linux-kernel - Re: [PATCH][next] kexec_file: Use array

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Message-ID: <202006161130.EC036806@keescook>
Date:   Tue, 16 Jun 2020 11:30:56 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Eric Biederman <ebiederm@...ssion.com>, kexec@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: Re: [PATCH][next] kexec_file: Use array_size() helper in memcpy()

On Tue, Jun 16, 2020 at 01:20:41PM -0500, Gustavo A. R. Silva wrote:
> Use array_size() instead of the open-coded version in memcpy(). These
> sorts of multiplication factors need to be wrapped in array_size().
> 
> Also, while there, use the preferred form for passing a size of a struct.
> The alternative form where struct name is spelled out hurts readability
> and introduces an opportunity for a bug when the pointer variable type is
> changed but the corresponding sizeof that is passed as argument is not.
> 
> This issue was found with the help of Coccinelle and, audited and fixed
> manually.
> 
> Addresses-KSPP-ID: https://github.com/KSPP/linux/issues/83
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook