linux-hardening - Re: [PATCH v2 25/63] compiler_types.h: Remove __compiletime_object

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Message-ID: <CANiq72mQQuwfpFdxeJQoKnfpUFSPuakHRm8RC+eH-xECBjwDkw@mail.gmail.com>
Date:   Wed, 18 Aug 2021 15:02:17 +0200
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Miguel Ojeda <ojeda@...nel.org>,
        Sedat Dilek <sedat.dilek@...il.com>,
        Will Deacon <will@...nel.org>, Marco Elver <elver@...gle.com>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Gabriel Krisman Bertazi <krisman@...labora.com>,
        Andy Lutomirski <luto@...nel.org>,
        Oleg Nesterov <oleg@...hat.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-wireless <linux-wireless@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-staging@...ts.linux.dev, linux-block@...r.kernel.org,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2 25/63] compiler_types.h: Remove __compiletime_object_size()

On Wed, Aug 18, 2021 at 8:14 AM Kees Cook <keescook@...omium.org> wrote:
>
> Since all compilers support __builtin_object_size(), and there is only
> one user of __compiletime_object_size, remove it to avoid the needless
> indirection. This lets Clang reason about check_copy_size() correctly.

Sounds good to me, the indirection is making things more complex than
they need to be.

Reviewed-by: Miguel Ojeda <ojeda@...nel.org>

Cheers,
Miguel