linux-kernel - Re: [PATCH 6/9] fortify: Split reporting and avoid passing string pointer

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Message-ID: <CANiq72=Awa4B1qL+Zdkuj1-EX+Tv=fK=pRM_DMdYCDmByEVOHg@mail.gmail.com>
Date:   Thu, 6 Apr 2023 15:44:54 +0200
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     linux-hardening@...r.kernel.org, Andy Shevchenko <andy@...nel.org>,
        Cezary Rojewski <cezary.rojewski@...el.com>,
        Puyou Lu <puyou.lu@...il.com>, Mark Brown <broonie@...nel.org>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Brendan Higgins <brendan.higgins@...ux.dev>,
        David Gow <davidgow@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Alexander Potapenko <glider@...gle.com>,
        Zhaoyang Huang <zhaoyang.huang@...soc.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Miguel Ojeda <ojeda@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Liam Howlett <liam.howlett@...cle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Dan Williams <dan.j.williams@...el.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Yury Norov <yury.norov@...il.com>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Sander Vanheule <sander@...nheule.net>,
        Eric Biggers <ebiggers@...gle.com>,
        "Masami Hiramatsu (Google)" <mhiramat@...nel.org>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Daniel Latypov <dlatypov@...gle.com>,
        José Expósito <jose.exposito89@...il.com>,
        linux-kernel@...r.kernel.org, kunit-dev@...glegroups.com
Subject: Re: [PATCH 6/9] fortify: Split reporting and avoid passing string pointer

On Thu, Apr 6, 2023 at 2:02 AM Kees Cook <keescook@...omium.org> wrote:
>
> +void __fortify_report(u8 reason);
> +void __fortify_panic(u8 reason) __cold __noreturn;

(snip)

> +void __fortify_report(u8 reason)

(snip)

> +void __fortify_panic(const u8 reason)

I am curious: for some reason (no pun intended :) the `reason`s above
are not `const` except this one, but then in a later patch they become
`const` (including the declarations).

So perhaps make everything `const` when they are introduced? Or is
there some other reason? (e.g. I saw one patch that moved a function,
so there it seemed to make sense to keep things as they are to make
the copy 1:1).

Cheers,
Miguel