it is a false positive, using
> unsafe_memcpy().
> 
> Reported-by: Joel Stanley <joel@....id.au>
> Link: https://lore.kernel.org/netdev/CACPK8Xdfi=OJKP0x0D1w87fQeFZ4A2DP2qzGCRcuVbpU-9=4sQ@mail.gmail.com/
> Cc: Samuel Mendoza-Jonas <sam@...dozajonas.com>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Cc: Jakub Kicinski <kuba@...nel.org>
> Cc: Paolo Abeni <pabeni@...hat.com>
> Cc: netdev@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

Is this for the -net or the -net-next tree? It applies to both...

It you are targetting the -net tree, I think it would be nicer adding a
suitable Fixes tag.

Thanks!

Paolo