linux-hardening - Re: [PATCH v2] firmware: coreboot: Check size of table entry and split memcpy

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Message-ID: <CAODwPW9SaomZjWQvR1mmV7OzvQkq-_XoDgSmK04fO5rVMGHmpw@mail.gmail.com>
Date:   Mon, 9 Jan 2023 16:02:26 +0100
From:   Julius Werner <jwerner@...omium.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Jack Rosenthal <jrosenth@...omium.org>,
        Paul Menzel <pmenzel@...gen.mpg.de>,
        Guenter Roeck <groeck@...omium.org>,
        Julius Werner <jwerner@...omium.org>,
        Brian Norris <briannorris@...omium.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2] firmware: coreboot: Check size of table entry and
 split memcpy

Reviewed-by: Julius Werner <jwerner@...omium.org>

> -               memcpy(&device->entry, ptr_entry, entry->size);
> +               memcpy(device->raw, entry, entry->size);

nit: It's a bit odd to change the source pointer from ptr_entry to
entry here. Technically the static analyzer would be within its rights
to give you a warning for that as well, because you're now
"overrunning" the source struct instead of the destination one.