linux-kernel - Re: [PATCH v7] crypto: x86: Regularize glue function prototypes

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Message-ID: <20191127180125.GA49214@sol.localdomain>
Date:   Wed, 27 Nov 2019 10:01:25 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        João Moreira <joao.moreira@...el.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Stephan Mueller <smueller@...onox.de>, x86@...nel.org,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH v7] crypto: x86: Regularize glue function prototypes

On Tue, Nov 26, 2019 at 10:08:02PM -0800, Kees Cook wrote:
> The crypto glue performed function prototype casting via macros to make
> indirect calls to assembly routines. Instead of performing casts at the
> call sites (which trips Control Flow Integrity prototype checking), switch
> each prototype to a common standard set of arguments which allows the
> removal of the existing macros. In order to keep pointer math unchanged,
> internal casting between u128 pointers and u8 pointers is added.
> 
> Co-developed-by: João Moreira <joao.moreira@...el.com>
> Signed-off-by: João Moreira <joao.moreira@...el.com>
> Signed-off-by: Kees Cook <keescook@...omium.org>

Reviewed-by: Eric Biggers <ebiggers@...nel.org>

- Eric